/*global wc_add_to_cart_variation_params */
( function ( $, window, document, undefined ) {
	/**
	 * VariationForm class which handles variation forms and attributes.
	 */
	var VariationForm = function ( $form ) {
		var self = this;

		self.$form = $form;
		self.$attributeFields = $form.find( '.variations select' );
		self.$singleVariation = $form.find( '.single_variation' );
		self.$singleVariationWrap = $form.find( '.single_variation_wrap' );
		self.$resetVariations = $form.find( '.reset_variations' );
		self.$resetAlert = $form.find( '.reset_variations_alert' );
		self.$product = $form.closest( '.product' );
		self.variationData = $form.data( 'product_variations' );
		self.useAjax = false === self.variationData;
		self.xhr = false;
		self.loading = true;

		// Initial state.
		self.$singleVariationWrap.show();
		self.$form.off( '.wc-variation-form' );

		// Methods.
		self.getChosenAttributes = self.getChosenAttributes.bind( self );
		self.findMatchingVariations = self.findMatchingVariations.bind( self );
		self.isMatch = self.isMatch.bind( self );
		self.toggleResetLink = self.toggleResetLink.bind( self );
		self.showNoMatchingVariationsMsg =
			self.showNoMatchingVariationsMsg.bind( self );

		// Events.
		$form.on(
			'click.wc-variation-form',
			'.reset_variations',
			{ variationForm: self },
			self.onReset
		);
		$form.on(
			'reload_product_variations',
			{ variationForm: self },
			self.onReload
		);
		$form.on( 'hide_variation', { variationForm: self }, self.onHide );
		$form.on( 'show_variation', { variationForm: self }, self.onShow );
		$form.on(
			'click',
			'.single_add_to_cart_button',
			{ variationForm: self },
			self.onAddToCart
		);
		$form.on(
			'reset_data',
			{ variationForm: self },
			self.onResetDisplayedVariation
		);
		$form.on(
			'reset_focus',
			{ variationForm: self },
			self.onResetVariationFocus
		);
		$form.on(
			'announce_reset',
			{ variationForm: self },
			self.onAnnounceReset
		);
		$form.on(
			'clear_reset_announcement',
			{ variationForm: self },
			self.onClearResetAnnouncement
		);
		$form.on( 'reset_image', { variationForm: self }, self.onResetImage );
		$form.on(
			'change.wc-variation-form',
			'.variations select',
			{ variationForm: self },
			self.onChange
		);
		$form.on(
			'found_variation.wc-variation-form',
			{ variationForm: self },
			self.onFoundVariation
		);
		$form.on(
			'check_variations.wc-variation-form',
			{ variationForm: self },
			self.onFindVariation
		);
		$form.on(
			'update_variation_values.wc-variation-form',
			{ variationForm: self },
			self.onUpdateAttributes
		);
		$form.on(
			'keydown.wc-variation-form',
			'.reset_variations',
			{ variationForm: self },
			self.onResetKeyDown
		);

		// Init after gallery.
		setTimeout( function () {
			$form.trigger( 'check_variations' );
			$form.trigger( 'wc_variation_form', self );

			// For variable products, we disable the button by default to avoid
			// shoppers submitting the form with invalid data. We remove the
			// disabled attribute as soon as the script is loaded and let the
			// script handle the button state.
			// @see https://github.com/woocommerce/woocommerce/issues/62448
			$form.find( '.single_add_to_cart_button' ).removeAttr( 'disabled' );
			self.loading = false;
		}, 100 );
	};

	/**
	 * Reset all fields.
	 */
	VariationForm.prototype.onReset = function ( event ) {
		event.preventDefault();
		event.data.variationForm.$attributeFields.val( '' ).trigger( 'change' );
		event.data.variationForm.$form.trigger( 'announce_reset' );
		event.data.variationForm.$form.trigger( 'reset_data' );
		event.data.variationForm.$form.trigger( 'reset_focus' );
	};

	/**
	 * Reload variation data from the DOM.
	 */
	VariationForm.prototype.onReload = function ( event ) {
		var form = event.data.variationForm;
		form.variationData = form.$form.data( 'product_variations' );
		form.useAjax = false === form.variationData;
		form.$form.trigger( 'check_variations' );
	};

