/* Top toolbar area with buttons and title
----------------------------------------------------------------------------------------------------------------------*/
// TODO: rename all header-related things to "toolbar"

function Header(calendar, options) {
	var t = this;
	
	// exports
	t.render = render;
	t.destroy = destroy;
	t.updateTitle = updateTitle;
	t.activateButton = activateButton;
	t.deactivateButton = deactivateButton;
	t.disableButton = disableButton;
	t.enableButton = enableButton;
	t.getViewsWithButtons = getViewsWithButtons;
	
	// locals
	var el = $();
	var viewsWithButtons = [];
	var tm;


	function render() {
		var sections = options.header;

		tm = options.theme ? 'ui' : 'fc';

		if (sections) {
			el = $("<div class='fc-toolbar'/>")
				.append(renderSection('left'))
				.append(renderSection('right'))
				.append(renderSection('center'))
				.append('<div class="fc-clear"/>');

			return el;
		}
	}
	
	
	function destroy() {
		el.remove();
	}
	
	
	function renderSection(position) {
		var sectionEl = $('<div class="fc-' + position + '"/>');
		var buttonStr = options.header[position];

		if (buttonStr) {
			$.each(buttonStr.split(' '), function(i) {
				var groupChildren = $();
				var isOnlyButtons = true;
				var groupEl;

				$.each(this.split(','), function(j, buttonName) {
					var viewSpec;
					var buttonClick;
					var overrideText; // text explicitly set by calendar's constructor options. overcomes icons
					var defaultText;
					var themeIcon;
					var normalIcon;
					var innerHtml;
					var classes;
					var button;

					if (buttonName == 'title') {
						groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
						isOnlyButtons = false;
					}
					else {
						viewSpec = calendar.getViewSpec(buttonName);

						if (viewSpec) {
							buttonClick = function() {
								calendar.changeView(buttonName);
							};
							viewsWithButtons.push(buttonName);
							overrideText = viewSpec.buttonTextOverride;
							defaultText = viewSpec.buttonTextDefault;
						}
						else if (calendar[buttonName]) { // a calendar method
							buttonClick = function() {
								calendar[buttonName]();
							};
							overrideText = (calendar.overrides.buttonText || {})[buttonName];
							defaultText = options.buttonText[buttonName]; // everything else is considered default
						}

						if (buttonClick) {

							themeIcon = options.themeButtonIcons[buttonName];
							normalIcon = options.buttonIcons[buttonName];

							if (overrideText) {
								innerHtml = htmlEscape(overrideText);
							}
							else if (themeIcon && options.theme) {
								innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
							}
							else if (normalIcon && !options.theme) {
								innerHtml = "<span class='fc-icon fc-icon-" + normalIcon + "'></span>";
							}
							else {
								innerHtml = htmlEscape(defaultText);
							}

							classes = [
								'fc-' + buttonName + '-button',
								tm + '-button',
								tm + '-state-default'
							];

							button = $( // type="button" so that it doesn't submit a form
								'<button type="button" class="' + classes.join(' ') + '">' +
									innerHtml +
								'</button>'
								)
								.click(function() {
									// don't process clicks for disabled buttons
									if (!button.hasClass(tm + '-state-disabled')) {

										buttonClick();

										// after the click action, if the button becomes the "active" tab, or disabled,
										// it should never have a hover class, so remove it now.
										if (
											button.hasClass(tm + '-state-active') ||
											button.hasClass(tm + '-state-disabled')
										) {
											button.removeClass(tm + '-state-hover');
										}
									}
								})
								.mousedown(function() {
									// the *down* effect (mouse pressed in).
									// only on buttons that are not the "active" tab, or disabled
									button
										.not('.' + tm + '-state-active')
										.not('.' + tm + '-state-disabled')
										.addClass(tm + '-state-down');
								})
								.mouseup(function() {
									// undo the *down* effect
									button.removeClass(tm + '-state-down');
								})
								.hover(
									function() {
										// the *hover* effect.
										// only on buttons that are not the "active" tab, or disabled
										button
											.not('.' + tm + '-state-active')
											.not('.' + tm + '-state-disabled')
											.addClass(tm + '-state-hover');
									},
									function() {
										// undo the *hover* effect
										button
											.removeClass(tm + '-state-hover')
											.removeClass(tm + '-state-down'); // if mouseleave happens before mouseup
									}
								);

							groupChildren = groupChildren.add(button);
						}
					}
				});

				if (isOnlyButtons) {
					groupChildren
						.first().addClass(tm + '-corner-left').end()
						.last().addClass(tm + '-corner-right').end();
				}

				if (groupChildren.length > 1) {
					groupEl = $('<div/>');
					if (isOnlyButtons) {
						groupEl.addClass('fc-button-group');
					}
					groupEl.append(groupChildren);
					sectionEl.append(groupEl);
				}
				else {
					sectionEl.append(groupChildren); // 1 or 0 children
				}
			});
		}

		return sectionEl;
	}
	
	
	function updateTitle(text) {
		el.find('h2').text(text);
	}
	
	
	function activateButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.addClass(tm + '-state-active');
	}
	
	
	function deactivateButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.removeClass(tm + '-state-active');
	}
	
	
	function disableButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.attr('disabled', 'disabled')
			.addClass(tm + '-state-disabled');
	}
	
	
	function enableButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.removeAttr('disabled')
			.removeClass(tm + '-state-disabled');
	}


	function getViewsWithButtons() {
		return viewsWithButtons;
	}

}