/*
 * Copyright (C) 2013 Apple 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
 */

WI.Branch = class Branch
{
    constructor(displayName, revisions, locked)
    {
        console.assert(displayName);

        this._displayName = displayName;
        this._revisions = revisions instanceof Array ? revisions.slice() : [];
        this._locked = locked || false;
    }

    // Public

    get displayName()
    {
        return this._displayName;
    }

    set displayName(displayName)
    {
        console.assert(displayName);
        if (!displayName)
            return;

        this._displayName = displayName;
    }

    get revisions()
    {
        return this._revisions;
    }

    get locked()
    {
        return this._locked;
    }

    revisionForRepresentedObject(representedObject, doNotCreateIfNeeded)
    {
        for (var i = 0; i < this._revisions.length; ++i) {
            var revision = this._revisions[i];
            if (revision instanceof WI.SourceCodeRevision && revision.sourceCode === representedObject)
                return revision;
        }

        if (doNotCreateIfNeeded)
            return null;

        if (representedObject instanceof WI.SourceCode) {
            var revision = representedObject.originalRevision.copy();
            representedObject.currentRevision = revision;
            this.addRevision(revision);
            return revision;
        }

        return null;
    }

    addRevision(revision)
    {
        console.assert(revision instanceof WI.Revision);

        if (this._locked)
            return;

        if (this._revisions.includes(revision))
            return;

        this._revisions.push(revision);
    }

    removeRevision(revision)
    {
        console.assert(revision instanceof WI.Revision);

        if (this._locked)
            return;

        this._revisions.remove(revision);
    }

    reset()
    {
        if (this._locked)
            return;

        this._revisions = [];
    }

    fork(displayName)
    {
        var copiedRevisions = this._revisions.map(function(revision) { return revision.copy(); });
        return new WI.Branch(displayName, copiedRevisions);
    }

    apply()
    {
        for (var i = 0; i < this._revisions.length; ++i)
            this._revisions[i].apply();
    }

    revert()
    {
        for (var i = this._revisions.length - 1; i >= 0; --i)
            this._revisions[i].revert();
    }

    lock()
    {
        console.assert(!this._locked);
        this._locked = true;
    }

    unlock()
    {
        console.assert(this._locked);
        this._locked = false;
    }
};