dojo.provide("dojox.grid._View");

dojo.require("dijit._Widget");
dojo.require("dijit._Templated");
dojo.require("dojox.grid._Builder");
dojo.require("dojox.html.metrics");
dojo.require("dojox.grid.util");

dojo.require("dojo.dnd.Source");
dojo.require("dojo.dnd.Manager");

(function(){
	// private
	var getStyleText = function(inNode, inStyleText){
		return inNode.style.cssText == undefined ? inNode.getAttribute("style") : inNode.style.cssText;
	};

	// public
	dojo.declare('dojox.grid._View', [dijit._Widget, dijit._Templated], {
		// summary:
		//		A collection of grid columns. A grid is comprised of a set of views that stack horizontally.
		//		Grid creates views automatically based on grid's layout structure.
		//		Users should typically not need to access individual views directly.
		//
		// defaultWidth: String
		//		Default width of the view
		defaultWidth: "18em",

		// viewWidth: String
		// 		Width for the view, in valid css unit
		viewWidth: "",

		templatePath: dojo.moduleUrl("dojox.grid","resources/View.html"),
		
		themeable: false,
		classTag: 'dojoxGrid',
		marginBottom: 0,
		rowPad: 2,

		// _togglingColumn: int
		//		Width of the column being toggled (-1 for none)
		_togglingColumn: -1,
		
		postMixInProperties: function(){
			this.rowNodes = [];
		},

		postCreate: function(){
			this.connect(this.scrollboxNode,"onscroll","doscroll");
			dojox.grid.util.funnelEvents(this.contentNode, this, "doContentEvent", [ 'mouseover', 'mouseout', 'click', 'dblclick', 'contextmenu', 'mousedown' ]);
			dojox.grid.util.funnelEvents(this.headerNode, this, "doHeaderEvent", [ 'dblclick', 'mouseover', 'mouseout', 'mousemove', 'mousedown', 'click', 'contextmenu' ]);
			this.content = new dojox.grid._ContentBuilder(this);
			this.header = new dojox.grid._HeaderBuilder(this);
			//BiDi: in RTL case, style width='9000em' causes scrolling problem in head node
			if(!dojo._isBodyLtr()){
				this.headerNodeContainer.style.width = "";
			}
		},

		destroy: function(){
			dojo.destroy(this.headerNode);
			delete this.headerNode;
			dojo.forEach(this.rowNodes, dojo.destroy);
			this.rowNodes = [];
			if(this.source){
				this.source.destroy();
			}
			this.inherited(arguments);
		},

		// focus 
		focus: function(){
			if(dojo.isWebKit || dojo.isOpera){
				this.hiddenFocusNode.focus();
			}else{
				this.scrollboxNode.focus();
			}
		},

		setStructure: function(inStructure){
			var vs = (this.structure = inStructure);
			// FIXME: similar logic is duplicated in layout
			if(vs.width && !isNaN(vs.width)){
				this.viewWidth = vs.width + 'em';
			}else{
				this.viewWidth = vs.width || (vs.noscroll ? 'auto' : this.viewWidth); //|| this.defaultWidth;
			}
			this.onBeforeRow = vs.onBeforeRow;
			this.onAfterRow = vs.onAfterRow;
			this.noscroll = vs.noscroll;
			if(this.noscroll){
				this.scrollboxNode.style.overflow = "hidden";
			}
			this.simpleStructure = Boolean(vs.cells.length == 1);
			// bookkeeping
			this.testFlexCells();
			// accomodate new structure
			this.updateStructure();
		},

		testFlexCells: function(){
			// FIXME: cheater, this function does double duty as initializer and tester
			this.flexCells = false;
			for(var j=0, row; (row=this.structure.cells[j]); j++){
				for(var i=0, cell; (cell=row[i]); i++){
					cell.view = this;
					this.flexCells = this.flexCells || cell.isFlex();
				}
			}
			return this.flexCells;
		},

