using System;
using System.Collections.Generic;
using System.Threading.Tasks;

using Xamarin.Forms;
using Amazon;
using Amazon.CognitoIdentity;
using Amazon.CognitoIdentityProvider;
using Amazon.CognitoIdentityProvider.Model;

namespace Prototype
{
    class SignUpPage : ContentPage
    {
        Entry usernameEntry, passwordEntry, emailEntry;
        Label messageLabel;
        CognitoAWSCredentials credentials;
        AmazonCognitoIdentityProviderClient providerClient;

        public SignUpPage()
        {
            messageLabel = new Label();
            usernameEntry = new Entry
            {
                Placeholder = "username"
            };
            passwordEntry = new Entry
            {
                IsPassword = true
            };
            emailEntry = new Entry();
            var signUpButton = new Button
            {
                Text = "Sign Up"
            };
            signUpButton.Clicked += OnSignUpButtonClicked;

            Title = "Sign Up";
            Content = new StackLayout
            {
                VerticalOptions = LayoutOptions.StartAndExpand,
                Children = {
                    new Label { Text = "Username" },
                    usernameEntry,
                    new Label { Text = "Password" },
                    passwordEntry,
                    new Label { Text = "Email address" },
                    emailEntry,
                    signUpButton,
                    messageLabel
                }
            };
        }

        async void OnSignUpButtonClicked(object sender, EventArgs e)
        {
            credentials = new CognitoAWSCredentials(
              "ap-northeast-1:XXXXXXXXXXXXXXXXXXX", // Identity Pool ID
               RegionEndpoint.APNortheast1 // Region
            );

            providerClient = new AmazonCognitoIdentityProviderClient(credentials, RegionEndpoint.APNortheast1);
            SignUpRequest sr = new SignUpRequest();
            sr.ClientId = "XXXXXXXXXX";
            sr.Username = usernameEntry.Text;
            sr.Password = passwordEntry.Text;
            sr.UserAttributes = new List<AttributeType> {
                new AttributeType
                {
                    Name = "email",
                    Value = emailEntry.Text,
                }
            };
            var result = await providerClient.SignUpAsync(sr);
        }
    }
}