<?php
/**
 * Generic plugin interface.
 */

declare(strict_types=1);

namespace PhpMyAdmin;

use PhpMyAdmin\Html\MySQLDocumentation;
use PhpMyAdmin\Plugins\AuthenticationPlugin;
use PhpMyAdmin\Plugins\ExportPlugin;
use PhpMyAdmin\Plugins\ImportPlugin;
use PhpMyAdmin\Plugins\SchemaPlugin;
use PhpMyAdmin\Properties\Options\Groups\OptionsPropertySubgroup;
use PhpMyAdmin\Properties\Options\Items\BoolPropertyItem;
use PhpMyAdmin\Properties\Options\Items\DocPropertyItem;
use PhpMyAdmin\Properties\Options\Items\HiddenPropertyItem;
use PhpMyAdmin\Properties\Options\Items\MessageOnlyPropertyItem;
use PhpMyAdmin\Properties\Options\Items\NumberPropertyItem;
use PhpMyAdmin\Properties\Options\Items\RadioPropertyItem;
use PhpMyAdmin\Properties\Options\Items\SelectPropertyItem;
use PhpMyAdmin\Properties\Options\Items\TextPropertyItem;
use PhpMyAdmin\Properties\Options\OptionsPropertyItem;
use PhpMyAdmin\Properties\Plugins\ExportPluginProperties;
use PhpMyAdmin\Properties\Plugins\PluginPropertyItem;
use PhpMyAdmin\Properties\Plugins\SchemaPluginProperties;
use function array_pop;
use function class_exists;
use function count;
use function explode;
use function get_class;
use function htmlspecialchars;
use function is_file;
use function mb_strlen;
use function mb_strpos;
use function mb_strtolower;
use function mb_strtoupper;
use function mb_substr;
use function method_exists;
use function opendir;
use function preg_match;
use function preg_match_all;
use function readdir;
use function str_replace;
use function strcasecmp;
use function strcmp;
use function strtolower;
use function ucfirst;
use function usort;

/**
 * PhpMyAdmin\Plugins class
 */
class Plugins
{
    /**
     * Includes and instantiates the specified plugin type for a certain format
     *
     * @param string $plugin_type   the type of the plugin (import, export, etc)
     * @param string $plugin_format the format of the plugin (sql, xml, et )
     * @param string $plugins_dir   directory with plugins
     * @param mixed  $plugin_param  parameter to plugin by which they can
     *                              decide whether they can work
     *
     * @return object|null new plugin instance
     */
    public static function getPlugin(
        $plugin_type,
        $plugin_format,
        $plugins_dir,
        $plugin_param = false
    ) {
        $GLOBALS['plugin_param'] = $plugin_param;
        $class_name = mb_strtoupper($plugin_type[0])
            . mb_strtolower(mb_substr($plugin_type, 1))
            . mb_strtoupper($plugin_format[0])
            . mb_strtolower(mb_substr($plugin_format, 1));
        $file = $class_name . '.php';

        $fullFsPathPluginDir = ROOT_PATH . $plugins_dir;

        if (is_file($fullFsPathPluginDir . $file)) {
            //include_once $fullFsPathPluginDir . $file;
            $fqnClass = 'PhpMyAdmin\\' . str_replace('/', '\\', mb_substr($plugins_dir, 18)) . $class_name;
            // check if class exists, could be caused by skip_import
            if (class_exists($fqnClass)) {
                return new $fqnClass();
            }
        }

        return null;
    }

    /**
     * @param string $type server|database|table|raw
     *
     * @return ExportPlugin[]
     */
    public static function getExport(string $type, bool $singleTable): array
    {
        return self::getPlugins('export', 'libraries/classes/Plugins/Export/', [
            'export_type' => $type,
            'single_table' => $singleTable,
        ]);
    }

    /**
     * @param string $type server|database|table
     *
     * @return ImportPlugin[]
     */
    public static function getImport(string $type): array
    {
        return self::getPlugins('import', 'libraries/classes/Plugins/Import/', $type);
    }

    /**
     * @return SchemaPlugin[]
     */
    public static function getSchema(): array
    {
        return self::getPlugins('schema', 'libraries/classes/Plugins/Schema/', null);
    }

    /**
     * Reads all plugin information from directory $plugins_dir
     *
     * @param string            $plugin_type  the type of the plugin (import, export, etc)
     * @param string            $plugins_dir  directory with plugins
     * @param array|string|null $plugin_param parameter to plugin by which they can
     *                                        decide whether they can work
     *
     * @return array list of plugin instances
     */
    private static function getPlugins(string $plugin_type, string $plugins_dir, $plugin_param): array
    {
        global $skip_import;

