/*
 * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
 * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
 * Copyright (C) 2009 Joseph Pecoraro
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @constructor
 */
WebInspector.Toolbar = function()
{
    this.element = document.getElementById("toolbar");
    WebInspector.installDragHandle(this.element, this._toolbarDragStart.bind(this), this._toolbarDrag.bind(this), this._toolbarDragEnd.bind(this), "default");

    this._dropdownButton = document.getElementById("toolbar-dropdown-arrow");
    this._dropdownButton.addEventListener("click", this._toggleDropdown.bind(this), false);

    this._panelsMenuButton = document.getElementById("toolbar-panels-menu");
    if (this._isToolbarCustomizable()) {
        this._panelsMenuButton.addEventListener("mousedown", this._togglePanelsMenu.bind(this), false);
        this._panelsMenuButton.removeStyleClass("hidden");
    }

    document.getElementById("close-button-left").addEventListener("click", this._onClose, true);
    document.getElementById("close-button-right").addEventListener("click", this._onClose, true);

    this._panelDescriptors = [];
}

WebInspector.Toolbar.prototype = {
    resize: function()
    {
        this._updateDropdownButtonAndHideDropdown();
    },

    /**
     * @param {!WebInspector.PanelDescriptor} panelDescriptor
     */
    addPanel: function(panelDescriptor)
    {
        this._panelDescriptors.push(panelDescriptor);
        panelDescriptor._toolbarElement = this._createPanelToolbarItem(panelDescriptor);
        if (!this._isToolbarCustomizable() || this._isPanelVisible(panelDescriptor.name()))
            this.element.insertBefore(panelDescriptor._toolbarElement, this._panelInsertLocation(panelDescriptor));
        this._updatePanelsMenuState();
        this.resize();
    },

    /**
     * @param {!WebInspector.PanelDescriptor} panelDescriptor
     * @return {Element}
     */
    _panelInsertLocation: function(panelDescriptor)
    {
        if (!this._isToolbarCustomizable())
            return null;

        if (this._isDefaultPanel(panelDescriptor.name()))
            return this._firstNonDefaultPanel || null;

        if (!this._firstNonDefaultPanel)
            this._firstNonDefaultPanel = panelDescriptor._toolbarElement;
        return null;
    },

    /**
     * @param {!string} name
     * @return {boolean}
     */
    _isDefaultPanel: function(name)
    {
        var defaultPanels = {
            "elements": true,
            "resources": true,
            "scripts": true,
            "console": true,
            "network": true,
            "timeline": true,
        };
        return !!defaultPanels[name];
    },

    /**
     * @param {!string} name
     * @return {boolean}
     */
    _isPanelVisibleByDefault: function(name)
    {
        var visible = {
            "elements": true,
            "console": true,
            "network": true,
            "scripts": true,
            "timeline": true,
            "profiles": true,
            "cpu-profiler": true,
            "heap-profiler": true,
            "audits": true,
            "resources": true,
        };
        return !!visible[name];
    },

    /**
     * @return {boolean}
     */
    _isToolbarCustomizable: function()
    {
        return WebInspector.experimentsSettings.customizableToolbar.isEnabled();
    },

    /**
     * @param {!string} name
     * @return {boolean}
     */
    _isPanelVisible: function(name)
    {
        if (!this._isToolbarCustomizable())
            return true;
        var visiblePanels = WebInspector.settings.visiblePanels.get();
        return visiblePanels.hasOwnProperty(name) ? visiblePanels[name] : this._isPanelVisibleByDefault(name);
    },

    /**
     * @param {!string} name
     * @param {boolean} visible
     */
    _setPanelVisible: function(name, visible)
    {
        var visiblePanels = WebInspector.settings.visiblePanels.get();
        visiblePanels[name] = visible;
        WebInspector.settings.visiblePanels.set(visiblePanels);
    },

