/* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
----------------------------------------------------------------------------------------------------------------------*/

function DayGrid(view) {
	Grid.call(this, view); // call the super-constructor
}


DayGrid.prototype = createObject(Grid.prototype); // declare the super-class
$.extend(DayGrid.prototype, {

	numbersVisible: false, // should render a row for day/week numbers? manually set by the view
	cellDuration: moment.duration({ days: 1 }), // required for Grid.event.js. Each cell is always a single day
	bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid

	rowEls: null, // set of fake row elements
	dayEls: null, // set of whole-day elements comprising the row's background
	helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"
	highlightEls: null, // set of cell skeleton elements for rendering the highlight


	// Renders the rows and columns into the component's `this.el`, which should already be assigned.
	// isRigid determins whether the individual rows should ignore the contents and be a constant height.
	// Relies on the view's colCnt and rowCnt. In the future, this component should probably be self-sufficient.
	render: function(isRigid) {
		var view = this.view;
		var html = '';
		var row;

		for (row = 0; row < view.rowCnt; row++) {
			html += this.dayRowHtml(row, isRigid);
		}
		this.el.html(html);

		this.rowEls = this.el.find('.fc-row');
		this.dayEls = this.el.find('.fc-day');

		// run all the day cells through the dayRender callback
		this.dayEls.each(function(i, node) {
			var date = view.cellToDate(Math.floor(i / view.colCnt), i % view.colCnt);
			view.trigger('dayRender', null, date, $(node));
		});

		Grid.prototype.render.call(this); // call the super-method
	},


	destroy: function() {
		this.destroySegPopover();
	},


	// Generates the HTML for a single row. `row` is the row number.
	dayRowHtml: function(row, isRigid) {
		var view = this.view;
		var classes = [ 'fc-row', 'fc-week', view.widgetContentClass ];

		if (isRigid) {
			classes.push('fc-rigid');
		}

		return '' +
			'<div class="' + classes.join(' ') + '">' +
				'<div class="fc-bg">' +
					'<table>' +
						this.rowHtml('day', row) + // leverages RowRenderer. calls dayCellHtml()
					'</table>' +
				'</div>' +
				'<div class="fc-content-skeleton">' +
					'<table>' +
						(this.numbersVisible ?
							'<thead>' +
								this.rowHtml('number', row) + // leverages RowRenderer. View will define render method
							'</thead>' :
							''
							) +
					'</table>' +
				'</div>' +
			'</div>';
	},


	// Renders the HTML for a whole-day cell. Will eventually end up in the day-row's background.
	// We go through a 'day' row type instead of just doing a 'bg' row type so that the View can do custom rendering
	// specifically for whole-day rows, whereas a 'bg' might also be used for other purposes (TimeGrid bg for example).
	dayCellHtml: function(row, col, date) {
		return this.bgCellHtml(row, col, date);
	},


	/* Coordinates & Cells
	------------------------------------------------------------------------------------------------------------------*/


	// Populates the empty `rows` and `cols` arrays with coordinates of the cells. For CoordGrid.
	buildCoords: function(rows, cols) {
		var colCnt = this.view.colCnt;
		var e, n, p;

		this.dayEls.slice(0, colCnt).each(function(i, _e) { // iterate the first row of day elements
			e = $(_e);
			n = e.offset().left;
			if (i) {
				p[1] = n;
			}
			p = [ n ];
			cols[i] = p;
		});
		p[1] = n + e.outerWidth();

		this.rowEls.each(function(i, _e) {
			e = $(_e);
			n = e.offset().top;
			if (i) {
				p[1] = n;
			}
			p = [ n ];
			rows[i] = p;
		});
		p[1] = n + e.outerHeight() + this.bottomCoordPadding; // hack to extend hit area of last row
	},


	// Converts a cell to a date
	getCellDate: function(cell) {
		return this.view.cellToDate(cell); // leverages the View's cell system
	},


	// Gets the whole-day element associated with the cell
	getCellDayEl: function(cell) {
		return this.dayEls.eq(cell.row * this.view.colCnt + cell.col);
	},


	// Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
	rangeToSegs: function(start, end) {
		return this.view.rangeToSegments(start, end); // leverages the View's cell system
	},


