<?php
/* For licensing terms, see /license.txt */

/**
 * DashboardManager can be used to manage dashboard
 * author Christian Fasanando <christian1827@gmail.com>.
 */
class DashboardManager
{
    /**
     * Constructor.
     */
    public function __construct()
    {
    }

    /**
     * This function allows easy activating and inactivating of Dashboard plugins.
     */
    public static function handle_dashboard_plugins()
    {
        $token = Security::get_existing_token();
        $tokenCondition = '&sec_token='.$token;

        /* We scan the plugin directory. Each folder is a potential plugin. */
        $dashboard_pluginpath = api_get_path(SYS_PLUGIN_PATH).'Dashboard/';
        $possiblePlugins = self::getPossibleDashboardPluginsPath();

        $table_cols = ['name', 'version', 'description'];
        echo Display::page_subheader(get_lang('Dashboard plugins'));
        echo '<form name="plugins" method="post" action="'.api_get_self().'?category='.Security::remove_XSS($_GET['category']).$tokenCondition.'">';
        echo '<table class="table table-hover">';
        echo '<tr>';
        echo '<th width="50px">'.get_lang('Enabled').'</th>';
        echo '<th width="250px">'.get_lang('Name').'</th>';
        echo '<th width="100px">'.get_lang('Version').'</th>';
        echo '<th>'.get_lang('Description').'</th>';
        echo '</tr>';

        $disabled_blocks_data = self::get_block_data_without_plugin();

        // We display all the possible enabled or disabled plugins
        foreach ($possiblePlugins as $testplugin) {
            $plugin_info_file = $dashboard_pluginpath.$testplugin."/$testplugin.info";
            if (file_exists($plugin_info_file) && is_readable($plugin_info_file)) {
                $plugin_info = api_parse_info_file($plugin_info_file);

                // change index to lower case
                $plugin_info = array_change_key_case($plugin_info);
                echo '<tr>';
                self::display_dashboard_plugin_checkboxes($testplugin);
                for ($i = 0; $i < count($table_cols); $i++) {
                    $key = $table_cols[$i];
                    if (isset($plugin_info[$key])) {
                        echo '<td>';
                        echo $plugin_info[$key];
                        echo '</td>';
                    } else {
                        echo '<td></td>';
                    }
                }
                echo '</tr>';
            } else {
                if ('css' != $testplugin) {
                    echo Display::tag(
                        'tr',
                        Display::tag(
                            'td',
                            get_lang('Check file permissions').' '.Security::remove_XSS($plugin_info_file),
                            ['colspan' => '3']
                        )
                    );
                }
            }
        }

        // display all disabled block data
        if (count($disabled_blocks_data) > 0) {
            foreach ($disabled_blocks_data as $disabled_block) {
                echo '<tr style="background-color:#eee">';
                echo '<td><center><input type="checkbox" name="disabled_block" value="true" checked disabled /></center>';
                for ($j = 0; $j < count($table_cols); $j++) {
                    $key = $table_cols[$j];
                    if (isset($disabled_block[$key])) {
                        if (2 == $j) {
                            echo '<td>';
                            echo '<font color="#aaa">'.$disabled_block[$key].'</font><br />';
                            echo '<font color="red">'.get_lang('This plugin has been deleted from the dashboard plugin directory').'</font>';
                            echo '</td>';
                        } else {
                            echo '<td>';
                            echo '<font color="#aaa">'.$disabled_block[$key].'</font>';
                            echo '</td>';
                        }
                    } else {
                        echo '<td>&nbsp;</td>';
                    }
                }
                echo '</tr>';
            }
        }

        echo '</table>';
        echo '<br />';
        echo '<button
            class="btn btn--plain"
            type="submit"
            name="submit_dashboard_plugins"
            value="'.get_lang('Enable dashboard plugins').'">'.
            get_lang('Enable dashboard plugins').'</button></form>';
    }

