using Pilz.UI;
using Pilz.UI.Telerik.Dialogs;
using Pilz.Updating.Client.Gui.LangRes;
using Telerik.WinControls;

namespace Pilz.Updating.Client.Gui;

public class UpdateClientGui
{
    // E v e n t s

    public event UpdateEndedEventHandler OnUpdateEnded;

    // F i e l d s

    private Form parentForm;
    private UpdateWindow curProgressDialog;
    private readonly UpdateClient updateClient;

    // P r o p e r t i e s

    public bool UseHiddenSearch { get; set; }

    private static Image MyAppIcon => Icon.ExtractAssociatedIcon(IO.Extensions.GetExecutablePath()).ToBitmap();

    // C o n s t r u c t o r s

    public UpdateClientGui(UpdateClient updateClient)
    {
        this.updateClient = updateClient;
        updateClient.OnStatusChanged += UpdateClient_OnStatusChanged;
    }

    ~UpdateClientGui()
    {
        updateClient.OnStatusChanged -= UpdateClient_OnStatusChanged;
    }

    // F e a t u r e s

    public async Task UpdateInteractive(Form parentForm)
    {
        this.parentForm = parentForm;
        await updateClient.UpdateInteractive();
    }

    private void EndUpdating()
    {
        EndUpdating(false);
    }

    private void EndUpdating(bool success)
    {
        curProgressDialog.AllowClose = true;
        curProgressDialog?.Invoke(curProgressDialog.Close);
        OnUpdateEnded?.Invoke(this, new(success));
    }

    // E v e n t s

    private void UpdateClient_OnStatusChanged(object sender, UpdateStatusEventArgs e)
    {
        void setStatus()
        {
            if (e.Event == UpdateStatusEvent.PreEvent)
                SetStatus(e.Status);
        }

        switch (e.Status)
        {
            case UpdateStatus.Downloading:
                setStatus();
                if (e.Event == UpdateStatusEvent.PostEvent)
                {
                    if (e.Client.UpdatePackageInfo == null && !UseHiddenSearch)
                        RadMessageBox.Show(UpdatingClientGuiLangRes.MsgBox_NoUpdatesFound, UpdatingClientGuiLangRes.MsgBox_NoUpdatesFound_Titel, MessageBoxButtons.OK, RadMessageIcon.Info);

                    if (e.Client.UpdatePackageInfo != null && !ShowUpdatesAvailable(e.Client.UpdatePackageInfo))
                        e.Cancel = true;
                }
                break;
        }

        switch (e.Status)
        {
            case UpdateStatus.Downloading:
            case UpdateStatus.Extracting:
            case UpdateStatus.Copying:
            case UpdateStatus.Cleanup:
            case UpdateStatus.Waiting:
                setStatus();
                break;
        }

        switch (e.Status)
        {
            case UpdateStatus.Done:
                EndUpdating(true);
                break;
            case UpdateStatus.Failed:
            case UpdateStatus.Canceled:
                EndUpdating();
                break;
        }
    }

    private void SetStatus(UpdateStatus status)
    {
        var useGui = false;

        if (!(status == UpdateStatus.Searching && UseHiddenSearch))
        {
            useGui = true;
        }

        if (useGui && curProgressDialog is null)
        {
            parentForm.Invoke(() =>
            {
                curProgressDialog = new UpdateWindow(updateClient.ApplicationName);
                curProgressDialog.SetStatus(UpdateStatus.Waiting);
                curProgressDialog.Show(parentForm);
            });
        }

        curProgressDialog?.Invoke(() =>
        {
            curProgressDialog.SetStatus(status);
            curProgressDialog.Show(); // Might be hidden between update check and installation.
        });
    }

    private bool ShowUpdatesAvailable(UpdatePackageInfo pkg)
    {
        var dres = default(DialogResult);
        bool cancel;

        // Hide progress dialog
        curProgressDialog?.Invoke(new Action(curProgressDialog.Hide));

        // Show updates available dialog
        parentForm.Invoke(() =>
        {
            var dialog = new UpdatesAvailableDialog(
                MyAppIcon,
                updateClient.CurrentVersion.Version.ToString(),
                updateClient.CurrentVersion.Channel.ToString(),
                updateClient.CurrentVersion.Build.ToString(),
                pkg.Version.Version.ToString(),
                pkg.Version.Channel.ToString(),
                pkg.Version.Build.ToString(),
                pkg.Notes,
                updateClient.InstallAsAdmin);
            var symbol = GlobalSymbolFactory.Instance.GetImage(GlobalSymbols.software_installer, UI.Telerik.SvgImageSize.Small).ToIcon();
            dres = RadDialogBase.ShowDialog(dialog, parentForm, GeneralLangRes.Title_UpdatesAvailable, symbol).Result;
        });

        if (dres != DialogResult.OK)
        {
            // Cancel
            cancel = true;
            EndUpdating();
        }
        else
        {
            // Continue
            cancel = false;
            curProgressDialog?.Invoke(new Action(curProgressDialog.Show));
        }

        return cancel;
    }
}