        $GLOBALS['plugin_param'] = $plugin_param;

        $fullFsPathPluginDir = ROOT_PATH . $plugins_dir;

        $handle = @opendir($fullFsPathPluginDir);
        if (! $handle) {
            return [];
        }

        $plugin_list = [];

        $namespace = 'PhpMyAdmin\\' . str_replace('/', '\\', mb_substr($plugins_dir, 18));
        $class_type = mb_strtoupper($plugin_type[0], 'UTF-8')
            . mb_strtolower(mb_substr($plugin_type, 1), 'UTF-8');

        $prefix_class_name = $namespace . $class_type;

        while ($file = @readdir($handle)) {
            // In some situations, Mac OS creates a new file for each file
            // (for example ._csv.php) so the following regexp
            // matches a file which does not start with a dot but ends
            // with ".php"
            if (! is_file($fullFsPathPluginDir . $file)
                || ! preg_match(
                    '@^' . $class_type . '([^\.]+)\.php$@i',
                    $file,
                    $matches
                )
            ) {
                continue;
            }

            /** @var bool $skip_import */
            $skip_import = false;

            include_once $fullFsPathPluginDir . $file;

            if ($skip_import) {
                continue;
            }

            $class_name = $prefix_class_name . $matches[1];
            $plugin = new $class_name();
            if ($plugin->getProperties() === null) {
                continue;
            }

            $plugin_list[] = $plugin;
        }

        usort(
            $plugin_list,
            /**
             * @param mixed $cmp_name_1
             * @param mixed $cmp_name_2
             */
            static function ($cmp_name_1, $cmp_name_2) {
                return strcasecmp(
                    $cmp_name_1->getProperties()->getText(),
                    $cmp_name_2->getProperties()->getText()
                );
            }
        );

        return $plugin_list;
    }

    /**
     * Returns locale string for $name or $name if no locale is found
     *
     * @param string $name for local string
     *
     * @return string  locale string for $name
     */
    public static function getString($name)
    {
        return $GLOBALS[$name] ?? $name;
    }

    /**
     * Returns html input tag option 'checked' if plugin $opt
     * should be set by config or request
     *
     * @param string $section name of config section in
     *                        $GLOBALS['cfg'][$section] for plugin
     * @param string $opt     name of option
     *
     * @return string  html input tag option 'checked'
     */
    public static function checkboxCheck($section, $opt)
    {
        // If the form is being repopulated using $_GET data, that is priority
        if (isset($_GET[$opt])
            || ! isset($_GET['repopulate'])
            && ((! empty($GLOBALS['timeout_passed']) && isset($_REQUEST[$opt]))
            || ! empty($GLOBALS['cfg'][$section][$opt]))
        ) {
            return ' checked="checked"';
        }

        return '';
    }

    /**
     * Returns default value for option $opt
     *
     * @param string $section name of config section in
     *                        $GLOBALS['cfg'][$section] for plugin
     * @param string $opt     name of option
     *
     * @return string  default value for option $opt
     */
    public static function getDefault($section, $opt)
    {
        if (isset($_GET[$opt])) {
            // If the form is being repopulated using $_GET data, that is priority
            return htmlspecialchars($_GET[$opt]);
        }

        if (isset($GLOBALS['timeout_passed'], $_REQUEST[$opt]) && $GLOBALS['timeout_passed']) {
            return htmlspecialchars($_REQUEST[$opt]);
        }

        if (! isset($GLOBALS['cfg'][$section][$opt])) {
            return '';
        }

        $matches = [];
        /* Possibly replace localised texts */
        if (! preg_match_all(
            '/(str[A-Z][A-Za-z0-9]*)/',
            (string) $GLOBALS['cfg'][$section][$opt],
            $matches
        )) {
            return htmlspecialchars((string) $GLOBALS['cfg'][$section][$opt]);
        }

        $val = $GLOBALS['cfg'][$section][$opt];
        foreach ($matches[0] as $match) {
            if (! isset($GLOBALS[$match])) {
                continue;
            }

