using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using Follwit.API.Data;

using System.Threading;

using CookComputing.XmlRpc;



namespace Follwit.API.UI.Panels {

    public partial class LoginNewUserPanel : UserControl {

        public enum Action { BACK, VALIDATED }



        public event ActionSelectedDelegate ActionSelected;

        public delegate void ActionSelectedDelegate(Action action);



        private delegate void InvokeDelegate();

        private delegate void InvokeDelegateEx(Exception ex);



        private Color defaultLabelColor;

        private bool verified = false;

        private FollwitApi api = null;



        private bool usernameAvailable = true;

        private string lastCheckedName = "";



        public FitUser ValidatedUser {

            get;

            private set;

        }



        public string ApiUrl {

            get;

            set;

        }



        public LoginNewUserPanel() {

            InitializeComponent();



            ApiUrl = null;

        }



        private void CreateUser() {

            // set the status label to inform the user of whats happening

            statusLabel.ForeColor = defaultLabelColor;

            statusLabel.Text = "Creating new account...";

            statusLabel.Visible = true;



            // disable the log in button so the user doesnt double tap it

            createAccountOkButton.Enabled = false;



            ThreadStart actions = delegate {

                try { 

                    string username = usernameTextBox.Text;

                    string password = passwordTextBox.Text;



                    bool success = FollwitApi.CreateUser(username, password, emailTextBox.Text, "en", privateCheckBox.Checked, ApiUrl);



                    if (success) {

                        api = FollwitApi.Login(username, FollwitApi.HashPassword(password), ApiUrl);

                        ValidatedUser = api.User;

                    }

                    else {

                        api = null;

                        ValidatedUser = null;

                    }

                }

                catch (Exception ex) {                    

                    UnexpectedError(ex);

                    return;

                }



                CreateUserDone();

            };



            Thread verifyLoginThread = new Thread(actions);

            verifyLoginThread.Name = "Authentication Thread";

            verifyLoginThread.IsBackground = true;

            verifyLoginThread.Start();

        }



        private void CreateUserDone() {

            if (InvokeRequired) {

                Invoke(new InvokeDelegate(CreateUserDone));

                return;

            }



            if (api == null) {

                statusLabel.ForeColor = Color.Red;

                statusLabel.Text = "Unexpected Error.";

                statusLabel.Visible = true;



                createAccountOkButton.Text = "Sign In";

                createAccountOkButton.Enabled = true;

                verified = false;

            }

            else {

                statusLabel.ForeColor = Color.Green;

                statusLabel.Text = "Account successfully created!";

                statusLabel.Visible = true;



                createAccountOkButton.Text = "OK";

                createAccountOkButton.Enabled = true;

                verified = true;



                if (ActionSelected != null) ActionSelected(Action.VALIDATED);            

            }

        }



        private void UnexpectedError(Exception ex) {

            if (InvokeRequired) {

                Invoke(new InvokeDelegateEx(UnexpectedError), new object[] { ex });

                return;

            }



            createAccountOkButton.Text = "Create Account";

            createAccountOkButton.Enabled = true;

            verified = false;



            statusLabel.ForeColor = Color.Red;

            if (ex is XmlRpcServerException && ((XmlRpcServerException)ex).Message == "Not Found")

                statusLabel.Text = "Unable to connect to server!";

            else if (ex is UsernameAlreadyExistsException) {

                statusLabel.Text = "Selected username is unavailable!";

            }

            else if (ex is RequiredFieldMissingException) {

                statusLabel.Text = "Missing information: " + ((RequiredFieldMissingException)ex).FieldName;

            }

            else 

                statusLabel.Text = "Unexpected Error: " + ex.Message;

        }



        private void SetStatus() {

            statusLabel.Visible = false;



            if (verified)

                return;



            if (usernameTextBox.Text.Length == 0 || 

                emailTextBox.Text.Length == 0 ||

                passwordTextBox.Text.Length == 0 ||

                verifyPasswordTextBox.Text.Length == 0) 



                createAccountOkButton.Enabled = false;

            else

                createAccountOkButton.Enabled = true;



            if ((passwordTextBox.Text != verifyPasswordTextBox.Text) && verifyPasswordTextBox.Text != "") {

                statusLabel.ForeColor = Color.Red;

                statusLabel.Visible = true;

                statusLabel.Text = "Passwords do not match!";

                createAccountOkButton.Enabled = false;

            }



            CheckUsername();

        }



        private void CheckUsername() {

            // no error if we are editing the username

            if (usernameTextBox.Focused || usernameTextBox.Text == lastCheckedName) {

                

                if (usernameTextBox.Text == lastCheckedName)

                    UsernameChecked();



                return;

            }



            ThreadStart actions = delegate {

                lastCheckedName = usernameTextBox.Text;

                try { usernameAvailable = FollwitApi.IsUsernameAvailable(usernameTextBox.Text, ApiUrl); }

                catch (Exception ex) {

                    UnexpectedError(ex);

                    return;

                }



                UsernameChecked();

            };



            Thread verifyLoginThread = new Thread(actions);

            verifyLoginThread.Name = "Username Check Thread";

            verifyLoginThread.IsBackground = true;

            verifyLoginThread.Start();

        }



        private void UsernameChecked() {

            if (InvokeRequired) {

                Invoke(new InvokeDelegate(UsernameChecked));

                return;

            }



            if (!usernameAvailable) {

                statusLabel.ForeColor = Color.Red;

                statusLabel.Visible = true;

                statusLabel.Text = "Selected username is unavailable!";

                createAccountOkButton.Enabled = false;

            }

        }



        private void backButton_Click(object sender, EventArgs e) {

            SetStatus();



            if (ActionSelected != null) ActionSelected(Action.BACK);

        }



        private void usernameTextBox_TextChanged(object sender, EventArgs e) {

            SetStatus();

        }



        private void passwordTextBox_TextChanged(object sender, EventArgs e) {

            SetStatus();

        }



        private void verifyPasswordTextBox_TextChanged(object sender, EventArgs e) {

            SetStatus();

        }



        private void passwordTextBox_FocusChanged(object sender, EventArgs e) {

            SetStatus();

        }



        private void verifyPasswordTextBox_FocusChanged(object sender, EventArgs e) {

            SetStatus();

        }



        private void LoginNewUserPanel_Load(object sender, EventArgs e) {

            defaultLabelColor = statusLabel.ForeColor;

        }



        private void LoginNewUserPanel_VisibleChanged(object sender, EventArgs e) {

            if (Visible) {

                SetStatus();



                usernameTextBox.Focus();

                usernameTextBox.Text = "";

                emailTextBox.Text = "";

                passwordTextBox.Text = "";

                verifyPasswordTextBox.Text = "";

                privateCheckBox.Checked = false;



                ValidatedUser = null;

                api = null;



                if (ParentForm != null) {                    

                    this.ParentForm.AcceptButton = createAccountOkButton;

                    this.ParentForm.CancelButton = backButton;

                    backButton.DialogResult = DialogResult.None;

                }

            }

            else {

                if (ParentForm != null) {

                    this.ParentForm.AcceptButton = null;

                    this.ParentForm.CancelButton = null;

                }

            }

        }



        private void createAccountOkButton_Click(object sender, EventArgs e) {

            if (!verified)

                CreateUser();

            else

                if (ActionSelected != null) ActionSelected(Action.VALIDATED);            

        }



        private void usernameTextBox_Leave(object sender, EventArgs e) {

            SetStatus();

        }

    }

}