/* global htmlSettingsTaxLocalizeScript */
/**
 * Used by woocommerce/includes/admin/settings/views/html-settings-tax.php
 */

(function($, data, wp){
	$(function() {

		if ( ! String.prototype.trim ) {
			String.prototype.trim = function () {
				return this.replace( /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '' );
			};
		}

		var rowTemplate        = wp.template( 'wc-tax-table-row' ),
			rowTemplateEmpty   = wp.template( 'wc-tax-table-row-empty' ),
			paginationTemplate = wp.template( 'wc-tax-table-pagination' ),
			$table             = $( '.wc_tax_rates' ),
			$tbody             = $( '#rates' ),
			$unsaved_msg       = $( '#unsaved-changes' ),
			$pagination        = $( '#rates-pagination' ),
			$search_field      = $( '#rates-search .wc-tax-rates-search-field' ),
			WCTaxTableModelConstructor = Backbone.Model.extend({
				changes : {},
				setRateAttribute : function( rateID, attribute, value ) {
					var rates   = _.indexBy( this.get( 'rates' ), 'tax_rate_id' ),
						changes = {};

					if ( rates[ rateID ][ attribute ] !== value ) {
						changes[ rateID ] = {};
						changes[ rateID ][ attribute ] = value;
						rates[ rateID ][ attribute ]   = value;
					}

					this.logChanges( changes );
				},
				logChanges : function( changedRows ) {
					var changes = this.changes || {};

					_.each( changedRows, function( row, id ) {
						changes[ id ] = _.extend( changes[ id ] || { tax_rate_id : id }, row );
					} );

					this.changes = changes;
					this.trigger( 'change:rates' );
				},
				getFilteredRates : function() {
					var rates  = this.get( 'rates' ),
						search = $search_field.val().toLowerCase();

					if ( search.length ) {
						rates = _.filter( rates, function( rate ) {
							var search_text = _.toArray( rate ).join( ' ' ).toLowerCase();
							return ( -1 !== search_text.indexOf( search ) );
						} );
					}

					rates = _.sortBy( rates, function( rate ) {
						return parseInt( rate.tax_rate_order, 10 );
					} );

					return rates;
				}
			} ),
			WCTaxTableViewConstructor  = Backbone.View.extend({
				rowTemplate : rowTemplate,
				per_page    : data.limit,
				page        : data.page,
				initialize : function() {
					this.qty_pages = Math.ceil( _.toArray( this.model.get( 'rates' ) ).length / this.per_page );
					this.page = this.sanitizePage( data.page );

					this.listenTo( this.model, 'change:rates', this.setUnloadConfirmation );
					//	this.listenTo( this.model, 'saved:rates', this.clearUnloadConfirmation );
					$tbody.on( 'change', { view : this }, this.updateModelOnChange );
					$tbody.on( 'sortupdate', { view : this }, this.updateModelOnSort );
					$search_field.on( 'keyup search', { view : this }, this.onSearchField );
					$pagination.on( 'click', 'a', { view : this }, this.onPageChange );
					$pagination.on( 'change', 'input', { view : this }, this.onPageChange );
					$(window).on( 'beforeunload', { view : this }, this.unloadConfirmation );

					// Can bind these directly to the buttons, as they won't get overwritten.
					$table.find('.insert').on( 'click', { view : this }, this.onAddNewRow );
					$table.find('.remove_tax_rates').on( 'click', { view : this }, this.onDeleteRow );
				},
				render : function() {
					var rates       = this.model.getFilteredRates(),
						qty_rates   = _.size( rates ),
						qty_pages   = Math.ceil( qty_rates / this.per_page ),
						first_index = this.per_page * ( this.page - 1),
						last_index  = this.per_page * this.page,
						paged_rates = _.toArray( rates ).slice( first_index, last_index ),
						view        = this;

					// Blank out the contents.
					this.$el.empty();

					if ( paged_rates.length ) {
						// Populate $tbody with the current page of results.
						$.each( paged_rates, function ( id, rowData ) {
							view.$el.append( view.rowTemplate( rowData ) );
						} );
					} else {
						view.$el.append( rowTemplateEmpty() );
					}

					// Initialize autocomplete for countries.
					this.$el.find( 'td.country input' ).autocomplete({
						source: data.countries,
						minLength: 2
					});

					// Initialize autocomplete for states.
					this.$el.find( 'td.state input' ).autocomplete({
						source: data.states,
						minLength: 3
					});