            $val = str_replace($match, $GLOBALS[$match], $val);
        }

        return htmlspecialchars($val);
    }

    /**
     * Returns html select form element for plugin choice
     * and hidden fields denoting whether each plugin must be exported as a file
     *
     * @param string $section name of config section in
     *                        $GLOBALS['cfg'][$section] for plugin
     * @param string $name    name of select element
     * @param array  $list    array with plugin instances
     * @param string $cfgname name of config value, if none same as $name
     *
     * @return string  html select tag
     */
    public static function getChoice($section, $name, array $list, $cfgname = null)
    {
        if (! isset($cfgname)) {
            $cfgname = $name;
        }
        $ret = '<select id="plugins" name="' . $name . '">';
        $default = self::getDefault($section, $cfgname);
        $hidden = null;
        foreach ($list as $plugin) {
            $elem = explode('\\', get_class($plugin));
            $plugin_name = (string) array_pop($elem);
            unset($elem);
            $plugin_name = mb_strtolower(
                mb_substr(
                    $plugin_name,
                    mb_strlen($section)
                )
            );
            $ret .= '<option';
             // If the form is being repopulated using $_GET data, that is priority
            if (isset($_GET[$name])
                && $plugin_name == $_GET[$name]
                || ! isset($_GET[$name])
                && $plugin_name == $default
            ) {
                $ret .= ' selected="selected"';
            }

            /** @var PluginPropertyItem $properties */
            $properties = $plugin->getProperties();
            $text = null;
            if ($properties != null) {
                $text = $properties->getText();
            }
            $ret .= ' value="' . $plugin_name . '">'
               . self::getString($text)
               . '</option>' . "\n";

            // Whether each plugin has to be saved as a file
            $hidden .= '<input type="hidden" id="force_file_' . $plugin_name
                . '" value="';
            /** @var ExportPluginProperties|SchemaPluginProperties $properties */
            $properties = $plugin->getProperties();
            if (! strcmp($section, 'Import')
                || ($properties != null && $properties->getForceFile() != null)
            ) {
                $hidden .= 'true';
            } else {
                $hidden .= 'false';
            }
            $hidden .= '">' . "\n";
        }
        $ret .= '</select>' . "\n" . $hidden;

        return $ret;
    }

    /**
     * Returns single option in a list element
     *
     * @param string              $section       name of config section in $GLOBALS['cfg'][$section] for plugin
     * @param string              $plugin_name   unique plugin name
     * @param OptionsPropertyItem $propertyGroup options property main group instance
     * @param bool                $is_subgroup   if this group is a subgroup
     *
     * @return string  table row with option
     */
    public static function getOneOption(
        $section,
        $plugin_name,
        &$propertyGroup,
        $is_subgroup = false
    ) {
        $ret = "\n";

        $properties = null;
        if (! $is_subgroup) {
            // for subgroup headers
            if (mb_strpos(get_class($propertyGroup), 'PropertyItem')) {
                $properties = [$propertyGroup];
            } else {
                // for main groups
                $ret .= '<div class="export_sub_options" id="' . $plugin_name . '_'
                    . $propertyGroup->getName() . '">';

                $text = null;
                if (method_exists($propertyGroup, 'getText')) {
                    $text = $propertyGroup->getText();
                }

                if ($text != null) {
                    $ret .= '<h4>' . self::getString($text) . '</h4>';
                }
                $ret .= '<ul>';
            }
        }

        if (! isset($properties)) {
            $not_subgroup_header = true;
            if (method_exists($propertyGroup, 'getProperties')) {
                $properties = $propertyGroup->getProperties();
            }
        }

        $property_class = null;
        if (isset($properties)) {
            /** @var OptionsPropertySubgroup $propertyItem */
            foreach ($properties as $propertyItem) {
                $property_class = get_class($propertyItem);
                // if the property is a subgroup, we deal with it recursively
                if (mb_strpos($property_class, 'Subgroup')) {
                    // for subgroups
                    // each subgroup can have a header, which may also be a form element
                    /** @var OptionsPropertyItem $subgroup_header */
                    $subgroup_header = $propertyItem->getSubgroupHeader();
                    if ($subgroup_header !== null) {
                        $ret .= self::getOneOption(
                            $section,
                            $plugin_name,
                            $subgroup_header
                        );
                    }

                    $ret .= '<li class="subgroup"><ul';
                    if ($subgroup_header !== null) {
                        $ret .= ' id="ul_' . $subgroup_header->getName() . '">';
                    } else {
                        $ret .= '>';
                    }

                    $ret .=  self::getOneOption(
                        $section,
                        $plugin_name,
                        $propertyItem,
                        true
                    );
                    continue;
                }

