/* 
 * Copyright (c) 2008 Intel Corporation
 * 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 the Intel Corporation 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 INTEL 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.
 */

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using ExtensionLoader;
using HttpServer;
using OpenMetaverse;
using OpenMetaverse.StructuredData;

namespace GridServer.Extensions
{
    public class RegionFrontend : IExtension<GridServer>
    {
        GridServer server;

        public RegionFrontend()
        {
        }

        public void Start(GridServer server)
        {
            this.server = server;

            server.HttpServer.AddHandler("PUT", null, @"^/region/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", RegionAddHandler);
            server.HttpServer.AddHandler("GET", null, @"^/region/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", RegionInfoHandler);
            server.HttpServer.AddHandler("DELETE", null, @"^/region/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", RegionDeleteHandler);
            server.HttpServer.AddHandler("POST", null, @"^/region/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", RegionUpdateHandler);
            server.HttpServer.AddHandler("HEAD", null, @"^/region/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", RegionHeartbeatHandler);
        }

        public void Stop()
        {
        }

        bool RegionAddHandler(IHttpClientContext client, IHttpRequest request, IHttpResponse response)
        {
            return true;
        }

        bool RegionInfoHandler(IHttpClientContext client, IHttpRequest request, IHttpResponse response)
        {
            string path = request.Uri.PathAndQuery;
            UUID regionID;

            if (UUID.TryParse(path.Substring(path.Length - 36), out regionID))
            {
                UUID authToken = Utils.GetAuthToken(request);

                if (server.AuthorizationProvider.IsRegionAuthorized(authToken, regionID))
                {
                    Region region;
                    BackendResponse backendResponse = server.GridProvider.TryFetchRegion(regionID, out region);

                    if (backendResponse == BackendResponse.Success)
                    {

                        //response.ContentLength = data.Length;
                        //response.Body.Write(data, 0, data.Length);
                    }
                    else if (backendResponse == BackendResponse.NotFound)
                    {
                        response.Status = HttpStatusCode.NotFound;
                    }
                    else
                    {
                        response.Status = HttpStatusCode.InternalServerError;
                    }
                }
                else
                {
                    response.Status = HttpStatusCode.Forbidden;
                }
            }
            else
            {
                response.Status = HttpStatusCode.NotFound;
            }

            return true;
        }

        bool RegionDeleteHandler(IHttpClientContext client, IHttpRequest request, IHttpResponse response)
        {
            string path = request.Uri.PathAndQuery;
            UUID regionID;

            if (UUID.TryParse(path.Substring(path.Length - 36), out regionID))
            {
                UUID authToken = Utils.GetAuthToken(request);

                if (server.AuthorizationProvider.IsRegionDeleteAuthorized(authToken, regionID))
                {
                    BackendResponse backendResponse = server.GridProvider.TryDeleteRegion(regionID);

                    if (backendResponse == BackendResponse.Success)
                        response.Status = HttpStatusCode.NoContent;
                    else if (backendResponse == BackendResponse.NotFound)
                        response.Status = HttpStatusCode.NotFound;
                    else
                        response.Status = HttpStatusCode.InternalServerError;
                }
                else
                {
                    response.Status = HttpStatusCode.Forbidden;
                }
            }
            else
            {
                response.Status = HttpStatusCode.NotFound;
            }

            return true;
        }

        bool RegionUpdateHandler(IHttpClientContext client, IHttpRequest request, IHttpResponse response)
        {
            return true;
        }

        bool RegionHeartbeatHandler(IHttpClientContext client, IHttpRequest request, IHttpResponse response)
        {
            return true;
        }
    }
}