/**
 * Filter REST API requests to add the language in the request
 *
 * @since 2.5
 */
wp.apiFetch.use( function( options, next ) {
	// If options.url is defined, this is not a REST request but a direct call to post.php for legacy metaboxes.
	if ( 'undefined' === typeof options.url ) {
		if ( 'undefined' === typeof options.data ) {
			// GET
			options.path += ( ( options.path.indexOf ( '?' ) >= 0 ) ? '&lang=' : '?lang=' ) + getCurrentLanguage();
		} else {
			// PUT, POST
			options.data.lang = getCurrentLanguage();
		}
	}
	return next( options );
} );

/**
 * Get the language from the HTML form
 *
 * @since 2.5
 *
 * @return {Element.value}
 */
function getCurrentLanguage() {
	return document.querySelector( '[name=post_lang_choice]' ).value;
}

/**
 * Save post after lang choice is done and redirect to the same page for refreshing all the data
 *
 * @since 2.5
 */
jQuery( document ).ready(function( $ ) {
	// savePost after changing the post's language and reload page for refreshing post translated data
	$( '.post_lang_choice' ).change(function() {
		const select = wp.data.select;
		const dispatch = wp.data.dispatch;
		const subscribe = wp.data.subscribe;

		let unsubscribe = null;

		// Listen if the savePost is done
		const savePostIsDone = new Promise( function( resolve, reject ) {
			unsubscribe = subscribe( function() {
				const isSavePostSucceeded = select('core/editor').didPostSaveRequestSucceed();
				const isSavePostFailed = select('core/editor').didPostSaveRequestFail();
				if ( isSavePostSucceeded || isSavePostFailed ) {
					if ( isSavePostFailed ) {
						reject();
					} else {
						resolve();
					}
				}
			} );
		});

		// Specific case for empty posts
		if ( location.pathname.match( /post-new.php/gi ) ) {
			const title = select('core/editor').getEditedPostAttribute('title');
			const content = select('core/editor').getEditedPostAttribute('content');
			const excerpt = select('core/editor').getEditedPostAttribute('excerpt');
			if ( '' === title && '' === content && '' === excerpt ) {
				// Change the new_lang parameter with the new language value for reloading the page
				if ( -1 != location.search.indexOf( 'new_lang' ) ) {
					window.location.search = window.location.search.replace( /(?:new_lang=[^&]*)(&)?(.*)/, 'new_lang=' + this.value + '$1$2' );;
				} else {
					window.location.search = window.location.search + ( ( -1 != window.location.search.indexOf( '?' ) ) ? '&' : '?' ) + 'new_lang=' + this.value;
				}
			}
		}

		// For empty posts savePost does nothing
		dispatch( 'core/editor' ).savePost();

		savePostIsDone
			.then( function() {
				// If the post is well saved, we can reload the page
				unsubscribe();
				window.location.reload();
			}, function() {
				// If the post save failed
				unsubscribe();
			} )
			.catch( function() {
				// If an exception is thrown
				unsubscribe();
			} );
	} );
} );

/**
 * Handles internals of the metabox:
 * Language select, autocomplete input field and buttons.
 *
 * @since 1.5
 */
jQuery( document ).ready(function( $ ) {
	// Ajax for changing the post's language in the languages metabox
	$( '.post_lang_choice' ).change(function() {
		var data = {
			action:     'post_lang_choice',
			lang:       $( this ).val(),
			post_type:  $( '#post_type' ).val(),
			post_id:    $( '#post_ID' ).val(),
			_pll_nonce: $( '#_pll_nonce' ).val()
		}

		$.post( ajaxurl, data , function( response ) {
			var res = wpAjax.parseAjaxResponse( response, 'ajax-response' );
			$.each( res.responses, function() {
				switch ( this.what ) {
					case 'translations': // Translations fields
						$( '.translations' ).html( this.data );
						init_translations();
					break;
					case 'flag': // Flag in front of the select dropdown
						$( '.pll-select-flag' ).html( this.data );
					break;
				}
			});
		});
	});

	// Translations autocomplete input box
	function init_translations() {
		$( '.tr_lang' ).each(function(){
			var tr_lang = $( this ).attr( 'id' ).substring( 8 );
			var td = $( this ).parent().parent().siblings( '.pll-edit-column' );

			$( this ).autocomplete({
				minLength: 0,

				source: ajaxurl + '?action=pll_posts_not_translated' +
					'&post_language=' + $( '.post_lang_choice' ).val() +
					'&translation_language=' + tr_lang +
					'&post_type=' + $( '#post_type' ).val() +
					'&_pll_nonce=' + $( '#_pll_nonce' ).val(),

				select: function( event, ui ) {
					$( '#htr_lang_' + tr_lang ).val( ui.item.id );
					td.html( ui.item.link );
				},
			});

			// When the input box is emptied
			$( this ).blur(function() {
				if ( ! $( this ).val() ) {
					$( '#htr_lang_' + tr_lang ).val( 0 );
					td.html( td.siblings( '.hidden' ).children().clone() );
				}
			});
		});
	}

	init_translations();

	// Handle the response to a click on a Languages metabox button
	$( '#ml_box' ).on( 'click', '.pll-button', function(){
		var value = $( this ).hasClass( 'wp-ui-text-highlight' );
		var id = $( this ).attr( 'id' );
		var post_id = $( '#htr_lang_' + id.replace( 'pll_sync_post[', '' ).replace( ']', '' ) ).val();

		if ( 'undefined' == typeof( post_id ) || 0 == post_id || value || confirm( confirm_text ) ) {
			var data = {
				action:     'toggle_' + id,
				value:      value,
				post_type:  $( '#post_type' ).val(),
				_pll_nonce: $( '#_pll_nonce' ).val()
			}

			$.post( ajaxurl, data , function( response ){
				var res = wpAjax.parseAjaxResponse( response, 'ajax-response' );
				$.each( res.responses, function() {
					id = id.replace( '[', '\\[' ).replace( ']', '\\]' );
					$( '#' + id ).toggleClass( 'wp-ui-text-highlight' ).attr( 'title', this.data ).children( 'span' ).html( this.data );
					$( 'input[name="' + id + '"]' ).val( ! data['value'] );
				});
			});
		}
	});
});