<?php

/**
 * The class to store and manage litespeed db data.
 *
 * @since      	1.3.1
 * @package    	LiteSpeed
 * @subpackage 	LiteSpeed/src
 * @author     	LiteSpeed Technologies <info@litespeedtech.com>
 */

namespace LiteSpeed;

defined('WPINC') || exit();

class Data extends Root
{
	const LOG_TAG = '[Data]';

	private $_db_updater = array(
		'3.5.0.3' => array('litespeed_update_3_5'),
		'4.0' => array('litespeed_update_4'),
		'4.1' => array('litespeed_update_4_1'),
		'4.3' => array('litespeed_update_4_3'),
		'4.4.4-b1' => array('litespeed_update_4_4_4'),
		'5.3-a5' => array('litespeed_update_5_3'),
	);

	private $_db_site_updater = array(
		// Example
		// '2.0'	=> array(
		// 	'litespeed_update_site_2_0',
		// ),
	);

	private $_url_file_types = array(
		'css' => 1,
		'js' => 2,
		'ccss' => 3,
		'ucss' => 4,
	);

	const TB_IMG_OPTM = 'litespeed_img_optm';
	const TB_IMG_OPTMING = 'litespeed_img_optming'; // working table
	const TB_AVATAR = 'litespeed_avatar';
	const TB_CRAWLER = 'litespeed_crawler';
	const TB_CRAWLER_BLACKLIST = 'litespeed_crawler_blacklist';
	const TB_URL = 'litespeed_url';
	const TB_URL_FILE = 'litespeed_url_file';

	/**
	 * Init
	 *
	 * @since  1.3.1
	 */
	public function __construct()
	{
	}

	/**
	 * Correct table existence
	 *
	 * Call when activate -> update_confs()
	 * Call when update_confs()
	 *
	 * @since  3.0
	 * @access public
	 */
	public function correct_tb_existence()
	{
		// Gravatar
		if ($this->conf(Base::O_DISCUSS_AVATAR_CACHE)) {
			$this->tb_create('avatar');
		}

		// Crawler
		if ($this->conf(Base::O_CRAWLER)) {
			$this->tb_create('crawler');
			$this->tb_create('crawler_blacklist');
		}

		// URL mapping
		$this->tb_create('url');
		$this->tb_create('url_file');

		// Image optm is a bit different. Only trigger creation when sending requests. Drop when destroying.
	}

	/**
	 * Upgrade conf to latest format version from previous versions
	 *
	 * NOTE: Only for v3.0+
	 *
	 * @since 3.0
	 * @access public
	 */
	public function conf_upgrade($ver)
	{
		// Skip count check if `Use Primary Site Configurations` is on
		// Deprecated since v3.0 as network primary site didn't override the subsites conf yet
		// if ( ! is_main_site() && ! empty ( $this->_site_options[ self::NETWORK_O_USE_PRIMARY ] ) ) {
		// 	return;
		// }

		if ($this->_get_upgrade_lock()) {
			return;
		}

		$this->_set_upgrade_lock(true);

		require_once LSCWP_DIR . 'src/data.upgrade.func.php';

		// Init log manually
		if ($this->conf(Base::O_DEBUG)) {
			$this->cls('Debug2')->init();
		}

		foreach ($this->_db_updater as $k => $v) {
			if (version_compare($ver, $k, '<')) {
				// run each callback
				foreach ($v as $v2) {
					Debug2::debug("[Data] Updating [ori_v] $ver \t[to] $k \t[func] $v2");
					call_user_func($v2);
				}
			}
		}

		// Reload options
		$this->cls('Conf')->load_options();

		$this->correct_tb_existence();

		// Update related files
		$this->cls('Activation')->update_files();

		// Update version to latest
		Conf::delete_option(Base::_VER);
		Conf::add_option(Base::_VER, Core::VER);

		Debug2::debug('[Data] Updated version to ' . Core::VER);

		$this->_set_upgrade_lock(false);

		!defined('LSWCP_EMPTYCACHE') && define('LSWCP_EMPTYCACHE', true); // clear all sites caches
		Purge::purge_all();

		Cloud::version_check('upgrade');
	}

	/**
	 * Upgrade site conf to latest format version from previous versions
	 *
	 * NOTE: Only for v3.0+
	 *
	 * @since 3.0
	 * @access public
	 */
	public function conf_site_upgrade($ver)
	{
		if ($this->_get_upgrade_lock()) {
			return;
		}

