<?php

class WPML_TM_Blog_Translators {

	/** @var WPML_TM_Records $tm_records */
	private $tm_records;

	/**
	 * @var SitePress;
	 */
	private $sitepress;

	/** @var WPML_Translator_Records $translator_records */
	private $translator_records;

	/** @var  WPML_Cache_Factory */
	private $cache_factory;

	/**
	 * @param SitePress               $sitepress
	 * @param WPML_TM_Records         $tm_records
	 * @param WPML_Translator_Records $translator_records
	 * @param WPML_Cache_Factory      $cache_factory
	 */
	public function __construct(
		SitePress $sitepress,
		WPML_TM_Records $tm_records,
		WPML_Translator_Records $translator_records,
		WPML_Cache_Factory $cache_factory
	) {
		$this->sitepress          = $sitepress;
		$this->tm_records         = $tm_records;
		$this->translator_records = $translator_records;
		$this->cache_factory      = $cache_factory;
	}

	/**
	 * It returns true if the site has translators.
	 *
	 * @return bool
	 */
	public function has_translators() {
		$cache = $this->cache_factory->get( 'WPML_TM_Blog_Translators::has_translators' );

		return $cache->execute_and_cache(
			'has-translators',
			function () {
				return $this->translator_records->has_users_with_capability();
			}
		);
	}

	/**
	 * @param array $args
	 *
	 * @return array
	 */
	function get_blog_translators( $args = array() ) {
		$from = isset( $args['from'] ) ? $args['from'] : false;
		$to   = isset( $args['to'] ) ? $args['to'] : false;

		$all_translators = $this->get_raw_blog_translators();
		$translators     = array();

		foreach ( $all_translators as $key => $translator ) {
			if ( ! $from || ! $to ) {
				$translators[] = isset( $translator->data ) ? $translator->data : $translator;
			} elseif ( $this->translator_has_language_pair( $translator->ID, $from, $to ) ) {
				$translators[] = isset( $translator->data ) ? $translator->data : $translator;
			}
		}

		return apply_filters( 'blog_translators', $translators, $args );
	}

	/**
	 * @param int    $translator_id
	 * @param string $from
	 * @param string $to
	 *
	 * @return bool
	 */
	private function translator_has_language_pair( $translator_id, $from, $to ) {
		$language_pairs = $this->get_language_pairs( $translator_id );

		if ( isset( $language_pairs[ $from ][ $to ] ) && (bool) $language_pairs[ $from ][ $to ] ) {
			return true;
		}

		return false;
	}

	/**
	 * @return array
	 */
	public function get_raw_blog_translators() {
		$cache = $this->cache_factory->get( 'WPML_TM_Blog_Translators::get_raw_blog_translators' );

		return $cache->execute_and_cache(
			'has-translators',
			function () {
				return $this->translator_records->get_users_with_capability();
			}
		);
	}

	/**
	 * @param int   $user_id
	 * @param array $args
	 *
	 * @return bool
	 */
	function is_translator( $user_id, $args = array() ) {
		$defaults = [
			'lang_from'      => null,
			'lang_to'        => null,
			'job_id'         => null,
			'post_id'        => null,
			'admin_override' => true,
		];
		$args     = array_merge( $defaults, $args );

		$lang_from      = $args['lang_from'];
		$lang_to        = $args['lang_to'];
		$job_id         = $args['job_id'];
		$admin_override = $args['admin_override'];

		$is_translator = $this->sitepress->get_wp_api()
										 ->user_can( $user_id, 'translate' );
		// check if user is administrator and return true if he is
		if ( $admin_override && $this->sitepress->get_wp_api()
												->user_can( $user_id, 'manage_options' )
		) {
			$is_translator = true;
			do_action( 'wpml_tm_ate_enable_subscription', $user_id );
		} else {
			if ( $lang_from && $lang_to ) {
				$user_language_pairs = $this->get_language_pairs( $user_id );
				if ( ! empty( $user_language_pairs ) ) {
					foreach ( $user_language_pairs as $user_lang_from => $user_lang_to ) {
						if ( array_key_exists( $lang_to, $user_lang_to ) ) {
							$is_translator = true;
							break;
						} else {
							$is_translator = false;
						}
					}
				} else {
					$is_translator = false;
				}
			}
			if ( $job_id ) {
				$job_record    = $this->tm_records->icl_translate_job_by_job_id( $job_id );
				$translator_id = in_array(
					$job_record->service(),
					array(
						'local',
						0,
					)
				) ? $job_record->translator_id() : - 1;
				$is_translator = $translator_id == $user_id
								 || ( $is_translator && empty( $translator_id ) );
			}
		}

		return apply_filters( 'wpml_override_is_translator', $is_translator, $user_id, $args );
	}

	/**
	 * @param int $user_id
	 *
	 * @return array
	 */
	public function get_language_pairs( $user_id ) {

		return $this->sitepress->get_wp_api()
							->get_user_meta(
								$user_id,
								$this->sitepress->wpdb()->prefix . 'language_pairs',
								true
							);
	}
}