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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Database;

use Closure;
use CodeIgniter\Database\Exceptions\DatabaseException;
use CodeIgniter\Database\Exceptions\DataException;
use InvalidArgumentException;

/**
 * Class BaseBuilder
 *
 * Provides the core Query Builder methods.
 * Database-specific Builders might need to override
 * certain methods to make them work.
 */
class BaseBuilder
{
    /**
     * Reset DELETE data flag
     *
     * @var bool
     */
    protected $resetDeleteData = false;

    /**
     * QB SELECT data
     *
     * @var array
     */
    protected $QBSelect = [];

    /**
     * QB DISTINCT flag
     *
     * @var bool
     */
    protected $QBDistinct = false;

    /**
     * QB FROM data
     *
     * @var array
     */
    protected $QBFrom = [];

    /**
     * QB JOIN data
     *
     * @var array
     */
    protected $QBJoin = [];

    /**
     * QB WHERE data
     *
     * @var array
     */
    protected $QBWhere = [];

    /**
     * QB GROUP BY data
     *
     * @var array
     */
    public $QBGroupBy = [];

    /**
     * QB HAVING data
     *
     * @var array
     */
    protected $QBHaving = [];

    /**
     * QB keys
     *
     * @var array
     */
    protected $QBKeys = [];

    /**
     * QB LIMIT data
     *
     * @var bool|int
     */
    protected $QBLimit = false;

    /**
     * QB OFFSET data
     *
     * @var bool|int
     */
    protected $QBOffset = false;

    /**
     * QB ORDER BY data
     *
     * @var array|string|null
     */
    public $QBOrderBy = [];

    /**
     * QB NO ESCAPE data
     *
     * @var array
     */
    public $QBNoEscape = [];

    /**
     * QB data sets
     *
     * @var array
     */
    protected $QBSet = [];

    /**
     * QB WHERE group started flag
     *
     * @var bool
     */
    protected $QBWhereGroupStarted = false;

    /**
     * QB WHERE group count
     *
     * @var int
     */
    protected $QBWhereGroupCount = 0;

    /**
     * Ignore data that cause certain
     * exceptions, for example in case of
     * duplicate keys.
     *
     * @var bool
     */
    protected $QBIgnore = false;

    /**
     * A reference to the database connection.
     *
     * @var BaseConnection
     */
    protected $db;

    /**
     * Name of the primary table for this instance.
     * Tracked separately because $QBFrom gets escaped
     * and prefixed.
     *
     * @var string
     */
    protected $tableName;

    /**
     * ORDER BY random keyword
     *
     * @var array
     */
    protected $randomKeyword = [
        'RAND()',
        'RAND(%d)',
    ];

    /**
     * COUNT string
     *
     * @used-by CI_DB_driver::count_all()
     * @used-by BaseBuilder::count_all_results()
     *
     * @var string
     */
    protected $countString = 'SELECT COUNT(*) AS ';

    /**
     * Collects the named parameters and
     * their values for later binding
     * in the Query object.
     *
     * @var array
     */
    protected $binds = [];

    /**
     * Collects the key count for named parameters
     * in the Query object.
     *
     * @var array
     */
    protected $bindsKeyCount = [];

    /**
     * Some databases, like SQLite, do not by default
     * allow limiting of delete clauses.
     *
     * @var bool
     */
    protected $canLimitDeletes = true;

    /**
     * Some databases do not by default
     * allow limit update queries with WHERE.
     *
     * @var bool
     */
    protected $canLimitWhereUpdates = true;

    /**
     * Specifies which sql statements
     * support the ignore option.
     *
     * @var array
     */
    protected $supportedIgnoreStatements = [];

    /**
     * Builder testing mode status.
     *
     * @var bool
     */
    protected $testMode = false;

    /**
     * Tables relation types
     *
     * @var array
     */
    protected $joinTypes = [
        'LEFT',
        'RIGHT',
        'OUTER',
        'INNER',
        'LEFT OUTER',
        'RIGHT OUTER',
    ];

    /**
     * Strings that determine if a string represents a literal value or a field name
     *
     * @var string[]
     */
    protected $isLiteralStr = [];

    /**
     * RegExp used to get operators
     *
     * @var string[]
     */
    protected $pregOperators = [];

    /**
     * Constructor
     *
     * @param array|string $tableName
     *
     * @throws DatabaseException
     */
    public function __construct($tableName, ConnectionInterface &$db, ?array $options = null)
    {
        if (empty($tableName)) {
            throw new DatabaseException('A table must be specified when creating a new Query Builder.');
        }

        /**
         * @var BaseConnection $db
         */
        $this->db = $db;

        $this->tableName = $tableName;
        $this->from($tableName);

        if (! empty($options)) {
            foreach ($options as $key => $value) {
                if (property_exists($this, $key)) {
                    $this->{$key} = $value;
                }
            }
        }
    }

    /**
     * Returns the current database connection
     *
     * @return BaseConnection|ConnectionInterface
     */
    public function db(): ConnectionInterface
    {
        return $this->db;
    }

    /**
     * Sets a test mode status.
     *
     * @return $this
     */
    public function testMode(bool $mode = true)
    {
        $this->testMode = $mode;

        return $this;
    }

    /**
     * Gets the name of the primary table.
     */
    public function getTable(): string
    {
        return $this->tableName;
    }

    /**
     * Returns an array of bind values and their
     * named parameters for binding in the Query object later.
     */
    public function getBinds(): array
    {
        return $this->binds;
    }

    /**
     * Ignore
     *
     * Set ignore Flag for next insert,
     * update or delete query.
     *
     * @return $this
     */
    public function ignore(bool $ignore = true)
    {
        $this->QBIgnore = $ignore;

        return $this;
    }

    /**
     * Generates the SELECT portion of the query
     *
     * @param array|string $select
     *
     * @return $this
     */
    public function select($select = '*', ?bool $escape = null)
    {
        if (is_string($select)) {
            $select = explode(',', $select);
        }

        // If the escape value was not set, we will base it on the global setting
        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        foreach ($select as $val) {
            $val = trim($val);

            if ($val !== '') {
                $this->QBSelect[] = $val;

                /*
                 * When doing 'SELECT NULL as field_alias FROM table'
                 * null gets taken as a field, and therefore escaped
                 * with backticks.
                 * This prevents NULL being escaped
                 * @see https://github.com/codeigniter4/CodeIgniter4/issues/1169
                 */
                if (mb_stripos(trim($val), 'NULL') === 0) {
                    $escape = false;
                }

                $this->QBNoEscape[] = $escape;
            }
        }

        return $this;
    }

    /**
     * Generates a SELECT MAX(field) portion of a query
     *
     * @return $this
     */
    public function selectMax(string $select = '', string $alias = '')
    {
        return $this->maxMinAvgSum($select, $alias);
    }

    /**
     * Generates a SELECT MIN(field) portion of a query
     *
     * @return $this
     */
    public function selectMin(string $select = '', string $alias = '')
    {
        return $this->maxMinAvgSum($select, $alias, 'MIN');
    }

    /**
     * Generates a SELECT AVG(field) portion of a query
     *
     * @return $this
     */
    public function selectAvg(string $select = '', string $alias = '')
    {
        return $this->maxMinAvgSum($select, $alias, 'AVG');
    }

    /**
     * Generates a SELECT SUM(field) portion of a query
     *
     * @return $this
     */
    public function selectSum(string $select = '', string $alias = '')
    {
        return $this->maxMinAvgSum($select, $alias, 'SUM');
    }

    /**
     * Generates a SELECT COUNT(field) portion of a query
     *
     * @return $this
     */
    public function selectCount(string $select = '', string $alias = '')
    {
        return $this->maxMinAvgSum($select, $alias, 'COUNT');
    }

    /**
     * SELECT [MAX|MIN|AVG|SUM|COUNT]()
     *
     * @used-by selectMax()
     * @used-by selectMin()
     * @used-by selectAvg()
     * @used-by selectSum()
     *
     * @throws DatabaseException
     * @throws DataException
     *
     * @return $this
     */
    protected function maxMinAvgSum(string $select = '', string $alias = '', string $type = 'MAX')
    {
        if ($select === '') {
            throw DataException::forEmptyInputGiven('Select');
        }

        if (strpos($select, ',') !== false) {
            throw DataException::forInvalidArgument('column name not separated by comma');
        }

