/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System;
using System.IO;
using System.Threading.Tasks;

using ASC.CRM.Resources;
using ASC.Web.CRM.Classes;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace ASC.Web.CRM.HttpHandlers
{
    public class FileHandlerMiddleware
    {
        private readonly RequestDelegate _next;

        public FileHandlerMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task Invoke(HttpContext context,
                                Global global,
                                ContactPhotoManager contactPhotoManager)
        {
            context.Request.EnableBuffering();

            var action = context.Request.Query["action"];

            switch (action)
            {
                case "contactphotoulr":
                {
                    var contactId = Convert.ToInt32(context.Request.Query["cid"]);
                    var isCompany = Convert.ToBoolean(context.Request.Query["isc"]);
                    var photoSize = Convert.ToInt32(context.Request.Query["ps"]);

                    string photoUrl;

                    switch (photoSize)
                    {
                        case 1:
                            photoUrl = contactPhotoManager.GetSmallSizePhoto(contactId, isCompany);
                            break;
                        case 2:
                            photoUrl = contactPhotoManager.GetMediumSizePhoto(contactId, isCompany);
                            break;
                        case 3:
                            photoUrl = contactPhotoManager.GetBigSizePhoto(contactId, isCompany);
                            break;
                        default:
                            throw new Exception(CRMErrorsResource.ContactPhotoSizeUnknown);
                    }

                    context.Response.Clear();

                    await context.Response.WriteAsync(photoUrl);
                }
                break;
                case "mailmessage":
                {
                    var messageId = Convert.ToInt32(context.Request.Query["message_id"]);

                    var filePath = String.Format("folder_{0}/message_{1}.html", (messageId / 1000 + 1) * 1000, messageId);

                    string messageContent = string.Empty;

                    using (var streamReader = new StreamReader(global.GetStore().GetReadStream("mail_messages", filePath)))
                    {
                        messageContent = streamReader.ReadToEnd();
                    }

                    context.Response.Clear();

                    await context.Response.WriteAsync(messageContent);
                }
                break;
                default:
                    throw new ArgumentException(String.Format("action='{0}' is not defined", action));
            }
        }
    }

    public static class FileHandlerMiddlewareExtensions
    {
        public static IApplicationBuilder UseFileHandler(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<FileHandlerMiddleware>();
        }
    }
}