		$this->_set_upgrade_lock(true);

		require_once LSCWP_DIR . 'src/data.upgrade.func.php';

		foreach ($this->_db_site_updater as $k => $v) {
			if (version_compare($ver, $k, '<')) {
				// run each callback
				foreach ($v as $v2) {
					Debug2::debug("[Data] Updating site [ori_v] $ver \t[to] $k \t[func] $v2");
					call_user_func($v2);
				}
			}
		}

		// Reload options
		$this->cls('Conf')->load_site_options();

		Conf::delete_site_option(Base::_VER);
		Conf::add_site_option(Base::_VER, Core::VER);

		Debug2::debug('[Data] Updated site_version to ' . Core::VER);

		$this->_set_upgrade_lock(false);

		!defined('LSWCP_EMPTYCACHE') && define('LSWCP_EMPTYCACHE', true); // clear all sites caches
		Purge::purge_all();
	}

	/**
	 * Check if upgrade script is running or not
	 *
	 * @since 3.0.1
	 */
	private function _get_upgrade_lock()
	{
		$is_upgrading = get_option('litespeed.data.upgrading');
		if (!$is_upgrading) {
			$this->_set_upgrade_lock(false); // set option value to existed to avoid repeated db query next time
		}
		if ($is_upgrading && time() - $is_upgrading < 3600) {
			return $is_upgrading;
		}

		return false;
	}

	/**
	 * Show the upgrading banner if upgrade script is running
	 *
	 * @since 3.0.1
	 */
	public function check_upgrading_msg()
	{
		$is_upgrading = $this->_get_upgrade_lock();
		if (!$is_upgrading) {
			return;
		}

		Admin_Display::info(
			sprintf(
				__('The database has been upgrading in the background since %s. This message will disappear once upgrade is complete.', 'litespeed-cache'),
				'<code>' . Utility::readable_time($is_upgrading) . '</code>'
			) . ' [LiteSpeed]',
			true
		);
	}

	/**
	 * Set lock for upgrade process
	 *
	 * @since 3.0.1
	 */
	private function _set_upgrade_lock($lock)
	{
		if (!$lock) {
			update_option('litespeed.data.upgrading', -1);
		} else {
			update_option('litespeed.data.upgrading', time());
		}
	}

	/**
	 * Upgrade the conf to v3.0 from previous v3.0- data
	 *
	 * NOTE: Only for v3.0-
	 *
	 * @since 3.0
	 * @access public
	 */
	public function try_upgrade_conf_3_0()
	{
		$previous_options = get_option('litespeed-cache-conf');
		if (!$previous_options) {
			Cloud::version_check('new');
			return;
		}

		$ver = $previous_options['version'];

		!defined('LSCWP_CUR_V') && define('LSCWP_CUR_V', $ver);

		// Init log manually
		if ($this->conf(Base::O_DEBUG)) {
			$this->cls('Debug2')->init();
		}
		Debug2::debug('[Data] Upgrading previous settings [from] ' . $ver . ' [to] v3.0');

		if ($this->_get_upgrade_lock()) {
			return;
		}

		$this->_set_upgrade_lock(true);

		require_once LSCWP_DIR . 'src/data.upgrade.func.php';

		// Here inside will update the version to v3.0
		litespeed_update_3_0($ver);

		$this->_set_upgrade_lock(false);

		Debug2::debug('[Data] Upgraded to v3.0');

		// Upgrade from 3.0 to latest version
		$ver = '3.0';
		if (Core::VER != $ver) {
			$this->conf_upgrade($ver);
		} else {
			// Reload options
			$this->cls('Conf')->load_options();

			$this->correct_tb_existence();

			!defined('LSWCP_EMPTYCACHE') && define('LSWCP_EMPTYCACHE', true); // clear all sites caches
			Purge::purge_all();