		updateStructure: function(){
			// header builder needs to update table map
			this.header.update();
			// content builder needs to update markup cache
			this.content.update();
		},

		getScrollbarWidth: function(){
			var hasScrollSpace = this.hasVScrollbar();
			var overflow = dojo.style(this.scrollboxNode, "overflow");
			if(this.noscroll || !overflow || overflow == "hidden"){
				hasScrollSpace = false;
			}else if(overflow == "scroll"){
				hasScrollSpace = true;
			}
			return (hasScrollSpace ? dojox.html.metrics.getScrollbar().w : 0); // Integer
		},

		getColumnsWidth: function(){
			return this.headerContentNode.firstChild.offsetWidth; // Integer
		},

		setColumnsWidth: function(width){
			this.headerContentNode.firstChild.style.width = width + 'px';
			if(this.viewWidth){
				this.viewWidth = width + 'px';
			}
		},

		getWidth: function(){
			return this.viewWidth || (this.getColumnsWidth()+this.getScrollbarWidth()) +'px'; // String
		},

		getContentWidth: function(){
			return Math.max(0, dojo._getContentBox(this.domNode).w - this.getScrollbarWidth()) + 'px'; // String
		},

		render: function(){
			this.scrollboxNode.style.height = '';
			this.renderHeader();
			if(this._togglingColumn >= 0){
				this.setColumnsWidth(this.getColumnsWidth() - this._togglingColumn);
				this._togglingColumn = -1;
			}
			var cells = this.grid.layout.cells;
			var getSibling = dojo.hitch(this, function(node, before){
				var inc = before?-1:1;
				var idx = this.header.getCellNodeIndex(node) + inc;
				var cell = cells[idx];
				while(cell && cell.getHeaderNode() && cell.getHeaderNode().style.display == "none"){
					idx += inc;
					cell = cells[idx];
				}
				if(cell){
					return cell.getHeaderNode();
				}
				return null;
			});
			if(this.grid.columnReordering && this.simpleStructure){
				if(this.source){
					this.source.destroy();
				}
				this.source = new dojo.dnd.Source(this.headerContentNode.firstChild.rows[0], {
					horizontal: true,
					accept: [ "gridColumn_" + this.grid.id ],
					viewIndex: this.index,
					onMouseDown: dojo.hitch(this, function(e){
						this.header.decorateEvent(e);
						if((this.header.overRightResizeArea(e) || this.header.overLeftResizeArea(e)) &&
							this.header.canResize(e) && !this.header.moveable){
							this.header.beginColumnResize(e);
						}else{
							if(this.grid.headerMenu){
								this.grid.headerMenu.onCancel(true);
							}
							// IE reports a left click as 1, where everything else reports 0
							if(e.button === (dojo.isIE ? 1 : 0)){
								dojo.dnd.Source.prototype.onMouseDown.call(this.source, e);
							}
						}
					}),
					_markTargetAnchor: dojo.hitch(this, function(before){
						var src = this.source;
						if(src.current == src.targetAnchor && src.before == before){ return; }
						if(src.targetAnchor && getSibling(src.targetAnchor, src.before)){
							src._removeItemClass(getSibling(src.targetAnchor, src.before), src.before ? "After" : "Before");
						}
						dojo.dnd.Source.prototype._markTargetAnchor.call(src, before);
						if(src.targetAnchor && getSibling(src.targetAnchor, src.before)){
							src._addItemClass(getSibling(src.targetAnchor, src.before), src.before ? "After" : "Before");
						}						
					}),
					_unmarkTargetAnchor: dojo.hitch(this, function(){
						var src = this.source;
						if(!src.targetAnchor){ return; }
						if(src.targetAnchor && getSibling(src.targetAnchor, src.before)){
							src._removeItemClass(getSibling(src.targetAnchor, src.before), src.before ? "After" : "Before");
						}
						dojo.dnd.Source.prototype._unmarkTargetAnchor.call(src);
					}),
					destroy: dojo.hitch(this, function(){
						dojo.disconnect(this._source_conn);
						dojo.unsubscribe(this._source_sub);
						dojo.dnd.Source.prototype.destroy.call(this.source);
					})
				});
				this._source_conn = dojo.connect(this.source, "onDndDrop", this, "_onDndDrop");
				this._source_sub = dojo.subscribe("/dnd/drop/before", this, "_onDndDropBefore");
				this.source.startup();
			}
		},