    /**
     * display checkboxes for Dashboard plugin list.
     *
     * @param string $plugin_path
     */
    public static function display_dashboard_plugin_checkboxes($plugin_path)
    {
        $tbl_block = Database::get_main_table(TABLE_MAIN_BLOCK);

        $sql = "SELECT * FROM $tbl_block
                WHERE path = '".Database::escape_string($plugin_path)."' AND active = 1";
        $rs = Database::query($sql);

        $checked = '';
        if (Database::num_rows($rs) > 0) {
            $checked = "checked";
        }

        echo "<td align=\"center\">";
        echo '<input type="checkbox" name="'.$plugin_path.'" value="true" '.$checked.'/>';
        echo "</td>";
    }

    /**
     * This function allows easy activating and inactivating
     * of plugins and save them inside db.
     *
     * @param array $plugin_paths Dashboard plugin paths
     *                            return int affected rows
     */
    public static function store_dashboard_plugins($plugin_paths)
    {
        $tbl_block = Database::get_main_table(TABLE_MAIN_BLOCK);
        $affected_rows = 0;

        // get all plugins path inside plugin directory
        $dashboard_pluginpath = api_get_path(SYS_PLUGIN_PATH).'Dashboard/';
        $possiblePlugins = self::getPossibleDashboardPluginsPath();

        if (count($possiblePlugins) > 0) {
            $selected_plugins = array_intersect(array_keys($plugin_paths), $possiblePlugins);
            $not_selected_plugins = array_diff($possiblePlugins, array_keys($plugin_paths));

            // get blocks id from not selected path
            $not_selected_blocks_id = [];
            foreach ($not_selected_plugins as $plugin) {
                $block_data = self::get_enabled_dashboard_blocks($plugin);
                if (!empty($block_data[$plugin])) {
                    $not_selected_blocks_id[] = $block_data[$plugin]['id'];
                }
            }

            /* clean not selected plugins for extra user data and block data */
            // clean from extra user data
            $field_variable = 'dashboard';
            $extra_user_data = UserManager::get_extra_user_data_by_field_variable($field_variable);
            if (!empty($extra_user_data) && count($extra_user_data) > 0) {
                foreach ($extra_user_data as $key => $user_data) {
                    $user_id = $key;
                    $user_block_data = self::get_user_block_data($user_id);
                    $user_block_id = array_keys($user_block_data);

                    // clean disabled block data
                    foreach ($user_block_id as $block_id) {
                        if (in_array($block_id, $not_selected_blocks_id)) {
                            unset($user_block_data[$block_id]);
                        }
                    }

                    // get columns and blocks id for updating extra user data
                    $columns = [];
                    $user_blocks_id = [];
                    foreach ($user_block_data as $data) {
                        $user_blocks_id[$data['block_id']] = true;
                        $columns[$data['block_id']] = $data['column'];
                    }

                    // update extra user blocks data
                    self::store_user_blocks($user_id, $user_blocks_id, $columns);
                }
            }
            // clean from block data
            if (!empty($not_selected_blocks_id)) {
                $sql_check = "SELECT id FROM $tbl_block
                              WHERE id IN(".implode(',', $not_selected_blocks_id).")";
                $rs_check = Database::query($sql_check);
                if (Database::num_rows($rs_check) > 0) {
                    $del = "DELETE FROM $tbl_block WHERE id IN(".implode(',', $not_selected_blocks_id).")";
                    Database::query($del);
                }
            }

            // store selected plugins
            if (!empty($selected_plugins) && count($selected_plugins) > 0) {
                foreach ($selected_plugins as $testplugin) {
                    $selected_path = Database::escape_string($testplugin);