        $type = strtoupper($type);

        if (! in_array($type, ['MAX', 'MIN', 'AVG', 'SUM', 'COUNT'], true)) {
            throw new DatabaseException('Invalid function type: ' . $type);
        }

        if ($alias === '') {
            $alias = $this->createAliasFromTable(trim($select));
        }

        $sql = $type . '(' . $this->db->protectIdentifiers(trim($select)) . ') AS ' . $this->db->escapeIdentifiers(trim($alias));

        $this->QBSelect[]   = $sql;
        $this->QBNoEscape[] = null;

        return $this;
    }

    /**
     * Determines the alias name based on the table
     */
    protected function createAliasFromTable(string $item): string
    {
        if (strpos($item, '.') !== false) {
            $item = explode('.', $item);

            return end($item);
        }

        return $item;
    }

    /**
     * Sets a flag which tells the query string compiler to add DISTINCT
     *
     * @return $this
     */
    public function distinct(bool $val = true)
    {
        $this->QBDistinct = $val;

        return $this;
    }

    /**
     * Generates the FROM portion of the query
     *
     * @param array|string $from
     *
     * @return $this
     */
    public function from($from, bool $overwrite = false)
    {
        if ($overwrite === true) {
            $this->QBFrom = [];
            $this->db->setAliasedTables([]);
        }

        foreach ((array) $from as $val) {
            if (strpos($val, ',') !== false) {
                foreach (explode(',', $val) as $v) {
                    $v = trim($v);
                    $this->trackAliases($v);

                    $this->QBFrom[] = $this->db->protectIdentifiers($v, true, null, false);
                }
            } else {
                $val = trim($val);

                // Extract any aliases that might exist. We use this information
                // in the protectIdentifiers to know whether to add a table prefix
                $this->trackAliases($val);

                $this->QBFrom[] = $this->db->protectIdentifiers($val, true, null, false);
            }
        }

        return $this;
    }

    /**
     * Generates the JOIN portion of the query
     *
     * @return $this
     */
    public function join(string $table, string $cond, string $type = '', ?bool $escape = null)
    {
        if ($type !== '') {
            $type = strtoupper(trim($type));

            if (! in_array($type, $this->joinTypes, true)) {
                $type = '';
            } else {
                $type .= ' ';
            }
        }

        // Extract any aliases that might exist. We use this information
        // in the protectIdentifiers to know whether to add a table prefix
        $this->trackAliases($table);

        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        if (! $this->hasOperator($cond)) {
            $cond = ' USING (' . ($escape ? $this->db->escapeIdentifiers($cond) : $cond) . ')';
        } elseif ($escape === false) {
            $cond = ' ON ' . $cond;
        } else {
            // Split multiple conditions
            if (preg_match_all('/\sAND\s|\sOR\s/i', $cond, $joints, PREG_OFFSET_CAPTURE)) {
                $conditions = [];
                $joints     = $joints[0];
                array_unshift($joints, ['', 0]);

                for ($i = count($joints) - 1, $pos = strlen($cond); $i >= 0; $i--) {
                    $joints[$i][1] += strlen($joints[$i][0]); // offset
                    $conditions[$i] = substr($cond, $joints[$i][1], $pos - $joints[$i][1]);
                    $pos            = $joints[$i][1] - strlen($joints[$i][0]);
                    $joints[$i]     = $joints[$i][0];
                }
                ksort($conditions);
            } else {
                $conditions = [$cond];
                $joints     = [''];
            }

            $cond = ' ON ';

            foreach ($conditions as $i => $condition) {
                $operator = $this->getOperator($condition);

                $cond .= $joints[$i];
                $cond .= preg_match('/(\(*)?([\[\]\w\.\'-]+)' . preg_quote($operator, '/') . '(.*)/i', $condition, $match) ? $match[1] . $this->db->protectIdentifiers($match[2]) . $operator . $this->db->protectIdentifiers($match[3]) : $condition;
            }
        }

        // Do we want to escape the table name?
        if ($escape === true) {
            $table = $this->db->protectIdentifiers($table, true, null, false);
        }

        // Assemble the JOIN statement
        $this->QBJoin[] = $type . 'JOIN ' . $table . $cond;

        return $this;
    }

    /**
     * Generates the WHERE portion of the query.
     * Separates multiple calls with 'AND'.
     *
     * @param mixed $key
     * @param mixed $value
     *
     * @return $this
     */
    public function where($key, $value = null, ?bool $escape = null)
    {
        return $this->whereHaving('QBWhere', $key, $value, 'AND ', $escape);
    }

    /**
     * OR WHERE
     *
     * Generates the WHERE portion of the query.
     * Separates multiple calls with 'OR'.
     *
     * @param mixed $key
     * @param mixed $value
     * @param bool  $escape
     *
     * @return $this
     */
    public function orWhere($key, $value = null, ?bool $escape = null)
    {
        return $this->whereHaving('QBWhere', $key, $value, 'OR ', $escape);
    }

    /**
     * @used-by where()
     * @used-by orWhere()
     * @used-by having()
     * @used-by orHaving()
     *
     * @param mixed $key
     * @param mixed $value
     *
     * @return $this
     */
    protected function whereHaving(string $qbKey, $key, $value = null, string $type = 'AND ', ?bool $escape = null)
    {
        if (! is_array($key)) {
            $key = [$key => $value];
        }

        // If the escape value was not set will base it on the global setting
        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        foreach ($key as $k => $v) {
            $prefix = empty($this->{$qbKey}) ? $this->groupGetType('') : $this->groupGetType($type);

            if ($v !== null) {
                $op = $this->getOperator($k, true);

                if (! empty($op)) {
                    $k = trim($k);

                    end($op);

                    $op = trim(current($op));

                    if (substr($k, -1 * strlen($op)) === $op) {
                        $k = rtrim(strrev(preg_replace(strrev('/' . $op . '/'), strrev(''), strrev($k), 1)));
                    }
                }

                $bind = $this->setBind($k, $v, $escape);

                if (empty($op)) {
                    $k .= ' =';
                } else {
                    $k .= " {$op}";
                }

                if ($v instanceof Closure) {
                    $builder = $this->cleanClone();
                    $v       = '(' . str_replace("\n", ' ', $v($builder)->getCompiledSelect()) . ')';
                } else {
                    $v = " :{$bind}:";
                }
            } elseif (! $this->hasOperator($k) && $qbKey !== 'QBHaving') {
                // value appears not to have been set, assign the test to IS NULL
                $k .= ' IS NULL';
            } elseif (preg_match('/\s*(!?=|<>|IS(?:\s+NOT)?)\s*$/i', $k, $match, PREG_OFFSET_CAPTURE)) {
                $k = substr($k, 0, $match[0][1]) . ($match[1][0] === '=' ? ' IS NULL' : ' IS NOT NULL');
            }

            $this->{$qbKey}[] = [
                'condition' => $prefix . $k . $v,
                'escape'    => $escape,
            ];
        }

        return $this;
    }

    /**
     * Generates a WHERE field IN('item', 'item') SQL query,
     * joined with 'AND' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function whereIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, false, 'AND ', $escape);
    }

    /**
     * Generates a WHERE field IN('item', 'item') SQL query,
     * joined with 'OR' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function orWhereIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, false, 'OR ', $escape);
    }

    /**
     * Generates a WHERE field NOT IN('item', 'item') SQL query,
     * joined with 'AND' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function whereNotIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, true, 'AND ', $escape);
    }

    /**
     * Generates a WHERE field NOT IN('item', 'item') SQL query,
     * joined with 'OR' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function orWhereNotIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, true, 'OR ', $escape);
    }

    /**
     * Generates a HAVING field IN('item', 'item') SQL query,
     * joined with 'AND' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function havingIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, false, 'AND ', $escape, 'QBHaving');
    }