	/**
	 * When a variation is hidden.
	 */
	VariationForm.prototype.onHide = function ( event ) {
		event.preventDefault();
		event.data.variationForm.$form
			.find( '.single_add_to_cart_button' )
			.removeClass( 'wc-variation-is-unavailable' )
			.addClass( 'disabled wc-variation-selection-needed' );
		event.data.variationForm.$form
			.find( '.woocommerce-variation-add-to-cart' )
			.removeClass( 'woocommerce-variation-add-to-cart-enabled' )
			.addClass( 'woocommerce-variation-add-to-cart-disabled' );
	};

	/**
	 * When a variation is shown.
	 */
	VariationForm.prototype.onShow = function (
		event,
		variation,
		purchasable
	) {
		event.preventDefault();
		if ( purchasable ) {
			event.data.variationForm.$form
				.find( '.single_add_to_cart_button' )
				.removeClass(
					'disabled wc-variation-selection-needed wc-variation-is-unavailable'
				);
			event.data.variationForm.$form
				.find( '.woocommerce-variation-add-to-cart' )
				.removeClass( 'woocommerce-variation-add-to-cart-disabled' )
				.addClass( 'woocommerce-variation-add-to-cart-enabled' );
		} else {
			event.data.variationForm.$form
				.find( '.single_add_to_cart_button' )
				.removeClass( 'wc-variation-selection-needed' )
				.addClass( 'disabled wc-variation-is-unavailable' );
			event.data.variationForm.$form
				.find( '.woocommerce-variation-add-to-cart' )
				.removeClass( 'woocommerce-variation-add-to-cart-enabled' )
				.addClass( 'woocommerce-variation-add-to-cart-disabled' );
		}

		// If present, the media element library needs initialized on the variation description.
		if ( wp.mediaelement ) {
			event.data.variationForm.$form
				.find( '.wp-audio-shortcode, .wp-video-shortcode' )
				.not( '.mejs-container' )
				.filter( function () {
					return ! $( this ).parent().hasClass( 'mejs-mediaelement' );
				} )
				.mediaelementplayer( wp.mediaelement.settings );
		}
	};

	/**
	 * When the cart button is pressed.
	 */
	VariationForm.prototype.onAddToCart = function ( event ) {
		if ( $( this ).is( '.disabled' ) ) {
			event.preventDefault();

			if ( $( this ).is( '.wc-variation-is-unavailable' ) ) {
				window.alert(
					wc_add_to_cart_variation_params.i18n_unavailable_text
				);
			} else if ( $( this ).is( '.wc-variation-selection-needed' ) ) {
				window.alert(
					wc_add_to_cart_variation_params.i18n_make_a_selection_text
				);
			}
		}
	};

	/**
	 * When displayed variation data is reset.
	 */
	VariationForm.prototype.onResetDisplayedVariation = function ( event ) {
		var form = event.data.variationForm;
		form.$product.find( '.product_meta' ).find( '.sku' ).wc_reset_content();
		form.$product
			.find(
				'.product_weight, .woocommerce-product-attributes-item--weight .woocommerce-product-attributes-item__value'
			)
			.wc_reset_content();
		form.$product
			.find(
				'.product_dimensions, .woocommerce-product-attributes-item--dimensions .woocommerce-product-attributes-item__value'
			)
			.wc_reset_content();
		form.$form.trigger( 'reset_image' );
		form.$singleVariation.slideUp( 200 ).trigger( 'hide_variation' );
	};

	/**
	 * Announce reset to screen readers.
	 */
	VariationForm.prototype.onAnnounceReset = function ( event ) {
		event.data.variationForm.$resetAlert.text(
			wc_add_to_cart_variation_params.i18n_reset_alert_text
		);
	};

	/**
	 * Focus variation reset
	 */
	VariationForm.prototype.onResetVariationFocus = function ( event ) {
		event.data.variationForm.$attributeFields[ 0 ].focus();
	};

	/** Clear reset announcement */
	VariationForm.prototype.onClearResetAnnouncement = function ( event ) {
		event.data.variationForm.$resetAlert.text( '' );
	};