                    // check if the path already stored inside block table for updating or adding it
                    $sql = "SELECT path FROM $tbl_block WHERE path = '$selected_path'";
                    $rs = Database::query($sql);
                    if (Database::num_rows($rs) > 0) {
                        // update
                        $upd = "UPDATE $tbl_block SET active = 1 WHERE path = '$selected_path'";
                        $result = Database::query($upd);
                        $affected_rows = Database::affected_rows($result);
                    } else {
                        // insert
                        $plugin_info_file = $dashboard_pluginpath.$testplugin."/$testplugin.info";
                        $plugin_info = [];
                        if (file_exists($plugin_info_file)) {
                            $plugin_info = api_parse_info_file($plugin_info_file);
                        }

                        // change keys to lower case
                        $plugin_info = array_change_key_case($plugin_info);

                        // setting variables
                        $plugin_name = $testplugin;
                        $plugin_description = '';
                        $plugin_controller = '';
                        $plugin_path = $testplugin;

                        if (isset($plugin_info['name'])) {
                            $plugin_name = Database::escape_string($plugin_info['name']);
                        }
                        if (isset($plugin_info['description'])) {
                            $plugin_description = Database::escape_string($plugin_info['description']);
                        }
                        if (isset($plugin_info['controller'])) {
                            $plugin_controller = Database::escape_string($plugin_info['controller']);
                        }

                        $ins = "INSERT INTO $tbl_block(title, description, path, controller, active)
                               VALUES ('$plugin_name', '$plugin_description', '$plugin_path', '$plugin_controller', 1)";
                        $result = Database::query($ins);
                        $affected_rows = Database::affected_rows($result);
                    }
                }
            }
        }

        return $affected_rows;
    }

    /**
     * Get all plugins path inside Dashboard directory.
     *
     * @return array name plugins directories
     */
    public static function getPossibleDashboardPluginsPath()
    {
        // get all plugins path inside plugin directory
        /* We scan the plugin directory. Each folder is a potential plugin. */
        $possiblePlugins = [];
        $dashboard_pluginpath = api_get_path(SYS_PLUGIN_PATH).'Dashboard/';
        $handle = @opendir($dashboard_pluginpath);
        while (false !== ($file = readdir($handle))) {
            if ('.' != $file && '..' != $file && is_dir($dashboard_pluginpath.$file)) {
                $possiblePlugins[] = $file;
            }
        }
        @closedir($handle);

        return $possiblePlugins;
    }

    /**
     * Get all blocks data without plugin directory.
     *
     * @return array Block data
     */
    public static function get_block_data_without_plugin()
    {
        $tbl_block = Database::get_main_table(TABLE_MAIN_BLOCK);
        $possiblePlugins = self::getPossibleDashboardPluginsPath();

        // We check if plugin exists inside directory for updating active field
        $sql = "SELECT * FROM $tbl_block";
        $rs = Database::query($sql);
        if (Database::num_rows($rs) > 0) {
            while ($row = Database::fetch_array($rs)) {
                if (!in_array($row['path'], $possiblePlugins)) {
                    $active = 0;
                } else {
                    $active = 1;
                }
                // update active
                $upd = "UPDATE $tbl_block SET active = '$active'
                        WHERE path = '".$row['path']."'";
                Database::query($upd);
            }
        }

        // get disabled block data
        $block_data = [];
        $sql = "SELECT * FROM $tbl_block WHERE active = 0";
        $rs_block = Database::query($sql);
        if (Database::num_rows($rs_block) > 0) {
            while ($row_block = Database::fetch_array($rs_block)) {
                if (!isset($row_block['name'])) {
                    $row_block['name'] = $row_block['title'];
                }
                $block_data[] = $row_block;
            }
        }

        return $block_data;
    }

    /**
     * get data about enabled dashboard block (stored insise block table).
     *
     * @param string $path plugin path
     *
     * @return array data
     */
    public static function get_enabled_dashboard_blocks($path = '')
    {
        $tbl_block = Database::get_main_table(TABLE_MAIN_BLOCK);
        $condition_path = '';
        if (!empty($path)) {
            $path = Database::escape_string($path);
            $condition_path = ' AND path = "'.$path.'" ';
        }

