#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2016 ShareX Team

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

using ShareX.HelpersLib;
using System;
using System.Collections.Generic;
using System.Linq;

namespace ShareX.UploadersLib.URLShorteners
{
    public class CustomURLShortenerService : URLShortenerService
    {
        public override UrlShortenerType EnumValue { get; } = UrlShortenerType.CustomURLShortener;

        public override bool CheckConfig(UploadersConfig uploadersConfig)
        {
            return uploadersConfig.CustomUploadersList != null && uploadersConfig.CustomUploadersList.IsValidIndex(uploadersConfig.CustomURLShortenerSelected);
        }

        public override URLShortener CreateShortener(UploadersConfig uploadersConfig)
        {
            int index;

            if (uploadersConfig.TaskInfo.OverrideCustomUploader)
            {
                index = uploadersConfig.TaskInfo.CustomUploaderIndex.BetweenOrDefault(0, uploadersConfig.CustomUploadersList.Count - 1);
            }
            else
            {
                index = uploadersConfig.CustomURLShortenerSelected;
            }

            CustomUploaderItem customUploader = uploadersConfig.CustomUploadersList.ReturnIfValidIndex(index);

            if (customUploader != null)
            {
                return new CustomURLShortener(customUploader);
            }

            return null;
        }
    }

    public sealed class CustomURLShortener : URLShortener
    {
        private CustomUploaderItem customUploader;

        public CustomURLShortener(CustomUploaderItem customUploaderItem)
        {
            customUploader = customUploaderItem;
        }

        public override UploadResult ShortenURL(string url)
        {
            if (customUploader.RequestType == CustomUploaderRequestType.POST && !string.IsNullOrEmpty(customUploader.FileFormName))
                throw new Exception("'File form name' cannot be used with custom URL shortener.");

            if (customUploader.Arguments == null || !customUploader.Arguments.Any(x => x.Value.Contains("$input$") || x.Value.Contains("%input")))
                throw new Exception("Atleast one '$input$' required for argument value.");

            UploadResult result = new UploadResult { URL = url };

            Dictionary<string, string> args = customUploader.GetArguments(url);

            result.Response = SendRequest(customUploader.GetHttpMethod(), customUploader.GetRequestURL(), args, customUploader.GetHeaders(), responseType: customUploader.ResponseType);

            try
            {
                customUploader.ParseResponse(result, true);
            }
            catch (Exception e)
            {
                // TODO: Translate
                Errors.Add("Response parse failed." + Environment.NewLine + e);
            }

            return result;
        }
    }
}