    /**
     * Generates a HAVING field IN('item', 'item') SQL query,
     * joined with 'OR' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function orHavingIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, false, 'OR ', $escape, 'QBHaving');
    }

    /**
     * Generates a HAVING field NOT IN('item', 'item') SQL query,
     * joined with 'AND' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function havingNotIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, true, 'AND ', $escape, 'QBHaving');
    }

    /**
     * Generates a HAVING field NOT IN('item', 'item') SQL query,
     * joined with 'OR' if appropriate.
     *
     * @param array|Closure|string $values The values searched on, or anonymous function with subquery
     *
     * @return $this
     */
    public function orHavingNotIn(?string $key = null, $values = null, ?bool $escape = null)
    {
        return $this->_whereIn($key, $values, true, 'OR ', $escape, 'QBHaving');
    }

    /**
     * @used-by WhereIn()
     * @used-by orWhereIn()
     * @used-by whereNotIn()
     * @used-by orWhereNotIn()
     *
     * @param array|Closure|null $values The values searched on, or anonymous function with subquery
     *
     * @throws InvalidArgumentException
     *
     * @return $this
     */
    protected function _whereIn(?string $key = null, $values = null, bool $not = false, string $type = 'AND ', ?bool $escape = null, string $clause = 'QBWhere')
    {
        if (empty($key) || ! is_string($key)) {
            if (CI_DEBUG) {
                throw new InvalidArgumentException(sprintf('%s() expects $key to be a non-empty string', debug_backtrace(0, 2)[1]['function']));
            }

            return $this; // @codeCoverageIgnore
        }

        if ($values === null || (! is_array($values) && ! ($values instanceof Closure))) {
            if (CI_DEBUG) {
                throw new InvalidArgumentException(sprintf('%s() expects $values to be of type array or closure', debug_backtrace(0, 2)[1]['function']));
            }

            return $this; // @codeCoverageIgnore
        }

        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        $ok = $key;

        if ($escape === true) {
            $key = $this->db->protectIdentifiers($key);
        }

        $not = ($not) ? ' NOT' : '';

        if ($values instanceof Closure) {
            $builder = $this->cleanClone();
            $ok      = str_replace("\n", ' ', $values($builder)->getCompiledSelect());
        } else {
            $whereIn = array_values($values);
            $ok      = $this->setBind($ok, $whereIn, $escape);
        }

        $prefix = empty($this->{$clause}) ? $this->groupGetType('') : $this->groupGetType($type);

        $whereIn = [
            'condition' => $prefix . $key . $not . ($values instanceof Closure ? " IN ({$ok})" : " IN :{$ok}:"),
            'escape'    => false,
        ];

        $this->{$clause}[] = $whereIn;

        return $this;
    }

    /**
     * Generates a %LIKE% portion of the query.
     * Separates multiple calls with 'AND'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function like($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'AND ', $side, '', $escape, $insensitiveSearch);
    }

    /**
     * Generates a NOT LIKE portion of the query.
     * Separates multiple calls with 'AND'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function notLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'AND ', $side, 'NOT', $escape, $insensitiveSearch);
    }

    /**
     * Generates a %LIKE% portion of the query.
     * Separates multiple calls with 'OR'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function orLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'OR ', $side, '', $escape, $insensitiveSearch);
    }

    /**
     * Generates a NOT LIKE portion of the query.
     * Separates multiple calls with 'OR'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function orNotLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'OR ', $side, 'NOT', $escape, $insensitiveSearch);
    }

    /**
     * Generates a %LIKE% portion of the query.
     * Separates multiple calls with 'AND'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function havingLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'AND ', $side, '', $escape, $insensitiveSearch, 'QBHaving');
    }

    /**
     * Generates a NOT LIKE portion of the query.
     * Separates multiple calls with 'AND'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function notHavingLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'AND ', $side, 'NOT', $escape, $insensitiveSearch, 'QBHaving');
    }

    /**
     * Generates a %LIKE% portion of the query.
     * Separates multiple calls with 'OR'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function orHavingLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'OR ', $side, '', $escape, $insensitiveSearch, 'QBHaving');
    }

    /**
     * Generates a NOT LIKE portion of the query.
     * Separates multiple calls with 'OR'.
     *
     * @param mixed $field
     *
     * @return $this
     */
    public function orNotHavingLike($field, string $match = '', string $side = 'both', ?bool $escape = null, bool $insensitiveSearch = false)
    {
        return $this->_like($field, $match, 'OR ', $side, 'NOT', $escape, $insensitiveSearch, 'QBHaving');
    }

    /**
     * @used-by like()
     * @used-by orLike()
     * @used-by notLike()
     * @used-by orNotLike()
     * @used-by havingLike()
     * @used-by orHavingLike()
     * @used-by notHavingLike()
     * @used-by orNotHavingLike()
     *
     * @param mixed $field
     *
     * @return $this
     */
    protected function _like($field, string $match = '', string $type = 'AND ', string $side = 'both', string $not = '', ?bool $escape = null, bool $insensitiveSearch = false, string $clause = 'QBWhere')
    {
        if (! is_array($field)) {
            $field = [$field => $match];
        }

        $escape = is_bool($escape) ? $escape : $this->db->protectIdentifiers;
        $side   = strtolower($side);

        foreach ($field as $k => $v) {
            if ($insensitiveSearch === true) {
                $v = strtolower($v);
            }

            $prefix = empty($this->{$clause}) ? $this->groupGetType('') : $this->groupGetType($type);

            if ($side === 'none') {
                $bind = $this->setBind($k, $v, $escape);
            } elseif ($side === 'before') {
                $bind = $this->setBind($k, "%{$v}", $escape);
            } elseif ($side === 'after') {
                $bind = $this->setBind($k, "{$v}%", $escape);
            } else {
                $bind = $this->setBind($k, "%{$v}%", $escape);
            }

            $likeStatement = $this->_like_statement($prefix, $this->db->protectIdentifiers($k, false, $escape), $not, $bind, $insensitiveSearch);

            // some platforms require an escape sequence definition for LIKE wildcards
            if ($escape === true && $this->db->likeEscapeStr !== '') {
                $likeStatement .= sprintf($this->db->likeEscapeStr, $this->db->likeEscapeChar);
            }

            $this->{$clause}[] = [
                'condition' => $likeStatement,
                'escape'    => $escape,
            ];
        }

        return $this;
    }

    /**
     * Platform independent LIKE statement builder.
     */
    protected function _like_statement(?string $prefix, string $column, ?string $not, string $bind, bool $insensitiveSearch = false): string
    {
        if ($insensitiveSearch === true) {
            return "{$prefix} LOWER({$column}) {$not} LIKE :{$bind}:";
        }

        return "{$prefix} {$column} {$not} LIKE :{$bind}:";
    }

    /**
     * Starts a query group.
     *
     * @return $this
     */
    public function groupStart()
    {
        return $this->groupStartPrepare();
    }

    /**
     * Starts a query group, but ORs the group
     *
     * @return $this
     */
    public function orGroupStart()
    {
        return $this->groupStartPrepare('', 'OR ');
    }

    /**
     * Starts a query group, but NOTs the group
     *
     * @return $this
     */
    public function notGroupStart()
    {
        return $this->groupStartPrepare('NOT ');
    }

    /**
     * Starts a query group, but OR NOTs the group
     *
     * @return $this
     */
    public function orNotGroupStart()
    {
        return $this->groupStartPrepare('NOT ', 'OR ');
    }

    /**
     * Ends a query group
     *
     * @return $this
     */
    public function groupEnd()
    {
        return $this->groupEndPrepare();
    }

    /**
     * Starts a query group for HAVING clause.
     *
     * @return $this
     */
    public function havingGroupStart()
    {
        return $this->groupStartPrepare('', 'AND ', 'QBHaving');
    }

    /**
     * Starts a query group for HAVING clause, but ORs the group.
     *
     * @return $this
     */
    public function orHavingGroupStart()
    {
        return $this->groupStartPrepare('', 'OR ', 'QBHaving');
    }

