using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.Mobile;
using Plugin.BLE.Abstractions.EventArgs;
using Xamarin.Essentials;
using Xamarin.Forms;
using XF.Material.Forms.UI.Dialogs;

namespace comal.timesheets
{
    public partial class PINLoginPage : ContentPage
    {
        String pin = "";
        bool autoChange = false;
        bool twoFAvisible = false;
        bool checkingClipBoard = false;
        string loadFromIOSLink = "";
        bool timerRunning = false;
        Timer timer;
        public PINLoginPage(string logindetails = "")
        {
            InitializeComponent();
            //ShowSplashPage();
            try
            {
                ShowPINPad();
                CheckForLatestVersion();
                if (!string.IsNullOrWhiteSpace(logindetails))
                    loadFromIOSLink = logindetails;
            }
            catch
            {
                ShowPINPad();
            }
        }

        protected override void OnAppearing()
        {
            try
            {
                CheckLoadFromLink();

                if (!CheckAndPaste2FAText())
                    return;

                SetPinAndShowSplash();

                if (App.IsUserLoggedIn && GlobalVariables.ChangeUser == false)
                {
                    LaunchMainPage();
                    return;
                }
                else
                {
                    if (String.IsNullOrWhiteSpace(App.DBSettings.UserID) || String.IsNullOrWhiteSpace(App.DBSettings.Password))
                    {
                        DisplayAlert("Unable to log in", "User ID or password is blank", "OK");
                        ShowPINPad();
                        return;
                    }
                    RunValidate();
                }

            }
            catch
            {
                ShowPINPad();
            }
            base.OnAppearing();
        }

        private void SetPinAndShowSplash()
        {
            try
            {
                GlobalVariables.InternalOnAppearing = false;
                pin = "";
                PIN.Text = "";
                ShowSplashPage();
            }
            catch { }
        }

        private void CheckLoadFromLink()
        {
            try
            {
                if (!string.IsNullOrWhiteSpace(loadFromIOSLink))
                {
                    GlobalVariables.LoadFromLinkString = loadFromIOSLink.Remove(0, 17);
                    MobileUtils.LoadFromLink();
                }

                if (!string.IsNullOrWhiteSpace(GlobalVariables.LoadFromLinkString))
                {
                    if (GlobalVariables.LoadFromLinkString == "Link has expired")
                        DisplayAlert("Alert", "Link has expired", "OK");
                }
            }
            catch { }
        }

        private bool CheckAndPaste2FAText()
        {
            try
            {
                if (!GlobalVariables.InternalOnAppearing)
                {
                    if (!twoFAvisible)
                        return false;
                    Device.BeginInvokeOnMainThread(async () =>
                    {
                        try
                        {
                            string text = await Clipboard.GetTextAsync();
                            if (text.Length != 6)
                                return;
                            else
                                ent0.Text = text;
                        }
                        catch
                        {
                        }
                    });
                    return false;
                }
                return true;

            }
            catch
            {
                return true;
            }
        }

        private async void RunValidate(bool usePIN = false, string pin = "")
        {
            try
            {
                //ShowSplashPage();
                Guid sessionID = Guid.Empty;
                if (App.Current.Properties.ContainsKey("SessionID"))
                    sessionID = Guid.Parse(App.Current.Properties["SessionID"].ToString());
                ValidationResult result;
                if (usePIN)
                    result = ClientFactory.Validate(pin, sessionID);
                else
                    result = ClientFactory.Validate(App.DBSettings.UserID, App.DBSettings.Password, sessionID);
                switch (result)
                {
                    case ValidationResult.INVALID:
                        ShowPINPad();
                        DisplayAlert("Error logging in", "Invalid User ID, Password or PIN", "OK");
                        return;
                    case ValidationResult.PASSWORD_EXPIRED:
                        await DisplayAlert("Alert", "Your password has expired - please change it", "OK");
                        PasswordResetPage passwordResetPage = new PasswordResetPage(App.DBSettings.UserID);
                        passwordResetPage.OnPasswordReset += () => { Task.Run(() => { Thread.Sleep(1500); Device.BeginInvokeOnMainThread(() => { DisplayAlert("Success", "Password changed", "OK"); RunValidate(); }); }); };
                        Navigation.PushAsync(passwordResetPage);
                        return;
                    case ValidationResult.REQUIRE_2FA:
                        Check2FA();
                        return;
                    case ValidationResult.VALID:
                        if (ClientFactory.PasswordExpiration != DateTime.MinValue)
                        {
                            var timeUntilExpiration = ClientFactory.PasswordExpiration - DateTime.Now;
                            if (timeUntilExpiration.Days < 14)
                            {
                                string chosenOption = await DisplayActionSheet("Alert", $"Password will expire in {timeUntilExpiration.Days} days. Change password now?", null, "Yes", "No");
                                switch (chosenOption)
                                {
                                    case "Yes":
                                        PasswordResetPage passwordResetPage2 = new PasswordResetPage(App.DBSettings.UserID);
                                        passwordResetPage2.OnPasswordReset += () => { Task.Run(() => { Thread.Sleep(1500); Device.BeginInvokeOnMainThread(() => { DisplayAlert("Success", "Password changed", "OK"); RunValidate(); }); }); };
                                        Navigation.PushAsync(passwordResetPage2);
                                        return;
                                    case "No":
                                        break;
                                    default:
                                        break;
                                }
                            }
                        }
                        LaunchMainPage();
                        return;
                    default:
                        ShowPINPad();
                        return;
                }
            }
            catch (Exception ex)
            {
                string chosenOption = await DisplayActionSheet("Connection error - please check your connection. Try again?", "Cancel", null, "Yes", "No");
                switch (chosenOption)
                {
                    case "Yes":
                        Task.Run(() =>
                        {
                            Thread.Sleep(1000);
                            Device.BeginInvokeOnMainThread(() =>
                            {
                                RunValidate();
                            });
                        });
                        break;
                    default:
                        break;
                }
            }
        }

