/**
 * DropMenu.js
 *
 * Copyright 2009, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://tinymce.moxiecode.com/license
 * Contributing: http://tinymce.moxiecode.com/contributing
 */

(function(tinymce) {
	var is = tinymce.is, DOM = tinymce.DOM, each = tinymce.each, Event = tinymce.dom.Event, Element = tinymce.dom.Element;

	/**
	 * This class is used to create drop menus, a drop menu can be a
	 * context menu, or a menu for a list box or a menu bar.
	 *
	 * @class tinymce.ui.DropMenu
	 * @extends tinymce.ui.Menu
	 */
	tinymce.create('tinymce.ui.DropMenu:tinymce.ui.Menu', {
		/**
		 * Constructs a new drop menu control instance.
		 *
		 * @constructor
		 * @method DropMenu
		 * @param {String} id Button control id for the button.
		 * @param {Object} s Optional name/value settings object.
		 */
		DropMenu : function(id, s) {
			s = s || {};
			s.container = s.container || DOM.doc.body;
			s.offset_x = s.offset_x || 0;
			s.offset_y = s.offset_y || 0;
			s.vp_offset_x = s.vp_offset_x || 0;
			s.vp_offset_y = s.vp_offset_y || 0;

			if (is(s.icons) && !s.icons)
				s['class'] += ' mceNoIcons';

			this.parent(id, s);
			this.onShowMenu = new tinymce.util.Dispatcher(this);
			this.onHideMenu = new tinymce.util.Dispatcher(this);
			this.classPrefix = 'mceMenu';
		},

		/**
		 * Created a new sub menu for the drop menu control.
		 *
		 * @method createMenu
		 * @param {Object} s Optional name/value settings object.
		 * @return {tinymce.ui.DropMenu} New drop menu instance.
		 */
		createMenu : function(s) {
			var t = this, cs = t.settings, m;

			s.container = s.container || cs.container;
			s.parent = t;
			s.constrain = s.constrain || cs.constrain;
			s['class'] = s['class'] || cs['class'];
			s.vp_offset_x = s.vp_offset_x || cs.vp_offset_x;
			s.vp_offset_y = s.vp_offset_y || cs.vp_offset_y;
			s.keyboard_focus = cs.keyboard_focus;
			m = new tinymce.ui.DropMenu(s.id || DOM.uniqueId(), s);

			m.onAddItem.add(t.onAddItem.dispatch, t.onAddItem);

			return m;
		},
		
		focus : function() {
			var t = this;
			if (t.keyboardNav) {
				t.keyboardNav.focus();
			}
		},

		/**
		 * Repaints the menu after new items have been added dynamically.
		 *
		 * @method update
		 */
		update : function() {
			var t = this, s = t.settings, tb = DOM.get('menu_' + t.id + '_tbl'), co = DOM.get('menu_' + t.id + '_co'), tw, th;

			tw = s.max_width ? Math.min(tb.clientWidth, s.max_width) : tb.clientWidth;
			th = s.max_height ? Math.min(tb.clientHeight, s.max_height) : tb.clientHeight;

			if (!DOM.boxModel)
				t.element.setStyles({width : tw + 2, height : th + 2});
			else
				t.element.setStyles({width : tw, height : th});

			if (s.max_width)
				DOM.setStyle(co, 'width', tw);

			if (s.max_height) {
				DOM.setStyle(co, 'height', th);

				if (tb.clientHeight < s.max_height)
					DOM.setStyle(co, 'overflow', 'hidden');
			}
		},

		/**
		 * Displays the menu at the specified cordinate.
		 *
		 * @method showMenu
		 * @param {Number} x Horizontal position of the menu.
		 * @param {Number} y Vertical position of the menu.
		 * @param {Numner} px Optional parent X position used when menus are cascading.
		 */
		showMenu : function(x, y, px) {
			var t = this, s = t.settings, co, vp = DOM.getViewPort(), w, h, mx, my, ot = 2, dm, tb, cp = t.classPrefix;

			t.collapse(1);

			if (t.isMenuVisible)
				return;

			if (!t.rendered) {
				co = DOM.add(t.settings.container, t.renderNode());

				each(t.items, function(o) {
					o.postRender();
				});

				t.element = new Element('menu_' + t.id, {blocker : 1, container : s.container});
			} else
				co = DOM.get('menu_' + t.id);

			// Move layer out of sight unless it's Opera since it scrolls to top of page due to an bug
			if (!tinymce.isOpera)
				DOM.setStyles(co, {left : -0xFFFF , top : -0xFFFF});

			DOM.show(co);
			t.update();

			x += s.offset_x || 0;
			y += s.offset_y || 0;
			vp.w -= 4;
			vp.h -= 4;