			Cloud::version_check('upgrade');
		}
	}

	/**
	 * Get the table name
	 *
	 * @since  3.0
	 * @access public
	 */
	public function tb($tb)
	{
		global $wpdb;

		switch ($tb) {
			case 'img_optm':
				return $wpdb->prefix . self::TB_IMG_OPTM;
				break;

			case 'img_optming':
				return $wpdb->prefix . self::TB_IMG_OPTMING;
				break;

			case 'avatar':
				return $wpdb->prefix . self::TB_AVATAR;
				break;

			case 'crawler':
				return $wpdb->prefix . self::TB_CRAWLER;
				break;

			case 'crawler_blacklist':
				return $wpdb->prefix . self::TB_CRAWLER_BLACKLIST;
				break;

			case 'url':
				return $wpdb->prefix . self::TB_URL;
				break;

			case 'url_file':
				return $wpdb->prefix . self::TB_URL_FILE;
				break;

			default:
				break;
		}
	}

	/**
	 * Check if one table exists or not
	 *
	 * @since  3.0
	 * @access public
	 */
	public function tb_exist($tb)
	{
		global $wpdb;
		return $wpdb->get_var("SHOW TABLES LIKE '" . $this->tb($tb) . "'");
	}

	/**
	 * Get data structure of one table
	 *
	 * @since  2.0
	 * @access private
	 */
	private function _tb_structure($tb)
	{
		return File::read(LSCWP_DIR . 'src/data_structure/' . $tb . '.sql');
	}

	/**
	 * Create img optm table and sync data from wp_postmeta
	 *
	 * @since  3.0
	 * @access public
	 */
	public function tb_create($tb)
	{
		global $wpdb;

		Debug2::debug2('[Data] Checking table ' . $tb);

		// Check if table exists first
		if ($this->tb_exist($tb)) {
			Debug2::debug2('[Data] Existed');
			return;
		}

		Debug2::debug('[Data] Creating ' . $tb);

		$sql = sprintf(
			'CREATE TABLE IF NOT EXISTS `%1$s` (' . $this->_tb_structure($tb) . ') %2$s;',
			$this->tb($tb),
			$wpdb->get_charset_collate() // 'DEFAULT CHARSET=utf8'
		);

		$res = $wpdb->query($sql);
		if ($res !== true) {
			Debug2::debug('[Data] Warning! Creating table failed!', $sql);
			Admin_Display::error(Error::msg('failed_tb_creation', array('<code>' . $tb . '</code>', '<code>' . $sql . '</code>')));
		}
	}

	/**
	 * Drop table
	 *
	 * @since  3.0
	 * @access public
	 */
	public function tb_del($tb)
	{
		global $wpdb;

		if (!$this->tb_exist($tb)) {
			return;
		}

		Debug2::debug('[Data] Deleting table ' . $tb);

		$q = 'DROP TABLE IF EXISTS ' . $this->tb($tb);
		$wpdb->query($q);
	}

	/**
	 * Drop generated tables
	 *
	 * @since  3.0
	 * @access public
	 */
	public function tables_del()
	{
		$this->tb_del('avatar');
		$this->tb_del('crawler');
		$this->tb_del('crawler_blacklist');
		$this->tb_del('url');
		$this->tb_del('url_file');

		// Deleting img_optm only can be done when destroy all optm images
	}

	/**
	 * Keep table but clear all data
	 *
	 * @since  4.0
	 */
	public function table_truncate($tb)
	{
		global $wpdb;
		$q = 'TRUNCATE TABLE ' . $this->tb($tb);
		$wpdb->query($q);
	}

	/**
	 * Clean certain type of url_file
	 *
	 * @since  4.0
	 */
	public function url_file_clean($file_type)
	{
		global $wpdb;

		if (!$this->tb_exist('url_file')) {
			return;
		}

		$type = $this->_url_file_types[$file_type];
		$q = 'DELETE FROM ' . $this->tb('url_file') . ' WHERE `type` = %d';
		$wpdb->query($wpdb->prepare($q, $type));

		// Added to cleanup url table. See issue: https://wordpress.org/support/topic/wp_litespeed_url-1-1-gb-in-db-huge-big/
		$wpdb->query(
			'DELETE d
			FROM `' .
				$this->tb('url') .
				'` AS d
			LEFT JOIN `' .
				$this->tb('url_file') .
				'` AS f ON d.`id` = f.`url_id`
			WHERE f.`url_id` IS NULL'
		);
	}