					// Postcode and city don't have `name` values by default. They're only created if the contents changes, to save on database queries (I think)
					this.$el.find( 'td.postcode input, td.city input' ).change(function() {
						$(this).attr( 'name', $(this).data( 'name' ) );
					});

					if ( qty_pages > 1 ) {
						// We've now displayed our initial page, time to render the pagination box.
						$pagination.html( paginationTemplate( {
							qty_rates    : qty_rates,
							current_page : this.page,
							qty_pages    : qty_pages
						} ) );
					}

					// Disable sorting if there is a search term filtering the items.
					if ( $search_field.val() ) {
						$tbody.sortable( 'disable' );
					} else {
						$tbody.sortable( 'enable' );
					}
				},
				updateUrl : function() {
					if ( ! window.history.replaceState ) {
						return;
					}

					var url    = data.base_url,
						search = $search_field.val();

					if ( 1 < this.page ) {
						url += '&p=' + encodeURIComponent( this.page );
					}

					if ( search.length ) {
						url += '&s=' + encodeURIComponent( search );
					}

					window.history.replaceState( {}, '', url );
				},
				onAddNewRow : function( event ) {
					var view    = event.data.view,
						model   = view.model,
						rates   = _.indexBy( model.get('rates'), 'tax_rate_id' ),
						changes = {},
						size    = _.size( rates ),
						newRow  = _.extend( {}, data.default_rate, {
							tax_rate_id : 'new-' + size + '-' + Date.now(),
							newRow      : true
						} ),
						current_id, current_order;

					event.preventDefault();

					if ( $current = $tbody.children( '.current' ) ) {
						current_id    = $current.last().data( 'id' );
						current_order = parseInt( rates[ current_id ].tax_rate_order, 10 );
						newRow.tax_rate_order = 1 + current_order;

						rates_to_reorder = _.filter( rates, function( rate ) {
							if ( parseInt( rate.tax_rate_order, 10 ) > current_order ) {
								return true;
							}
							return false;
						} );

						reordered_rates = _.map( rates_to_reorder, function( rate ) {
							rate.tax_rate_order++;
							changes[ rate.tax_rate_id ] = _.extend( changes[ rate.tax_rate_id ] || {}, { tax_rate_order : rate.tax_rate_order } );
							return rate;
						} );
					} else {
						newRow.tax_rate_order = 1 + _.max(
							_.pluck( rates, 'tax_rate_order' ),
							function ( val ) {
								// Cast them all to integers, because strings compare funky. Sighhh.
								return parseInt( val, 10 );
							}
						);
					}

					rates[ newRow.tax_rate_id ]   = newRow;
					changes[ newRow.tax_rate_id ] = newRow;

					model.set( 'rates', rates );
					model.logChanges( changes );

					view.render();
				},
				onDeleteRow : function() {
					if ( $tbody.find('tr.current').length > 0 ) {
						var $current = $tbody.find('tr.current');
						$current.find('input').val('');
						$current.find('input.remove_tax_rate').val('1');

						$current.each(function(){
							if ( $(this).is('.new') ) {
								$( this ).remove();
							} else {
								$( this ).hide();
							}
						});
					} else {
						window.alert( data.strings.no_rows_selected );
					}
					return false;
				},
				onSearchField : function( event ){
					event.data.view.updateUrl();
					event.data.view.render();
				},
				onPageChange : function( event ) {
					var $target  = $( event.currentTarget );

					event.preventDefault();
					event.data.view.page = $target.data('goto') ? $target.data('goto') : $target.val();
					event.data.view.render();
					event.data.view.updateUrl();
				},
				setUnloadConfirmation : function() {
					this.needsUnloadConfirm = true;
					$unsaved_msg.show();
					$unsaved_msg.find( 'pre' ).text( JSON.stringify( this.model.changes, null, '\t' ) );
				},
				clearUnloadConfirmation : function() {
					this.needsUnloadConfirm = false;
					$unsaved_msg.hide();
				},
				unloadConfirmation : function(event) {
					if ( event.data.view.needsUnloadConfirm ) {
						event.returnValue = data.strings.unload_confirmation_msg;
						window.event.returnValue = data.strings.unload_confirmation_msg;
						return data.strings.unload_confirmation_msg;
					}
				},
				updateModelOnChange : function( event ) {
					var model     = event.data.view.model,
						$target   = $( event.target ),
						id        = $target.closest('tr').data('id'),
						attribute = $target.data('attribute'),
						val       = $target.val();