	/**
	 * When the product image is reset.
	 */
	VariationForm.prototype.onResetImage = function ( event ) {
		event.data.variationForm.$form.wc_variations_image_update( false );
	};

	/**
	 * Looks for matching variations for current selected attributes.
	 */
	VariationForm.prototype.onFindVariation = function (
		event,
		chosenAttributes
	) {
		var form = event.data.variationForm,
			attributes =
				'undefined' !== typeof chosenAttributes
					? chosenAttributes
					: form.getChosenAttributes(),
			currentAttributes = attributes.data;

		if ( attributes.count && attributes.count === attributes.chosenCount ) {
			if ( form.useAjax ) {
				if ( form.xhr ) {
					form.xhr.abort();
				}
				form.$form.block( {
					message: null,
					overlayCSS: { background: '#fff', opacity: 0.6 },
				} );
				currentAttributes.product_id = parseInt(
					form.$form.data( 'product_id' ),
					10
				);
				currentAttributes.custom_data =
					form.$form.data( 'custom_data' );
				form.xhr = $.ajax( {
					url: wc_add_to_cart_variation_params.wc_ajax_url
						.toString()
						.replace( '%%endpoint%%', 'get_variation' ),
					type: 'POST',
					data: currentAttributes,
					success: function ( variation ) {
						if ( variation ) {
							form.$form.trigger( 'found_variation', [
								variation,
							] );
						} else {
							form.$form.trigger( 'reset_data' );
							attributes.chosenCount = 0;

							if ( ! form.loading ) {
								form.showNoMatchingVariationsMsg();
							}
						}
					},
					complete: function () {
						form.$form.unblock();
					},
				} );
			} else {
				form.$form.trigger( 'update_variation_values' );

				var matching_variations = form.findMatchingVariations(
						form.variationData,
						currentAttributes
					),
					variation = matching_variations.shift();

				if ( variation ) {
					form.$form.trigger( 'found_variation', [ variation ] );
				} else {
					form.$form.trigger( 'reset_data' );
					attributes.chosenCount = 0;

					if ( ! form.loading ) {
						form.showNoMatchingVariationsMsg();
					}
				}
			}
		} else {
			form.$form.trigger( 'update_variation_values' );
			form.$form.trigger( 'reset_data' );
		}

		// Show reset link.
		form.toggleResetLink( attributes.chosenCount > 0 );
	};

	/**
	 * Triggered when a variation has been found which matches all attributes.
	 */
	VariationForm.prototype.onFoundVariation = function ( event, variation ) {
		var form = event.data.variationForm,
			$sku = form.$product.find( '.product_meta' ).find( '.sku' ),
			$weight = form.$product.find(
				'.product_weight, .woocommerce-product-attributes-item--weight .woocommerce-product-attributes-item__value'
			),
			$dimensions = form.$product.find(
				'.product_dimensions, .woocommerce-product-attributes-item--dimensions .woocommerce-product-attributes-item__value'
			),
			$qty_input = form.$singleVariationWrap.find(
				'.quantity input.qty[name="quantity"]'
			),
			$qty = $qty_input.closest( '.quantity' ),
			purchasable = true,
			variation_id = '',
			template = false,
			$template_html = '';

		if ( variation.sku ) {
			$sku.wc_set_content( variation.sku );
		} else {
			$sku.wc_reset_content();
		}

		if ( variation.weight ) {
			$weight.wc_set_content( variation.weight_html );
		} else {
			$weight.wc_reset_content();
		}

		if ( variation.dimensions ) {
			// Decode HTML entities.
			$dimensions.wc_set_content(
				$.parseHTML( variation.dimensions_html )[ 0 ].data
			);
		} else {
			$dimensions.wc_reset_content();
		}

		form.$form.wc_variations_image_update( variation );

		if ( ! variation.variation_is_visible ) {
			template = wp_template( 'unavailable-variation-template' );
		} else {
			template = wp_template( 'variation-template' );
			variation_id = variation.variation_id;
		}

		$template_html = template( {
			variation: variation,
		} );
		$template_html = $template_html.replace( '/*<![CDATA[*/', '' );
		$template_html = $template_html.replace( '/*]]>*/', '' );

		form.$form
			.find( 'input[name="variation_id"], input.variation_id' )
			.val( variation.variation_id )
			.trigger( 'change' );