	/**
	 * Generate filename based on URL, if content md5 existed, reuse existing file.
	 * @since  4.0
	 */
	public function save_url($request_url, $vary, $file_type, $filecon_md5, $path, $mobile = false, $webp = false)
	{
		global $wpdb;

		if (strlen($vary) > 32) {
			$vary = md5($vary);
		}

		$type = $this->_url_file_types[$file_type];

		$tb_url = $this->tb('url');
		$tb_url_file = $this->tb('url_file');
		$q = "SELECT * FROM `$tb_url` WHERE url=%s";
		$url_row = $wpdb->get_row($wpdb->prepare($q, $request_url), ARRAY_A);
		if (!$url_row) {
			$q = "INSERT INTO `$tb_url` SET url=%s";
			$wpdb->query($wpdb->prepare($q, $request_url));
			$url_id = $wpdb->insert_id;
		} else {
			$url_id = $url_row['id'];
		}

		$q = "SELECT * FROM `$tb_url_file` WHERE url_id=%d AND vary=%s AND type=%d AND expired=0";
		$file_row = $wpdb->get_row($wpdb->prepare($q, array($url_id, $vary, $type)), ARRAY_A);

		// Check if has previous file or not
		if ($file_row && $file_row['filename'] == $filecon_md5) {
			return;
		}

		// If the new $filecon_md5 is marked as expired by previous records, clear those records
		$q = "DELETE FROM `$tb_url_file` WHERE filename = %s AND expired > 0";
		$wpdb->query($wpdb->prepare($q, $filecon_md5));

		// Check if there is any other record used the same filename or not
		$q = "SELECT id FROM `$tb_url_file` WHERE filename = %s AND expired = 0 AND id != %d LIMIT 1";
		if ($file_row && $wpdb->get_var($wpdb->prepare($q, array($file_row['filename'], $file_row['id'])))) {
			$q = "UPDATE `$tb_url_file` SET filename=%s WHERE id=%d";
			$wpdb->query($wpdb->prepare($q, array($filecon_md5, $file_row['id'])));
			return;
		}

		// New record needed
		$q = "INSERT INTO `$tb_url_file` SET url_id=%d, vary=%s, filename=%s, type=%d, mobile=%d, webp=%d, expired=0";
		$wpdb->query($wpdb->prepare($q, array($url_id, $vary, $filecon_md5, $type, $mobile ? 1 : 0, $webp ? 1 : 0)));

		// Mark existing rows as expired
		if ($file_row) {
			$q = "UPDATE `$tb_url_file` SET expired=%d WHERE id=%d";
			$expired = time() + 86400 * apply_filters('litespeed_url_file_expired_days', 20);
			$wpdb->query($wpdb->prepare($q, array($expired, $file_row['id'])));

			// Also check if has other files expired already to be deleted
			$q = "SELECT * FROM `$tb_url_file` WHERE url_id = %d AND expired BETWEEN 1 AND %d";
			$q = $wpdb->prepare($q, array($url_id, time()));
			$list = $wpdb->get_results($q, ARRAY_A);
			if ($list) {
				foreach ($list as $v) {
					$file_to_del = $path . '/' . $v['filename'] . '.' . ($file_type == 'js' ? 'js' : 'css');
					if (file_exists($file_to_del)) {
						// Safe to delete
						Debug2::debug('[Data] Delete expired unused file: ' . $file_to_del);

						// Clear related lscache first to avoid cache copy of same URL w/ diff QS
						// Purge::add( Tag::TYPE_MIN . '.' . $file_row[ 'filename' ] . '.' . $file_type );

						unlink($file_to_del);
					}
				}
				$q = "DELETE FROM `$tb_url_file` WHERE url_id = %d AND expired BETWEEN 1 AND %d";
				$wpdb->query($wpdb->prepare($q, array($url_id, time())));
			}
		}

		// Purge this URL to avoid cache copy of same URL w/ diff QS
		// $this->cls( 'Purge' )->purge_url( Utility::make_relative( $request_url ) ?: '/', true, true );
	}

	/**
	 * Load CCSS related file
	 * @since  4.0
	 */
	public function load_url_file($request_url, $vary, $file_type)
	{
		global $wpdb;

		if (strlen($vary) > 32) {
			$vary = md5($vary);
		}

		$type = $this->_url_file_types[$file_type];

		self::debug2('load url file: ' . $request_url);