    /**
     * @param {!WebInspector.PanelDescriptor} panelDescriptor
     */
    _hidePanel: function(panelDescriptor)
    {
        if (!this._isPanelVisible(panelDescriptor.name()))
            return;
        var switchToSibling = panelDescriptor._toolbarElement.nextSibling;
        if (!switchToSibling || !switchToSibling.classList.contains("toggleable"))
            switchToSibling = panelDescriptor._toolbarElement.previousSibling;
        if (!switchToSibling || !switchToSibling.classList || !switchToSibling.classList.contains("toggleable"))
            return;
        this._setPanelVisible(panelDescriptor.name(), false);
        this.element.removeChild(panelDescriptor._toolbarElement);
        if (WebInspector.inspectorView.currentPanel().name === panelDescriptor.name()) {
            for (var i = 0; i < this._panelDescriptors.length; ++i) {
                var descr = this._panelDescriptors[i];
                if (descr._toolbarElement === switchToSibling) {
                    WebInspector.showPanel(descr.name());
                    break;
                }
            }
        }
        this._updatePanelsMenuState();
        this.resize();
    },

    _updatePanelsMenuState: function()
    {
        if (this._panelDescriptors.every(function (descr) { return this._isPanelVisible(descr.name()); }, this) && this._allItemsFitOntoToolbar())
            document.getElementById("toolbar-panels-menu").addStyleClass("disabled");
        else
            document.getElementById("toolbar-panels-menu").removeStyleClass("disabled");
    },

    /**
     * @return {boolean}
     */
    _allItemsFitOntoToolbar: function()
    {
        var toolbarItems = this.element.querySelectorAll(".toolbar-item.toggleable");
        return toolbarItems.length === 0 || this.element.scrollHeight < toolbarItems[0].offsetHeight * 2;
    },

    /**
     * @param {!WebInspector.PanelDescriptor} panelDescriptor
     */
    _showPanel: function(panelDescriptor)
    {
        if (this._isPanelVisible(panelDescriptor.name()))
            return;
        this.element.appendChild(panelDescriptor._toolbarElement);
        panelDescriptor._toolbarElement.removeStyleClass("hidden");
        this._setPanelVisible(panelDescriptor.name(), true);
        this._updatePanelsMenuState();
        this.resize();
    },

    /**
     * @param {WebInspector.PanelDescriptor} panelDescriptor
     * @param {boolean=} noCloseButton
     * @return {Element}
     */
    _createPanelToolbarItem: function(panelDescriptor, noCloseButton)
    {
        var toolbarItem = document.createElement("button");
        toolbarItem.className = "toolbar-item toggleable";
        toolbarItem.panelDescriptor = panelDescriptor;
        toolbarItem.addStyleClass(panelDescriptor.name());

        /**
         * @param {Event} event
         */
        function onContextMenuEvent(event)
        {
            var contextMenu = new WebInspector.ContextMenu(event);
            contextMenu.appendItem(WebInspector.UIString("Close"), this._hidePanel.bind(this, panelDescriptor));
            contextMenu.show();
        }
        if (!this._isDefaultPanel(panelDescriptor.name()))
            toolbarItem.addEventListener("contextmenu", onContextMenuEvent.bind(this), true);

        function onToolbarItemClicked()
        {
            this._showPanel(panelDescriptor);
            this._updateDropdownButtonAndHideDropdown();
            WebInspector.inspectorView.setCurrentPanel(panelDescriptor.panel());
        }
        toolbarItem.addEventListener("click", onToolbarItemClicked.bind(this), false);

        function onToolbarItemCloseButtonClicked(event)
        {
            event.stopPropagation();
            this._hidePanel(panelDescriptor);
        }

        function panelSelected()
        {
            if (WebInspector.inspectorView.currentPanel() && panelDescriptor.name() === WebInspector.inspectorView.currentPanel().name)
                toolbarItem.addStyleClass("toggled-on");
            else
                toolbarItem.removeStyleClass("toggled-on");
        }
        WebInspector.inspectorView.addEventListener(WebInspector.InspectorView.Events.PanelSelected, panelSelected);

        toolbarItem.createChild("div", "toolbar-label").textContent = panelDescriptor.title();
        if (this._isToolbarCustomizable() && !this._isDefaultPanel(panelDescriptor.name()) && !noCloseButton) {
            var closeButton = toolbarItem.createChild("div", "close-button");
            closeButton.addEventListener("click", onToolbarItemCloseButtonClicked.bind(this), false);
        }
        panelSelected();
        return toolbarItem;
    },