    /**
     * Starts a query group for HAVING clause, but NOTs the group.
     *
     * @return $this
     */
    public function notHavingGroupStart()
    {
        return $this->groupStartPrepare('NOT ', 'AND ', 'QBHaving');
    }

    /**
     * Starts a query group for HAVING clause, but OR NOTs the group.
     *
     * @return $this
     */
    public function orNotHavingGroupStart()
    {
        return $this->groupStartPrepare('NOT ', 'OR ', 'QBHaving');
    }

    /**
     * Ends a query group for HAVING clause.
     *
     * @return $this
     */
    public function havingGroupEnd()
    {
        return $this->groupEndPrepare('QBHaving');
    }

    /**
     * Prepate a query group start.
     *
     * @return $this
     */
    protected function groupStartPrepare(string $not = '', string $type = 'AND ', string $clause = 'QBWhere')
    {
        $type = $this->groupGetType($type);

        $this->QBWhereGroupStarted = true;
        $prefix                    = empty($this->{$clause}) ? '' : $type;
        $where                     = [
            'condition' => $prefix . $not . str_repeat(' ', ++$this->QBWhereGroupCount) . ' (',
            'escape'    => false,
        ];

        $this->{$clause}[] = $where;

        return $this;
    }

    /**
     * Prepate a query group end.
     *
     * @return $this
     */
    protected function groupEndPrepare(string $clause = 'QBWhere')
    {
        $this->QBWhereGroupStarted = false;
        $where                     = [
            'condition' => str_repeat(' ', $this->QBWhereGroupCount--) . ')',
            'escape'    => false,
        ];

        $this->{$clause}[] = $where;

        return $this;
    }

    /**
     * @used-by groupStart()
     * @used-by _like()
     * @used-by whereHaving()
     * @used-by _whereIn()
     * @used-by havingGroupStart()
     */
    protected function groupGetType(string $type): string
    {
        if ($this->QBWhereGroupStarted) {
            $type                      = '';
            $this->QBWhereGroupStarted = false;
        }

        return $type;
    }

    /**
     * @param array|string $by
     *
     * @return $this
     */
    public function groupBy($by, ?bool $escape = null)
    {
        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        if (is_string($by)) {
            $by = ($escape === true) ? explode(',', $by) : [$by];
        }

        foreach ($by as $val) {
            $val = trim($val);

            if ($val !== '') {
                $val = [
                    'field'  => $val,
                    'escape' => $escape,
                ];

                $this->QBGroupBy[] = $val;
            }
        }

        return $this;
    }

    /**
     * Separates multiple calls with 'AND'.
     *
     * @param array|string $key
     * @param mixed        $value
     *
     * @return $this
     */
    public function having($key, $value = null, ?bool $escape = null)
    {
        return $this->whereHaving('QBHaving', $key, $value, 'AND ', $escape);
    }

    /**
     * Separates multiple calls with 'OR'.
     *
     * @param array|string $key
     * @param mixed        $value
     *
     * @return $this
     */
    public function orHaving($key, $value = null, ?bool $escape = null)
    {
        return $this->whereHaving('QBHaving', $key, $value, 'OR ', $escape);
    }

    /**
     * @param string $direction ASC, DESC or RANDOM
     *
     * @return $this
     */
    public function orderBy(string $orderBy, string $direction = '', ?bool $escape = null)
    {
        if (empty($orderBy)) {
            return $this;
        }

        $direction = strtoupper(trim($direction));

        if ($direction === 'RANDOM') {
            $direction = '';
            $orderBy   = ctype_digit($orderBy) ? sprintf($this->randomKeyword[1], $orderBy) : $this->randomKeyword[0];
            $escape    = false;
        } elseif ($direction !== '') {
            $direction = in_array($direction, ['ASC', 'DESC'], true) ? ' ' . $direction : '';
        }

        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        if ($escape === false) {
            $qbOrderBy[] = [
                'field'     => $orderBy,
                'direction' => $direction,
                'escape'    => false,
            ];
        } else {
            $qbOrderBy = [];

            foreach (explode(',', $orderBy) as $field) {
                $qbOrderBy[] = ($direction === '' && preg_match('/\s+(ASC|DESC)$/i', rtrim($field), $match, PREG_OFFSET_CAPTURE))
                    ? [
                        'field'     => ltrim(substr($field, 0, $match[0][1])),
                        'direction' => ' ' . $match[1][0],
                        'escape'    => true,
                    ]
                    : [
                        'field'     => trim($field),
                        'direction' => $direction,
                        'escape'    => true,
                    ];
            }
        }

        $this->QBOrderBy = array_merge($this->QBOrderBy, $qbOrderBy);

        return $this;
    }

    /**
     * @return $this
     */
    public function limit(?int $value = null, ?int $offset = 0)
    {
        if ($value !== null) {
            $this->QBLimit = $value;
        }

        if (! empty($offset)) {
            $this->QBOffset = $offset;
        }

        return $this;
    }

    /**
     * Sets the OFFSET value
     *
     * @return $this
     */
    public function offset(int $offset)
    {
        if (! empty($offset)) {
            $this->QBOffset = (int) $offset;
        }

        return $this;
    }

    /**
     * Generates a platform-specific LIMIT clause.
     */
    protected function _limit(string $sql, bool $offsetIgnore = false): string
    {
        return $sql . ' LIMIT ' . ($offsetIgnore === false && $this->QBOffset ? $this->QBOffset . ', ' : '') . $this->QBLimit;
    }

    /**
     * Allows key/value pairs to be set for insert(), update() or replace().
     *
     * @param array|object|string $key    Field name, or an array of field/value pairs
     * @param mixed               $value  Field value, if $key is a single field
     * @param bool|null           $escape Whether to escape values
     *
     * @return $this
     */
    public function set($key, $value = '', ?bool $escape = null)
    {
        $key = $this->objectToArray($key);

        if (! is_array($key)) {
            $key = [$key => $value];
        }

        $escape = is_bool($escape) ? $escape : $this->db->protectIdentifiers;

        foreach ($key as $k => $v) {
            if ($escape) {
                $bind = $this->setBind($k, $v, $escape);

                $this->QBSet[$this->db->protectIdentifiers($k, false)] = ":{$bind}:";
            } else {
                $this->QBSet[$this->db->protectIdentifiers($k, false)] = $v;
            }
        }

        return $this;
    }

    /**
     * Returns the previously set() data, alternatively resetting it if needed.
     */
    public function getSetData(bool $clean = false): array
    {
        $data = $this->QBSet;

        if ($clean) {
            $this->QBSet = [];
        }

        return $data;
    }

    /**
     * Compiles a SELECT query string and returns the sql.
     */
    public function getCompiledSelect(bool $reset = true): string
    {
        $select = $this->compileSelect();

        if ($reset === true) {
            $this->resetSelect();
        }

        return $this->compileFinalQuery($select);
    }

    /**
     * Returns a finalized, compiled query string with the bindings
     * inserted and prefixes swapped out.
     */
    protected function compileFinalQuery(string $sql): string
    {
        $query = new Query($this->db);
        $query->setQuery($sql, $this->binds, false);

        if (! empty($this->db->swapPre) && ! empty($this->db->DBPrefix)) {
            $query->swapPrefix($this->db->DBPrefix, $this->db->swapPre);
        }

        return $query->getQuery();
    }

    /**
     * Compiles the select statement based on the other functions called
     * and runs the query
     *
     * @return false|ResultInterface
     */
    public function get(?int $limit = null, int $offset = 0, bool $reset = true)
    {
        if ($limit !== null) {
            $this->limit($limit, $offset);
        }

        $result = $this->testMode
            ? $this->getCompiledSelect($reset)
            : $this->db->query($this->compileSelect(), $this->binds, false);

        if ($reset === true) {
            $this->resetSelect();

            // Clear our binds so we don't eat up memory
            $this->binds = [];
        }

        return $result;
    }

    /**
     * Generates a platform-specific query string that counts all records in
     * the particular table
     *
     * @return int|string
     */
    public function countAll(bool $reset = true)
    {
        $table = $this->QBFrom[0];