		$tb_url = $this->tb('url');
		$q = "SELECT * FROM `$tb_url` WHERE url=%s";
		$url_row = $wpdb->get_row($wpdb->prepare($q, $request_url), ARRAY_A);
		if (!$url_row) {
			return false;
		}

		$url_id = $url_row['id'];

		$tb_url_file = $this->tb('url_file');
		$q = "SELECT * FROM `$tb_url_file` WHERE url_id=%d AND vary=%s AND type=%d AND expired=0";
		$file_row = $wpdb->get_row($wpdb->prepare($q, array($url_id, $vary, $type)), ARRAY_A);
		if (!$file_row) {
			return false;
		}

		return $file_row['filename'];
	}

	/**
	 * Mark all entries of one URL to expired
	 * @since 4.5
	 */
	public function mark_as_expired($request_url, $auto_q = false)
	{
		global $wpdb;
		$tb_url = $this->tb('url');

		Debug2::debug('[Data] Try to mark as expired: ' . $request_url);
		$q = "SELECT * FROM `$tb_url` WHERE url=%s";
		$url_row = $wpdb->get_row($wpdb->prepare($q, $request_url), ARRAY_A);
		if (!$url_row) {
			return;
		}

		Debug2::debug('[Data] Mark url_id=' . $url_row['id'] . ' as expired');

		$tb_url_file = $this->tb('url_file');

		$existing_url_files = array();
		if ($auto_q) {
			$q = "SELECT a.*, b.url FROM `$tb_url_file` a LEFT JOIN `$tb_url` b ON b.id=a.url_id WHERE a.url_id=%d AND a.type=4 AND a.expired=0";
			$q = $wpdb->prepare($q, $url_row['id']);
			$existing_url_files = $wpdb->get_results($q, ARRAY_A);
		}
		$q = "UPDATE `$tb_url_file` SET expired=%d WHERE url_id=%d AND type=4 AND expired=0";
		$expired = time() + 86400 * apply_filters('litespeed_url_file_expired_days', 20);
		$wpdb->query($wpdb->prepare($q, array($expired, $url_row['id'])));

		return $existing_url_files;
	}

	/**
	 * Get list from `data/css_excludes.txt`
	 *
	 * @since  3.6
	 */
	public function load_css_exc($list)
	{
		$data = $this->_load_per_line('css_excludes.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/ucss_whitelist.txt`
	 *
	 * @since  4.0
	 */
	public function load_ucss_whitelist($list)
	{
		$data = $this->_load_per_line('ucss_whitelist.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/js_excludes.txt`
	 *
	 * @since  3.5
	 */
	public function load_js_exc($list)
	{
		$data = $this->_load_per_line('js_excludes.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/js_defer_excludes.txt`
	 *
	 * @since  3.6
	 */
	public function load_js_defer_exc($list)
	{
		$data = $this->_load_per_line('js_defer_excludes.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/optm_uri_exc.txt`
	 *
	 * @since  5.4
	 */
	public function load_optm_uri_exc($list)
	{
		$data = $this->_load_per_line('optm_uri_exc.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/esi.nonces.txt`
	 *
	 * @since  3.5
	 */
	public function load_esi_nonces($list)
	{
		$data = $this->_load_per_line('esi.nonces.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Get list from `data/cache_nocacheable.txt`
	 *
	 * @since  6.3.0.1
	 */
	public function load_cache_nocacheable($list)
	{
		$data = $this->_load_per_line('cache_nocacheable.txt');
		if ($data) {
			$list = array_unique(array_filter(array_merge($list, $data)));
		}

		return $list;
	}

	/**
	 * Load file per line
	 *
	 * Support two kinds of comments:
	 * 		1. `# this is comment`
	 * 		2. `##this is comment`
	 *
	 * @since  3.5
	 */
	private function _load_per_line($file)
	{
		$data = File::read(LSCWP_DIR . 'data/' . $file);
		$data = explode(PHP_EOL, $data);
		$list = array();
		foreach ($data as $v) {
			// Drop two kinds of comments
			if (strpos($v, '##') !== false) {
				$v = trim(substr($v, 0, strpos($v, '##')));
			}
			if (strpos($v, '# ') !== false) {
				$v = trim(substr($v, 0, strpos($v, '# ')));
			}

			if (!$v) {
				continue;
			}

			$list[] = $v;
		}

		return $list;
	}
}