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 readonly string _redirectUrl;
        private const string ClientID = "496029115583-2gm32qtrt13t9om4ufuh23rlmvo4fj5b.apps.googleusercontent.com";
        private const string ClientSecret = "yIu9_L4xi11aWqT5H1uuE7jb";

        //public GoogleOAuth2Api(string redirectUrl)
        //{
        //    _redirectUrl = redirectUrl;
        //}

        //public async Task<AccessTokenResponse> PostTokenAsync(string code)
        //{
        //    var url = new Url("https://www.googleapis.com/oauth2/v3/token");
        //    url.SetQueryParam("code", code);
        //    url.SetQueryParam("client_id", ClientID);
        //    url.SetQueryParam("client_secret", ClientSecret);
        //    url.SetQueryParam("redirect_uri", _redirectUrl);
        //    url.SetQueryParam("grant_type", "authorization_code");

        //    var client = new HttpClient();
        //    var response = await client.PostAsync(url, new StringContent(string.Empty));
        //    var accessTokenResponse = await response.Content.ReadAsAsync<AccessTokenResponse>();
        //    return accessTokenResponse;
        //}

        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", ClientID },
                { "client_secret", ClientSecret },
                { "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; }
        }

        //public string GetRedirectUrl()
        //{
        //    var authUrl = new Url("https://accounts.google.com/o/oauth2/auth");
        //    authUrl.SetQueryParam("client_id", ClientID);
        //    authUrl.SetQueryParam("redirect_uri", _redirectUrl);
        //    authUrl.SetQueryParam("scope", "profile https://www.googleapis.com/auth/youtube https://www.googleapis.com/auth/userinfo.profile");
        //    authUrl.SetQueryParam("response_type", "code");
        //    authUrl.SetQueryParam("access_type", "offline");

        //    authUrl.SetQueryParam("approval_prompt", "force");
        //    return authUrl;
        //}
    }
}