/* global wc_cart_params */
jQuery( function( $ ) {

	// wc_cart_params is required to continue, ensure the object exists
	if ( typeof wc_cart_params === 'undefined' ) {
		return false;
	}

	// Utility functions for the file.

	/**
	 * Gets a url for a given AJAX endpoint.
	 *
	 * @param {String} endpoint The AJAX Endpoint
	 * @return {String} The URL to use for the request
	 */
	var get_url = function( endpoint ) {
		return wc_cart_params.wc_ajax_url.toString().replace(
			'%%endpoint%%',
			endpoint
		);
	};

	/**
	 * Check if a node is blocked for processing.
	 *
	 * @param {JQuery Object} $node
	 * @return {bool} True if the DOM Element is UI Blocked, false if not.
	 */
	var is_blocked = function( $node ) {
		return $node.is( '.processing' );
	};

	/**
	 * Block a node visually for processing.
	 *
	 * @param {JQuery Object} $node
	 */
	var block = function( $node ) {
		$node.addClass( 'processing' ).block( {
			message: null,
			overlayCSS: {
				background: '#fff',
				opacity: 0.6
			}
		} );
	};

	/**
	 * Unblock a node after processing is complete.
	 *
	 * @param {JQuery Object} $node
	 */
	var unblock = function( $node ) {
		$node.removeClass( 'processing' ).unblock();
	};

	/**
	 * Update the .woocommerce div with a string of html.
	 *
	 * @param {String} html_str The HTML string with which to replace the div.
	 */
	var update_wc_div = function( html_str ) {
		var $html = $.parseHTML( html_str );
		var $new_form = $( 'table.shop_table.cart', $html ).closest( 'form' );
		var $error = $( '.woocommerce-error', $html );
		var $message = $( '.woocommerce-message', $html );

		if ( $error.length > 0 ) {
			show_notice( $error );
		} else if ( $message.length > 0 ) {
			show_notice( $message );
		} else {
			// No new message/error, just remove existing one.
			$( '.woocommerce-error, .woocommerce-message' ).remove();
		}

		if ( $new_form.length === 0 ) {
			// No items to display now! Reload page from server, so we can
			// display the "empty cart" page instead.
			location.reload();
		} else {
			$( 'table.shop_table.cart' ).closest( 'form' ).replaceWith( $new_form );
		}
	};

	/**
	 * Clear previous notices and shows new one above form.
	 *
	 * @param {Object} The Notice HTML Element in string or object form.
	 */
	var show_notice = function( html_element ) {
		var $form = $( 'table.shop_table.cart' ).closest( 'form' );

		$( '.woocommerce-error, .woocommerce-message' ).remove();
		$form.before( html_element );
	};


	/**
	 * Object to handle AJAX calls for cart shipping changes.
	 */
	var cart_shipping = {

		/**
		 * Initialize event handlers and UI state.
		 */
		init: function( cart ) {
			this.cart = cart;
			this.toggle_shipping = this.toggle_shipping.bind( this );
			this.shipping_method_selected = this.shipping_method_selected.bind( this );
			this.shipping_calculator_submit = this.shipping_calculator_submit.bind( this );

			$( document ).on(
				'click',
				'.shipping-calculator-button',
				this.toggle_shipping
			);
			$( document ).on(
				'change',
				'select.shipping_method, input[name^=shipping_method]',
				this.shipping_method_selected
			);
			$( document ).on(
				'submit',
				'form.woocommerce-shipping-calculator',
				this.shipping_calculator_submit
			);

			$( '.shipping-calculator-form' ).hide();
		},

		/**
		 * Toggle Shipping Calculator panel
		 */
		toggle_shipping: function() {
			$( '.shipping-calculator-form' ).slideToggle( 'slow' );
			return false;
		},

		/**
		 * Handles when a shipping method is selected.
		 *
		 * @param {Object} evt The JQuery event.
		 */
		shipping_method_selected: function( evt ) {
			var target = evt.target;

			var shipping_methods = [];

			$( 'select.shipping_method, input[name^=shipping_method][type=radio]:checked, input[name^=shipping_method][type=hidden]' ).each( function() {
				shipping_methods[ $( target ).data( 'index' ) ] = $( target ).val();
			} );

			block( $( 'div.cart_totals' ) );

			var data = {
				security: wc_cart_params.update_shipping_method_nonce,
				shipping_method: shipping_methods
			};

			$.post( get_url( 'update_shipping_method' ), data, function( response ) {
				$( 'div.cart_totals' ).replaceWith( response );
				$( document.body ).trigger( 'updated_shipping_method' );
			} );
		},

		/**
		 * Handles a shipping calculator form submit.
		 *
		 * @param {Object} evt The JQuery event.
		 */
		shipping_calculator_submit: function( evt ) {
			evt.preventDefault();

			var cart = this.cart;
			var $form = $( evt.target );

			block( $form );

			// Provide the submit button value because wc-form-handler expects it.
			$( '<input />' ).attr( 'type', 'hidden' )
											.attr( 'name', 'calc_shipping' )
											.attr( 'value', 'x' )
											.appendTo( $form );

