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# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

from __future__ import annotations

import logging
import os
import re
from pathlib import Path
from typing import List
from typing_extensions import TypedDict
from packaging.version import InvalidVersion, Version, parse as parse_version

from clcommon.clwpos_lib import find_wp_paths, get_wp_cache_plugin
from clcommon.cpapi import userdomains, get_main_username_by_uid, get_installed_php_versions, getCPName

from clwpos import _
from clwpos.cl_wpos_exceptions import WposError
from clwpos.daemon import WposDaemon
from clwpos.php.base import PHP
from clwpos.scoped_cache import cached_in_scope
from clwpos.utils import (
    daemon_communicate,
    _get_data_from_info_json
)


def _get_doc_roots_info() -> dict:
    user = get_main_username_by_uid(os.geteuid())
    result = {}
    for domain, doc_root in userdomains(user):
        result.setdefault(doc_root, []).append(domain)

    return result


def has_wps(username: str) -> bool:
    """Check if user has at least one WordPress installation"""
    _info = userdomains(username)
    # all docroots (like it is done in `_add_wp_path_info`)
    excludes = list(i[1] for i in _info)
    for domain, doc_root in _info:
        wps = list(find_wp_paths(doc_root, excludes=excludes))
        # return immediately once first WP installation found
        if len(wps):
            return True
    return False


def _add_wp_path_info(user_info: dict) -> dict:
    wp_paths = {}
    for doc_root, domains in user_info.items():
        # excludes only affects subpaths of doc_root
        excludes = list(user_info)
        item = {
            "domains": domains,
            "wp_paths": list(find_wp_paths(doc_root, excludes=excludes)),
        }
        wp_paths[doc_root] = item
    return wp_paths


_WP_VERSION_RE = re.compile(r"""wp_version\s*=\s*(?:'|")([^"']+)(?:'|")\s*;""", re.MULTILINE)


def _get_wp_info_from_version_php_code(content: str) -> str | None:
    """
    Simply search a value of `wp_version` variable in PHP code without evaluation
    """
    match = _WP_VERSION_RE.search(content)
    try:
        return match.group(1).strip() if match else None
    except IndexError:
        return None


def _wp_info(doc_root: str, wp_path: str) -> dict:
    """Convert WP path to {"path": str, "version": str}"""
    absolute_wp_path = Path(doc_root, wp_path)

    version_missing_reason = None
    version_php = absolute_wp_path / "wp-includes/version.php"
    try:
        version_php_code = version_php.read_text("utf-8", errors="ignore")
    except OSError:
        version_raw = None
        version_missing_reason = _("wp-includes/version.php file is missing")
    else:
        version_raw = _get_wp_info_from_version_php_code(version_php_code)
        if not version_raw:
            version_missing_reason = _("wp-includes/version.php file is invalid")

    version = None
    if version_raw:
        try:
            version = parse_version(version_raw)
        except InvalidVersion:
            version_missing_reason = _("wp-includes/version.php contains invalid identifier")

    return {
        "path": wp_path,
        "version": version,
        "version_missing_reason": version_missing_reason,
    }


def _add_wp_info(user_info: dict) -> dict:
    for doc_root, doc_root_info in user_info.items():
        wp_paths = doc_root_info.pop("wp_paths")
        doc_root_info["wps"] = [_wp_info(doc_root, wp_path) for wp_path in wp_paths]
    return user_info


@cached_in_scope
def _php_get_vhost_versions(uid):
    """
    uid param is used for caching each distinct uid
    @return: [
        {
            "account": "rm3",
            "documentroot": "/home/example/public_html",
            "version": "ea-php72",
            "handler": "php-fpm",
            "vhost": "otherchars.rm3.tld"
        }
    ]
    """
    try:
        return daemon_communicate({"command": WposDaemon.DAEMON_PHP_GET_VHOST_VERSIONS_COMMAND})["data"]
    except WposError:
        return _get_data_from_info_json("vhost_versions")

def _is_php_selector_applicable(handler):
    """
    1. If handler is not set to lsphp -> php version selected in PHP Selector will not be applied:
    https://cloudlinux.zendesk.com/hc/en-us/articles/4414030658962-PHP-Selector-does-not-apply-on-a-server-with-DirectAdmin-panel
    DirectAdmin PHP Selector could override CloudLinux PHP selector, even loaded .ini could not give 100%

