/*
Copyright 2013 Google Inc

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

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

using Google.Apis.Auth.OAuth2.Requests;
using Google.Apis.Auth.OAuth2.Responses;
using Google.Apis.Logging;

namespace Google.Apis.Auth.OAuth2
{
    /// <summary>OAuth 2.0 verification code receiver that reads the authorization code from the user input.</summary>
    public class PromptCodeReceiver : ICodeReceiver
    {
        private static readonly ILogger Logger = ApplicationContext.Logger.ForType<PromptCodeReceiver>();

        /// <inheritdoc/>
        public string RedirectUri
        {
            get { return GoogleAuthConsts.InstalledAppRedirectUri; }
        }

        /// <inheritdoc/>
        public Task<AuthorizationCodeResponseUrl> ReceiveCodeAsync(AuthorizationCodeRequestUrl url,
            CancellationToken taskCancellationToken)
        {
            var authorizationUrl = url.Build().ToString();

#if NETSTANDARD1_3
            Logger.Debug("Requested user open a browser with \"{0}\" URL", authorizationUrl);
            Console.WriteLine("Please visit the following URL in a web browser, then enter the code shown after authorization:");
            Console.WriteLine(authorizationUrl);
            Console.WriteLine();
#elif NET45
            Logger.Debug("Open a browser with \"{0}\" URL", authorizationUrl);
            System.Diagnostics.Process.Start(authorizationUrl);

#elif DNX451
            Logger.Debug("Open a browser with \"{0}\" URL", authorizationUrl);
            System.Diagnostics.Process.Start(authorizationUrl);
#else
#error Unsupported target
#endif

            string code = string.Empty;
            while (string.IsNullOrEmpty(code))
            {
                Console.WriteLine("Please enter code: ");
                code = Console.ReadLine();
            }

            Logger.Debug("Code is: \"{0}\"", code);

            return Task.FromResult(new AuthorizationCodeResponseUrl { Code = code });
        }
    }
}