			// Make call to actual form post URL.
			$.ajax( {
				type:     $form.attr( 'method' ),
				url:      $form.attr( 'action' ),
				data:     $form.serialize(),
				dataType: 'html',
				success:  function( response ) {
					update_wc_div(response );
				},
				complete: function() {
					unblock( $form );
					cart.update_cart_totals();
				}
			} );
		}
	};

	/**
	 * Object to handle cart UI.
	 */
	var cart = {
		/**
		 * Initialize cart UI events.
		 */
		init: function() {
			this.update_cart_totals = this.update_cart_totals.bind( this );
			this.cart_submit = this.cart_submit.bind( this );
			this.apply_coupon = this.apply_coupon.bind( this );
			this.remove_coupon_clicked = this.remove_coupon_clicked.bind( this );
			this.quantity_update = this.quantity_update.bind( this );
			this.item_remove_clicked = this.item_remove_clicked.bind( this );

			$( document ).on(
				'submit',
				'div.woocommerce > form',
				this.cart_submit );
			$( document ).on(
				'click',
				'a.woocommerce-remove-coupon',
				this.remove_coupon_clicked );
			$( document ).on(
				'click',
				'td.product-remove > a',
				this.item_remove_clicked );
		},

		/**
		 * Update the cart after something has changed.
		 */
		update_cart_totals: function() {
			block( $( 'div.cart_totals' ) );

			$.ajax( {
				url:      get_url( 'get_cart_totals' ),
				dataType: 'html',
				success: function( response ) {
					$( 'div.cart_totals' ).replaceWith( response );
				}
			} );
		},

		/**
		 * Handle cart form submit and route to correct logic.
		 *
		 * @param {Object} evt The JQuery event
		 */
		cart_submit: function( evt ) {
			evt.preventDefault();

			var $form = $( evt.target );
			var $submit = $( document.activeElement );

			if ( 0 === $form.find( 'table.shop_table.cart' ).length ) {
				return false;
			}
			if ( is_blocked( $form ) ) {
				return false;
			}

			if ( $submit.is( '[name="update_cart"]' ) || $submit.is( 'input.qty' ) ) {
				this.quantity_update( $form );

			} else if ( $submit.is( '[name="apply_coupon"]' ) || $submit.is( '#coupon_code' ) ) {
				this.apply_coupon( $form );
			}
		},

		/**
		 * Apply Coupon code
		 *
		 * @param {JQuery Object} $form The cart form.
		 */
		apply_coupon: function( $form ) {
			block( $form );

			var cart = this;
			var $text_field = $( '#coupon_code' );
			var coupon_code = $text_field.val();

			var data = {
				security: wc_cart_params.apply_coupon_nonce,
				coupon_code: coupon_code
			};

			$.ajax( {
				type:     'POST',
				url:      get_url( 'apply_coupon' ),
				data:     data,
				dataType: 'html',
				success: function( response ) {
					show_notice( response );
				},
				complete: function() {
					unblock( $form );
					$text_field.val( '' );
					cart.update_cart_totals();
				}
			} );
		},

		/**
		 * Handle when a remove coupon link is clicked.
		 *
		 * @param {Object} evt The JQuery event
		 */
		remove_coupon_clicked: function( evt ) {
			evt.preventDefault();

			var cart = this;
			var $tr = $( evt.target ).parents( 'tr' );
			var coupon = $( evt.target ).attr( 'data-coupon' );

			block( $tr.parents( 'table' ) );

			var data = {
				security: wc_cart_params.remove_coupon_nonce,
				coupon: coupon
			};

			$.ajax( {
				type:    'POST',
				url:      get_url( 'remove_coupon' ),
				data:     data,
				dataType: 'html',
				success: function( response ) {
					show_notice( response );
					unblock( $tr.parents( 'table' ) );
				},
				complete: function() {
					cart.update_cart_totals();
				}
			} );
		},

		/**
		 * Handle a cart Quantity Update
		 *
		 * @param {JQuery Object} $form The cart form.
		 */
		quantity_update: function( $form ) {

			var cart = this;

			// Provide the submit button value because wc-form-handler expects it.
			$( '<input />' ).attr( 'type', 'hidden' )
											.attr( 'name', 'update_cart' )
											.attr( 'value', 'Update Cart' )
											.appendTo( $form );

			block( $form );

			// Make call to actual form post URL.
			$.ajax( {
				type:     $form.attr( 'method' ),
				url:      $form.attr( 'action' ),
				data:     $form.serialize(),
				dataType: 'html',
				success:  update_wc_div,
				complete: function() {
					unblock( $form );
					cart.update_cart_totals();
				}
			} );
		},

		/**
		 * Handle when a remove item link is clicked.
		 *
		 * @param {Object} evt The JQuery event
		 */
		item_remove_clicked: function( evt ) {
			evt.preventDefault();

			var cart = this;
			var $a = $( evt.target );
			var $form = $a.parents( 'form' );

			block( $form );

			$.ajax( {
				type:     'GET',
				url:      $a.attr( 'href' ),
				dataType: 'html',
				success: update_wc_div,
				complete: function() {
					unblock( $form );
					cart.update_cart_totals();
				}
			} );
		}
	};

	cart_shipping.init( cart );
	cart.init();
} );