					if ( 'city' === attribute || 'postcode' === attribute ) {
						val = val.split(';');
						val = $.map( val, function( thing ) {
							return thing.trim();
						});
					}

					if ( 'tax_rate_compound' === attribute || 'tax_rate_shipping' === attribute ) {
						if ( $target.is(':checked') ) {
							val = 1;
						} else {
							val = 0;
						}
					}

					model.setRateAttribute( id, attribute, val );
				},
				updateModelOnSort : function( event, ui ) {
					var view         = event.data.view,
						model        = view.model,
						$tr          = ui.item,
						tax_rate_id  = $tr.data( 'id' ),
						rates        = _.indexBy( model.get('rates'), 'tax_rate_id' ),
						old_position = rates[ tax_rate_id ].tax_rate_order,
						new_position = $tr.index() + ( ( view.page - 1 ) * view.per_page ),
						which_way    = ( new_position > old_position ) ? 'higher' : 'lower',
						changes      = {},
						rates_to_reorder, reordered_rates;

					rates_to_reorder = _.filter( rates, function( rate ) {
						var order  = parseInt( rate.tax_rate_order, 10 ),
							limits = [ old_position, new_position ];

						if ( parseInt( rate.tax_rate_id, 10 ) === parseInt( tax_rate_id, 10 ) ) {
							return true;
						} else if ( order > _.min( limits ) && order < _.max( limits ) ) {
							return true;
						} else if ( 'higher' === which_way && order === _.max( limits ) ) {
							return true;
						} else if ( 'lower' === which_way && order === _.min( limits ) ) {
							return true;
						}
						return false;
					} );

					reordered_rates = _.map( rates_to_reorder, function( rate ) {
						var order = parseInt( rate.tax_rate_order, 10 );

						if ( parseInt( rate.tax_rate_id, 10 ) === parseInt( tax_rate_id, 10 ) ) {
							rate.tax_rate_order = new_position;
						} else if ( 'higher' === which_way ) {
							rate.tax_rate_order = order - 1;
						} else if ( 'lower' === which_way ) {
							rate.tax_rate_order = order + 1;
						}

						changes[ rate.tax_rate_id ] = _.extend( changes[ rate.tax_rate_id ] || {}, { tax_rate_order : rate.tax_rate_order } );

						return rate;
					} );

					if ( reordered_rates.length ) {
						model.logChanges( changes );
						view.render(); // temporary, probably should get yanked.
					}
				},
				sanitizePage : function( page_num ) {
					page_num = parseInt( page_num, 10 );
					if ( page_num < 1 ) {
						page_num = 1;
					} else if ( page_num > this.qty_pages ) {
						page_num = this.qty_pages;
					}
					return page_num;
				}
			} ),
			WCTaxTableModelInstance = new WCTaxTableModelConstructor({
				rates : data.rates
			} ),
			WCTaxTableInstance = new WCTaxTableViewConstructor({
				model    : WCTaxTableModelInstance,
			//	page     : data.page,  // I'd prefer to have these two specified down here in the instance,
			//	per_page : data.limit, // but it doesn't seem to recognize them in render if I do. :\
				el       : '#rates'
			} );

		WCTaxTableInstance.render();

		/**
		 * Handle the exporting of tax rates, and build it off the global `data.rates` object.
		 *
		 * @todo: Have the `export` button save the current form and generate this from php, so there's no chance the current page is out of date.
		 */
		$table.find('.export').click(function() {
			var csv_data = 'data:application/csv;charset=utf-8,' + data.strings.csv_data_cols.join(',') + '\n';

			$.each( data.rates, function( id, rowData ) {
				var row = '';

				row += rowData.tax_rate_country  + ',';
				row += rowData.tax_rate_state    + ',';
				row += rowData.tax_rate_postcode ? rowData.tax_rate_postcode.join( '; ' ) : '' + ',';
				row += rowData.tax_rate_city     ? rowData.tax_rate_city.join( '; ' )     : '' + ',';
				row += rowData.tax_rate          + ',';
				row += rowData.tax_rate_name     + ',';
				row += rowData.tax_rate_priority + ',';
				row += rowData.tax_rate_compound + ',';
				row += rowData.tax_rate_shipping + ',';
				row += data.current_class;

				csv_data += row + '\n';
			});

			$(this).attr( 'href', encodeURI( csv_data ) );

			return true;
		});

	});
})(jQuery, htmlSettingsTaxLocalizeScript, wp);