			// Move inside viewport if not submenu
			if (s.constrain) {
				w = co.clientWidth - ot;
				h = co.clientHeight - ot;
				mx = vp.x + vp.w;
				my = vp.y + vp.h;

				if ((x + s.vp_offset_x + w) > mx)
					x = px ? px - w : Math.max(0, (mx - s.vp_offset_x) - w);

				if ((y + s.vp_offset_y + h) > my)
					y = Math.max(0, (my - s.vp_offset_y) - h);
			}

			DOM.setStyles(co, {left : x , top : y});
			t.element.update();

			t.isMenuVisible = 1;
			t.mouseClickFunc = Event.add(co, 'click', function(e) {
				var m;

				e = e.target;

				if (e && (e = DOM.getParent(e, 'tr')) && !DOM.hasClass(e, cp + 'ItemSub')) {
					m = t.items[e.id];

					if (m.isDisabled())
						return;

					dm = t;

					while (dm) {
						if (dm.hideMenu)
							dm.hideMenu();

						dm = dm.settings.parent;
					}

					if (m.settings.onclick)
						m.settings.onclick(e);

					return Event.cancel(e); // Cancel to fix onbeforeunload problem
				}
			});

			if (t.hasMenus()) {
				t.mouseOverFunc = Event.add(co, 'mouseover', function(e) {
					var m, r, mi;

					e = e.target;
					if (e && (e = DOM.getParent(e, 'tr'))) {
						m = t.items[e.id];

						if (t.lastMenu)
							t.lastMenu.collapse(1);

						if (m.isDisabled())
							return;

						if (e && DOM.hasClass(e, cp + 'ItemSub')) {
							//p = DOM.getPos(s.container);
							r = DOM.getRect(e);
							m.showMenu((r.x + r.w - ot), r.y - ot, r.x);
							t.lastMenu = m;
							DOM.addClass(DOM.get(m.id).firstChild, cp + 'ItemActive');
						}
					}
				});
			}
			
			Event.add(co, 'keydown', t._keyHandler, t);

			t.onShowMenu.dispatch(t);

			if (s.keyboard_focus) { 
				t._setupKeyboardNav(); 
			}
		},

		/**
		 * Hides the displayed menu.
		 *
		 * @method hideMenu
		 */
		hideMenu : function(c) {
			var t = this, co = DOM.get('menu_' + t.id), e;

			if (!t.isMenuVisible)
				return;

			if (t.keyboardNav) t.keyboardNav.destroy();
			Event.remove(co, 'mouseover', t.mouseOverFunc);
			Event.remove(co, 'click', t.mouseClickFunc);
			Event.remove(co, 'keydown', t._keyHandler);
			DOM.hide(co);
			t.isMenuVisible = 0;

			if (!c)
				t.collapse(1);

			if (t.element)
				t.element.hide();

			if (e = DOM.get(t.id))
				DOM.removeClass(e.firstChild, t.classPrefix + 'ItemActive');

			t.onHideMenu.dispatch(t);
		},

		/**
		 * Adds a new menu, menu item or sub classes of them to the drop menu.
		 *
		 * @method add
		 * @param {tinymce.ui.Control} o Menu or menu item to add to the drop menu.
		 * @return {tinymce.ui.Control} Same as the input control, the menu or menu item.
		 */
		add : function(o) {
			var t = this, co;

			o = t.parent(o);

			if (t.isRendered && (co = DOM.get('menu_' + t.id)))
				t._add(DOM.select('tbody', co)[0], o);

			return o;
		},

		/**
		 * Collapses the menu, this will hide the menu and all menu items.
		 *
		 * @method collapse
		 * @param {Boolean} d Optional deep state. If this is set to true all children will be collapsed as well.
		 */
		collapse : function(d) {
			this.parent(d);
			this.hideMenu(1);
		},

		/**
		 * Removes a specific sub menu or menu item from the drop menu.
		 *
		 * @method remove
		 * @param {tinymce.ui.Control} o Menu item or menu to remove from drop menu.
		 * @return {tinymce.ui.Control} Control instance or null if it wasn't found.
		 */
		remove : function(o) {
			DOM.remove(o.id);
			this.destroy();

			return this.parent(o);
		},

		/**
		 * Destroys the menu. This will remove the menu from the DOM and any events added to it etc.
		 *
		 * @method destroy
		 */
		destroy : function() {
			var t = this, co = DOM.get('menu_' + t.id);

			if (t.keyboardNav) t.keyboardNav.destroy();
			Event.remove(co, 'mouseover', t.mouseOverFunc);
			Event.remove(DOM.select('a', co), 'focus', t.mouseOverFunc);
			Event.remove(co, 'click', t.mouseClickFunc);
			Event.remove(co, 'keydown', t._keyHandler);

			if (t.element)
				t.element.remove();