        private async void LaunchMainPage()
        {
            if (!App.Current.Properties.ContainsKey("SessionID"))
                App.Current.Properties.Add("SessionID", ClientFactory.SessionID);
            else
                App.Current.Properties["SessionID"] = ClientFactory.SessionID;
            if (timerRunning)
                timer.Dispose();
            App.Data.Refresh(true);
            Device.BeginInvokeOnMainThread(async () => { await Navigation.PushAsync(new MainPage()); });
        }

        private async void Check2FA()
        {
            try
            {
                string address2FA = "";
                if (!string.IsNullOrWhiteSpace(ClientFactory.Recipient2FA))
                {
                    address2FA = ClientFactory.Recipient2FA;
                }
                Show2FAScreen(address2FA);
            }
            catch { }
        }

        #region 2FA Logic
        private void Show2FAScreen(string address2FA)
        {
            twoFAvisible = true;
            twoFAGrid.IsVisible = true;
            SplashLayout.IsVisible = false;
            PINLayout.IsVisible = false;
            twoFALbl.Text = address2FA;
            MasterGrid.ColumnDefinitions[0].Width = new GridLength(0, GridUnitType.Absolute);
            MasterGrid.ColumnDefinitions[1].Width = new GridLength(0, GridUnitType.Absolute);
            MasterGrid.ColumnDefinitions[2].Width = new GridLength(1, GridUnitType.Star);
            AnimateIcons();
            if (Device.RuntimePlatform == Device.iOS)
                Run2FACheckTimer();

        }

        private void Run2FACheckTimer()
        {
            try
            {
                timer = new Timer(Callback, null, 4000, 500);
                timerRunning = true;
            }
            catch
            { }
        }

        private void Callback(object state)
        {
            try
            {
                if (checkingClipBoard)
                    return;

                checkingClipBoard = true;
                Device.BeginInvokeOnMainThread(async () =>
                {
                    if (string.IsNullOrWhiteSpace(ent0.Text))
                    {
                        if (Clipboard.HasText)
                        {
                            string text = await Clipboard.GetTextAsync();
                            int i = 0;
                            int.TryParse(text, out i);
                            if (i != 0)
                            {
                                if (text.Length != 6)
                                    return;
                                else
                                {
                                    ent0.Text = text;
                                    timer.Dispose();
                                    timer = new Timer(Callback, null, 4000, 500);
                                }
                            }
                        }
                    }
                    checkingClipBoard = false;
                });
            }
            catch { checkingClipBoard = false; }
        }

        private void AnimateIcons()
        {
            image1.TranslateTo(-70, 0, 0);
            image2.TranslateTo(-70, 0, 0);
            image3.TranslateTo(-70, 0, 0);
            image4.TranslateTo(-70, 0, 0);
            image5.TranslateTo(-70, 0, 0);
            image6.TranslateTo(-70, 0, 0);
            image7.TranslateTo(-70, 0, 0);
            image8.TranslateTo(-70, 0, 0);
            image9.TranslateTo(-70, 0, 0);