        $sql = $this->countString . $this->db->escapeIdentifiers('numrows') . ' FROM ' .
            $this->db->protectIdentifiers($table, true, null, false);

        if ($this->testMode) {
            return $sql;
        }

        $query = $this->db->query($sql, null, false);

        if (empty($query->getResult())) {
            return 0;
        }

        $query = $query->getRow();

        if ($reset === true) {
            $this->resetSelect();
        }

        return (int) $query->numrows;
    }

    /**
     * Generates a platform-specific query string that counts all records
     * returned by an Query Builder query.
     *
     * @return int|string
     */
    public function countAllResults(bool $reset = true)
    {
        // ORDER BY usage is often problematic here (most notably
        // on Microsoft SQL Server) and ultimately unnecessary
        // for selecting COUNT(*) ...
        $orderBy = [];

        if (! empty($this->QBOrderBy)) {
            $orderBy = $this->QBOrderBy;

            $this->QBOrderBy = null;
        }

        // We cannot use a LIMIT when getting the single row COUNT(*) result
        $limit = $this->QBLimit;

        $this->QBLimit = false;

        if ($this->QBDistinct === true || ! empty($this->QBGroupBy)) {
            // We need to backup the original SELECT in case DBPrefix is used
            $select = $this->QBSelect;
            $sql    = $this->countString . $this->db->protectIdentifiers('numrows') . "\nFROM (\n" . $this->compileSelect() . "\n) CI_count_all_results";

            // Restore SELECT part
            $this->QBSelect = $select;
            unset($select);
        } else {
            $sql = $this->compileSelect($this->countString . $this->db->protectIdentifiers('numrows'));
        }

        if ($this->testMode) {
            return $sql;
        }

        $result = $this->db->query($sql, $this->binds, false);

        if ($reset === true) {
            $this->resetSelect();
        } elseif (! isset($this->QBOrderBy)) {
            $this->QBOrderBy = $orderBy;
        }

        // Restore the LIMIT setting
        $this->QBLimit = $limit;

        $row = ! $result instanceof ResultInterface ? null : $result->getRow();

        if (empty($row)) {
            return 0;
        }

        return (int) $row->numrows;
    }

    /**
     * Compiles the set conditions and returns the sql statement
     *
     * @return array
     */
    public function getCompiledQBWhere()
    {
        return $this->QBWhere;
    }

    /**
     * Allows the where clause, limit and offset to be added directly
     *
     * @param array|string $where
     *
     * @return ResultInterface
     */
    public function getWhere($where = null, ?int $limit = null, ?int $offset = 0, bool $reset = true)
    {
        if ($where !== null) {
            $this->where($where);
        }

        if (! empty($limit)) {
            $this->limit($limit, $offset);
        }

        $result = $this->testMode
            ? $this->getCompiledSelect($reset)
            : $this->db->query($this->compileSelect(), $this->binds, false);

        if ($reset === true) {
            $this->resetSelect();

            // Clear our binds so we don't eat up memory
            $this->binds = [];
        }

        return $result;
    }

    /**
     * Compiles batch insert strings and runs the queries
     *
     * @throws DatabaseException
     *
     * @return false|int|string[] Number of rows inserted or FALSE on failure, SQL array when testMode
     */
    public function insertBatch(?array $set = null, ?bool $escape = null, int $batchSize = 100)
    {
        if ($set === null) {
            if (empty($this->QBSet)) {
                if (CI_DEBUG) {
                    throw new DatabaseException('You must use the "set" method to update an entry.');
                }

                return false; // @codeCoverageIgnore
            }
        } elseif (empty($set)) {
            if (CI_DEBUG) {
                throw new DatabaseException('insertBatch() called with no data');
            }

            return false; // @codeCoverageIgnore
        }

        $hasQBSet = $set === null;

        $table = $this->QBFrom[0];

        $affectedRows = 0;
        $savedSQL     = [];

        if ($hasQBSet) {
            $set = $this->QBSet;
        }

        for ($i = 0, $total = count($set); $i < $total; $i += $batchSize) {
            if ($hasQBSet) {
                $QBSet = array_slice($this->QBSet, $i, $batchSize);
            } else {
                $this->setInsertBatch(array_slice($set, $i, $batchSize), '', $escape);
                $QBSet = $this->QBSet;
            }
            $sql = $this->_insertBatch($this->db->protectIdentifiers($table, true, null, false), $this->QBKeys, $QBSet);

            if ($this->testMode) {
                $savedSQL[] = $sql;
            } else {
                $this->db->query($sql, null, false);
                $affectedRows += $this->db->affectedRows();
            }

            if (! $hasQBSet) {
                $this->resetWrite();
            }
        }

        $this->resetWrite();

        return $this->testMode ? $savedSQL : $affectedRows;
    }

    /**
     * Generates a platform-specific insert string from the supplied data.
     */
    protected function _insertBatch(string $table, array $keys, array $values): string
    {
        return 'INSERT ' . $this->compileIgnore('insert') . 'INTO ' . $table . ' (' . implode(', ', $keys) . ') VALUES ' . implode(', ', $values);
    }

    /**
     * Allows key/value pairs to be set for batch inserts
     *
     * @param mixed $key
     *
     * @return $this|null
     */
    public function setInsertBatch($key, string $value = '', ?bool $escape = null)
    {
        $key = $this->batchObjectToArray($key);

        if (! is_array($key)) {
            $key = [$key => $value];
        }

        $escape = is_bool($escape) ? $escape : $this->db->protectIdentifiers;

        $keys = array_keys($this->objectToArray(current($key)));
        sort($keys);

        foreach ($key as $row) {
            $row = $this->objectToArray($row);
            if (array_diff($keys, array_keys($row)) !== [] || array_diff(array_keys($row), $keys) !== []) {
                // batch function above returns an error on an empty array
                $this->QBSet[] = [];

                return null;
            }

            ksort($row); // puts $row in the same order as our keys

            $clean = [];

            foreach ($row as $rowValue) {
                $clean[] = $escape ? $this->db->escape($rowValue) : $rowValue;
            }

            $row = $clean;

            $this->QBSet[] = '(' . implode(',', $row) . ')';
        }

        foreach ($keys as $k) {
            $this->QBKeys[] = $this->db->protectIdentifiers($k, false);
        }

        return $this;
    }

    /**
     * Compiles an insert query and returns the sql
     *
     * @throws DatabaseException
     *
     * @return bool|string
     */
    public function getCompiledInsert(bool $reset = true)
    {
        if ($this->validateInsert() === false) {
            return false;
        }

        $sql = $this->_insert(
            $this->db->protectIdentifiers($this->QBFrom[0], true, null, false),
            array_keys($this->QBSet),
            array_values($this->QBSet)
        );

        if ($reset === true) {
            $this->resetWrite();
        }

        return $this->compileFinalQuery($sql);
    }

    /**
     * Compiles an insert string and runs the query
     *
     * @throws DatabaseException
     *
     * @return bool|Query
     */
    public function insert(?array $set = null, ?bool $escape = null)
    {
        if ($set !== null) {
            $this->set($set, '', $escape);
        }

        if ($this->validateInsert() === false) {
            return false;
        }

        $sql = $this->_insert(
            $this->db->protectIdentifiers($this->QBFrom[0], true, $escape, false),
            array_keys($this->QBSet),
            array_values($this->QBSet)
        );

        if (! $this->testMode) {
            $this->resetWrite();

            $result = $this->db->query($sql, $this->binds, false);

            // Clear our binds so we don't eat up memory
            $this->binds = [];

            return $result;
        }

        return false;
    }

    /**
     * This method is used by both insert() and getCompiledInsert() to
     * validate that the there data is actually being set and that table
     * has been chosen to be inserted into.
     *
     * @throws DatabaseException
     */
    protected function validateInsert(): bool
    {
        if (empty($this->QBSet)) {
            if (CI_DEBUG) {
                throw new DatabaseException('You must use the "set" method to update an entry.');
            }

            return false; // @codeCoverageIgnore
        }

        return true;
    }

    /**
     * Generates a platform-specific insert string from the supplied data
     */
    protected function _insert(string $table, array $keys, array $unescapedKeys): string
    {
        return 'INSERT ' . $this->compileIgnore('insert') . 'INTO ' . $table . ' (' . implode(', ', $keys) . ') VALUES (' . implode(', ', $unescapedKeys) . ')';
    }

