// Copyright (c) 2020 Sergey Ivonchik
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.

using System.Collections.Generic;
using System.Linq;
using Httx.Requests.Awaiters.Async;
using Httx.Requests.Extensions;
using UnityEngine;
using UnityEngine.Networking;

namespace Httx.Requests.Awaiters {
  public class UnityWebRequestTextureAwaiter : BaseUnityAwaiter<Texture2D> {
    private readonly IReadOnlyCollection<KeyValuePair<string, object>> resolvedHeaders;
    private readonly bool isReadable;

    public UnityWebRequestTextureAwaiter(IRequest request) : base(request) {
      resolvedHeaders = request.ResolveHeaders()?.ToList();
      isReadable = resolvedHeaders.FetchHeader<bool>(InternalHeaders.TextureReadable);
    }

    public override IAsyncOperation Awake(IRequest request) {
      var verb = request.ResolveVerb();
      var url = request.ResolveUrl();

      var requestImpl = new UnityWebRequest(url, verb) {
          downloadHandler = new DownloadHandlerTexture(isReadable)
      };

      return SendCached(requestImpl, resolvedHeaders);
    }

    public override Texture2D Map(IRequest request, IAsyncOperation completeOperation) {
      var webRequest = completeOperation?.Result as UnityWebRequest;
      var handler = webRequest?.downloadHandler as DownloadHandlerTexture;

      return handler?.texture;
    }
  }
}