/* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
----------------------------------------------------------------------------------------------------------------------*/
// It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
// It is responsible for managing width/height.

var BasicView = FC.BasicView = View.extend({

	scroller: null,

	dayGridClass: DayGrid, // class the dayGrid will be instantiated from (overridable by subclasses)
	dayGrid: null, // the main subcomponent that does most of the heavy lifting

	dayNumbersVisible: false, // display day numbers on each day cell?
	colWeekNumbersVisible: false, // display week numbers along the side?
	cellWeekNumbersVisible: false, // display week numbers in day cell?

	weekNumberWidth: null, // width of all the week-number cells running down the side

	headContainerEl: null, // div that hold's the dayGrid's rendered date header
	headRowEl: null, // the fake row element of the day-of-week header


	initialize: function() {
		this.dayGrid = this.instantiateDayGrid();

		this.scroller = new Scroller({
			overflowX: 'hidden',
			overflowY: 'auto'
		});
	},


	// Generates the DayGrid object this view needs. Draws from this.dayGridClass
	instantiateDayGrid: function() {
		// generate a subclass on the fly with BasicView-specific behavior
		// TODO: cache this subclass
		var subclass = this.dayGridClass.extend(basicDayGridMethods);

		return new subclass(this);
	},


	// Computes the date range that will be rendered.
	computeRenderRange: function(currentRange) {
		var renderRange = View.prototype.computeRenderRange.call(this, currentRange);

		// year and month views should be aligned with weeks. this is already done for week
		if (/^(year|month)$/.test(this.intervalUnit)) {
			renderRange.start.startOf('week');

			// make end-of-week if not already
			if (renderRange.end.weekday()) {
				renderRange.end.add(1, 'week').startOf('week'); // exclusively move backwards
			}
		}

		return renderRange;
	},


	// Renders the view into `this.el`, which should already be assigned
	renderDates: function() {

		this.dayGrid.breakOnWeeks = /year|month|week/.test(this.intervalUnit); // do before Grid::setRange
		this.dayGrid.setRange(this.renderRange);

		this.dayNumbersVisible = this.dayGrid.rowCnt > 1; // TODO: make grid responsible
		if (this.opt('weekNumbers')) {
			if (this.opt('weekNumbersWithinDays')) {
				this.cellWeekNumbersVisible = true;
				this.colWeekNumbersVisible = false;
			}
			else {
				this.cellWeekNumbersVisible = false;
				this.colWeekNumbersVisible = true;
			};
		}
		this.dayGrid.numbersVisible = this.dayNumbersVisible ||
			this.cellWeekNumbersVisible || this.colWeekNumbersVisible;

		this.el.addClass('fc-basic-view').html(this.renderSkeletonHtml());
		this.renderHead();

		this.scroller.render();
		var dayGridContainerEl = this.scroller.el.addClass('fc-day-grid-container');
		var dayGridEl = $('<div class="fc-day-grid" />').appendTo(dayGridContainerEl);
		this.el.find('.fc-body > tr > td').append(dayGridContainerEl);

		this.dayGrid.setElement(dayGridEl);
		this.dayGrid.renderDates(this.hasRigidRows());
	},


	// render the day-of-week headers
	renderHead: function() {
		this.headContainerEl =
			this.el.find('.fc-head-container')
				.html(this.dayGrid.renderHeadHtml());
		this.headRowEl = this.headContainerEl.find('.fc-row');
	},


	// Unrenders the content of the view. Since we haven't separated skeleton rendering from date rendering,
	// always completely kill the dayGrid's rendering.
	unrenderDates: function() {
		this.dayGrid.unrenderDates();
		this.dayGrid.removeElement();
		this.scroller.destroy();
	},


	renderBusinessHours: function() {
		this.dayGrid.renderBusinessHours();
	},


	unrenderBusinessHours: function() {
		this.dayGrid.unrenderBusinessHours();
	},


	// Builds the HTML skeleton for the view.
	// The day-grid component will render inside of a container defined by this HTML.
	renderSkeletonHtml: function() {
		return '' +
			'<table>' +
				'<thead class="fc-head">' +
					'<tr>' +
						'<td class="fc-head-container ' + this.widgetHeaderClass + '"></td>' +
					'</tr>' +
				'</thead>' +
				'<tbody class="fc-body">' +
					'<tr>' +
						'<td class="' + this.widgetContentClass + '"></td>' +
					'</tr>' +
				'</tbody>' +
			'</table>';
	},


	// Generates an HTML attribute string for setting the width of the week number column, if it is known
	weekNumberStyleAttr: function() {
		if (this.weekNumberWidth !== null) {
			return 'style="width:' + this.weekNumberWidth + 'px"';
		}
		return '';
	},


	// Determines whether each row should have a constant height
	hasRigidRows: function() {
		var eventLimit = this.opt('eventLimit');
		return eventLimit && typeof eventLimit !== 'number';
	},


	/* Dimensions
	------------------------------------------------------------------------------------------------------------------*/


	// Refreshes the horizontal dimensions of the view
	updateWidth: function() {
		if (this.colWeekNumbersVisible) {
			// Make sure all week number cells running down the side have the same width.
			// Record the width for cells created later.
			this.weekNumberWidth = matchCellWidths(
				this.el.find('.fc-week-number')
			);
		}
	},


	// Adjusts the vertical dimensions of the view to the specified values
	setHeight: function(totalHeight, isAuto) {
		var eventLimit = this.opt('eventLimit');
		var scrollerHeight;
		var scrollbarWidths;