		// Hide or show qty input
		if ( variation.is_sold_individually === 'yes' ) {
			$qty_input
				.val( '1' )
				.attr( 'min', '1' )
				.attr( 'max', '' )
				.trigger( 'change' );
			$qty.hide();
		} else {
			var qty_val = parseFloat( $qty_input.val() );

			if ( isNaN( qty_val ) ) {
				qty_val = variation.min_qty;
			} else {
				qty_val =
					qty_val > parseFloat( variation.max_qty )
						? variation.max_qty
						: qty_val;
				qty_val =
					qty_val < parseFloat( variation.min_qty )
						? variation.min_qty
						: qty_val;
			}

			$qty_input
				.attr( 'min', variation.min_qty )
				.attr( 'max', variation.max_qty )
				.val( qty_val )
				.trigger( 'change' );
			$qty.show();
		}

		// Enable or disable the add to cart button
		if (
			! variation.is_purchasable ||
			! variation.is_in_stock ||
			! variation.variation_is_visible
		) {
			purchasable = false;
		}

		// Add a delay before updating the live region to ensure screen readers pick up the content changes.
		setTimeout( function () {
			form.$singleVariation.html( $template_html );

			// Reveal
			if ( form.$singleVariation.text().trim() ) {
				form.$singleVariation
					.slideDown( 200 )
					.trigger( 'show_variation', [ variation, purchasable ] );
			} else {
				form.$singleVariation
					.show()
					.trigger( 'show_variation', [ variation, purchasable ] );
			}
		}, 300 );
	};

	/**
	 * Triggered when an attribute field changes.
	 */
	VariationForm.prototype.onChange = function ( event ) {
		var form = event.data.variationForm;

		form.$form
			.find( 'input[name="variation_id"], input.variation_id' )
			.val( '' )
			.trigger( 'change' );
		form.$form.trigger( 'clear_reset_announcement' );
		form.$form.find( '.wc-no-matching-variations' ).parent().remove();

		if ( form.useAjax ) {
			form.$form.trigger( 'check_variations' );
		} else {
			form.$form.trigger( 'woocommerce_variation_select_change' );
			form.$form.trigger( 'check_variations' );
		}

		// Custom event for when variation selection has been changed
		form.$form.trigger( 'woocommerce_variation_has_changed' );
	};

	/**
	 * Escape quotes in a string.
	 * @param {string} string
	 * @return {string}
	 */
	VariationForm.prototype.addSlashes = function ( string ) {
		string = string.replace( /'/g, "\\'" );
		string = string.replace( /"/g, '\\"' );
		return string;
	};

	/**
	 * Updates attributes in the DOM to show valid values.
	 */
	VariationForm.prototype.onUpdateAttributes = function ( event ) {
		var form = event.data.variationForm,
			attributes = form.getChosenAttributes(),
			currentAttributes = attributes.data;

		if ( form.useAjax ) {
			return;
		}

		// Loop through selects and disable/enable options based on selections.
		form.$attributeFields.each( function ( index, el ) {
			var current_attr_select = $( el ),
				current_attr_name =
					current_attr_select.data( 'attribute_name' ) ||
					current_attr_select.attr( 'name' ),
				show_option_none = $( el ).data( 'show_option_none' ),
				option_gt_filter = ':gt(0)',
				attached_options_count = 0,
				new_attr_select = $( '<select/>' ),
				selected_attr_val = current_attr_select.val() || '',
				selected_attr_val_valid = true;

			// Reference options set at first.
			if ( ! current_attr_select.data( 'attribute_html' ) ) {
				var refSelect = current_attr_select.clone();

				refSelect
					.find( 'option' )
					.removeAttr( 'attached' )
					.prop( 'disabled', false )
					.prop( 'selected', false );

				// Legacy data attribute.
				current_attr_select.data(
					'attribute_options',
					refSelect.find( 'option' + option_gt_filter ).get()
				);
				current_attr_select.data( 'attribute_html', refSelect.html() );
			}

			new_attr_select.html(
				current_attr_select.data( 'attribute_html' )
			);

