<?php
class WPML_ACF_Worker {
	/**
	 * @var WPML_ACF_Duplicated_Post
	 */
	private $duplicated_post;

	/**
	 * WPML_ACF_Worker constructor.
	 *
	 * @param WPML_ACF_Duplicated_Post $duplicated_post
	 */
	public function __construct( WPML_ACF_Duplicated_Post $duplicated_post ) {
		$this->duplicated_post = $duplicated_post;
		$this->register_hooks();
	}

	/**
	 * Registers WP hooks.
	 */
	public function register_hooks() {
		add_filter('wpml_duplicate_generic_string', array($this, 'duplicate_post_meta'), 10, 3);
		add_filter('wpml_sync_parent_for_post_type', array($this, 'sync_parent_for_post_type'), 10, 2);
		add_action('wpml_after_copy_custom_field', array($this, 'after_copy_custom_field'), 10, 3);
		add_filter( 'wpml_sync_custom_field_copied_value', [ $this, 'sync_custom_field_copied_value' ], 10, 4 );
	}

	/**
	 * When custom field has been copied, adjusts its values to represent translated objects.
	 *
	 * @param int    $post_id_from The ID of the original post.
	 * @param int    $post_id_to   The ID of translated post.
	 * @param string $meta_key     The meta key of copied custom field.
	 */
	public function after_copy_custom_field($post_id_from, $post_id_to, $meta_key) {
		$field = acf_get_field( $meta_key );
		if ( $field ) {
			$meta_value  = get_post_meta( $post_id_to, $meta_key, true );
			$target_lang = $this->get_target_lang( $post_id_to );
			if ( $target_lang ) {
				$meta_data            = $this->prepare_metadata( $meta_value, $meta_key, $post_id_from, $post_id_to );
				$meta_value_converted = $this->duplicate_post_meta( $meta_value, $target_lang, $meta_data );
				if ( $meta_value !== $meta_value_converted ) {
					update_post_meta( $post_id_to, $meta_key, $meta_value_converted, $meta_value );
				}
			}
		}
	}

	/**
	 * Synchronizes ACF field value during the post duplicate process.
	 *
	 * @param mixed  $meta_value  ACF value being copied.
	 * @param string $target_lang The target language.
	 * @param array  $meta_data   Meta data of the value.
	 *
	 * @return mixed
	 */
	public function duplicate_post_meta($meta_value, $target_lang, $meta_data) {
		$processed_data = new WPML_ACF_Processed_Data($meta_value, $target_lang, $meta_data);
		return $this->convertMetaValue( $processed_data );
	}

	/**
	 * Synchronizes ACF field copied value when it comes from Translation Services.
	 *
	 * @param mixed  $copiedValue Value being copied.
	 * @param int    $postIdFrom  ID of original post.
	 * @param int    $postIdTo    ID of translated post.
	 * @param string $metaKey     ACF field key.
	 *
	 * @return mixed
	 */
	public function sync_custom_field_copied_value( $copiedValue, $postIdFrom, $postIdTo, $metaKey ) {
		if ( $this->isApplyTranslationsRequest() ) {
			$metaData      = $this->prepare_metadata( $copiedValue, $metaKey, $postIdFrom, $postIdTo );
			$processedData = new WPML_ACF_Processed_Data( $copiedValue, $this->get_target_lang( $postIdTo ), $metaData );
			return $this->convertMetaValue( $processedData );
		}
		return $copiedValue;
	}

	/**
	 * Converts IDs and stuff inside ACF field value.
	 *
	 * @param WPML_ACF_Processed_Data $processedData The data being processed.
	 *
	 * @return mixed
	 */
	private function convertMetaValue( WPML_ACF_Processed_Data $processedData ) {
		$field = $this->duplicated_post->resolve_field( $processedData );
		return $field->convert_ids();
	}

	public function sync_parent_for_post_type($sync, $post_type) {
		if ("acf-field" == $post_type || "acf-field-group" == $post_type) {
			$sync = false;
		}

		return $sync;
	}

	/**
	 * Prepares metadata to has the same format as used in \WPML_Post_Duplication::duplicate_custom_fields.
	 *
	 * @see \WPML_Post_Duplication::duplicate_custom_fields
	 *
	 * @param string $meta_value   The meta value of processed custom field.
	 * @param string $meta_key     The meta key of processed custom field.
	 * @param int    $post_id_from The ID of original post.
	 * @param int    $post_id_to   The ID of translated post.
	 *
	 * @return array The metadata.
	 */
	public function prepare_metadata( $meta_value, $meta_key, $post_id_from, $post_id_to ) {
		$is_serialized = is_serialized( $meta_value );
		return [
			'context'        => 'custom_field',
			'attribute'      => 'value',
			'key'            => $meta_key,
			'is_serialized'  => $is_serialized,
			'post_id'        => $post_id_to,
			'master_post_id' => $post_id_from,
		];
	}

	/**
	 * Returns target language code.
	 *
	 * First tries to take it from wpml_element_langauge_code, if it fails check if language code is stored in the
	 * $_POST data (as it happens when post is translated as part of translation job on CTE).
	 *
	 * @param int $target_post_id The ID the translated post.
	 *
	 * @return mixed|void|null The language code or null.
	 */
	private function get_target_lang( $target_post_id ) {
		$targetLang = $this->getTargetLangFromTranslationJob();
		if ( ! $targetLang ) {
			$args['element_id']   = $target_post_id;
			$args['element_type'] = get_post_type( $target_post_id );
			$targetLang           = apply_filters( 'wpml_element_language_code', null, $args );
		}
		return $targetLang;
	}

	/**
	 * Get target language from POST data sent during trabnslation job in CTE/ATE.
	 *
	 * @return false|string
	 */
	private function getTargetLangFromTranslationJob() {
		if ( isset( $_POST['trid'], $_POST['lang'] ) && ( $this->isCTEjobAction() || $this->isATEjobAction() ) ) {
			return filter_var( $_POST['lang'], FILTER_SANITIZE_STRING );
		}
		return false;
	}

	/**
	 * Checks if this is request during saving translation job from CTE.
	 *
	 * @return bool
	 */
	private function isCTEjobAction() {
		return isset( $_POST['action'] ) && 'wpml_save_job_ajax' === $_POST['action'] && wp_verify_nonce( $_POST['_icl_nonce'], 'wpml_save_job_nonce' );
	}

	/**
	 * Checks if this is request during saving translation job from ATE.
	 *
	 * @return bool
	 */
	private function isATEjobAction() {
		return isset( $_SERVER['REQUEST_URI'] ) && 0 < stripos( $_SERVER['REQUEST_URI'], 'ate/jobs/download' );
	}

	/**
	 * Checks if request is done with wp-json endpoint 'apply-translations'.
	 *
	 * @return bool
	 */
	private function isApplyTranslationsRequest() {
		return isset( $_SERVER['REQUEST_URI'] ) && ( function() {
			$end = 'apply-translations/';
			$length = strlen( $end );
			return ( substr( $_SERVER['REQUEST_URI'], -$length ) === $end );
		} );
	}
}