@using System.Net.Http;
@using System.Text.Json;
@using TSC2.Components.Layout;
@using TSC2.Components.CSharp;

@page "/signin-google"

@inject NavigationManager _navigationManager

@code {

    [Parameter][SupplyParameterFromQuery] public string? code { get; set; }
    [Parameter][SupplyParameterFromQuery] public string? scope { get; set; }
    [Parameter][SupplyParameterFromQuery] public string? authuser { get; set; }
    [Parameter][SupplyParameterFromQuery] public string? prompt { get; set; }

    protected override async Task OnAfterRenderAsync(bool firstRender) // Executes every page load; run inexpensive rendering code here
    {
        if (!firstRender)
            return;

        var dct = new Dictionary<string, string>();

        dct["client_id"] = TSC2.Components.CSharp.Credentials.GoogleClientId;
        dct["client_secret"] = TSC2.Components.CSharp.Credentials.GoogleClientSecret;
        dct["code"] = code;
        dct["grant_type"] = "authorization_code";
        dct["redirect_uri"] = TSC2.Components.Layout.MainLayout.GoogleRedirect;   
        try
        {
            string auth_json = "";
            string profile_json = "";

            // Get access token for the auth session
            using(var client = new HttpClient())
            using(var content = new FormUrlEncodedContent(dct))
            {
                HttpResponseMessage response = await client.PostAsync("https://oauth2.googleapis.com/token", content);
                auth_json = await response.Content.ReadAsStringAsync();
            }
            OAuthTokenResponse tokenResponse = JsonSerializer.Deserialize<OAuthTokenResponse>(auth_json);

            // Use the access token to access their information; name, email, & token
            using (var client = new HttpClient())
            {
                profile_json = await client.GetStringAsync("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + tokenResponse.access_token);
                // I think this is the json response?? who knows!
            }
            GoogleProfileResponse profileResponse = JsonSerializer.Deserialize<GoogleProfileResponse>(profile_json);

            if (MainLayout.Session.Count == 0) // Fpr security, only add to the session if nothing exists in the session.
            {
                // Add variables to the session
                MainLayout.Session.Add("id", profileResponse.id);
                MainLayout.Session.Add("email", profileResponse.email);
                MainLayout.Session.Add("name", profileResponse.name);
                MainLayout.UpdateGreeting();

                // Contact database
                DatabaseManager.SignInGoogle();
            }
            
            _navigationManager.NavigateTo("/");
        }
        catch (Exception ex)
        {
            // Handler
            Console.WriteLine("ERORR" + ex);
        }

    }



    // Data classes to handle the Http responses
    public class OAuthTokenResponse
    {
        public string access_token { get; set; }
        public int expires_in { get; set; }
        public string refresh_token { get; set; }
        public string scope { get; set; }
        public string token_type { get; set; }
        public string id_token { get; set; }
        public string error { get; set; }
        public string error_description { get; set; }

        public bool IsSuccess => string.IsNullOrEmpty(error);
    }

    public class GoogleProfileResponse
    {
        public string id { get; set; }
        public string email { get; set; }
        public string email_verified { get; set; }
        public string family_name { get; set; }
        public string given_name { get; set; }
        public string name { get; set; }
        public string picture { get; set; }
        public string profile { get; set; }
    }
}