            Task.Run(() =>
            {
                for (int i = 0; i < 10; i++)
                {
                    Device.BeginInvokeOnMainThread(() => { image1.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image2.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image3.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image4.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image5.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image6.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image7.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image8.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(2500);
                    Device.BeginInvokeOnMainThread(() => { image9.TranslateTo(1200, 0, 30000); });
                    Thread.Sleep(10000);
                    Device.BeginInvokeOnMainThread(() =>
                    {
                        image1.TranslateTo(-70, 0, 0);
                        image2.TranslateTo(-70, 0, 0);
                        image3.TranslateTo(-70, 0, 0);
                        image4.TranslateTo(-70, 0, 0);
                        image5.TranslateTo(-70, 0, 0);
                        image6.TranslateTo(-70, 0, 0);
                        image7.TranslateTo(-70, 0, 0);
                        image8.TranslateTo(-70, 0, 0);
                        image9.TranslateTo(-70, 0, 0);
                    });
                }
            });
        }


        private void ClearBtn_Clicked(object sender, EventArgs e)
        {
            ent0.Text = "";
            ent0.Focus();
            timer.Dispose();
            timer = new Timer(Callback, null, 4000, 500);
        }

        private async void TwoFAEntry0_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            Device.BeginInvokeOnMainThread(async () =>
            {
                if (Clipboard.HasText)
                {
                    string clipboard = await Clipboard.GetTextAsync();
                    if (clipboard.Length == 6 && ent0.Text.Length == 6)
                    {
                        string s = ent0.Text;
                        autoChange = true;
                        ent0.Text = s[0].ToString();
                        ent1.Text = s[1].ToString();
                        ent2.Text = s[2].ToString();
                        ent3.Text = s[3].ToString();
                        ent4.Text = s[4].ToString();
                        ent5.Text = s[5].ToString();
                        ent1.IsEnabled = true;
                        ent2.IsEnabled = true;
                        ent3.IsEnabled = true;
                        ent4.IsEnabled = true;
                        ent5.IsEnabled = true;
                        Animate(true, true, true, true, true, true);
                        ent5.Focus();
                        autoChange = false;
                        CheckEntries();
                        return;
                    }
                }
            });
            if (!string.IsNullOrWhiteSpace(ent0.Text))
            {
                if (ent0.Text.Length == 1)
                {
                    ent1.IsEnabled = true;
                    ent1.Focus();
                    Animate(true);
                }
                if (ent0.Text.Length == 2)
                {
                    autoChange = true;
                    string s = ent0.Text;
                    ent0.Text = s[0].ToString();
                    ent1.Text = s[1].ToString();
                    ent1.IsEnabled = true;
                    ent2.IsEnabled = true;
                    ent2.Focus();
                    Animate(true, true);
                    autoChange = false;
                }
                if (ent0.Text.Length == 3)
                {
                    string s = ent0.Text;
                    autoChange = true;
                    ent0.Text = s[0].ToString();
                    ent1.Text = s[1].ToString();
                    ent2.Text = s[2].ToString();
                    ent1.IsEnabled = true;
                    ent2.IsEnabled = true;
                    ent3.IsEnabled = true;
                    Animate(true, true, true);
                    ent3.Focus();
                    autoChange = false;
                }
                if (ent0.Text.Length == 4)
                {
                    string s = ent0.Text;
                    autoChange = true;
                    ent0.Text = s[0].ToString();
                    ent1.Text = s[1].ToString();
                    ent2.Text = s[2].ToString();
                    ent3.Text = s[3].ToString();
                    ent1.IsEnabled = true;
                    ent2.IsEnabled = true;
                    ent3.IsEnabled = true;
                    ent4.IsEnabled = true;
                    ent4.Focus();
                    Animate(true, true, true, true);
                    autoChange = false;
                }
                if (ent0.Text.Length == 5)
                {
                    string s = ent0.Text;
                    autoChange = true;
                    ent0.Text = s[0].ToString();
                    ent1.Text = s[1].ToString();
                    ent2.Text = s[2].ToString();
                    ent3.Text = s[3].ToString();
                    ent4.Text = s[4].ToString();
                    ent1.IsEnabled = true;
                    ent2.IsEnabled = true;
                    ent3.IsEnabled = true;
                    ent4.IsEnabled = true;
                    ent5.IsEnabled = true;
                    ent5.Focus();
                    Animate(true, true, true, true, true);
                    autoChange = false;
                }
                if (ent0.Text.Length == 6)
                {
                    string s = ent0.Text;
                    autoChange = true;
                    ent0.Text = s[0].ToString();
                    ent1.Text = s[1].ToString();
                    ent2.Text = s[2].ToString();
                    ent3.Text = s[3].ToString();
                    ent4.Text = s[4].ToString();
                    ent5.Text = s[5].ToString();
                    ent5.Focus();
                    ent1.IsEnabled = true;
                    ent2.IsEnabled = true;
                    ent3.IsEnabled = true;
                    ent4.IsEnabled = true;
                    ent5.IsEnabled = true;
                    ent5.Focus();
                    Animate(true, true, true, true, true, true);
                    autoChange = false;
                    CheckEntries();
                }
                ent0.MaxLength = 1;
            }
            else
            {
                ent0.MaxLength = 6;
                ent1.Text = "";
                ent1.IsEnabled = false;
            }
        }