                // single property item
                $ret .= self::getHtmlForProperty(
                    $section,
                    $plugin_name,
                    $propertyItem
                );
            }
        }

        if ($is_subgroup) {
            // end subgroup
            $ret .= '</ul></li>';
        } else {
            // end main group
            if (! empty($not_subgroup_header)) {
                $ret .= '</ul></div>';
            }
        }

        if (method_exists($propertyGroup, 'getDoc')) {
            $doc = $propertyGroup->getDoc();
            if ($doc != null) {
                if (count($doc) === 3) {
                    $ret .= MySQLDocumentation::show(
                        $doc[1],
                        false,
                        null,
                        null,
                        $doc[2]
                    );
                } elseif (count($doc) === 1) {
                    $ret .= MySQLDocumentation::showDocumentation('faq', $doc[0]);
                } else {
                    $ret .= MySQLDocumentation::show(
                        $doc[1]
                    );
                }
            }
        }

        // Close the list element after $doc link is displayed
        if ($property_class !== null) {
            if ($property_class == BoolPropertyItem::class
                || $property_class == MessageOnlyPropertyItem::class
                || $property_class == SelectPropertyItem::class
                || $property_class == TextPropertyItem::class
            ) {
                $ret .= '</li>';
            }
        }

        return $ret . "\n";
    }

    /**
     * Get HTML for properties items
     *
     * @param string              $section      name of config section in
     *                                          $GLOBALS['cfg'][$section] for plugin
     * @param string              $plugin_name  unique plugin name
     * @param OptionsPropertyItem $propertyItem Property item
     *
     * @return string
     */
    public static function getHtmlForProperty(
        $section,
        $plugin_name,
        $propertyItem
    ) {
        $ret = null;
        $property_class = get_class($propertyItem);
        switch ($property_class) {
            case BoolPropertyItem::class:
                $ret .= '<li>' . "\n";
                $ret .= '<input type="checkbox" name="' . $plugin_name . '_'
                . $propertyItem->getName() . '"'
                . ' value="something" id="checkbox_' . $plugin_name . '_'
                . $propertyItem->getName() . '"'
                . ' '
                . self::checkboxCheck(
                    $section,
                    $plugin_name . '_' . $propertyItem->getName()
                );

                if ($propertyItem->getForce() != null) {
                    // Same code is also few lines lower, update both if needed
                    $ret .= ' onclick="if (!this.checked &amp;&amp; '
                        . '(!document.getElementById(\'checkbox_' . $plugin_name
                        . '_' . $propertyItem->getForce() . '\') '
                        . '|| !document.getElementById(\'checkbox_'
                        . $plugin_name . '_' . $propertyItem->getForce()
                        . '\').checked)) '
                        . 'return false; else return true;"';
                }
                $ret .= '>';
                $ret .= '<label for="checkbox_' . $plugin_name . '_'
                . $propertyItem->getName() . '">'
                . self::getString($propertyItem->getText()) . '</label>';
                break;
            case DocPropertyItem::class:
                echo DocPropertyItem::class;
                break;
            case HiddenPropertyItem::class:
                $ret .= '<li><input type="hidden" name="' . $plugin_name . '_'
                . $propertyItem->getName() . '"'
                . ' value="' . self::getDefault(
                    $section,
                    $plugin_name . '_' . $propertyItem->getName()
                )
                    . '"></li>';
                break;
            case MessageOnlyPropertyItem::class:
                $ret .= '<li>' . "\n";
                $ret .= '<p>' . self::getString($propertyItem->getText()) . '</p>';
                break;
            case RadioPropertyItem::class:
                /**
                 * @var RadioPropertyItem $pitem
                 */
                $pitem = $propertyItem;

                $default = self::getDefault(
                    $section,
                    $plugin_name . '_' . $pitem->getName()
                );

                foreach ($pitem->getValues() as $key => $val) {
                    $ret .= '<li><input type="radio" name="' . $plugin_name
                        . '_' . $pitem->getName() . '" value="' . $key
                        . '" id="radio_' . $plugin_name . '_'
                        . $pitem->getName() . '_' . $key . '"';
                    if ($key == $default) {
                        $ret .= ' checked="checked"';
                    }
                    $ret .= '><label for="radio_' . $plugin_name . '_'
                    . $pitem->getName() . '_' . $key . '">'
                    . self::getString($val) . '</label></li>';
                }
                break;
            case SelectPropertyItem::class:
                /**
                 * @var SelectPropertyItem $pitem
                 */
                $pitem = $propertyItem;
                $ret .= '<li>' . "\n";
                $ret .= '<label for="select_' . $plugin_name . '_'
                . $pitem->getName() . '" class="desc">'
                . self::getString($pitem->getText()) . '</label>';
                $ret .= '<select name="' . $plugin_name . '_'
                . $pitem->getName() . '"'
                . ' id="select_' . $plugin_name . '_'
                . $pitem->getName() . '">';
                $default = self::getDefault(
                    $section,
                    $plugin_name . '_' . $pitem->getName()
                );
                foreach ($pitem->getValues() as $key => $val) {
                    $ret .= '<option value="' . $key . '"';
                    if ($key == $default) {
                        $ret .= ' selected="selected"';
                    }
                    $ret .= '>' . self::getString($val) . '</option>';
                }