			// The attribute of this select field should not be taken into account when calculating its matching variations:
			// The constraints of this attribute are shaped by the values of the other attributes.
			var checkAttributes = $.extend( true, {}, currentAttributes );

			checkAttributes[ current_attr_name ] = '';

			var variations = form.findMatchingVariations(
				form.variationData,
				checkAttributes
			);

			// Loop through variations.
			for ( var num in variations ) {
				if ( typeof variations[ num ] !== 'undefined' ) {
					var variationAttributes = variations[ num ].attributes;

					for ( var attr_name in variationAttributes ) {
						if ( variationAttributes.hasOwnProperty( attr_name ) ) {
							var attr_val = variationAttributes[ attr_name ],
								variation_active = '';

							if ( attr_name === current_attr_name ) {
								if ( variations[ num ].variation_is_active ) {
									variation_active = 'enabled';
								}

								if ( attr_val ) {
									// Decode entities.
									attr_val = $( '<div/>' )
										.html( attr_val )
										.text();

									// Attach to matching options by value. This is done to compare
									// TEXT values rather than any HTML entities.
									var $option_elements =
										new_attr_select.find( 'option' );
									if ( $option_elements.length ) {
										for (
											var i = 0,
												len = $option_elements.length;
											i < len;
											i++
										) {
											var $option_element = $(
													$option_elements[ i ]
												),
												option_value =
													$option_element.val();

											if ( attr_val === option_value ) {
												$option_element.addClass(
													'attached ' +
														variation_active
												);
												break;
											}
										}
									}
								} else {
									// Attach all apart from placeholder.
									new_attr_select
										.find( 'option:gt(0)' )
										.addClass(
											'attached ' + variation_active
										);
								}
							}
						}
					}
				}
			}

			// Count available options.
			attached_options_count =
				new_attr_select.find( 'option.attached' ).length;

			// Check if current selection is in attached options.
			if ( selected_attr_val ) {
				selected_attr_val_valid = false;

				if ( 0 !== attached_options_count ) {
					new_attr_select
						.find( 'option.attached.enabled' )
						.each( function () {
							var option_value = $( this ).val();

							if ( selected_attr_val === option_value ) {
								selected_attr_val_valid = true;
								return false; // break.
							}
						} );
				}
			}

			// Detach the placeholder if:
			// - Valid options exist.
			// - The current selection is non-empty.
			// - The current selection is valid.
			// - Placeholders are not set to be permanently visible.
			if (
				attached_options_count > 0 &&
				selected_attr_val &&
				selected_attr_val_valid &&
				'no' === show_option_none
			) {
				new_attr_select.find( 'option:first' ).remove();
				option_gt_filter = '';
			}

			// Detach unattached.
			new_attr_select
				.find( 'option' + option_gt_filter + ':not(.attached)' )
				.remove();

			// Finally, copy to DOM and set value.
			current_attr_select.html( new_attr_select.html() );
			current_attr_select
				.find( 'option' + option_gt_filter + ':not(.enabled)' )
				.prop( 'disabled', true );

			// Choose selected value.
			if ( selected_attr_val ) {
				// If the previously selected value is no longer available, fall back to the placeholder (it's going to be there).
				if ( selected_attr_val_valid ) {
					current_attr_select.val( selected_attr_val );
				} else {
					current_attr_select.val( '' ).trigger( 'change' );
				}
			} else {
				current_attr_select.val( '' ); // No change event to prevent infinite loop.
			}
		} );

		// Custom event for when variations have been updated.
		form.$form.trigger( 'woocommerce_update_variation_values' );
	};

	/**
	 * Get chosen attributes from form.
	 * @return array
	 */
	VariationForm.prototype.getChosenAttributes = function () {
		var data = {};
		var count = 0;
		var chosen = 0;

		this.$attributeFields.each( function () {
			var attribute_name =
				$( this ).data( 'attribute_name' ) || $( this ).attr( 'name' );
			var value = $( this ).val() || '';

			if ( value.length > 0 ) {
				chosen++;
			}

			count++;
			data[ attribute_name ] = value;
		} );

		return {
			count: count,
			chosenCount: chosen,
			data: data,
		};
	};