        $sql = "SELECT * FROM $tbl_block WHERE active = 1 $condition_path ";
        $rs = Database::query($sql);
        $block_data = [];
        if (Database::num_rows($rs) > 0) {
            while ($row = Database::fetch_array($rs)) {
                $block_data[$row['path']] = $row;
            }
        }

        return $block_data;
    }

    /**
     * display user dashboard list.
     *
     * @param int  User id
     */
    public static function display_user_dashboard_list($user_id)
    {
        $enabled_dashboard_plugins = self::get_enabled_dashboard_blocks();
        $user_block_data = self::get_user_block_data($user_id);
        $html = '';
        if (count($enabled_dashboard_plugins) > 0) {
            $html .= '<div style="margin-top:20px">';
            $html .= '<div><strong>'.get_lang('Select blocks to display in the dashboard blocks view').'</strong></div><br />';
            $html .= '<form name="dashboard_list" method="post" action="index.php?action=store_user_block">';
            $html .= '<table class="data_table">';
            $html .= '<tr>';
            $html .= '<th width="5%">';
            $html .= get_lang('Enabled');
            $html .= '</th>';
            $html .= '<th width="30%">';
            $html .= get_lang('Name');
            $html .= '</th>';
            $html .= '<th width="40%">';
            $html .= get_lang('Description');
            $html .= '</th>';
            $html .= '<th>';
            $html .= get_lang('Position (column)');
            $html .= '</th>';
            $html .= '</tr>';

            // We display all enabled plugins and the checkboxes
            foreach ($enabled_dashboard_plugins as $block) {
                $path = $block['path'];
                $controller_class = $block['controller'];
                $filename_controller = $path.'.class.php';
                $dashboard_plugin_path = api_get_path(SYS_PLUGIN_PATH).'Dashboard/'.$path.'/';
                require_once $dashboard_plugin_path.$filename_controller;
                if (class_exists($controller_class)) {
                    $obj_block = new $controller_class($user_id);

                    // check if user is allowed to see the block
                    if (method_exists($obj_block, 'is_block_visible_for_user')) {
                        $is_block_visible_for_user = $obj_block->is_block_visible_for_user($user_id);
                        if (!$is_block_visible_for_user) {
                            continue;
                        }
                    }

                    $html .= '<tr>';
                    // checkboxes
                    $html .= self::display_user_dashboard_list_checkboxes($user_id, $block['id']);
                    $html .= '<td>'.$block['title'].'</td>';
                    $html .= '<td>'.$block['description'].'</td>';
                    $html .= '<td>
                            <select class="selectpicker show-tick form-control" name="columns['.$block['id'].']">
                            <option value="1" '.(isset($user_block_data[$block['id']]) && 1 == $user_block_data[$block['id']]['column'] ? 'selected' : '').' >1</option>
                            <option value="2" '.(isset($user_block_data[$block['id']]) && 2 == $user_block_data[$block['id']]['column'] ? 'selected' : '').' >2</option>
                            </select>
                          </td>';
                    $html .= '</tr>';
                } else {
                    $html .= Display::tag('tr', Display::tag('td', get_lang('Error').' '.$controller_class, ['colspan' => '3']));
                }
            }

            $html .= '</table>';
            $html .= '<div class="row"><div class="col-md-12">';
            $html .= '<button class="btn btn--plain" type="submit" name="submit_dashboard_list" value="'.get_lang('Enable dashboard block').'"><em class="fa fa-check-square"></em> '.
                get_lang('Enable dashboard block').'</button></form>';
            $html .= '</div></div>';
        } else {
            $html .= '<div style="margin-top:20px">'.get_lang('There is no enabled dashboard plugin').'</div>';
            if (api_is_platform_admin()) {
                $html .= '<a class="btn btn--plain" href="'.api_get_path(WEB_CODE_PATH).'admin/settings.php?category=Plugins">'.
                    get_lang('Configure Dashboard Plugin').'</a>';
            }
        }

        return $html;
    }

    /**
     * display checkboxes for user dashboard list.
     *
     * @param int    User id
     * @param int    Block id
     */
    public static function display_user_dashboard_list_checkboxes($user_id, $block_id)
    {
        $user_id = intval($user_id);
        $user_block_data = self::get_user_block_data($user_id);
        $enabled_blocks_id = array_keys($user_block_data);