    So let's do not even try apply selector, if it has no sense
    """
    if getCPName() == 'DirectAdmin' and handler != 'lsapi':
        return False
    return True



class Info(TypedDict):
    # e.g. 'user10.com'
    vhost: str

    # e.g. 'user10'
    account: str

    # e.g. 'system-php72'
    version: PHP

    # e.g. 'php-fpm'
    handler: str

    # e.g. '/home/user10/public_html'
    documentroot: str


def php_info() -> List[Info]:
    """
    Returns php info, example:
    [{'vhost': 'sub.wposuser.com', 'account': 'stackoverflow',
    'version': 'ea-php80', 'handler': 'php-fpm',
    'documentroot': '/home/stackoverflow/public_html'},
    ...................................................................]
    """
    installed_php_versions = get_cached_php_installed_versions()
    vhosts_php_description = _php_get_vhost_versions(os.geteuid())

    result = []
    for vhost_data in vhosts_php_description:
        try:
            php_version = next(
                version for version in installed_php_versions
                if version.identifier == vhost_data['version'])
        except:
            raise RuntimeError("%s version is not known %s" % (
                vhost_data['version'], installed_php_versions))

        version_used = php_version if not _is_php_selector_applicable(vhost_data['handler']) \
            else php_version.apply_php_selector()

        result.append(Info(
            vhost=vhost_data['vhost'],
            account=vhost_data['account'],
            version=version_used,
            handler=vhost_data['handler'],
            documentroot=vhost_data['documentroot'],
        ))

    return result


def _add_php(user_info: dict) -> dict:
    """
    Updates user_info dict with php data
    """
    result = php_info()
    for item in result:
        if item["documentroot"] not in user_info:
            raise WposError(_("Documentroot %(documentroot)s is missing in user information. "
                              "This might indicate that hosting account information was "
                              "changed by the control panel during data processing. "
                              "Usually this is not fatal, try again later and "
                              "contact CloudLinux support if the issue persists."),
                            context=dict(documentroot=item["documentroot"]))

        user_info[item["documentroot"]]["php"] = {
            "version": item["version"],
            "handler": item["handler"]
        }

    return user_info


def _add_object_cache_info(user_info: dict) -> dict:
    """
    Search for 'object-cache.php' files in 'wp-content/plugins' directory
    in order to find what plugin is being used for object caching.
    """
    for doc_root, doc_root_info in user_info.items():
        for wp in doc_root_info["wps"]:
            plugin = get_wp_cache_plugin(Path(doc_root).joinpath(wp["path"]), "object-cache")
            wp["object_cache"] = plugin

    return user_info


def get_user_info() -> dict:
    """
    Collect info about user.
    @return {
        '/home/user/public_html': {
            'domains': ['domain.com'],
            'wps': [
                {
                    'path': 'wp_path_1',
                    'version': '5.7.2',
                    'object_cache': 'redis-cache'
                },
                {
                    'path': 'wp_path_2',
                    'version': None,
                    'object_cache': 'redis-cache'
                }
            ],
            'php': {
                'version': 'ea-php74',
                'handler': 'cgi',
                'redis_extension': False
            }
        }
    }
    """
    user_info = _get_doc_roots_info()

    for func in (_add_wp_path_info, _add_wp_info, _add_php):
        user_info = func(user_info)

    return user_info


def _php_get_installed_versions():
    """
    @return: [
        "ea-php74"
    ]
    """
    if os.geteuid():
        try:
            return daemon_communicate({
                "command": WposDaemon.DAEMON_PHP_GET_INSTALLED_VERSIONS_COMMAND
            })["data"]
        except WposError:
            return _get_data_from_info_json("installed_versions")
    return get_installed_php_versions()


@cached_in_scope
def get_cached_php_installed_versions() -> List[PHP]:
    """
    List all installed php version on the system
    :return: installed php version
    """
    result = _php_get_installed_versions()

    installed_php_versions = [
        PHP(
            identifier=php_description['identifier'],
            version=php_description['version'],
            modules_dir=php_description['modules_dir'],
            dir=php_description['dir'],
            bin=php_description['bin'],
            ini=php_description['ini']
        )
        for php_description in result
    ]
    return installed_php_versions