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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\View;

use CodeIgniter\Autoloader\FileLocator;
use CodeIgniter\Debug\Toolbar\Collectors\Views;
use CodeIgniter\View\Exceptions\ViewException;
use Config\Services;
use Config\Toolbar;
use Config\View as ViewConfig;
use Psr\Log\LoggerInterface;
use RuntimeException;

/**
 * Class View
 */
class View implements RendererInterface
{
    /**
     * Data that is made available to the Views.
     *
     * @var array
     */
    protected $data = [];

    /**
     * Merge savedData and userData
     */
    protected $tempData;

    /**
     * The base directory to look in for our Views.
     *
     * @var string
     */
    protected $viewPath;

    /**
     * The render variables
     *
     * @var array
     */
    protected $renderVars = [];

    /**
     * Instance of FileLocator for when
     * we need to attempt to find a view
     * that's not in standard place.
     *
     * @var FileLocator
     */
    protected $loader;

    /**
     * Logger instance.
     *
     * @var LoggerInterface
     */
    protected $logger;

    /**
     * Should we store performance info?
     *
     * @var bool
     */
    protected $debug = false;

    /**
     * Cache stats about our performance here,
     * when CI_DEBUG = true
     *
     * @var array
     */
    protected $performanceData = [];

    /**
     * @var ViewConfig
     */
    protected $config;

    /**
     * Whether data should be saved between renders.
     *
     * @var bool
     */
    protected $saveData;

    /**
     * Number of loaded views
     *
     * @var int
     */
    protected $viewsCount = 0;

    /**
     * The name of the layout being used, if any.
     * Set by the `extend` method used within views.
     *
     * @var string|null
     */
    protected $layout;

    /**
     * Holds the sections and their data.
     *
     * @var array
     */
    protected $sections = [];

    /**
     * The name of the current section being rendered,
     * if any.
     *
     * @var string|null
     *
     * @deprecated
     */
    protected $currentSection;

    /**
     * The name of the current section being rendered,
     * if any.
     *
     * @var array<string>
     */
    protected $sectionStack = [];

    public function __construct(ViewConfig $config, ?string $viewPath = null, ?FileLocator $loader = null, ?bool $debug = null, ?LoggerInterface $logger = null)
    {
        $this->config   = $config;
        $this->viewPath = rtrim($viewPath, '\\/ ') . DIRECTORY_SEPARATOR;
        $this->loader   = $loader ?? Services::locator();
        $this->logger   = $logger ?? Services::logger();
        $this->debug    = $debug ?? CI_DEBUG;
        $this->saveData = (bool) $config->saveData;
    }

    /**
     * Builds the output based upon a file name and any
     * data that has already been set.
     *
     * Valid $options:
     *  - cache      Number of seconds to cache for
     *  - cache_name Name to use for cache
     *
     * @param string     $view     File name of the view source
     * @param array|null $options  Reserved for 3rd-party uses since
     *                             it might be needed to pass additional info
     *                             to other template engines.
     * @param bool|null  $saveData If true, saves data for subsequent calls,
     *                             if false, cleans the data after displaying,
     *                             if null, uses the config setting.
     */
    public function render(string $view, ?array $options = null, ?bool $saveData = null): string
    {
        $this->renderVars['start'] = microtime(true);

        // Store the results here so even if
        // multiple views are called in a view, it won't
        // clean it unless we mean it to.
        $saveData                    = $saveData ?? $this->saveData;
        $fileExt                     = pathinfo($view, PATHINFO_EXTENSION);
        $realPath                    = empty($fileExt) ? $view . '.php' : $view; // allow Views as .html, .tpl, etc (from CI3)
        $this->renderVars['view']    = $realPath;
        $this->renderVars['options'] = $options ?? [];

        // Was it cached?
        if (isset($this->renderVars['options']['cache'])) {
            $cacheName = $this->renderVars['options']['cache_name'] ?? str_replace('.php', '', $this->renderVars['view']);
            $cacheName = str_replace(['\\', '/'], '', $cacheName);

            $this->renderVars['cacheName'] = $cacheName;

            if ($output = cache($this->renderVars['cacheName'])) {
                $this->logPerformance($this->renderVars['start'], microtime(true), $this->renderVars['view']);

                return $output;
            }
        }

        $this->renderVars['file'] = $this->viewPath . $this->renderVars['view'];

        if (! is_file($this->renderVars['file'])) {
            $this->renderVars['file'] = $this->loader->locateFile($this->renderVars['view'], 'Views', empty($fileExt) ? 'php' : $fileExt);
        }

        // locateFile will return an empty string if the file cannot be found.
        if (empty($this->renderVars['file'])) {
            throw ViewException::forInvalidFile($this->renderVars['view']);
        }

        // Make our view data available to the view.
        $this->tempData = $this->tempData ?? $this->data;

        if ($saveData) {
            $this->data = $this->tempData;
        }

        // Save current vars
        $renderVars = $this->renderVars;

        $output = (function (): string {
            extract($this->tempData);
            ob_start();
            include $this->renderVars['file'];

            return ob_get_clean() ?: '';
        })();

        // Get back current vars
        $this->renderVars = $renderVars;

        // When using layouts, the data has already been stored
        // in $this->sections, and no other valid output
        // is allowed in $output so we'll overwrite it.
        if ($this->layout !== null && $this->sectionStack === []) {
            $layoutView   = $this->layout;
            $this->layout = null;
            // Save current vars
            $renderVars = $this->renderVars;
            $output     = $this->render($layoutView, $options, $saveData);
            // Get back current vars
            $this->renderVars = $renderVars;
        }