		_onDndDropBefore: function(source, nodes, copy){
			if(dojo.dnd.manager().target !== this.source){
				return;
			}
			this.source._targetNode = this.source.targetAnchor;
			this.source._beforeTarget = this.source.before;
			var views = this.grid.views.views;
			var srcView = views[source.viewIndex];
			var tgtView = views[this.index];
			if(tgtView != srcView){
				var s = srcView.convertColPctToFixed();
				var t = tgtView.convertColPctToFixed();
				if(s || t){
					setTimeout(function(){
						srcView.update();
						tgtView.update();
					}, 50);
				}
			}
		},

		_onDndDrop: function(source, nodes, copy){
			if(dojo.dnd.manager().target !== this.source){
				if(dojo.dnd.manager().source === this.source){
					this._removingColumn = true;
				}
				return;
			}

			var getIdx = function(n){
				return n ? dojo.attr(n, "idx") : null;
			}
			var w = dojo.marginBox(nodes[0]).w;
			if(source.viewIndex !== this.index){
				var views = this.grid.views.views;
				var srcView = views[source.viewIndex];
				var tgtView = views[this.index];
				if(srcView.viewWidth && srcView.viewWidth != "auto"){
					srcView.setColumnsWidth(srcView.getColumnsWidth() - w);
				}
				if(tgtView.viewWidth && tgtView.viewWidth != "auto"){
					tgtView.setColumnsWidth(tgtView.getColumnsWidth());
				}
			}
			var stn = this.source._targetNode;
			var stb = this.source._beforeTarget;
			var layout = this.grid.layout;
			var idx = this.index;
			delete this.source._targetNode;
			delete this.source._beforeTarget;
			
			window.setTimeout(function(){
				layout.moveColumn(
					source.viewIndex,
					idx,
					getIdx(nodes[0]),
					getIdx(stn),
					stb
				);
			}, 1);
		},

		renderHeader: function(){
			this.headerContentNode.innerHTML = this.header.generateHtml(this._getHeaderContent);
			if(this.flexCells){
				this.contentWidth = this.getContentWidth();
				this.headerContentNode.firstChild.style.width = this.contentWidth;
			}
			dojox.grid.util.fire(this, "onAfterRow", [-1, this.structure.cells, this.headerContentNode]);
		},

		// note: not called in 'view' context
		_getHeaderContent: function(inCell){
			var n = inCell.name || inCell.grid.getCellName(inCell);
			var ret = [ '<div class="dojoxGridSortNode' ];
			
			if(inCell.index != inCell.grid.getSortIndex()){
				ret.push('">');
			}else{
				ret = ret.concat([ ' ',
							inCell.grid.sortInfo > 0 ? 'dojoxGridSortUp' : 'dojoxGridSortDown',
							'"><div class="dojoxGridArrowButtonChar">',
							inCell.grid.sortInfo > 0 ? '&#9650;' : '&#9660;',
							'</div><div class="dojoxGridArrowButtonNode" role="'+(dojo.isFF<3 ? "wairole:" : "")+'presentation"></div>' ]);
			}
			ret = ret.concat([n, '</div>']);
			return ret.join('');
		},