    /**
     * Compiles an replace into string and runs the query
     *
     * @throws DatabaseException
     *
     * @return BaseResult|false|Query|string
     */
    public function replace(?array $set = null)
    {
        if ($set !== null) {
            $this->set($set);
        }

        if (empty($this->QBSet)) {
            if (CI_DEBUG) {
                throw new DatabaseException('You must use the "set" method to update an entry.');
            }

            return false; // @codeCoverageIgnore
        }

        $table = $this->QBFrom[0];

        $sql = $this->_replace($table, array_keys($this->QBSet), array_values($this->QBSet));

        $this->resetWrite();

        return $this->testMode ? $sql : $this->db->query($sql, $this->binds, false);
    }

    /**
     * Generates a platform-specific replace string from the supplied data
     */
    protected function _replace(string $table, array $keys, array $values): string
    {
        return 'REPLACE INTO ' . $table . ' (' . implode(', ', $keys) . ') VALUES (' . implode(', ', $values) . ')';
    }

    /**
     * Groups tables in FROM clauses if needed, so there is no confusion
     * about operator precedence.
     *
     * Note: This is only used (and overridden) by MySQL and SQLSRV.
     */
    protected function _fromTables(): string
    {
        return implode(', ', $this->QBFrom);
    }

    /**
     * Compiles an update query and returns the sql
     *
     * @return bool|string
     */
    public function getCompiledUpdate(bool $reset = true)
    {
        if ($this->validateUpdate() === false) {
            return false;
        }

        $sql = $this->_update($this->QBFrom[0], $this->QBSet);

        if ($reset === true) {
            $this->resetWrite();
        }

        return $this->compileFinalQuery($sql);
    }

    /**
     * Compiles an update string and runs the query.
     *
     * @param mixed $where
     *
     * @throws DatabaseException
     */
    public function update(?array $set = null, $where = null, ?int $limit = null): bool
    {
        if ($set !== null) {
            $this->set($set);
        }

        if ($this->validateUpdate() === false) {
            return false;
        }

        if ($where !== null) {
            $this->where($where);
        }

        if (! empty($limit)) {
            if (! $this->canLimitWhereUpdates) {
                throw new DatabaseException('This driver does not allow LIMITs on UPDATE queries using WHERE.');
            }

            $this->limit($limit);
        }

        $sql = $this->_update($this->QBFrom[0], $this->QBSet);

        if (! $this->testMode) {
            $this->resetWrite();

            $result = $this->db->query($sql, $this->binds, false);

            if ($result !== false) {
                // Clear our binds so we don't eat up memory
                $this->binds = [];

                return true;
            }

            return false;
        }

        return true;
    }

    /**
     * Generates a platform-specific update string from the supplied data
     */
    protected function _update(string $table, array $values): string
    {
        $valStr = [];

        foreach ($values as $key => $val) {
            $valStr[] = $key . ' = ' . $val;
        }

        return 'UPDATE ' . $this->compileIgnore('update') . $table . ' SET ' . implode(', ', $valStr)
            . $this->compileWhereHaving('QBWhere')
            . $this->compileOrderBy()
            . ($this->QBLimit ? $this->_limit(' ', true) : '');
    }

    /**
     * This method is used by both update() and getCompiledUpdate() to
     * validate that data is actually being set and that a table has been
     * chosen to be update.
     *
     * @throws DatabaseException
     */
    protected function validateUpdate(): bool
    {
        if (empty($this->QBSet)) {
            if (CI_DEBUG) {
                throw new DatabaseException('You must use the "set" method to update an entry.');
            }

            return false; // @codeCoverageIgnore
        }

        return true;
    }

    /**
     * Compiles an update string and runs the query
     *
     * @throws DatabaseException
     *
     * @return false|int|string[] Number of rows affected or FALSE on failure, SQL array when testMode
     */
    public function updateBatch(?array $set = null, ?string $index = null, int $batchSize = 100)
    {
        if ($index === null) {
            if (CI_DEBUG) {
                throw new DatabaseException('You must specify an index to match on for batch updates.');
            }

            return false; // @codeCoverageIgnore
        }

        if ($set === null) {
            if (empty($this->QBSet)) {
                if (CI_DEBUG) {
                    throw new DatabaseException('You must use the "set" method to update an entry.');
                }

                return false; // @codeCoverageIgnore
            }
        } elseif (empty($set)) {
            if (CI_DEBUG) {
                throw new DatabaseException('updateBatch() called with no data');
            }

            return false; // @codeCoverageIgnore
        }

        $hasQBSet = $set === null;

        $table = $this->QBFrom[0];

        $affectedRows = 0;
        $savedSQL     = [];
        $savedQBWhere = $this->QBWhere;

        if ($hasQBSet) {
            $set = $this->QBSet;
        }

        for ($i = 0, $total = count($set); $i < $total; $i += $batchSize) {
            if ($hasQBSet) {
                $QBSet = array_slice($this->QBSet, $i, $batchSize);
            } else {
                $this->setUpdateBatch(array_slice($set, $i, $batchSize), $index);
                $QBSet = $this->QBSet;
            }

            $sql = $this->_updateBatch(
                $table,
                $QBSet,
                $this->db->protectIdentifiers($index)
            );

            if ($this->testMode) {
                $savedSQL[] = $sql;
            } else {
                $this->db->query($sql, $this->binds, false);
                $affectedRows += $this->db->affectedRows();
            }

            if (! $hasQBSet) {
                $this->resetWrite();
            }

            $this->QBWhere = $savedQBWhere;
        }

        $this->resetWrite();

        return $this->testMode ? $savedSQL : $affectedRows;
    }

    /**
     * Generates a platform-specific batch update string from the supplied data
     */
    protected function _updateBatch(string $table, array $values, string $index): string
    {
        $ids   = [];
        $final = [];

        foreach ($values as $val) {
            $ids[] = $val[$index];

            foreach (array_keys($val) as $field) {
                if ($field !== $index) {
                    $final[$field][] = 'WHEN ' . $index . ' = ' . $val[$index] . ' THEN ' . $val[$field];
                }
            }
        }

        $cases = '';

        foreach ($final as $k => $v) {
            $cases .= $k . " = CASE \n"
                . implode("\n", $v) . "\n"
                . 'ELSE ' . $k . ' END, ';
        }

        $this->where($index . ' IN(' . implode(',', $ids) . ')', null, false);

        return 'UPDATE ' . $this->compileIgnore('update') . $table . ' SET ' . substr($cases, 0, -2) . $this->compileWhereHaving('QBWhere');
    }

    /**
     * Allows key/value pairs to be set for batch updating
     *
     * @param array|object $key
     *
     * @throws DatabaseException
     *
     * @return $this|null
     */
    public function setUpdateBatch($key, string $index = '', ?bool $escape = null)
    {
        $key = $this->batchObjectToArray($key);

        if (! is_array($key)) {
            return null;
        }

        if (! is_bool($escape)) {
            $escape = $this->db->protectIdentifiers;
        }

        foreach ($key as $v) {
            $indexSet = false;
            $clean    = [];

            foreach ($v as $k2 => $v2) {
                if ($k2 === $index) {
                    $indexSet = true;
                }

                $clean[$this->db->protectIdentifiers($k2, false)]
                    = $escape ? $this->db->escape($v2) : $v2;
            }

            if ($indexSet === false) {
                throw new DatabaseException('One or more rows submitted for batch updating is missing the specified index.');
            }

            $this->QBSet[] = $clean;
        }

        return $this;
    }

    /**
     * Compiles a delete string and runs "DELETE FROM table"
     *
     * @return bool|string TRUE on success, FALSE on failure, string on testMode
     */
    public function emptyTable()
    {
        $table = $this->QBFrom[0];