	/**
	 * Find matching variations for attributes.
	 */
	VariationForm.prototype.findMatchingVariations = function (
		variations,
		attributes
	) {
		var matching = [];
		for ( var i = 0; i < variations.length; i++ ) {
			var variation = variations[ i ];

			if ( this.isMatch( variation.attributes, attributes ) ) {
				matching.push( variation );
			}
		}
		return matching;
	};

	/**
	 * See if attributes match.
	 * @return {Boolean}
	 */
	VariationForm.prototype.isMatch = function (
		variation_attributes,
		attributes
	) {
		var match = true;
		for ( var attr_name in variation_attributes ) {
			if ( variation_attributes.hasOwnProperty( attr_name ) ) {
				var val1 = variation_attributes[ attr_name ];
				var val2 = attributes[ attr_name ];
				if (
					val1 !== undefined &&
					val2 !== undefined &&
					val1.length !== 0 &&
					val2.length !== 0 &&
					val1 !== val2
				) {
					match = false;
				}
			}
		}
		return match;
	};

	/**
	 * Show or hide the reset link.
	 */
	VariationForm.prototype.toggleResetLink = function ( on ) {
		if ( on ) {
			if ( this.$resetVariations.css( 'visibility' ) === 'hidden' ) {
				this.$resetVariations
					.css( 'visibility', 'visible' )
					.hide()
					.fadeIn();
			}
		} else {
			this.$resetVariations.css( 'visibility', 'hidden' );
		}
	};

	/**
	 * Show no matching variation message.
	 */
	VariationForm.prototype.showNoMatchingVariationsMsg = function () {
		this.$form
			.find( '.single_variation' )
			.after(
				'<div role="alert">' +
					'<p class="wc-no-matching-variations woocommerce-info">' +
					wc_add_to_cart_variation_params.i18n_no_matching_variations_text +
					'</p>' +
					'</div>'
			)
			.next( 'div' )
			.find( '.wc-no-matching-variations' )
			.slideDown( 200 );
	};

	/**
	 * Handle reset key down event for accessibility.
	 * @param {KeyboardEvent} event - The keyboard event object
	 */
	VariationForm.prototype.onResetKeyDown = function ( event ) {
		if ( event.code === 'Enter' || event.code === 'Space' ) {
			event.preventDefault();
			event.data.variationForm.onReset( event );
		}
	};

	/**
	 * Function to call wc_variation_form on jquery selector.
	 */
	$.fn.wc_variation_form = function () {
		new VariationForm( this );
		return this;
	};

	/**
	 * Stores the default text for an element so it can be reset later
	 */
	$.fn.wc_set_content = function ( content ) {
		if ( undefined === this.attr( 'data-o_content' ) ) {
			this.attr( 'data-o_content', this.text() );
		}
		this.text( content );
	};

	/**
	 * Stores the default text for an element so it can be reset later
	 */
	$.fn.wc_reset_content = function () {
		if ( undefined !== this.attr( 'data-o_content' ) ) {
			this.text( this.attr( 'data-o_content' ) );
		}
	};

	/**
	 * Stores a default attribute for an element so it can be reset later
	 */
	$.fn.wc_set_variation_attr = function ( attr, value ) {
		if ( undefined === this.attr( 'data-o_' + attr ) ) {
			this.attr(
				'data-o_' + attr,
				! this.attr( attr ) ? '' : this.attr( attr )
			);
		}
		if ( false === value ) {
			this.removeAttr( attr );
		} else {
			this.attr( attr, value );
		}
	};

	/**
	 * Reset a default attribute for an element so it can be reset later
	 */
	$.fn.wc_reset_variation_attr = function ( attr ) {
		if ( undefined !== this.attr( 'data-o_' + attr ) ) {
			this.attr( attr, this.attr( 'data-o_' + attr ) );
		}
	};

	/**
	 * Reset the slide position if the variation has a different image than the current one
	 */
	$.fn.wc_maybe_trigger_slide_position_reset = function ( variation ) {
		var $form = $( this ),
			$product = $form.closest( '.product' ),
			$product_gallery = $product.find( '.images' ),
			reset_slide_position = false,
			new_image_id =
				variation && variation.image_id ? variation.image_id : '';

		if ( $form.attr( 'current-image' ) !== new_image_id ) {
			reset_slide_position = true;
		}