		resize: function(){
			this.adaptHeight();
			this.adaptWidth();
		},

		hasHScrollbar: function(reset){
			if(this._hasHScroll == undefined || reset){
				if(this.noscroll){
					this._hasHScroll = false;
				}else{
					var style = dojo.style(this.scrollboxNode, "overflow");
					if(style == "hidden"){
						this._hasHScroll = false;
					}else if(style == "scroll"){
						this._hasHScroll = true;
					}else{
						this._hasHScroll = (this.scrollboxNode.offsetWidth < this.contentNode.offsetWidth);
					}
				}
			}
			return this._hasHScroll; // Boolean
		},

		hasVScrollbar: function(reset){
			if(this._hasVScroll == undefined || reset){
				if(this.noscroll){
					this._hasVScroll = false;
				}else{
					var style = dojo.style(this.scrollboxNode, "overflow");
					if(style == "hidden"){
						this._hasVScroll = false;
					}else if(style == "scroll"){
						this._hasVScroll = true;
					}else{
						this._hasVScroll = (this.scrollboxNode.offsetHeight < this.contentNode.offsetHeight);
					}
				}
			}
			return this._hasVScroll; // Boolean
		},
		
		convertColPctToFixed: function(){
			// Fix any percentage widths to be pixel values
			var hasPct = false;
			var cellNodes = dojo.query("th", this.headerContentNode);
			var fixedWidths = dojo.map(cellNodes, function(c, vIdx){
				var w = c.style.width;
				dojo.attr(c, "vIdx", vIdx);
				if(w && w.slice(-1) == "%"){
					hasPct = true;
				}else if(w && w.slice(-2) == "px"){
					return window.parseInt(w, 10);
				}
				return dojo.contentBox(c).w;
			});
			if(hasPct){
				dojo.forEach(this.grid.layout.cells, function(cell, idx){
					if(cell.view == this){
						var cellNode = cell.view.getHeaderCellNode(cell.index);
						if(cellNode && dojo.hasAttr(cellNode, "vIdx")){
							var vIdx = window.parseInt(dojo.attr(cellNode, "vIdx"));
							this.setColWidth(idx, fixedWidths[vIdx]);
							cellNodes[vIdx].style.width = cell.unitWidth;
							dojo.removeAttr(cellNode, "vIdx");
						}
					}
				}, this);
				return true;
			}
			return false;
		},

		adaptHeight: function(minusScroll){
			if(!this.grid._autoHeight){
				var h = this.domNode.clientHeight;
				if(minusScroll){
					h -= dojox.html.metrics.getScrollbar().h;
				}
				dojox.grid.util.setStyleHeightPx(this.scrollboxNode, h);
			}
			this.hasVScrollbar(true);
		},

		adaptWidth: function(){
			if(this.flexCells){
				// the view content width
				this.contentWidth = this.getContentWidth();
				this.headerContentNode.firstChild.style.width = this.contentWidth;
			}
			// FIXME: it should be easier to get w from this.scrollboxNode.clientWidth, 
			// but clientWidth seemingly does not include scrollbar width in some cases
			var w = this.scrollboxNode.offsetWidth - this.getScrollbarWidth();
			if(!this._removingColumn){
				w = Math.max(w, this.getColumnsWidth()) + 'px';
			}else{
				w = Math.min(w, this.getColumnsWidth()) + 'px';
				this._removingColumn = false;
			}
			var cn = this.contentNode;
			cn.style.width = w;
			this.hasHScrollbar(true);
		},

		setSize: function(w, h){
			var ds = this.domNode.style;
			var hs = this.headerNode.style;

			if(w){
				ds.width = w;
				hs.width = w;
			}
			ds.height = (h >= 0 ? h + 'px' : '');
		},

		renderRow: function(inRowIndex){
			var rowNode = this.createRowNode(inRowIndex);
			this.buildRow(inRowIndex, rowNode);
			this.grid.edit.restore(this, inRowIndex);
			if(this._pendingUpdate){
				window.clearTimeout(this._pendingUpdate);
			}
			this._pendingUpdate = window.setTimeout(dojo.hitch(this, function(){
				window.clearTimeout(this._pendingUpdate);
				delete this._pendingUpdate;
				this.grid._resize();
			}), 50);
			return rowNode;
		},