        $sql = $this->_delete($table);

        if ($this->testMode) {
            return $sql;
        }

        $this->resetWrite();

        return $this->db->query($sql, null, false);
    }

    /**
     * Compiles a truncate string and runs the query
     * If the database does not support the truncate() command
     * This function maps to "DELETE FROM table"
     *
     * @return bool|string TRUE on success, FALSE on failure, string on testMode
     */
    public function truncate()
    {
        $table = $this->QBFrom[0];

        $sql = $this->_truncate($table);

        if ($this->testMode) {
            return $sql;
        }

        $this->resetWrite();

        return $this->db->query($sql, null, false);
    }

    /**
     * Generates a platform-specific truncate string from the supplied data
     *
     * If the database does not support the truncate() command,
     * then this method maps to 'DELETE FROM table'
     */
    protected function _truncate(string $table): string
    {
        return 'TRUNCATE ' . $table;
    }

    /**
     * Compiles a delete query string and returns the sql
     */
    public function getCompiledDelete(bool $reset = true): string
    {
        $sql = $this->testMode()->delete('', null, $reset);
        $this->testMode(false);

        return $this->compileFinalQuery($sql);
    }

    /**
     * Compiles a delete string and runs the query
     *
     * @param mixed $where
     *
     * @throws DatabaseException
     *
     * @return bool|string
     */
    public function delete($where = '', ?int $limit = null, bool $resetData = true)
    {
        $table = $this->db->protectIdentifiers($this->QBFrom[0], true, null, false);

        if ($where !== '') {
            $this->where($where);
        }

        if (empty($this->QBWhere)) {
            if (CI_DEBUG) {
                throw new DatabaseException('Deletes are not allowed unless they contain a "where" or "like" clause.');
            }

            return false; // @codeCoverageIgnore
        }

        $sql = $this->_delete($table);

        if (! empty($limit)) {
            $this->QBLimit = $limit;
        }

        if (! empty($this->QBLimit)) {
            if (! $this->canLimitDeletes) {
                throw new DatabaseException('SQLite3 does not allow LIMITs on DELETE queries.');
            }

            $sql = $this->_limit($sql, true);
        }

        if ($resetData) {
            $this->resetWrite();
        }

        return $this->testMode ? $sql : $this->db->query($sql, $this->binds, false);
    }

    /**
     * Increments a numeric column by the specified value.
     *
     * @return bool
     */
    public function increment(string $column, int $value = 1)
    {
        $column = $this->db->protectIdentifiers($column);

        $sql = $this->_update($this->QBFrom[0], [$column => "{$column} + {$value}"]);

        return $this->db->query($sql, $this->binds, false);
    }

    /**
     * Decrements a numeric column by the specified value.
     *
     * @return bool
     */
    public function decrement(string $column, int $value = 1)
    {
        $column = $this->db->protectIdentifiers($column);

        $sql = $this->_update($this->QBFrom[0], [$column => "{$column}-{$value}"]);

        return $this->db->query($sql, $this->binds, false);
    }

    /**
     * Generates a platform-specific delete string from the supplied data
     */
    protected function _delete(string $table): string
    {
        return 'DELETE ' . $this->compileIgnore('delete') . 'FROM ' . $table . $this->compileWhereHaving('QBWhere');
    }

    /**
     * Used to track SQL statements written with aliased tables.
     *
     * @param array|string $table The table to inspect
     *
     * @return string|void
     */
    protected function trackAliases($table)
    {
        if (is_array($table)) {
            foreach ($table as $t) {
                $this->trackAliases($t);
            }

            return;
        }

        // Does the string contain a comma?  If so, we need to separate
        // the string into discreet statements
        if (strpos($table, ',') !== false) {
            return $this->trackAliases(explode(',', $table));
        }

        // if a table alias is used we can recognize it by a space
        if (strpos($table, ' ') !== false) {
            // if the alias is written with the AS keyword, remove it
            $table = preg_replace('/\s+AS\s+/i', ' ', $table);

            // Grab the alias
            $table = trim(strrchr($table, ' '));

            // Store the alias, if it doesn't already exist
            $this->db->addTableAlias($table);
        }
    }

    /**
     * Compile the SELECT statement
     *
     * Generates a query string based on which functions were used.
     * Should not be called directly.
     *
     * @param mixed $selectOverride
     */
    protected function compileSelect($selectOverride = false): string
    {
        if ($selectOverride !== false) {
            $sql = $selectOverride;
        } else {
            $sql = (! $this->QBDistinct) ? 'SELECT ' : 'SELECT DISTINCT ';

            if (empty($this->QBSelect)) {
                $sql .= '*';
            } else {
                // Cycle through the "select" portion of the query and prep each column name.
                // The reason we protect identifiers here rather than in the select() function
                // is because until the user calls the from() function we don't know if there are aliases
                foreach ($this->QBSelect as $key => $val) {
                    $noEscape             = $this->QBNoEscape[$key] ?? null;
                    $this->QBSelect[$key] = $this->db->protectIdentifiers($val, false, $noEscape);
                }

                $sql .= implode(', ', $this->QBSelect);
            }
        }

        if (! empty($this->QBFrom)) {
            $sql .= "\nFROM " . $this->_fromTables();
        }

        if (! empty($this->QBJoin)) {
            $sql .= "\n" . implode("\n", $this->QBJoin);
        }

        $sql .= $this->compileWhereHaving('QBWhere')
            . $this->compileGroupBy()
            . $this->compileWhereHaving('QBHaving')
            . $this->compileOrderBy();

        if ($this->QBLimit) {
            return $this->_limit($sql . "\n");
        }

        return $sql;
    }

    /**
     * Checks if the ignore option is supported by
     * the Database Driver for the specific statement.
     *
     * @return string
     */
    protected function compileIgnore(string $statement)
    {
        if ($this->QBIgnore && isset($this->supportedIgnoreStatements[$statement])) {
            return trim($this->supportedIgnoreStatements[$statement]) . ' ';
        }

        return '';
    }

    /**
     * Escapes identifiers in WHERE and HAVING statements at execution time.
     *
     * Required so that aliases are tracked properly, regardless of whether
     * where(), orWhere(), having(), orHaving are called prior to from(),
     * join() and prefixTable is added only if needed.
     *
     * @param string $qbKey 'QBWhere' or 'QBHaving'
     *
     * @return string SQL statement
     */
    protected function compileWhereHaving(string $qbKey): string
    {
        if (! empty($this->{$qbKey})) {
            foreach ($this->{$qbKey} as &$qbkey) {
                // Is this condition already compiled?
                if (is_string($qbkey)) {
                    continue;
                }

                if ($qbkey['escape'] === false) {
                    $qbkey = $qbkey['condition'];

                    continue;
                }

                // Split multiple conditions
                $conditions = preg_split(
                    '/((?:^|\s+)AND\s+|(?:^|\s+)OR\s+)/i',
                    $qbkey['condition'],
                    -1,
                    PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY
                );

                foreach ($conditions as &$condition) {
                    if (($op = $this->getOperator($condition)) === false
                        || ! preg_match('/^(\(?)(.*)(' . preg_quote($op, '/') . ')\s*(.*(?<!\)))?(\)?)$/i', $condition, $matches)
                    ) {
                        continue;
                    }
                    // $matches = array(
                    //	0 => '(test <= foo)',	/* the whole thing */
                    //	1 => '(',		/* optional */
                    //	2 => 'test',		/* the field name */
                    //	3 => ' <= ',		/* $op */
                    //	4 => 'foo',		/* optional, if $op is e.g. 'IS NULL' */
                    //	5 => ')'		/* optional */
                    // );

                    if (! empty($matches[4])) {
                        $protectIdentifiers = false;
                        if (strpos($matches[4], '.') !== false) {
                            $protectIdentifiers = true;
                        }

                        if (strpos($matches[4], ':') === false) {
                            $matches[4] = $this->db->protectIdentifiers(trim($matches[4]), false, $protectIdentifiers);
                        }

                        $matches[4] = ' ' . $matches[4];
                    }

                    $condition = $matches[1] . $this->db->protectIdentifiers(trim($matches[2]))
                        . ' ' . trim($matches[3]) . $matches[4] . $matches[5];
                }