		$form.attr( 'current-image', new_image_id );

		if ( reset_slide_position ) {
			$product_gallery.trigger(
				'woocommerce_gallery_reset_slide_position'
			);
		}
	};

	/**
	 * Sets product images for the chosen variation
	 */
	$.fn.wc_variations_image_update = function ( variation ) {
		var $form = this,
			$product = $form.closest( '.product' ),
			$product_gallery = $product.find( '.images' ),
			$gallery_nav = $product.find( '.flex-control-nav' ),
			$gallery_img = $gallery_nav.find( 'li:eq(0) img' ),
			$product_img_wrap = $product_gallery
				.find(
					'.woocommerce-product-gallery__image, .woocommerce-product-gallery__image--placeholder'
				)
				.eq( 0 ),
			$product_img = $product_img_wrap.find( '.wp-post-image' ),
			$product_link = $product_img_wrap.find( 'a' ).eq( 0 );

		if (
			variation &&
			variation.image &&
			variation.image.src &&
			variation.image.src.length > 1
		) {
			// See if the gallery has an image with the same original src as the image we want to switch to.
			var galleryHasImage =
				$gallery_nav.find(
					'li img[data-o_src="' +
						variation.image.gallery_thumbnail_src +
						'"]'
				).length > 0;

			// If the gallery has the image, reset the images. We'll scroll to the correct one.
			if ( galleryHasImage ) {
				$form.wc_variations_image_reset();
			}

			// See if gallery has a matching image we can slide to.
			var slideToImage = $gallery_nav.find(
				'li img[src="' + variation.image.gallery_thumbnail_src + '"]'
			);

			if ( slideToImage.length > 0 ) {
				slideToImage.trigger( 'flexslider-click' );
				$form.attr( 'current-image', variation.image_id );
				window.setTimeout( function () {
					$( window ).trigger( 'resize' );
					$product_gallery.trigger( 'woocommerce_gallery_init_zoom' );
				}, 20 );
				return;
			}

			$product_img.wc_set_variation_attr( 'src', variation.image.src );
			$product_img.wc_set_variation_attr(
				'height',
				variation.image.src_h
			);
			$product_img.wc_set_variation_attr(
				'width',
				variation.image.src_w
			);
			$product_img.wc_set_variation_attr(
				'srcset',
				variation.image.srcset
			);
			$product_img.wc_set_variation_attr(
				'sizes',
				variation.image.sizes
			);
			$product_img.wc_set_variation_attr(
				'title',
				variation.image.title
			);
			$product_img.wc_set_variation_attr(
				'data-caption',
				variation.image.caption
			);
			$product_img.wc_set_variation_attr( 'alt', variation.image.alt );
			$product_img.wc_set_variation_attr(
				'data-src',
				variation.image.full_src
			);
			$product_img.wc_set_variation_attr(
				'data-large_image',
				variation.image.full_src
			);
			$product_img.wc_set_variation_attr(
				'data-large_image_width',
				variation.image.full_src_w
			);
			$product_img.wc_set_variation_attr(
				'data-large_image_height',
				variation.image.full_src_h
			);
			$product_img_wrap.wc_set_variation_attr(
				'data-thumb',
				variation.image.src
			);
			$gallery_img.wc_set_variation_attr(
				'src',
				variation.image.gallery_thumbnail_src
			);
			$product_link.wc_set_variation_attr(
				'href',
				variation.image.full_src
			);
		} else {
			$form.wc_variations_image_reset();
		}

		window.setTimeout( function () {
			$( window ).trigger( 'resize' );
			$form.wc_maybe_trigger_slide_position_reset( variation );
			$product_gallery.trigger( 'woocommerce_gallery_init_zoom' );
		}, 20 );
	};