	/* Event Drag Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event hovering over the given date(s).
	// `end` can be null, as well as `seg`. See View's documentation on renderDrag for more info.
	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(start, end, seg) {
		var opacity;

		// always render a highlight underneath
		this.renderHighlight(
			start,
			end || this.view.calendar.getDefaultEventEnd(true, start)
		);

		// if a segment from the same calendar but another component is being dragged, render a helper event
		if (seg && !seg.el.closest(this.el).length) {

			this.renderRangeHelper(start, end, seg);

			opacity = this.view.opt('dragOpacity');
			if (opacity !== undefined) {
				this.helperEls.css('opacity', opacity);
			}

			return true; // a helper has been rendered
		}
	},


	// Unrenders any visual indication of a hovering event
	destroyDrag: function() {
		this.destroyHighlight();
		this.destroyHelper();
	},


	/* Event Resize Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being resized
	renderResize: function(start, end, seg) {
		this.renderHighlight(start, end);
		this.renderRangeHelper(start, end, seg);
	},


	// Unrenders a visual indication of an event being resized
	destroyResize: function() {
		this.destroyHighlight();
		this.destroyHelper();
	},


	/* Event Helper
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
	renderHelper: function(event, sourceSeg) {
		var helperNodes = [];
		var rowStructs = this.renderEventRows([ event ]);

		// inject each new event skeleton into each associated row
		this.rowEls.each(function(row, rowNode) {
			var rowEl = $(rowNode); // the .fc-row
			var skeletonEl = $('<div class="fc-helper-skeleton"><table/></div>'); // will be absolutely positioned
			var skeletonTop;

			// If there is an original segment, match the top position. Otherwise, put it at the row's top level
			if (sourceSeg && sourceSeg.row === row) {
				skeletonTop = sourceSeg.el.position().top;
			}
			else {
				skeletonTop = rowEl.find('.fc-content-skeleton tbody').position().top;
			}

			skeletonEl.css('top', skeletonTop)
				.find('table')
					.append(rowStructs[row].tbodyEl);

			rowEl.append(skeletonEl);
			helperNodes.push(skeletonEl[0]);
		});

		this.helperEls = $(helperNodes); // array -> jQuery set
	},


	// Unrenders any visual indication of a mock helper event
	destroyHelper: function() {
		if (this.helperEls) {
			this.helperEls.remove();
			this.helperEls = null;
		}
	},


	/* Highlighting
	------------------------------------------------------------------------------------------------------------------*/


	// Renders an emphasis on the given date range. `start` is an inclusive, `end` is exclusive.
	renderHighlight: function(start, end) {
		var segs = this.rangeToSegs(start, end);
		var highlightNodes = [];
		var i, seg;
		var el;

		// build an event skeleton for each row that needs it
		for (i = 0; i < segs.length; i++) {
			seg = segs[i];
			el = $(
				this.highlightSkeletonHtml(seg.leftCol, seg.rightCol + 1) // make end exclusive
			);
			el.appendTo(this.rowEls[seg.row]);
			highlightNodes.push(el[0]);
		}

		this.highlightEls = $(highlightNodes); // array -> jQuery set
	},


	// Unrenders any visual emphasis on a date range
	destroyHighlight: function() {
		if (this.highlightEls) {
			this.highlightEls.remove();
			this.highlightEls = null;
		}
	},


	// Generates the HTML used to build a single-row "highlight skeleton", a table that frames highlight cells
	highlightSkeletonHtml: function(startCol, endCol) {
		var colCnt = this.view.colCnt;
		var cellHtml = '';

		if (startCol > 0) {
			cellHtml += '<td colspan="' + startCol + '"/>';
		}
		if (endCol > startCol) {
			cellHtml += '<td colspan="' + (endCol - startCol) + '" class="fc-highlight" />';
		}
		if (colCnt > endCol) {
			cellHtml += '<td colspan="' + (colCnt - endCol) + '"/>';
		}

		cellHtml = this.bookendCells(cellHtml, 'highlight');

		return '' +
			'<div class="fc-highlight-skeleton">' +
				'<table>' +
					'<tr>' +
						cellHtml +
					'</tr>' +
				'</table>' +
			'</div>';
	}

});