(function(SKY,$){

	var defaultOptions = {
			url: null,
			rows: [],
			columns: [],
			pagification: {
				rows: 25,
			},
			select: null,
		};
	var defaultColumn = {
			type: "string",

		};

	class HTML {
		constructor(skyTable, table){
			this.skyTable = skyTable;
			this.table = table;
			this.head = $("<thead></thead>").appendTo(table);
			this.body = $("<tbody></tbody>").appendTo(table);
			this.footer = $("<tfooter></tfooter>").appendTo(table);

			this.rowCache = [];
			this.usedRows = {};
		}
		createRow(){
			var self = this;
			var row = $("<tr></tr>")
				.addClass("skytable skytable-row")
				.on("click", function(){
					self.skyTable.fireRowClick($(this));
				})
				.on("dblclick", function(){
					self.skyTable.fireRowDblClick($(this));
				});

			for (var n=0;n<this.skyTable.columns.length;n++){
				$("<td></td>")
					.addClass("skytable skytable-cell")
					.appendTo(row);
			}
			return row.get(0);
		}
		attachDataRow(iRow){
			if (this.rowCache.length == 0)
				this.rowCache.push(this.createRow());

			var row = this.skyTable.data.rows[iRow];
			var htmlRow = $(this.rowCache.pop());

			htmlRow.data( "data-row", row );
			htmlRow.data( "data-row-index", iRow );

			var cells = $("td", htmlRow);

			for (var n=0;n<this.skyTable.columns.length;n++){
				$(cells[n])
					.text( this.skyTable.columns[n].type.render( row[this.skyTable.columns[n].key] ) );
			}
			htmlRow.appendTo(this.body);
			this.usedRows[iRow] = htmlRow;
		}
		detachDataRow(iRow){
			if (this.usedRows[iRow])
			{
				$(this.usedRows[iRow]).detach();
				this.rowCache.push(this.usedRows[iRow]);
			}
		}
		get(iRow){
			return this.usedRows[iRow];
		}

		empty(){
			for (var iRow in this.usedRows){
				var htmlRow = me.html.usedRows[iRow];
				$(htmlRow).detach();
				this.rowCache.push(htmlRow);
			}
			this.usedRows = {};
		}

		initializeHeader(){
			this.columnHeader = $("<tr></tr>")
				.addClass("skytable skytable-head")
				.appendTo(this.head);

			for (var n=0;n<this.skyTable.columns.length;n++){
				$("<td></td>")
					.text(this.skyTable.columns[n].label)
					.addClass("skytable skytable-head")
					.appendTo(this.columnHeader);
			}
		}
	}
	class DATA {
		constructor(skyTable){
			this.skyTable = skyTable;
			this.rows= skyTable.options.rows;
			this.firstrow = 0;
			this.selectedRows = [];
		}
		getLastRow(){
			var lastRow = this.firstrow + this.skyTable.options.pagification.rows;
			if (lastRow > this.rows.length)
				lastRow = this.rows.length;
			return lastRow;
		}
		deselect(iRow){
			var si = this.selectedRows.indexOf(iRow);
			if (si != -1)
			{
				this.selectedRows.splice(si,1);
				var htmlRow = this.skyTable.html.get(iRow);
				if (htmlRow)
					$(htmlRow).removeClass("selected");
				this.skyTable.fire("deselect", { index: iRow, row: this.rows[iRow] } );
			}
		}
		select(iRow){
			if (!this.selectedRows.includes(iRow)){
				this.selectedRows.push(iRow);
				var htmlRow = this.skyTable.html.get(iRow);
				if (htmlRow)
					$(htmlRow).addClass("selected");

				this.skyTable.fire("select", { index: iRow, row: this.rows[iRow] } );
			}
		}
		toggleSelect(iRow){
			if (this.skyTable.options.select == "single")
			{
				var doSelection = (!this.selectedRows.includes(iRow));
				while (this.selectedRows.length)
					this.deselect(this.selectedRows[0]);
				if (doSelection)
					this.select(iRow);
			} else if (this.skyTable.options.select == "multi")
			{
				if (!this.selectedRows.includes(iRow))
					this.select(iRow);
				else
					this.deselect(iRow);
			}
		}
	}


	$.fn.skyTable = function(opt){
		if (this.length != 1)
			throw "SkyTable must be constructed on exactly one <table>";

		var self = this.get(0);
		if (self.tagName != "TABLE")
			self = this.parents("table").get(0);

		if (!self)
			throw "can't identify skyTable Element";

		var skyTable = $(self).data( "sky.skyTable");
		if (skyTable){
			if (arguments.length)
				throw "can't reinitialize SkyTable without prior destroy()";
			return skyTable;
		}

		class SkyTable extends SKY.prototypes.SKYBase{

			constructor(t){
				super();
				var me = this;

				this.options = Object.assign( {}, defaultOptions, opt );
				this.columns = []

				t = $(t);
				t	.data( "sky.skyTable", this)
					.addClass("skytable");

				this.html = new HTML(this, t);
				this.data = new DATA(this);

				for (var key in this.options.columns){
					var column = this.options.columns[key];
					var skyColumn = Object.assign( {}, defaultColumn, column );
					skyColumn.type = SKY.controls.getControl(skyColumn.type);
					this.columns.push( skyColumn );
				}

				this.html.initializeHeader();
				this.refresh();
			}

			reset(){
				me.html.empty();
			}

			rows(rows){
				if (arguments.length == 0)
					return me.currentRows;

				me.reset();
			}

			refresh(){
				this.html.empty();

				var lastRow = this.data.getLastRow();
				for (var n = this.data.firstrow;n < lastRow; n++){
					this.html.attachDataRow( n );
				}
				return this;
			}
			
			fireRowClick(row){
				if (this.options.select)
					this.data.toggleSelect( row.data("data-row-index") );
				else
					this.fire( "click", { index: row.data("data-row-index") , row: row.data("data-row") });
			}
			fireRowDblClick(row){
				this.fire( "dblclick", { index: row.data("data-row-index") , row: row.data("data-row") });	
			}
		}

		return new SkyTable(self);
	};

}(SKY,jQuery));