using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using Flurl;

namespace Sony.Filtr.YouTube.Api
{
    public class GoogleOAuth2Api
    {
        //private const string ClientID = "496029115583-2gm32qtrt13t9om4ufuh23rlmvo4fj5b.apps.googleusercontent.com";
        //private const string ClientSecret = "yIu9_L4xi11aWqT5H1uuE7jb";

        //private const string ClientID = "1066394547140-bpkvl6vd6detutas90bvm98d7sgbusqa.apps.googleusercontent.com";
        //private const string ClientSecret = "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";

        private readonly string clientId;
        private readonly string secret;

        public GoogleOAuth2Api(string clientId, string secret)
        {
            this.clientId = clientId;
            this.secret = secret;
        }

        public async Task<AccessTokenResponse> RequestRefreshedAccessTokenAsync(string refreshToken)
        {
            var url = new Url("https://accounts.google.com/o/oauth2/token");
            Dictionary<string, string> requestParams = new Dictionary<string, string>()
            {
                { "client_id", this.clientId },
                { "client_secret", this.secret },
                { "refresh_token", refreshToken },
                { "grant_type", "refresh_token" },
            };

            var client = new HttpClient();
            var response = await client.PostAsync(url, new FormUrlEncodedContent(requestParams));
            var accessTokenResponse = await response.Content.ReadAsAsync<AccessTokenResponse>();
            return accessTokenResponse;
        }

        public async Task<AccessTokenInfoResponse> GetMe(AccessTokenResponse accessToken)
        {
            var client = new HttpClient();
            var url = new Url("https://www.googleapis.com/oauth2/v1/tokeninfo");
            url.SetQueryParam("access_token", accessToken.access_token);

            var response = await client.GetAsync(url);
            var accessTokenInfo = await response.Content.ReadAsAsync<AccessTokenInfoResponse>();
            return accessTokenInfo;
        }

        public async Task<UserInfoResponse> GetUserInfo(AccessTokenResponse accessToken)
        {
            var client = new HttpClient();
            var url = new Url("https://www.googleapis.com/oauth2/v1/userinfo");
            url.SetQueryParam("access_token", accessToken.access_token);

            var response = await client.GetAsync(url);
            var userInfo = await response.Content.ReadAsAsync<UserInfoResponse>();
            return userInfo;
        }

        public class AccessTokenResponse
        {
            public string access_token { get; set; }
            public string token_type { get; set; }
            public string expires_in { get; set; }
            public string refresh_token { get; set; }
        }

        public class AccessTokenInfoResponse
        {
            public string audience { get; set; }
            public string user_id { get; set; }
            public string scope { get; set; }
            public string expires_in { get; set; }
        }

        public class UserInfoResponse
        {
            public string id { get; set; }
            public string name { get; set; }
            public string given_name { get; set; }
            public string family_name { get; set; }
            public string link { get; set; }
            public string picture { get; set; }
            public string gender { get; set; }
            public string locale { get; set; }
        }
    }
}