                $ret .= '</select>';
                break;
            case TextPropertyItem::class:
                /**
                 * @var TextPropertyItem $pitem
                 */
                $pitem = $propertyItem;
                $ret .= '<li>' . "\n";
                $ret .= '<label for="text_' . $plugin_name . '_'
                . $pitem->getName() . '" class="desc">'
                . self::getString($pitem->getText()) . '</label>';
                $ret .= '<input type="text" name="' . $plugin_name . '_'
                . $pitem->getName() . '"'
                . ' value="' . self::getDefault(
                    $section,
                    $plugin_name . '_' . $pitem->getName()
                ) . '"'
                    . ' id="text_' . $plugin_name . '_'
                    . $pitem->getName() . '"'
                    . ($pitem->getSize() != null
                    ? ' size="' . $pitem->getSize() . '"'
                    : '')
                    . ($pitem->getLen() != null
                    ? ' maxlength="' . $pitem->getLen() . '"'
                    : '')
                    . '>';
                break;
            case NumberPropertyItem::class:
                $ret .= '<li>' . "\n";
                $ret .= '<label for="number_' . $plugin_name . '_'
                    . $propertyItem->getName() . '" class="desc">'
                    . self::getString($propertyItem->getText()) . '</label>';
                $ret .= '<input type="number" name="' . $plugin_name . '_'
                    . $propertyItem->getName() . '"'
                    . ' value="' . self::getDefault(
                        $section,
                        $plugin_name . '_' . $propertyItem->getName()
                    ) . '"'
                    . ' id="number_' . $plugin_name . '_'
                    . $propertyItem->getName() . '"'
                    . ' min="0"'
                    . '>';
                break;
            default:
                break;
        }

        return $ret;
    }

    /**
     * Returns html div with editable options for plugin
     *
     * @param string $section name of config section in $GLOBALS['cfg'][$section]
     * @param array  $list    array with plugin instances
     *
     * @return string  html fieldset with plugin options
     */
    public static function getOptions($section, array $list)
    {
        $ret = '';
        // Options for plugins that support them
        foreach ($list as $plugin) {
            $properties = $plugin->getProperties();
            $text = null;
            $options = null;
            if ($properties != null) {
                $text = $properties->getText();
                $options = $properties->getOptions();
            }

            $elem = explode('\\', get_class($plugin));
            $plugin_name = (string) array_pop($elem);
            unset($elem);
            $plugin_name = mb_strtolower(
                mb_substr(
                    $plugin_name,
                    mb_strlen($section)
                )
            );

            $ret .= '<div id="' . $plugin_name
                . '_options" class="format_specific_options">';
            $ret .= '<h3>' . self::getString($text) . '</h3>';

            $no_options = true;
            if ($options !== null && count($options) > 0) {
                foreach ($options->getProperties() as $propertyMainGroup) {
                    // check for hidden properties
                    $no_options = true;
                    foreach ($propertyMainGroup->getProperties() as $propertyItem) {
                        if (strcmp(HiddenPropertyItem::class, get_class($propertyItem))) {
                            $no_options = false;
                            break;
                        }
                    }

                    $ret .= self::getOneOption(
                        $section,
                        $plugin_name,
                        $propertyMainGroup
                    );
                }
            }

            if ($no_options) {
                $ret .= '<p>' . __('This format has no options') . '</p>';
            }
            $ret .= '</div>';
        }

        return $ret;
    }

    public static function getAuthPlugin(): AuthenticationPlugin
    {
        global $cfg;

        $class = 'PhpMyAdmin\\Plugins\\Auth\\Authentication' . ucfirst(strtolower($cfg['Server']['auth_type']));

        if (! class_exists($class)) {
            Core::fatalError(
                __('Invalid authentication method set in configuration:')
                    . ' ' . $cfg['Server']['auth_type']
            );
        }

        /** @var AuthenticationPlugin $plugin */
        $plugin = new $class();

        return $plugin;
    }
}