/*
 * Copyright (C) 2012 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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.
 */

/**
 * @interface
 */
WebInspector.Progress = function()
{
}

WebInspector.Progress.prototype = {
    /**
     * @param {number} totalWork
     */
    setTotalWork: function(totalWork) { },

    /**
     * @param {string} title
     */
    setTitle: function(title) { },

    /**
     * @param {number} worked
     * @param {string=} title
     */
    setWorked: function(worked, title) { },

    done: function() { },

    /**
     * @return {boolean}
     */
    isCanceled: function() { return false; }
}

/**
 * @constructor
 * @implements {WebInspector.Progress}
 * @extends {WebInspector.Object}
 */
WebInspector.ProgressIndicator = function()
{
    this.element = document.createElement("div");
    this.element.className = "progress-bar-container";
    this._labelElement = this.element.createChild("span");
    this._progressElement = this.element.createChild("progress");
    this._stopButton = new WebInspector.StatusBarButton(WebInspector.UIString("Cancel"), "progress-bar-stop-button");
    this._stopButton.addEventListener("click", this._cancel, this);
    this.element.appendChild(this._stopButton.element);
    this._isCanceled = false;
}

WebInspector.ProgressIndicator.Events = {
    Done: "Done"
}

WebInspector.ProgressIndicator.prototype = {
    /**
     * @param {Element} parent
     */
    show: function(parent)
    {
        parent.appendChild(this.element);
    },

    hide: function()
    {
        var parent = this.element.parentElement;
        if (parent)
            parent.removeChild(this.element);
    },

    done: function()
    {
        this.hide();
        this.dispatchEventToListeners(WebInspector.ProgressIndicator.Events.Done);
    },

    _cancel: function()
    {
        this._isCanceled = true;
    },

    isCanceled: function()
    {
        return this._isCanceled;
    },

    /**
     * @param {string} title
     */
    setTitle: function(title)
    {
        this._labelElement.textContent = title;
    },

    /**
     * @param {number} totalWork
     */
    setTotalWork: function(totalWork)
    {
        this._progressElement.max = totalWork;
    },

    /**
     * @param {number} worked
     * @param {string=} title
     */
    setWorked: function(worked, title)
    {
        this._progressElement.value = worked;
        if (title)
            this.setTitle(title);
    }
}

WebInspector.ProgressIndicator.prototype.__proto__ = WebInspector.Object.prototype;

/**
 * @constructor
 * @param {WebInspector.Progress} parent
 */
WebInspector.CompositeProgress = function(parent)
{
    this._parent = parent;
    this._children = [];
    this._childrenDone = 0;
    this._parent.setTotalWork(1);
    this._parent.setWorked(0);
}

WebInspector.CompositeProgress.prototype = {
    _childDone: function()
    {
        if (++this._childrenDone === this._children.length)
            this._parent.done();
    },

    /**
     * @param {number=} weight
     */
    createSubProgress: function(weight)
    {
        var child = new WebInspector.SubProgress(this, weight);
        this._children.push(child);
        return child;
    },

    _update: function()
    {
        var totalWeights = 0;
        var done = 0;

        for (var i = 0; i < this._children.length; ++i) {
            var child = this._children[i];
            if (child._totalWork)
                done += child._weight * child._worked / child._totalWork;
            totalWeights += child._weight;
        }
        this._parent.setWorked(done / totalWeights);
    }
}

/**
 * @constructor
 * @implements {WebInspector.Progress}
 * @param {WebInspector.CompositeProgress} composite
 * @param {number=} weight
 */
WebInspector.SubProgress = function(composite, weight)
{
    this._composite = composite;
    this._weight = weight || 1;
    this._worked = 0;
}

WebInspector.SubProgress.prototype = {
    /**
     * @return {boolean}
     */
    isCanceled: function()
    {
        return this._composite._parent.isCanceled();
    },

    /**
     * @param {string} title
     */
    setTitle: function(title)
    {
        this._composite._parent.setTitle(title);
    },

    done: function()
    {
        this.setWorked(this._totalWork);
        this._composite._childDone();
    },

    /**
     * @param {number} totalWork
     */
    setTotalWork: function(totalWork)
    {
        this._totalWork = totalWork;
        this._composite._update();
    },

    /**
     * @param {number} worked
     * @param {string=} title
     */
    setWorked: function(worked, title)
    {
        this._worked = worked;
        if (typeof title !== "undefined")
            this.setTitle(title);
        this._composite._update();
    }
}