        $checked = '';
        if (in_array($block_id, $enabled_blocks_id)) {
            $checked = "checked";
        }

        $html = "<td align=\"center\">";
        $html .= '<input type="checkbox" name="enabled_blocks['.$block_id.']" value="true" '.$checked.'/>';
        $html .= "</td>";

        return $html;
    }

    /**
     * This function store enabled blocks id with its column position (block_id1:colum;block_id2:colum; ...)
     * inside extra user fields.
     *
     * @param int   $user_id        User id
     * @param array $enabled_blocks selected blocks
     * @param array $columns        columns position
     *
     * @return bool
     */
    public static function store_user_blocks($user_id, $enabled_blocks, $columns)
    {
        $selected_blocks_id = [];
        if (is_array($enabled_blocks) && count($enabled_blocks) > 0) {
            $selected_blocks_id = array_keys($enabled_blocks);
        }

        // build data for storing inside extra user field
        $fname = 'dashboard';
        $fvalue = [];
        foreach ($selected_blocks_id as $block_id) {
            $fvalue[] = $block_id.':'.$columns[$block_id];
        }
        $upd_extra_field = UserManager::update_extra_field_value(
            $user_id,
            $fname,
            $fvalue
        );

        return $upd_extra_field;
    }

    /**
     * This function get user block data (block id with its number of column) from extra user data.
     *
     * @param int        User id
     *
     * @return array data (block_id,column)
     */
    public static function get_user_block_data($user_id)
    {
        $user_id = intval($user_id);
        $field_variable = 'dashboard';
        $extra_user_data = UserManager::get_extra_user_data_by_field($user_id, $field_variable);

        if (!isset($extra_user_data[$field_variable])) {
            return [];
        }

        $extra_user_data = explode(';', $extra_user_data[$field_variable]);
        $data = [];
        foreach ($extra_user_data as $extra) {
            $split_extra = explode(':', $extra);
            if (!empty($split_extra)) {
                $block_id = $split_extra[0];
                $column = isset($split_extra[1]) ? $split_extra[1] : null;
                $data[$block_id] = ['block_id' => $block_id, 'column' => $column];
            }
        }

        return $data;
    }

    /**
     * This function update extra user blocks data after closing a dashboard block.
     *
     * @param int $user_id User id
     * @param string    plugin path
     *
     * @return bool
     */
    public static function close_user_block($user_id, $path)
    {
        $enabled_dashboard_blocks = self::get_enabled_dashboard_blocks($path);
        $user_block_data = self::get_user_block_data($user_id);

        foreach ($enabled_dashboard_blocks as $enabled_block) {
            unset($user_block_data[$enabled_block['id']]);
        }

        // get columns and blocks id for updating extra user data
        $columns = [];
        $user_blocks_id = [];
        foreach ($user_block_data as $data) {
            $user_blocks_id[$data['block_id']] = true;
            $columns[$data['block_id']] = $data['column'];
        }

        // update extra user blocks data
        $upd_extra_field = self::store_user_blocks($user_id, $user_blocks_id, $columns);

        return $upd_extra_field;
    }

    /**
     * get links for styles from dashboard plugins.
     *
     * @return string links
     */
    public static function getStyleSheet()
    {
        return '<link rel="stylesheet" href="'.api_get_path(WEB_PLUGIN_PATH).'dashboard/css/default.css" type="text/css" />'.PHP_EOL;
    }
}