		// reset all heights to be natural
		this.scroller.clear();
		uncompensateScroll(this.headRowEl);

		this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed

		// is the event limit a constant level number?
		if (eventLimit && typeof eventLimit === 'number') {
			this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
		}

		// distribute the height to the rows
		// (totalHeight is a "recommended" value if isAuto)
		scrollerHeight = this.computeScrollerHeight(totalHeight);
		this.setGridHeight(scrollerHeight, isAuto);

		// is the event limit dynamically calculated?
		if (eventLimit && typeof eventLimit !== 'number') {
			this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
		}

		if (!isAuto) { // should we force dimensions of the scroll container?

			this.scroller.setHeight(scrollerHeight);
			scrollbarWidths = this.scroller.getScrollbarWidths();

			if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?

				compensateScroll(this.headRowEl, scrollbarWidths);

				// doing the scrollbar compensation might have created text overflow which created more height. redo
				scrollerHeight = this.computeScrollerHeight(totalHeight);
				this.scroller.setHeight(scrollerHeight);
			}

			// guarantees the same scrollbar widths
			this.scroller.lockOverflow(scrollbarWidths);
		}
	},


	// given a desired total height of the view, returns what the height of the scroller should be
	computeScrollerHeight: function(totalHeight) {
		return totalHeight -
			subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
	},


	// Sets the height of just the DayGrid component in this view
	setGridHeight: function(height, isAuto) {
		if (isAuto) {
			undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
		}
		else {
			distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
		}
	},


	/* Scroll
	------------------------------------------------------------------------------------------------------------------*/


	computeInitialScroll: function() {
		return { top: 0 };
	},


	queryScroll: function() {
		return { top: this.scroller.getScrollTop() };
	},


	setScroll: function(scroll) {
		this.scroller.setScrollTop(scroll.top);
	},


	/* Hit Areas
	------------------------------------------------------------------------------------------------------------------*/
	// forward all hit-related method calls to dayGrid


	hitsNeeded: function() {
		this.dayGrid.hitsNeeded();
	},


	hitsNotNeeded: function() {
		this.dayGrid.hitsNotNeeded();
	},


	prepareHits: function() {
		this.dayGrid.prepareHits();
	},


	releaseHits: function() {
		this.dayGrid.releaseHits();
	},


	queryHit: function(left, top) {
		return this.dayGrid.queryHit(left, top);
	},


	getHitSpan: function(hit) {
		return this.dayGrid.getHitSpan(hit);
	},


	getHitEl: function(hit) {
		return this.dayGrid.getHitEl(hit);
	},


	/* Events
	------------------------------------------------------------------------------------------------------------------*/


	// Renders the given events onto the view and populates the segments array
	renderEvents: function(events) {
		this.dayGrid.renderEvents(events);

		this.updateHeight(); // must compensate for events that overflow the row
	},


	// Retrieves all segment objects that are rendered in the view
	getEventSegs: function() {
		return this.dayGrid.getEventSegs();
	},


	// Unrenders all event elements and clears internal segment data
	unrenderEvents: function() {
		this.dayGrid.unrenderEvents();

		// we DON'T need to call updateHeight() because
		// a renderEvents() call always happens after this, which will eventually call updateHeight()
	},


	/* Dragging (for both events and external elements)
	------------------------------------------------------------------------------------------------------------------*/


	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(dropLocation, seg) {
		return this.dayGrid.renderDrag(dropLocation, seg);
	},


	unrenderDrag: function() {
		this.dayGrid.unrenderDrag();
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a selection
	renderSelection: function(span) {
		this.dayGrid.renderSelection(span);
	},


	// Unrenders a visual indications of a selection
	unrenderSelection: function() {
		this.dayGrid.unrenderSelection();
	}

});


// Methods that will customize the rendering behavior of the BasicView's dayGrid
var basicDayGridMethods = {


	// Generates the HTML that will go before the day-of week header cells
	renderHeadIntroHtml: function() {
		var view = this.view;

		if (view.colWeekNumbersVisible) {
			return '' +
				'<th class="fc-week-number ' + view.widgetHeaderClass + '" ' + view.weekNumberStyleAttr() + '>' +
					'<span>' + // needed for matchCellWidths
						htmlEscape(view.opt('weekNumberTitle')) +
					'</span>' +
				'</th>';
		}

		return '';
	},


	// Generates the HTML that will go before content-skeleton cells that display the day/week numbers
	renderNumberIntroHtml: function(row) {
		var view = this.view;
		var weekStart = this.getCellDate(row, 0);

		if (view.colWeekNumbersVisible) {
			return '' +
				'<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '>' +
					view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
						{ date: weekStart, type: 'week', forceOff: this.colCnt === 1 },
						weekStart.format('w') // inner HTML
					) +
				'</td>';
		}

		return '';
	},


	// Generates the HTML that goes before the day bg cells for each day-row
	renderBgIntroHtml: function() {
		var view = this.view;

		if (view.colWeekNumbersVisible) {
			return '<td class="fc-week-number ' + view.widgetContentClass + '" ' +
				view.weekNumberStyleAttr() + '></td>';
		}

		return '';
	},


	// Generates the HTML that goes before every other type of row generated by DayGrid.
	// Affects helper-skeleton and highlight-skeleton rows.
	renderIntroHtml: function() {
		var view = this.view;

		if (view.colWeekNumbersVisible) {
			return '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '></td>';
		}

		return '';
	}

};