/*
 * 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.
 */

WebInspector.ResourceCollection = class ResourceCollection extends WebInspector.Object
{
    constructor()
    {
        super();

        this._resources = [];
        this._resourceURLMap = new Map;
        this._resourcesTypeMap = new Map;
    }

    // Public

    get resources()
    {
        return this._resources;
    }

    resourceForURL(url)
    {
        return this._resourceURLMap.get(url) || null;
    }

    resourcesWithType(type)
    {
        return this._resourcesTypeMap.get(type) || [];
    }

    addResource(resource)
    {
        console.assert(resource instanceof WebInspector.Resource);
        if (!(resource instanceof WebInspector.Resource))
            return;

        this._associateWithResource(resource);
    }

    removeResource(resourceOrURL)
    {
        console.assert(resourceOrURL);

        if (resourceOrURL instanceof WebInspector.Resource)
            var url = resourceOrURL.url;
        else
            var url = resourceOrURL;

        // Fetch the resource by URL even if we were passed a WebInspector.Resource.
        // We do this incase the WebInspector.Resource is a new object that isn't in _resources,
        // but the URL is a valid resource.
        var resource = this.resourceForURL(url);
        console.assert(resource instanceof WebInspector.Resource);
        if (!(resource instanceof WebInspector.Resource))
            return null;

        this._disassociateWithResource(resource);

        return resource;
    }

    removeAllResources()
    {
        if (!this._resources.length)
            return;

        for (var i = 0; i < this._resources.length; ++i)
            this._disassociateWithResource(this._resources[i], true);

        this._resources = [];
        this._resourceURLMap.clear();
        this._resourcesTypeMap.clear();
    }

    // Private

    _associateWithResource(resource)
    {
        this._resources.push(resource);
        this._resourceURLMap.set(resource.url, resource);

        if (!this._resourcesTypeMap.has(resource.type))
            this._resourcesTypeMap.set(resource.type, [resource]);
        else
            this._resourcesTypeMap.get(resource.type).push(resource);

        resource.addEventListener(WebInspector.Resource.Event.URLDidChange, this._resourceURLDidChange, this);
        resource.addEventListener(WebInspector.Resource.Event.TypeDidChange, this._resourceTypeDidChange, this);
    }

    _disassociateWithResource(resource, skipRemoval)
    {
        if (skipRemoval) {
            this._resources.remove(resource);
            if (this._resourcesTypeMap.has(resource.type))
                this._resourcesTypeMap.get(resource.type).remove(resource);
            this._resourceURLMap.delete(resource.url);
        }

        resource.removeEventListener(WebInspector.Resource.Event.URLDidChange, this._resourceURLDidChange, this);
        resource.removeEventListener(WebInspector.Resource.Event.TypeDidChange, this._resourceTypeDidChange, this);
    }

    _resourceURLDidChange(event)
    {
        var resource = event.target;
        console.assert(resource instanceof WebInspector.Resource);
        if (!(resource instanceof WebInspector.Resource))
            return;

        var oldURL = event.data.oldURL;
        console.assert(oldURL);
        if (!oldURL)
            return;

        this._resourceURLMap.set(resource.url, resource);
        this._resourceURLMap.delete(oldURL);
    }

    _resourceTypeDidChange(event)
    {
        var resource = event.target;
        console.assert(resource instanceof WebInspector.Resource);
        if (!(resource instanceof WebInspector.Resource))
            return;

        var oldType = event.data.oldType;
        console.assert(oldType);
        if (!oldType)
            return;

        if (!this._resourcesTypeMap.has(resource.type))
            this._resourcesTypeMap.set(resource.type, [resource]);
        else
            this._resourcesTypeMap.get(resource.type).push(resource);

        if (this._resourcesTypeMap.has(oldType))
            this._resourcesTypeMap.get(oldType).remove(resource);
    }
};