<?php
/**
 * Main class of the plugin.
 *
 * @package cyr-to-lat
 */

/**
 * Class Cyr_To_Lat_Main
 */
class Cyr_To_Lat_Main {

	/**
	 * Regex of prohibited chars in slugs
	 * [^A-Za-z0-9[.apostrophe.][.underscore.][.period.][.hyphen.]]+
	 *
	 * @link https://dev.mysql.com/doc/refman/5.6/en/regexp.html
	 */
	const PROHIBITED_CHARS_REGEX = "[^A-Za-z0-9'_\.\-]";

	/**
	 * Plugin settings.
	 *
	 * @var Cyr_To_Lat_Settings
	 */
	private $settings;

	/**
	 * Converter instance.
	 *
	 * @var Cyr_To_Lat_Converter
	 */
	private $converter;

	/**
	 * WP-CLI
	 *
	 * @var Cyr_To_Lat_WP_CLI
	 */
	private $cli;

	/**
	 * Cyr_To_Lat_Main constructor.
	 *
	 * @param Cyr_To_Lat_Settings  $settings  Plugin settings.
	 * @param Cyr_To_Lat_Converter $converter Converter instance.
	 * @param Cyr_To_Lat_WP_CLI    $cli       CLI instance.
	 */
	public function __construct( $settings = null, $converter = null, $cli = null ) {
		$this->settings = $settings;
		if ( ! $this->settings ) {
			$this->settings = new Cyr_To_Lat_Settings();
		}

		$this->converter = $converter;
		if ( ! $this->converter ) {
			$this->converter = new Cyr_To_Lat_Converter( $this, $this->settings );
		}

		$this->cli = $cli;
		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			if ( ! $this->cli ) {
				$this->cli = new Cyr_To_Lat_WP_CLI( $this->converter );
			}
		}

		$this->init();
	}

	/**
	 * Init class.
	 */
	public function init() {
		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			try {
				/**
				 * Method WP_CLI::add_command() accepts class as callable.
				 *
				 * @noinspection PhpParamsInspection
				 */
				WP_CLI::add_command( 'cyr2lat', $this->cli );
			} catch ( Exception $e ) {
				return;
			}
		}

		$this->init_hooks();
	}

	/**
	 * Init class hooks.
	 */
	public function init_hooks() {
		add_filter( 'sanitize_title', array( $this, 'ctl_sanitize_title' ), 9, 3 );
		add_filter( 'sanitize_file_name', array( $this, 'ctl_sanitize_title' ), 10, 2 );
		add_filter( 'wp_insert_post_data', array( $this, 'ctl_sanitize_post_name' ), 10, 2 );
	}

	/**
	 * Sanitize title.
	 *
	 * @param string $title     Sanitized title.
	 * @param string $raw_title The title prior to sanitization.
	 * @param string $context   The context for which the title is being sanitized.
	 *
	 * @return string
	 */
	public function ctl_sanitize_title( $title, $raw_title = '', $context = '' ) {
		global $wpdb;

		// Fixed bug with `_wp_old_slug` redirect.
		if ( 'query' === $context ) {
			return $title;
		}

		$title = urldecode( $title );
		$pre   = apply_filters( 'ctl_pre_sanitize_title', false, $title );

		if ( false !== $pre ) {
			return $pre;
		}

		// List of locales: https://make.wordpress.org/polyglots/teams/.
		$locale = get_locale();
		$table  = $this->settings->get_option( $locale );
		$table  = ! empty( $table ) ? $table : $this->settings->get_option( 'iso9' );

		$is_term = false;
		// phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace
		$backtrace = debug_backtrace();
		// phpcs:enable
		foreach ( $backtrace as $backtrace_entry ) {
			if ( 'wp_insert_term' === $backtrace_entry['function'] ) {
				$is_term = true;
				break;
			}
		}

		// phpcs:disable WordPress.DB.DirectDatabaseQuery
		$term = $is_term ? $wpdb->get_var( $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE name = %s", $title ) ) : '';
		// phpcs:enable

		if ( ! empty( $term ) ) {
			$title = $term;
		} else {
			$title = strtr( $title, apply_filters( 'ctl_table', $table ) );

			if ( function_exists( 'iconv' ) ) {
				$title = iconv( 'UTF-8', 'UTF-8//TRANSLIT//IGNORE', $title );
			}
		}

		return $title;
	}

	/**
	 * Helper function to make class unit-testable
	 *
	 * @param string $function Function name.
	 *
	 * @return bool
	 */
	protected function ctl_function_exists( $function ) {
		return function_exists( $function );
	}

	/**
	 * Check if Classic Editor plugin is active.
	 *
	 * @link https://kagg.eu/how-to-catch-gutenberg/
	 *
	 * @return bool
	 */
	private function ctl_is_classic_editor_plugin_active() {
		if ( ! $this->ctl_function_exists( 'is_plugin_active' ) ) {
			include_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		return is_plugin_active( 'classic-editor/classic-editor.php' );
	}

	/**
	 * Check if Block Editor is active.
	 * Must only be used after plugins_loaded action is fired.
	 *
	 * @link https://kagg.eu/how-to-catch-gutenberg/
	 *
	 * @return bool
	 */
	private function ctl_is_gutenberg_editor_active() {

		// Gutenberg plugin is installed and activated.
		$gutenberg = ! ( false === has_filter( 'replace_editor', 'gutenberg_init' ) );

		// Block editor since 5.0.
		$block_editor = version_compare( $GLOBALS['wp_version'], '5.0-beta', '>' );

		if ( ! $gutenberg && ! $block_editor ) {
			return false;
		}

		if ( $this->ctl_is_classic_editor_plugin_active() ) {
			$editor_option       = get_option( 'classic-editor-replace' );
			$block_editor_active = array( 'no-replace', 'block' );

			return in_array( $editor_option, $block_editor_active, true );
		}

		return true;
	}

	/**
	 * Gutenberg support
	 *
	 * @param array $data    An array of slashed post data.
	 * @param array $postarr An array of sanitized, but otherwise unmodified post data.
	 *
	 * @return mixed
	 */
	public function ctl_sanitize_post_name( $data, $postarr = array() ) {
		global $current_screen;

		if ( ! $this->ctl_is_gutenberg_editor_active() ) {
			return $data;
		}

		// Run code only on post edit screen.
		if ( ! ( $current_screen && 'post' === $current_screen->base ) ) {
			return $data;
		}

		if (
			! $data['post_name'] && $data['post_title'] &&
			! in_array( $data['post_status'], array( 'auto-draft', 'revision' ), true )
		) {
			$data['post_name'] = sanitize_title( $data['post_title'] );
		}

		return $data;
	}

	/**
	 * Changes array of items into string of items, separated by comma and sql-escaped
	 *
	 * @see https://coderwall.com/p/zepnaw
	 * @global wpdb       $wpdb
	 *
	 * @param mixed|array $items  item(s) to be joined into string.
	 * @param string      $format %s or %d.
	 *
	 * @return string Items separated by comma and sql-escaped
	 */
	public function ctl_prepare_in( $items, $format = '%s' ) {
		global $wpdb;

		$items    = (array) $items;
		$how_many = count( $items );
		if ( $how_many > 0 ) {
			$placeholders    = array_fill( 0, $how_many, $format );
			$prepared_format = implode( ',', $placeholders );
			$prepared_in     = $wpdb->prepare( $prepared_format, $items ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
		} else {
			$prepared_in = '';
		}

		return $prepared_in;
	}
}

// eof.