        $this->logPerformance($this->renderVars['start'], microtime(true), $this->renderVars['view']);

        if (($this->debug && (! isset($options['debug']) || $options['debug'] === true))
            && in_array('CodeIgniter\Filters\DebugToolbar', service('filters')->getFiltersClass()['after'], true)
        ) {
            $toolbarCollectors = config(Toolbar::class)->collectors;

            if (in_array(Views::class, $toolbarCollectors, true)) {
                // Clean up our path names to make them a little cleaner
                $this->renderVars['file'] = clean_path($this->renderVars['file']);
                $this->renderVars['file'] = ++$this->viewsCount . ' ' . $this->renderVars['file'];

                $output = '<!-- DEBUG-VIEW START ' . $this->renderVars['file'] . ' -->' . PHP_EOL
                    . $output . PHP_EOL
                    . '<!-- DEBUG-VIEW ENDED ' . $this->renderVars['file'] . ' -->' . PHP_EOL;
            }
        }

        // Should we cache?
        if (isset($this->renderVars['options']['cache'])) {
            cache()->save($this->renderVars['cacheName'], $output, (int) $this->renderVars['options']['cache']);
        }

        $this->tempData = null;

        return $output;
    }

    /**
     * Builds the output based upon a string and any
     * data that has already been set.
     * Cache does not apply, because there is no "key".
     *
     * @param string     $view     The view contents
     * @param array|null $options  Reserved for 3rd-party uses since
     *                             it might be needed to pass additional info
     *                             to other template engines.
     * @param bool|null  $saveData If true, saves data for subsequent calls,
     *                             if false, cleans the data after displaying,
     *                             if null, uses the config setting.
     */
    public function renderString(string $view, ?array $options = null, ?bool $saveData = null): string
    {
        $start          = microtime(true);
        $saveData       = $saveData ?? $this->saveData;
        $this->tempData = $this->tempData ?? $this->data;

        if ($saveData) {
            $this->data = $this->tempData;
        }

        $output = (function (string $view): string {
            extract($this->tempData);
            ob_start();
            eval('?>' . $view);

            return ob_get_clean() ?: '';
        })($view);

        $this->logPerformance($start, microtime(true), $this->excerpt($view));
        $this->tempData = null;

        return $output;
    }

    /**
     * Extract first bit of a long string and add ellipsis
     */
    public function excerpt(string $string, int $length = 20): string
    {
        return (strlen($string) > $length) ? substr($string, 0, $length - 3) . '...' : $string;
    }

    /**
     * Sets several pieces of view data at once.
     *
     * @param string $context The context to escape it for: html, css, js, url
     *                        If null, no escaping will happen
     */
    public function setData(array $data = [], ?string $context = null): RendererInterface
    {
        if ($context) {
            $data = \esc($data, $context);
        }

        $this->tempData = $this->tempData ?? $this->data;
        $this->tempData = array_merge($this->tempData, $data);

        return $this;
    }

    /**
     * Sets a single piece of view data.
     *
     * @param mixed       $value
     * @param string|null $context The context to escape it for: html, css, js, url
     *                             If null, no escaping will happen
     */
    public function setVar(string $name, $value = null, ?string $context = null): RendererInterface
    {
        if ($context) {
            $value = esc($value, $context);
        }

        $this->tempData        = $this->tempData ?? $this->data;
        $this->tempData[$name] = $value;

        return $this;
    }

    /**
     * Removes all of the view data from the system.
     */
    public function resetData(): RendererInterface
    {
        $this->data = [];

        return $this;
    }

    /**
     * Returns the current data that will be displayed in the view.
     */
    public function getData(): array
    {
        return $this->tempData ?? $this->data;
    }

    /**
     * Specifies that the current view should extend an existing layout.
     */
    public function extend(string $layout)
    {
        $this->layout = $layout;
    }

    /**
     * Starts holds content for a section within the layout.
     *
     * @param string $name Section name
     */
    public function section(string $name)
    {
        // Saved to prevent BC.
        $this->currentSection = $name;
        $this->sectionStack[] = $name;

        ob_start();
    }

    /**
     * Captures the last section
     *
     * @throws RuntimeException
     */
    public function endSection()
    {
        $contents = ob_get_clean();

        if ($this->sectionStack === []) {
            throw new RuntimeException('View themes, no current section.');
        }

        $section = array_pop($this->sectionStack);

        // Ensure an array exists so we can store multiple entries for this.
        if (! array_key_exists($section, $this->sections)) {
            $this->sections[$section] = [];
        }

        $this->sections[$section][] = $contents;
    }

    /**
     * Renders a section's contents.
     */
    public function renderSection(string $sectionName)
    {
        if (! isset($this->sections[$sectionName])) {
            echo '';

            return;
        }

        foreach ($this->sections[$sectionName] as $key => $contents) {
            echo $contents;
            unset($this->sections[$sectionName][$key]);
        }
    }

    /**
     * Used within layout views to include additional views.
     *
     * @param bool $saveData
     */
    public function include(string $view, ?array $options = null, $saveData = true): string
    {
        return $this->render($view, $options, $saveData);
    }

    /**
     * Returns the performance data that might have been collected
     * during the execution. Used primarily in the Debug Toolbar.
     */
    public function getPerformanceData(): array
    {
        return $this->performanceData;
    }

    /**
     * Logs performance data for rendering a view.
     */
    protected function logPerformance(float $start, float $end, string $view)
    {
        if ($this->debug) {
            $this->performanceData[] = [
                'start' => $start,
                'end'   => $end,
                'view'  => $view,
            ];
        }
    }
}