        private async void TwoFAEntry1_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            if (!string.IsNullOrWhiteSpace(ent1.Text))
            {
                await frame1.TranslateTo(0, -15, 150);
                frame1.TranslateTo(0, 0, 150);
                ent2.IsEnabled = true;
                ent2.Focus();
            }
            else
            {
                ent2.IsEnabled = false;
                ent2.Text = "";
            }

        }
        private async void TwoFAEntry2_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            if (!string.IsNullOrWhiteSpace(ent2.Text))
            {
                await frame2.TranslateTo(0, -15, 150);
                frame2.TranslateTo(0, 0, 150);
                ent3.IsEnabled = true;
                ent3.Focus();
            }
            else
            {
                ent3.IsEnabled = false;
                ent3.Text = "";
            }
        }
        private async void TwoFAEntry3_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            if (!string.IsNullOrWhiteSpace(ent3.Text))
            {
                await frame3.TranslateTo(0, -15, 150);
                frame3.TranslateTo(0, 0, 150);
                ent4.IsEnabled = true;
                ent4.Focus();
            }
            else
            {
                ent4.IsEnabled = false;
                ent4.Text = "";
            }
        }
        private async void TwoFAEntry4_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            if (!string.IsNullOrWhiteSpace(ent4.Text))
            {
                await frame4.TranslateTo(0, -15, 150);
                frame4.TranslateTo(0, 0, 150);
                ent5.IsEnabled = true;
                ent5.Focus();
            }
            else
            {
                ent5.IsEnabled = false;
                ent5.Text = "";
            }
        }
        private async void TwoFAEntry5_Changed(object sender, EventArgs e)
        {
            if (autoChange)
                return;
            if (!string.IsNullOrWhiteSpace(ent5.Text))
            {
                Animate(true, true, true, true, true, true);
                CheckEntries();
            }
        }

        private void Animate(bool zero = false, bool one = false, bool two = false, bool three = false, bool four = false, bool five = false)
        {
            Device.BeginInvokeOnMainThread(async () =>
            {
                if (zero)
                {
                    await frame0.TranslateTo(0, -15, 150);
                    frame0.TranslateTo(0, 0, 150);
                }
                if (one)
                {
                    await frame1.TranslateTo(0, -15, 150);
                    frame1.TranslateTo(0, 0, 150);

                }
                if (two)
                {
                    await frame2.TranslateTo(0, -15, 150);
                    frame2.TranslateTo(0, 0, 150);
                }
                if (three)
                {
                    await frame3.TranslateTo(0, -15, 150);
                    frame3.TranslateTo(0, 0, 150);
                }
                if (four)
                {
                    await frame4.TranslateTo(0, -15, 150);
                    frame4.TranslateTo(0, 0, 150);
                }
                if (five)
                {
                    await frame5.TranslateTo(0, -15, 150);
                    frame5.TranslateTo(0, 0, 150);
                }
            });
        }

        //only when last entry is filled
        private void CheckEntries()
        {
            Task.Run(() =>
            {
                Thread.Sleep(750);
                Device.BeginInvokeOnMainThread(async () =>
                {
                    using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Checking"))
                    {
                        try
                        {
                            string s0 = ent0.Text;
                            string s1 = ent1.Text;
                            string s2 = ent2.Text;
                            string s3 = ent3.Text;
                            string s4 = ent4.Text;
                            string s5 = ent5.Text;

                            string fullstring = s0 + s1 + s2 + s3 + s4 + s5;
                            Device.BeginInvokeOnMainThread(() => { clearBtn.Focus(); });