		createRowNode: function(inRowIndex){
			var node = document.createElement("div");
			node.className = this.classTag + 'Row';
			dojo.attr(node,"role","row");
			node[dojox.grid.util.gridViewTag] = this.id;
			node[dojox.grid.util.rowIndexTag] = inRowIndex;
			this.rowNodes[inRowIndex] = node;
			return node;
		},

		buildRow: function(inRowIndex, inRowNode){
			this.buildRowContent(inRowIndex, inRowNode);
			this.styleRow(inRowIndex, inRowNode);
		},

		buildRowContent: function(inRowIndex, inRowNode){
			inRowNode.innerHTML = this.content.generateHtml(inRowIndex, inRowIndex); 
			if(this.flexCells && this.contentWidth){
				// FIXME: accessing firstChild here breaks encapsulation
				inRowNode.firstChild.style.width = this.contentWidth;
			}
			dojox.grid.util.fire(this, "onAfterRow", [inRowIndex, this.structure.cells, inRowNode]);
		},

		rowRemoved:function(inRowIndex){
			this.grid.edit.save(this, inRowIndex);
			delete this.rowNodes[inRowIndex];
		},

		getRowNode: function(inRowIndex){
			return this.rowNodes[inRowIndex];
		},

		getCellNode: function(inRowIndex, inCellIndex){
			var row = this.getRowNode(inRowIndex);
			if(row){
				return this.content.getCellNode(row, inCellIndex);
			}
		},

		getHeaderCellNode: function(inCellIndex){
			if(this.headerContentNode){
				return this.header.getCellNode(this.headerContentNode, inCellIndex);
			}
		},

		// styling
		styleRow: function(inRowIndex, inRowNode){
			inRowNode._style = getStyleText(inRowNode);
			this.styleRowNode(inRowIndex, inRowNode);
		},

		styleRowNode: function(inRowIndex, inRowNode){
			if(inRowNode){
				this.doStyleRowNode(inRowIndex, inRowNode);
			}
		},

		doStyleRowNode: function(inRowIndex, inRowNode){
			this.grid.styleRowNode(inRowIndex, inRowNode);
		},

		// updating
		updateRow: function(inRowIndex){
			var rowNode = this.getRowNode(inRowIndex);
			if(rowNode){
				rowNode.style.height = '';
				this.buildRow(inRowIndex, rowNode);
			}
			return rowNode;
		},

		updateRowStyles: function(inRowIndex){
			this.styleRowNode(inRowIndex, this.getRowNode(inRowIndex));
		},

		// scrolling
		lastTop: 0,
		firstScroll:0,

		doscroll: function(inEvent){
			//var s = dojo.marginBox(this.headerContentNode.firstChild);
			var isLtr = dojo._isBodyLtr();
			if(this.firstScroll < 2){
				if((!isLtr && this.firstScroll == 1) || (isLtr && this.firstScroll == 0)){
					var s = dojo.marginBox(this.headerNodeContainer);
					if(dojo.isIE){
						this.headerNodeContainer.style.width = s.w + this.getScrollbarWidth() + 'px';
					}else if(dojo.isMoz){
						//TODO currently only for FF, not sure for safari and opera
						this.headerNodeContainer.style.width = s.w - this.getScrollbarWidth() + 'px';
						//this.headerNodeContainer.style.width = s.w + 'px';
						//set scroll to right in FF
						this.scrollboxNode.scrollLeft = isLtr ?
							this.scrollboxNode.clientWidth - this.scrollboxNode.scrollWidth :
							this.scrollboxNode.scrollWidth - this.scrollboxNode.clientWidth;
					}
				}
				this.firstScroll++;
			}
			this.headerNode.scrollLeft = this.scrollboxNode.scrollLeft;
			// 'lastTop' is a semaphore to prevent feedback-loop with setScrollTop below
			var top = this.scrollboxNode.scrollTop;
			if(top != this.lastTop){
				this.grid.scrollTo(top);
			}
		},

		setScrollTop: function(inTop){
			// 'lastTop' is a semaphore to prevent feedback-loop with doScroll above
			this.lastTop = inTop;
			this.scrollboxNode.scrollTop = inTop;
			return this.scrollboxNode.scrollTop;
		},