                $qbkey = implode('', $conditions);
            }

            return ($qbKey === 'QBHaving' ? "\nHAVING " : "\nWHERE ")
                . implode("\n", $this->{$qbKey});
        }

        return '';
    }

    /**
     * Escapes identifiers in GROUP BY statements at execution time.
     *
     * Required so that aliases are tracked properly, regardless of whether
     * groupBy() is called prior to from(), join() and prefixTable is added
     * only if needed.
     */
    protected function compileGroupBy(): string
    {
        if (! empty($this->QBGroupBy)) {
            foreach ($this->QBGroupBy as &$groupBy) {
                // Is it already compiled?
                if (is_string($groupBy)) {
                    continue;
                }

                $groupBy = ($groupBy['escape'] === false || $this->isLiteral($groupBy['field']))
                    ? $groupBy['field']
                    : $this->db->protectIdentifiers($groupBy['field']);
            }

            return "\nGROUP BY " . implode(', ', $this->QBGroupBy);
        }

        return '';
    }

    /**
     * Escapes identifiers in ORDER BY statements at execution time.
     *
     * Required so that aliases are tracked properly, regardless of whether
     * orderBy() is called prior to from(), join() and prefixTable is added
     * only if needed.
     */
    protected function compileOrderBy(): string
    {
        if (is_array($this->QBOrderBy) && ! empty($this->QBOrderBy)) {
            foreach ($this->QBOrderBy as &$orderBy) {
                if ($orderBy['escape'] !== false && ! $this->isLiteral($orderBy['field'])) {
                    $orderBy['field'] = $this->db->protectIdentifiers($orderBy['field']);
                }

                $orderBy = $orderBy['field'] . $orderBy['direction'];
            }

            return $this->QBOrderBy = "\nORDER BY " . implode(', ', $this->QBOrderBy);
        }

        if (is_string($this->QBOrderBy)) {
            return $this->QBOrderBy;
        }

        return '';
    }

    /**
     * Takes an object as input and converts the class variables to array key/vals
     *
     * @param object $object
     *
     * @return array
     */
    protected function objectToArray($object)
    {
        if (! is_object($object)) {
            return $object;
        }

        $array = [];

        foreach (get_object_vars($object) as $key => $val) {
            // There are some built in keys we need to ignore for this conversion
            if (! is_object($val) && ! is_array($val) && $key !== '_parent_name') {
                $array[$key] = $val;
            }
        }

        return $array;
    }

    /**
     * Takes an object as input and converts the class variables to array key/vals
     *
     * @param object $object
     *
     * @return array
     */
    protected function batchObjectToArray($object)
    {
        if (! is_object($object)) {
            return $object;
        }

        $array  = [];
        $out    = get_object_vars($object);
        $fields = array_keys($out);

        foreach ($fields as $val) {
            // There are some built in keys we need to ignore for this conversion
            if ($val !== '_parent_name') {
                $i = 0;

                foreach ($out[$val] as $data) {
                    $array[$i++][$val] = $data;
                }
            }
        }

        return $array;
    }

    /**
     * Determines if a string represents a literal value or a field name
     */
    protected function isLiteral(string $str): bool
    {
        $str = trim($str);

        if (empty($str)
            || ctype_digit($str)
            || (string) (float) $str === $str
            || in_array(strtoupper($str), ['TRUE', 'FALSE'], true)
        ) {
            return true;
        }

        if ($this->isLiteralStr === []) {
            $this->isLiteralStr = $this->db->escapeChar !== '"' ? ['"', "'"] : ["'"];
        }

        return in_array($str[0], $this->isLiteralStr, true);
    }

    /**
     * Publicly-visible method to reset the QB values.
     *
     * @return $this
     */
    public function resetQuery()
    {
        $this->resetSelect();
        $this->resetWrite();

        return $this;
    }

    /**
     * Resets the query builder values.  Called by the get() function
     *
     * @param array $qbResetItems An array of fields to reset
     */
    protected function resetRun(array $qbResetItems)
    {
        foreach ($qbResetItems as $item => $defaultValue) {
            $this->{$item} = $defaultValue;
        }
    }

    /**
     * Resets the query builder values.  Called by the get() function
     */
    protected function resetSelect()
    {
        $this->resetRun([
            'QBSelect'   => [],
            'QBJoin'     => [],
            'QBWhere'    => [],
            'QBGroupBy'  => [],
            'QBHaving'   => [],
            'QBOrderBy'  => [],
            'QBNoEscape' => [],
            'QBDistinct' => false,
            'QBLimit'    => false,
            'QBOffset'   => false,
        ]);

        if (! empty($this->db)) {
            $this->db->setAliasedTables([]);
        }

        // Reset QBFrom part
        if (! empty($this->QBFrom)) {
            $this->from(array_shift($this->QBFrom), true);
        }
    }

    /**
     * Resets the query builder "write" values.
     *
     * Called by the insert() update() insertBatch() updateBatch() and delete() functions
     */
    protected function resetWrite()
    {
        $this->resetRun([
            'QBSet'     => [],
            'QBJoin'    => [],
            'QBWhere'   => [],
            'QBOrderBy' => [],
            'QBKeys'    => [],
            'QBLimit'   => false,
            'QBIgnore'  => false,
        ]);
    }

    /**
     * Tests whether the string has an SQL operator
     */
    protected function hasOperator(string $str): bool
    {
        return preg_match(
            '/(<|>|!|=|\sIS NULL|\sIS NOT NULL|\sEXISTS|\sBETWEEN|\sLIKE|\sIN\s*\(|\s)/i',
            trim($str)
        ) === 1;
    }

    /**
     * Returns the SQL string operator
     *
     * @return mixed
     */
    protected function getOperator(string $str, bool $list = false)
    {
        if ($this->pregOperators === []) {
            $_les = $this->db->likeEscapeStr !== ''
                ? '\s+' . preg_quote(trim(sprintf($this->db->likeEscapeStr, $this->db->likeEscapeChar)), '/')
                : '';
            $this->pregOperators = [
                '\s*(?:<|>|!)?=\s*', // =, <=, >=, !=
                '\s*<>?\s*', // <, <>
                '\s*>\s*', // >
                '\s+IS NULL', // IS NULL
                '\s+IS NOT NULL', // IS NOT NULL
                '\s+EXISTS\s*\(.*\)', // EXISTS(sql)
                '\s+NOT EXISTS\s*\(.*\)', // NOT EXISTS(sql)
                '\s+BETWEEN\s+', // BETWEEN value AND value
                '\s+IN\s*\(.*\)', // IN(list)
                '\s+NOT IN\s*\(.*\)', // NOT IN (list)
                '\s+LIKE\s+\S.*(' . $_les . ')?', // LIKE 'expr'[ ESCAPE '%s']
                '\s+NOT LIKE\s+\S.*(' . $_les . ')?', // NOT LIKE 'expr'[ ESCAPE '%s']
            ];
        }

        return preg_match_all(
            '/' . implode('|', $this->pregOperators) . '/i',
            $str,
            $match
        ) ? ($list ? $match[0] : $match[0][0]) : false;
    }

    /**
     * Stores a bind value after ensuring that it's unique.
     * While it might be nicer to have named keys for our binds array
     * with PHP 7+ we get a huge memory/performance gain with indexed
     * arrays instead, so lets take advantage of that here.
     *
     * @param mixed $value
     */
    protected function setBind(string $key, $value = null, bool $escape = true): string
    {
        if (! array_key_exists($key, $this->binds)) {
            $this->binds[$key] = [
                $value,
                $escape,
            ];

            return $key;
        }

        if (! array_key_exists($key, $this->bindsKeyCount)) {
            $this->bindsKeyCount[$key] = 1;
        }

        $count = $this->bindsKeyCount[$key]++;

        $this->binds[$key . '.' . $count] = [
            $value,
            $escape,
        ];

        return $key . '.' . $count;
    }

    /**
     * Returns a clone of a Base Builder with reset query builder values.
     *
     * @return $this
     */
    protected function cleanClone()
    {
        return (clone $this)->from([], true)->resetQuery();
    }
}