                            bool check2FA = ClientFactory.Check2FA(fullstring);
                            if (check2FA)
                                Device.BeginInvokeOnMainThread(() => { LaunchMainPage(); });
                            else
                                return;
                        }
                        catch (Exception ex)
                        {
                            DisplayAlert("Error with 2FA", ex.Message, "OK");
                        }
                    }
                });
            });
        }
        #endregion

        private void CheckForLatestVersion()
        {
            Task.Run(async () =>
            {
                try
                {
                    bool isLatest = true;

                    try
                    {
                        isLatest = await MobileUtils.AppVersion.IsUsingLatestVersion();
                    }
                    catch (Exception eLatest)
                    {
                        string s = eLatest.Message;
                    }

                    if (!isLatest)
                    {
                        string latestVersionNumber = await MobileUtils.AppVersion.GetLatestVersionNumber();

                        Device.BeginInvokeOnMainThread(async () =>
                        {
                            string chosenOption = await DisplayActionSheet(String.Format("Version {0} Available. Update now?", latestVersionNumber), "You will be reminded again in 10 minutes.", null, "Yes", "No");
                            switch (chosenOption)
                            {
                                case "No":
                                    break;
                                case "Cancel":
                                    break;
                                case "Yes":
                                    Dispatcher.BeginInvokeOnMainThread(() => { MobileUtils.AppVersion.OpenAppInStore(); });
                                    break;
                                default:
                                    break;
                            }
                        });
                    }
                }
                catch { }
            });
        }

        protected override void OnDisappearing()
        {
            base.OnDisappearing();
        }

        private void ShowSplashPage()
        {
            twoFAvisible = false;
            SplashLayout.IsVisible = true;
            PINLayout.IsVisible = false;
            twoFAGrid.IsVisible = false;
            ToolbarItems.Clear();
            ToolbarItems.Add(new ToolbarItem("Settings", "", () =>
            {
                SettingsPage settingsform = new SettingsPage();
                settingsform.Disappearing += Settingsform_Disappearing;
                Navigation.PushAsync(settingsform);
            }));
            MasterGrid.ColumnDefinitions[0].Width = new GridLength(1, GridUnitType.Star);
            MasterGrid.ColumnDefinitions[1].Width = new GridLength(0, GridUnitType.Absolute);
            MasterGrid.ColumnDefinitions[2].Width = new GridLength(0, GridUnitType.Absolute);
        }

        private void ShowPINPad()
        {
            PINLayout.IsVisible = true;
            SplashLayout.IsVisible = false;
            SplashLayout.IsVisible = false;
            MasterGrid.ColumnDefinitions[0].Width = new GridLength(0, GridUnitType.Absolute);
            MasterGrid.ColumnDefinitions[1].Width = new GridLength(1, GridUnitType.Star);
            MasterGrid.ColumnDefinitions[2].Width = new GridLength(0, GridUnitType.Absolute);
            ToolbarItems.Clear();
            ToolbarItems.Add(new ToolbarItem("Settings", "", () =>
            {
                SettingsPage settingsform = new SettingsPage();
                settingsform.Disappearing += Settingsform_Disappearing;
                Navigation.PushAsync(settingsform);
            }));
            pin = "";
            PIN.Text = "";
            OK.IsEnabled = false;
            Back.IsEnabled = false;
        }

        void Button_Click(object sender, EventArgs args)
        {
            pin = pin + (sender as Button).Text;
            PIN.Text = new string('*', pin.Length);
            OK.IsEnabled = true;
            Back.IsEnabled = true;
            ;
        }

        void Back_Click(object sender, EventArgs args)
        {
            // renove the last one
            if (String.IsNullOrEmpty(pin))
                return;
            pin = pin.Substring(0, pin.Length - 1);
            PIN.Text = new string('*', pin.Length);
            OK.IsEnabled = !String.IsNullOrEmpty(pin);
            Back.IsEnabled = !String.IsNullOrEmpty(pin);
        }

        async void OK_Click(object sender, EventArgs args)
        {
            RunValidate(true, pin);
        }

        void Settings_Click(System.Object sender, System.EventArgs e)
        {
            SettingsPage settingsform = new SettingsPage();
            settingsform.Disappearing += Settingsform_Disappearing;
            Navigation.PushAsync(settingsform);
        }

        private async void Settingsform_Disappearing(object sender, EventArgs e)
        {
            try
            {
                if (App.IsUserLoggedIn)
                    await Navigation.PushAsync(new MainPage());
            }
            catch { }
        }
    }
}