		// event handlers (direct from DOM)
		doContentEvent: function(e){
			if(this.content.decorateEvent(e)){
				this.grid.onContentEvent(e);
			}
		},

		doHeaderEvent: function(e){
			if(this.header.decorateEvent(e)){
				this.grid.onHeaderEvent(e);
			}
		},

		// event dispatch(from Grid)
		dispatchContentEvent: function(e){
			return this.content.dispatchEvent(e);
		},

		dispatchHeaderEvent: function(e){
			return this.header.dispatchEvent(e);
		},

		// column resizing
		setColWidth: function(inIndex, inWidth){
			this.grid.setCellWidth(inIndex, inWidth + 'px');
		},

		update: function(){
			this.content.update();
			this.grid.update();
			//get scroll after update or scroll left setting goes wrong on IE.
			//See trac: #8040
			var left = this.scrollboxNode.scrollLeft;
			this.scrollboxNode.scrollLeft = left;
			this.headerNode.scrollLeft = left;
		}
	});

	dojo.declare("dojox.grid._GridAvatar", dojo.dnd.Avatar, {
		construct: function(){
			var dd = dojo.doc;

			var a = dd.createElement("table");
			a.cellPadding = a.cellSpacing = "0";
			a.className = "dojoxGridDndAvatar";
			a.style.position = "absolute";
			a.style.zIndex = 1999;
			a.style.margin = "0px"; // to avoid dojo.marginBox() problems with table's margins
			var b = dd.createElement("tbody");
			var tr = dd.createElement("tr");
			var td = dd.createElement("td");
			var img = dd.createElement("td");
			tr.className = "dojoxGridDndAvatarItem";
			img.className = "dojoxGridDndAvatarItemImage";
			img.style.width = "16px";
			var source = this.manager.source, node;
			if(source.creator){
				// create an avatar representation of the node
				node = source._normailzedCreator(source.getItem(this.manager.nodes[0].id).data, "avatar").node;
			}else{
				// or just clone the node and hope it works
				node = this.manager.nodes[0].cloneNode(true);
				if(node.tagName.toLowerCase() == "tr"){
					// insert extra table nodes
					var table = dd.createElement("table"),
						tbody = dd.createElement("tbody");
					tbody.appendChild(node);
					table.appendChild(tbody);
					node = table;
				}else if(node.tagName.toLowerCase() == "th"){
					// insert extra table nodes
					var table = dd.createElement("table"),
						tbody = dd.createElement("tbody"),
						r = dd.createElement("tr");
					table.cellPadding = table.cellSpacing = "0";
					r.appendChild(node);
					tbody.appendChild(r);
					table.appendChild(tbody);
					node = table;
				}
			}
			node.id = "";
			td.appendChild(node);
			tr.appendChild(img);
			tr.appendChild(td);
			dojo.style(tr, "opacity", 0.9);
			b.appendChild(tr);

			a.appendChild(b);
			this.node = a;

			var m = dojo.dnd.manager();
			this.oldOffsetY = m.OFFSET_Y;
			m.OFFSET_Y = 1;
		},
		destroy: function(){
			dojo.dnd.manager().OFFSET_Y = this.oldOffsetY;
			this.inherited(arguments);
		}
	});

	var oldMakeAvatar = dojo.dnd.manager().makeAvatar;
	dojo.dnd.manager().makeAvatar = function(){
		var src = this.source;
		if(src.viewIndex !== undefined){
			return new dojox.grid._GridAvatar(this);
		}
		return oldMakeAvatar.call(dojo.dnd.manager());
	}
})();