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

dojo.require("dojox.grid.util");

dojo.declare("dojox.grid._EditManager", null, {
	// summary:
	//		Controls grid cell editing process. Owned by grid and used internally for editing.
	constructor: function(inGrid){
		// inGrid: dojox.Grid
		//		The dojox.Grid this editor should be attached to
		this.grid = inGrid;
		this.connections = [];
		if(dojo.isIE){
			this.connections.push(dojo.connect(document.body, "onfocus", dojo.hitch(this, "_boomerangFocus")));
		}
	},
	
	info: {},

	destroy: function(){
		dojo.forEach(this.connections,dojo.disconnect);
	},

	cellFocus: function(inCell, inRowIndex){
		// summary:
		//		Invoke editing when cell is focused
		// inCell: cell object
		//		Grid cell object
		// inRowIndex: Integer
		//		Grid row index
		if(this.grid.singleClickEdit || this.isEditRow(inRowIndex)){
			// if same row or quick editing, edit
			this.setEditCell(inCell, inRowIndex);
		}else{
			// otherwise, apply any pending row edits
			this.apply();
		}
		// if dynamic or static editing...
		if(this.isEditing() || (inCell && inCell.editable && inCell.alwaysEditing)){
			// let the editor focus itself as needed
			this._focusEditor(inCell, inRowIndex);
		}
	},

	rowClick: function(e){
		if(this.isEditing() && !this.isEditRow(e.rowIndex)){
			this.apply();
		}
	},

	styleRow: function(inRow){
		if(inRow.index == this.info.rowIndex){
			inRow.customClasses += ' dojoxGridRowEditing';
		}
	},

	dispatchEvent: function(e){
		var c = e.cell, ed = (c && c["editable"]) ? c : 0;
		return ed && ed.dispatchEvent(e.dispatch, e);
	},

	// Editing
	isEditing: function(){
		// summary:
		//		Indicates editing state of the grid.
		// returns: Boolean
		//	 	True if grid is actively editing
		return this.info.rowIndex !== undefined;
	},

	isEditCell: function(inRowIndex, inCellIndex){
		// summary:
		//		Indicates if the given cell is being edited.
		// inRowIndex: Integer
		//		Grid row index
		// inCellIndex: Integer
		//		Grid cell index
		// returns: Boolean
		//	 	True if given cell is being edited
		return (this.info.rowIndex === inRowIndex) && (this.info.cell.index == inCellIndex);
	},

	isEditRow: function(inRowIndex){
		// summary:
		//		Indicates if the given row is being edited.
		// inRowIndex: Integer
		//		Grid row index
		// returns: Boolean
		//	 	True if given row is being edited
		return this.info.rowIndex === inRowIndex;
	},

	setEditCell: function(inCell, inRowIndex){
		// summary:
		//		Set the given cell to be edited
		// inRowIndex: Integer
		//		Grid row index
		// inCell: Object
		//		Grid cell object
		if(!this.isEditCell(inRowIndex, inCell.index) && this.grid.canEdit && this.grid.canEdit(inCell, inRowIndex)){
			this.start(inCell, inRowIndex, this.isEditRow(inRowIndex) || inCell.editable);
		}
	},

	_focusEditor: function(inCell, inRowIndex){
		dojox.grid.util.fire(inCell, "focus", [inRowIndex]);
	},

	focusEditor: function(){
		if(this.isEditing()){
			this._focusEditor(this.info.cell, this.info.rowIndex);
		}
	},

	// implement fix for focus boomerang effect on IE
	_boomerangWindow: 500,
	_shouldCatchBoomerang: function(){
		return this._catchBoomerang > new Date().getTime();
	},
	_boomerangFocus: function(){
		//console.log("_boomerangFocus");
		if(this._shouldCatchBoomerang()){
			// make sure we don't utterly lose focus
			this.grid.focus.focusGrid();
			// let the editor focus itself as needed
			this.focusEditor();
			// only catch once
			this._catchBoomerang = 0;
		}
	},
	_doCatchBoomerang: function(){
		// give ourselves a few ms to boomerang IE focus effects
		if(dojo.isIE){this._catchBoomerang = new Date().getTime() + this._boomerangWindow;}
	},
	// end boomerang fix API

	start: function(inCell, inRowIndex, inEditing){
		if(!this._isValidInput()){
			return;
		}
		this.grid.beginUpdate();
		this.editorApply();
		if(this.isEditing() && !this.isEditRow(inRowIndex)){
			this.applyRowEdit();
			this.grid.updateRow(inRowIndex);
		}
		if(inEditing){
			this.info = { cell: inCell, rowIndex: inRowIndex };
			this.grid.doStartEdit(inCell, inRowIndex); 
			this.grid.updateRow(inRowIndex);
		}else{
			this.info = {};
		}
		this.grid.endUpdate();
		// make sure we don't utterly lose focus
		this.grid.focus.focusGrid();
		// let the editor focus itself as needed
		this._focusEditor(inCell, inRowIndex);
		// give ourselves a few ms to boomerang IE focus effects
		this._doCatchBoomerang();
	},

	_editorDo: function(inMethod){
		var c = this.info.cell;
		//c && c.editor && c.editor[inMethod](c, this.info.rowIndex);
		if(c && c.editable){
			c[inMethod](this.info.rowIndex);
		}
	},

	editorApply: function(){
		this._editorDo("apply");
	},

	editorCancel: function(){
		this._editorDo("cancel");
	},

	applyCellEdit: function(inValue, inCell, inRowIndex){
		if(this.grid.canEdit(inCell, inRowIndex)){
			this.grid.doApplyCellEdit(inValue, inRowIndex, inCell.field);
		}
	},

	applyRowEdit: function(){
		this.grid.doApplyEdit(this.info.rowIndex, this.info.cell.field);
	},

	apply: function(){
		// summary:
		//		Apply a grid edit
		if(this.isEditing() && this._isValidInput()){
			this.grid.beginUpdate();
			this.editorApply();
			this.applyRowEdit();
			this.info = {};
			this.grid.endUpdate();
			this.grid.focus.focusGrid();
			this._doCatchBoomerang();
		}
	},

	cancel: function(){
		// summary:
		//		Cancel a grid edit
		if(this.isEditing()){
			this.grid.beginUpdate();
			this.editorCancel();
			this.info = {};
			this.grid.endUpdate();
			this.grid.focus.focusGrid();
			this._doCatchBoomerang();
		}
	},

	save: function(inRowIndex, inView){
		// summary:
		//		Save the grid editing state
		// inRowIndex: Integer
		//		Grid row index
		// inView: Object
		//		Grid view
		var c = this.info.cell;
		if(this.isEditRow(inRowIndex) && (!inView || c.view==inView) && c.editable){
			c.save(c, this.info.rowIndex);
		}
	},

	restore: function(inView, inRowIndex){
		// summary:
		//		Restores the grid editing state
		// inRowIndex: Integer
		//		Grid row index
		// inView: Object
		//		Grid view
		var c = this.info.cell;
		if(this.isEditRow(inRowIndex) && c.view == inView && c.editable){
			c.restore(c, this.info.rowIndex);
		}
	},
	
	_isValidInput: function(){
		var w = (this.info.cell || {}).widget;		
		if(!w || !w.isValid){
			//no validation needed
			return true;
		}		
		w.focused = true;
		return w.isValid(true);
	}
});