			DOM.remove(co);
		},

		/**
		 * Renders the specified menu node to the dom.
		 *
		 * @method renderNode
		 * @return {Element} Container element for the drop menu.
		 */
		renderNode : function() {
			var t = this, s = t.settings, n, tb, co, w;

			w = DOM.create('div', {role: 'listbox', id : 'menu_' + t.id, 'class' : s['class'], 'style' : 'position:absolute;left:0;top:0;z-index:200000;outline:0'});
			if (t.settings.parent) {
				DOM.setAttrib(w, 'aria-parent', 'menu_' + t.settings.parent.id);
			}
			co = DOM.add(w, 'div', {role: 'presentation', id : 'menu_' + t.id + '_co', 'class' : t.classPrefix + (s['class'] ? ' ' + s['class'] : '')});
			t.element = new Element('menu_' + t.id, {blocker : 1, container : s.container});

			if (s.menu_line)
				DOM.add(co, 'span', {'class' : t.classPrefix + 'Line'});

//			n = DOM.add(co, 'div', {id : 'menu_' + t.id + '_co', 'class' : 'mceMenuContainer'});
			n = DOM.add(co, 'table', {role: 'presentation', id : 'menu_' + t.id + '_tbl', border : 0, cellPadding : 0, cellSpacing : 0});
			tb = DOM.add(n, 'tbody');

			each(t.items, function(o) {
				t._add(tb, o);
			});

			t.rendered = true;

			return w;
		},

		// Internal functions
		_setupKeyboardNav : function(){
			var contextMenu, menuItems, t=this; 
			contextMenu = DOM.select('#menu_' + t.id)[0];
			menuItems = DOM.select('a[role=option]', 'menu_' + t.id);
			menuItems.splice(0,0,contextMenu);
			t.keyboardNav = new tinymce.ui.KeyboardNavigation({
				root: 'menu_' + t.id,
				items: menuItems,
				onCancel: function() {
					t.hideMenu();
				},
				enableUpDown: true
			});
			contextMenu.focus();
		},

		_keyHandler : function(evt) {
			var t = this, e;
			switch (evt.keyCode) {
				case 37: // Left
					if (t.settings.parent) {
						t.hideMenu();
						t.settings.parent.focus();
						Event.cancel(evt);
					}
					break;
				case 39: // Right
					if (t.mouseOverFunc)
						t.mouseOverFunc(evt);
					break;
			}
		},

		_add : function(tb, o) {
			var n, s = o.settings, a, ro, it, cp = this.classPrefix, ic;

			if (s.separator) {
				ro = DOM.add(tb, 'tr', {id : o.id, 'class' : cp + 'ItemSeparator'});
				DOM.add(ro, 'td', {'class' : cp + 'ItemSeparator'});

				if (n = ro.previousSibling)
					DOM.addClass(n, 'mceLast');

				return;
			}

			n = ro = DOM.add(tb, 'tr', {id : o.id, 'class' : cp + 'Item ' + cp + 'ItemEnabled'});
			n = it = DOM.add(n, s.titleItem ? 'th' : 'td');
			n = a = DOM.add(n, 'a', {id: o.id + '_aria',  role: s.titleItem ? 'presentation' : 'option', href : 'javascript:;', onclick : "return false;", onmousedown : 'return false;'});

			if (s.parent) {
				DOM.setAttrib(a, 'aria-haspopup', 'true');
				DOM.setAttrib(a, 'aria-owns', 'menu_' + o.id);
			}

			DOM.addClass(it, s['class']);
//			n = DOM.add(n, 'span', {'class' : 'item'});

			ic = DOM.add(n, 'span', {'class' : 'mceIcon' + (s.icon ? ' mce_' + s.icon : '')});

			if (s.icon_src)
				DOM.add(ic, 'img', {src : s.icon_src});

			n = DOM.add(n, s.element || 'span', {'class' : 'mceText', title : o.settings.title}, o.settings.title);

			if (o.settings.style)
				DOM.setAttrib(n, 'style', o.settings.style);

			if (tb.childNodes.length == 1)
				DOM.addClass(ro, 'mceFirst');

			if ((n = ro.previousSibling) && DOM.hasClass(n, cp + 'ItemSeparator'))
				DOM.addClass(ro, 'mceFirst');

			if (o.collapse)
				DOM.addClass(ro, cp + 'ItemSub');

			if (n = ro.previousSibling)
				DOM.removeClass(n, 'mceLast');

			DOM.addClass(ro, 'mceLast');
		}
	});
})(tinymce);