	/**
	 * Reset main image to defaults.
	 */
	$.fn.wc_variations_image_reset = function () {
		var $form = this,
			$product = $form.closest( '.product' ),
			$product_gallery = $product.find( '.images' ),
			$gallery_nav = $product.find( '.flex-control-nav' ),
			$gallery_img = $gallery_nav.find( 'li:eq(0) img' ),
			$product_img_wrap = $product_gallery
				.find(
					'.woocommerce-product-gallery__image, .woocommerce-product-gallery__image--placeholder'
				)
				.eq( 0 ),
			$product_img = $product_img_wrap.find( '.wp-post-image' ),
			$product_link = $product_img_wrap.find( 'a' ).eq( 0 );

		$product_img.wc_reset_variation_attr( 'src' );
		$product_img.wc_reset_variation_attr( 'width' );
		$product_img.wc_reset_variation_attr( 'height' );
		$product_img.wc_reset_variation_attr( 'srcset' );
		$product_img.wc_reset_variation_attr( 'sizes' );
		$product_img.wc_reset_variation_attr( 'title' );
		$product_img.wc_reset_variation_attr( 'data-caption' );
		$product_img.wc_reset_variation_attr( 'alt' );
		$product_img.wc_reset_variation_attr( 'data-src' );
		$product_img.wc_reset_variation_attr( 'data-large_image' );
		$product_img.wc_reset_variation_attr( 'data-large_image_width' );
		$product_img.wc_reset_variation_attr( 'data-large_image_height' );
		$product_img_wrap.wc_reset_variation_attr( 'data-thumb' );
		$gallery_img.wc_reset_variation_attr( 'src' );
		$product_link.wc_reset_variation_attr( 'href' );
	};

	$( function () {
		if ( typeof wc_add_to_cart_variation_params !== 'undefined' ) {
			$( '.variations_form' ).each( function () {
				$( this ).wc_variation_form();
			} );
		}
	} );

	/**
	 * Matches inline variation objects to chosen attributes
	 * @deprecated 2.6.9
	 * @type {Object}
	 */
	var wc_variation_form_matcher = {
		find_matching_variations: function ( product_variations, settings ) {
			var matching = [];
			for ( var i = 0; i < product_variations.length; i++ ) {
				var variation = product_variations[ i ];

				if (
					wc_variation_form_matcher.variations_match(
						variation.attributes,
						settings
					)
				) {
					matching.push( variation );
				}
			}
			return matching;
		},
		variations_match: function ( attrs1, attrs2 ) {
			var match = true;
			for ( var attr_name in attrs1 ) {
				if ( attrs1.hasOwnProperty( attr_name ) ) {
					var val1 = attrs1[ attr_name ];
					var val2 = attrs2[ attr_name ];
					if (
						val1 !== undefined &&
						val2 !== undefined &&
						val1.length !== 0 &&
						val2.length !== 0 &&
						val1 !== val2
					) {
						match = false;
					}
				}
			}
			return match;
		},
	};

	/**
	 * Avoids using wp.template where possible in order to be CSP compliant.
	 * wp.template uses internally eval().
	 * @param {string} templateId
	 * @return {Function}
	 */
	var wp_template = function ( templateId ) {
		var html = document.getElementById( 'tmpl-' + templateId ).textContent;
		var hard = false;
		// any <# #> interpolate (evaluate).
		hard = hard || /<#\s?data\./.test( html );
		// any data that is NOT data.variation.
		hard = hard || /{{{?\s?data\.(?!variation\.).+}}}?/.test( html );
		// any data access deeper than 1 level e.g.
		// data.variation.object.item
		// data.variation.object['item']
		// data.variation.array[0]
		hard = hard || /{{{?\s?data\.variation\.[\w-]*[^\s}]/.test( html );
		if ( hard ) {
			return wp.template( templateId );
		}
		return function template( data ) {
			var variation = data.variation || {};
			return html.replace(
				/({{{?)\s?data\.variation\.([\w-]*)\s?(}}}?)/g,
				function ( _, open, key, close ) {
					// Error in the format, ignore.
					if ( open.length !== close.length ) {
						return '';
					}
					var replacement = variation[ key ] || '';
					// {{{ }}} => interpolate (unescaped).
					// {{  }}  => interpolate (escaped).
					// https://codex.wordpress.org/Javascript_Reference/wp.template
					if ( open.length === 2 ) {
						return window.escape( replacement );
					}
					return replacement;
				}
			);
		};
	};
} )( jQuery, window, document );