    /**
     * @return {boolean}
     */
    _isDockedToBottom: function()
    {
        return !!WebInspector.dockController && WebInspector.dockController.dockSide() == WebInspector.DockController.State.DockedToBottom;
    },

    /**
     * @return {boolean}
     */
    _isUndocked: function()
    {
        return !!WebInspector.dockController && WebInspector.dockController.dockSide() == WebInspector.DockController.State.Undocked;
    },

    /**
     * @return {boolean}
     */
    _toolbarDragStart: function(event)
    {
        if (this._isUndocked())
            return false;

        var target = event.target;
        if (target.hasStyleClass("toolbar-item") && target.hasStyleClass("toggleable"))
            return false;

        if (target !== this.element && !target.hasStyleClass("toolbar-item"))
            return false;

        this._lastScreenX = event.screenX;
        this._lastScreenY = event.screenY;
        this._lastHeightDuringDrag = window.innerHeight;
        this._startDistanceToRight = window.innerWidth - event.clientX;
        this._startDinstanceToBottom = window.innerHeight - event.clientY;
        return true;
    },

    _toolbarDragEnd: function(event)
    {
        // We may not get the drag event at the end.
        // Apply last changes manually.
        this._toolbarDrag(event);
        delete this._lastScreenX;
        delete this._lastScreenY;
        delete this._lastHeightDuringDrag;
        delete this._startDistanceToRight;
        delete this._startDinstanceToBottom;
    },

    _toolbarDrag: function(event)
    {
        event.preventDefault();

        if (this._isUndocked())
            return this._toolbarDragMoveWindow(event);

        return this._toolbarDragChangeDocking(event);
    },

    _toolbarDragMoveWindow: function(event)
    {
        var x = event.screenX - this._lastScreenX;
        var y = event.screenY - this._lastScreenY;
        this._lastScreenX = event.screenX;
        this._lastScreenY = event.screenY;
        InspectorFrontendHost.moveWindowBy(x, y);
    },

    _toolbarDragChangeDocking: function(event)
    {
        if (this._isDockedToBottom()) {
            var distanceToRight = window.innerWidth - event.clientX;
            if (distanceToRight < this._startDistanceToRight * 2 / 3) {
                InspectorFrontendHost.requestSetDockSide(WebInspector.DockController.State.DockedToRight);
                return true;
            }
        } else {
            var distanceToBottom = window.innerHeight - event.clientY;
            if (distanceToBottom < this._startDinstanceToBottom * 2 / 3) {
                InspectorFrontendHost.requestSetDockSide(WebInspector.DockController.State.DockedToBottom);
                return true;
            }
        }
    },

    _onClose: function()
    {
        WebInspector.close();
    },

    _setDropdownVisible: function(visible)
    {
        if (!this._dropdown) {
            if (!visible)
                return;
            this._dropdown = new WebInspector.ToolbarDropdown(this);
        }
        if (visible)
            this._dropdown.show();
        else
            this._dropdown.hide();
    },

    _toggleDropdown: function()
    {
        this._setDropdownVisible(!this._dropdown || !this._dropdown.visible);
    },

    _togglePanelsMenu: function(event)
    {
        function activatePanel(panelDescriptor)
        {
            this._showPanel(panelDescriptor);
            WebInspector.showPanel(panelDescriptor.name());
        }

        var contextMenu = new WebInspector.ContextMenu(event);
        var currentPanelName = WebInspector.inspectorView.currentPanel().name;
        var toolbarItems = this.element.querySelectorAll(".toolbar-item.toggleable");
        for (var i = 0; i < toolbarItems.length; ++i) {
            if (toolbarItems[i].offsetTop >= toolbarItems[0].offsetHeight) {
                var descr = toolbarItems[i].panelDescriptor;
                if (descr.name() === currentPanelName)
                    contextMenu.appendCheckboxItem(descr.title(), activatePanel.bind(this, descr), true);
                else
                    contextMenu.appendItem(descr.title(), activatePanel.bind(this, descr));
            }
        }
        contextMenu.appendSeparator();
        for (var i = 0; i < this._panelDescriptors.length; ++i) {
            var descr = this._panelDescriptors[i];
            if (this._isPanelVisible(descr.name()))
                continue;
            contextMenu.appendItem(descr.title(), activatePanel.bind(this, descr));
        }

        contextMenu.showSoftMenu();
    },

    _updateDropdownButtonAndHideDropdown: function()
    {
        WebInspector.invokeOnceAfterBatchUpdate(this, this._innerUpdateDropdownButtonAndHideDropdown);
    },

    _innerUpdateDropdownButtonAndHideDropdown: function()
    {
        if (this._isToolbarCustomizable()) {
            this._updatePanelsMenuState();
            return;
        }
        this._setDropdownVisible(false);

        if (this.element.scrollHeight > this.element.offsetHeight)
            this._dropdownButton.removeStyleClass("hidden");
        else
            this._dropdownButton.addStyleClass("hidden");
    }
}

/**
 * @constructor
 * @param {WebInspector.Toolbar} toolbar
 */
WebInspector.ToolbarDropdown = function(toolbar)
{
    this._toolbar = toolbar;
    this._arrow = document.getElementById("toolbar-dropdown-arrow");
    this.element = document.createElement("div");
    this.element.id = "toolbar-dropdown";
    this.element.className = "toolbar-small";
    this._contentElement = this.element.createChild("div", "scrollable-content");
    this._contentElement.tabIndex = 0;
    this._contentElement.addEventListener("keydown", this._onKeyDown.bind(this), true);
}

WebInspector.ToolbarDropdown.prototype = {
    show: function()
    {
        if (this.visible)
            return;
        var style = this.element.style;
        this._populate();
        var top = this._arrow.totalOffsetTop() + this._arrow.clientHeight;
        this._arrow.addStyleClass("dropdown-visible");
        this.element.style.top = top + "px";
        this.element.style.right = window.innerWidth - this._arrow.totalOffsetLeft() - this._arrow.clientWidth + "px";
        this._contentElement.style.maxHeight = window.innerHeight - top - 20 + "px";
        this._toolbar.element.appendChild(this.element);
    },

    hide: function()
    {
        if (!this.visible)
            return;
        this._arrow.removeStyleClass("dropdown-visible");
        this.element.remove();
        this._contentElement.removeChildren();
    },

    get visible()
    {
        return !!this.element.parentNode;
    },

    _populate: function()
    {
        var toolbarItems = this._toolbar.element.querySelectorAll(".toolbar-item.toggleable");

        var needsSeparator = false;
        for (var i = 0; i < toolbarItems.length; ++i) {
            if (toolbarItems[i].offsetTop >= toolbarItems[0].offsetHeight) {
                this._contentElement.appendChild(this._toolbar._createPanelToolbarItem(toolbarItems[i].panelDescriptor, true));
                needsSeparator = true;
            }
        }

        var panelDescriptors = this._toolbar._panelDescriptors;
        for (var i = 0; i < panelDescriptors.length; ++i) {
            var descr = panelDescriptors[i];
            if (this._toolbar._isPanelVisible(descr.name()))
                continue;
            if (needsSeparator) {
                this._contentElement.createChild("div", "toolbar-items-separator");
                needsSeparator = false;
            }
            this._contentElement.appendChild(this._toolbar._createPanelToolbarItem(descr, true));
        }
    },

    _onKeyDown: function(event)
    {
        if (event.keyCode !== WebInspector.KeyboardShortcut.Keys.Esc.code)
            return;
        event.consume();
        this.hide();
    }
}

/**
 * @type {?WebInspector.Toolbar}
 */
WebInspector.toolbar = null;