using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using InstaSoftOfficeTool.Models;
using InstaSoftOfficeTool.Services;

namespace InstaSoftOfficeTool.Pages
{
    public partial class ProgressPage : Page
    {
        private readonly MainWindow _main;
        private readonly InstallConfig _config;

        public ProgressPage(MainWindow main, InstallConfig config)
        {
            InitializeComponent();
            _main = main;
            _config = config;
        }

        public async void StartInstallation()
        {
            try
            {
                if (_config.IsMsiInstall)
                {
                    await StartMsiInstallation();
                }
                else
                {
                    await StartOdtInstallation();
                }
            }
            catch (Exception ex)
            {
                AppendLog("HIBA: " + ex.Message);
                ShowDone(false, "Váratlan hiba történt.");
            }
        }

        private async Task StartOdtInstallation()
        {
            // Step 1: Download ODT
            SetStepActive(Step1Icon, Step1Text);
            AppendLog("ODT letöltése indul...");

            var downloader = new OdtDownloader();
            downloader.StatusChanged += msg => Dispatcher.Invoke(() => AppendLog(msg));

            bool downloaded = await downloader.DownloadAndExtractAsync();
            if (!downloaded)
            {
                SetStepError(Step1Icon, Step1Text);
                ShowDone(false, "Az ODT letöltése sikertelen.");
                return;
            }
            SetStepDone(Step1Icon, Step1Text);

            // Step 2: Generate config XML
            SetStepActive(Step2Icon, Step2Text);
            AppendLog("Konfigurációs XML generálása...");

            string xml = OdtXmlGenerator.Generate(_config);
            string xmlPath = Path.Combine(downloader.OdtFolder, "configuration.xml");
            File.WriteAllText(xmlPath, xml);
            AppendLog("XML mentve: " + xmlPath);

            SetStepDone(Step2Icon, Step2Text);

            // Step 3: Run setup.exe /configure
            SetStepActive(Step3Icon, Step3Text);
            AppendLog("Office telepítés indítása...");
            AppendLog("setup.exe /configure \"" + xmlPath + "\"");

            int exitCode = await downloader.RunSetupAsync(xmlPath, msg =>
                Dispatcher.Invoke(() => AppendLog(msg)));

            if (exitCode == 0)
            {
                SetStepDone(Step3Icon, Step3Text);
                ShowDone(true, "Az Office sikeresen települt!");
            }
            else
            {
                SetStepError(Step3Icon, Step3Text);
                ShowDone(false, "A telepítés hibakóddal fejeződött be: " + exitCode);
            }
        }

        private async Task StartMsiInstallation()
        {
            string isoUrl = _config.GetIsoUrl();
            if (string.IsNullOrEmpty(isoUrl))
            {
                ShowDone(false, "Nincs elérhető ISO a kiválasztott architektúrához.");
                return;
            }

            // Update step labels for MSI flow
            Dispatcher.Invoke(() =>
            {
                Step1Text.Text = "Telepítő ISO letöltése...";
                Step2Text.Text = "ISO csatolása...";
                Step3Text.Text = "Office 2016 telepítése...";
            });

            var installer = new MsiInstaller();
            installer.StatusChanged += msg => Dispatcher.Invoke(() => AppendLog(msg));
            installer.DownloadProgress += (received, total) =>
            {
                Dispatcher.Invoke(() =>
                {
                    long receivedMb = received / 1024 / 1024;
                    if (total > 0)
                    {
                        long totalMb = total / 1024 / 1024;
                        int percent = (int)(received * 100 / total);
                        DownloadInfo.Text = receivedMb + " MB / " + totalMb + " MB (" + percent + "%)";
                        MainProgress.IsIndeterminate = false;
                        MainProgress.Value = percent;
                    }
                    else
                    {
                        DownloadInfo.Text = receivedMb + " MB letöltve...";
                    }
                    DownloadInfo.Visibility = Visibility.Visible;
                });
            };

            // Step 1: Download ISO
            SetStepActive(Step1Icon, Step1Text);
            AppendLog("ISO letöltése indul...");

            bool downloaded = await installer.DownloadIsoAsync(isoUrl);
            if (!downloaded)
            {
                SetStepError(Step1Icon, Step1Text);
                ShowDone(false, "Az ISO letöltése sikertelen.");
                return;
            }
            SetStepDone(Step1Icon, Step1Text);

            // Hide download progress, reset progress bar
            Dispatcher.Invoke(() =>
            {
                DownloadInfo.Visibility = Visibility.Collapsed;
                MainProgress.IsIndeterminate = true;
            });

            // Step 2: Mount ISO
            SetStepActive(Step2Icon, Step2Text);
            bool mounted = await installer.MountIsoAsync();
            if (!mounted)
            {
                SetStepError(Step2Icon, Step2Text);
                ShowDone(false, "Az ISO csatolása sikertelen.");
                return;
            }
            SetStepDone(Step2Icon, Step2Text);

            // Step 3: Run setup.exe
            SetStepActive(Step3Icon, Step3Text);
            int exitCode = await installer.RunSetupAsync(msg =>
                Dispatcher.Invoke(() => AppendLog(msg)));

            // Dismount ISO regardless of result
            await installer.DismountIsoAsync();

            if (exitCode == 0)
            {
                SetStepDone(Step3Icon, Step3Text);

                // Apply product key if provided
                if (!string.IsNullOrEmpty(_config.ProductKey))
                {
                    AppendLog("Termékkulcs telepítése...");
                    var lm = new LicenseManager();
                    if (lm.FindOspp())
                    {
                        string inpResult = await lm.InstallKeyAsync(_config.ProductKey);
                        AppendLog(inpResult);
                        AppendLog("Aktiválás...");
                        string actResult = await lm.ActivateAsync();
                        AppendLog(actResult);
                    }
                    else
                    {
                        AppendLog("Az ospp.vbs nem található — a kulcsot később a Licenc-kezelésben adhatja meg.");
                    }
                }

                ShowDone(true, "Az Office 2016 sikeresen települt!");
            }
            else
            {
                SetStepError(Step3Icon, Step3Text);
                ShowDone(false, "A telepítés hibakóddal fejeződött be: " + exitCode);
            }
        }

        private void AppendLog(string text)
        {
            LogText.Text += DateTime.Now.ToString("HH:mm:ss") + "  " + text + "\n";
            LogText.ScrollToEnd();
        }

        private void SetStepActive(TextBlock icon, TextBlock text)
        {
            Dispatcher.Invoke(() =>
            {
                icon.Text = "\uE72A";
                icon.Foreground = (Brush)FindResource("AccentBrush");
                text.Foreground = (Brush)FindResource("TextPrimaryBrush");
                text.FontWeight = FontWeights.SemiBold;
            });
        }

        private void SetStepDone(TextBlock icon, TextBlock text)
        {
            Dispatcher.Invoke(() =>
            {
                icon.Text = "\uE73E";
                icon.Foreground = (Brush)FindResource("SuccessBrush");
                text.Foreground = (Brush)FindResource("SuccessBrush");
                text.FontWeight = FontWeights.Normal;
            });
        }

        private void SetStepError(TextBlock icon, TextBlock text)
        {
            Dispatcher.Invoke(() =>
            {
                icon.Text = "\uE711";
                icon.Foreground = (Brush)FindResource("ErrorBrush");
                text.Foreground = (Brush)FindResource("ErrorBrush");
                text.FontWeight = FontWeights.Normal;
            });
        }

        private void ShowDone(bool success, string message)
        {
            Dispatcher.Invoke(() =>
            {
                MainProgress.IsIndeterminate = false;
                MainProgress.Value = 100;
                TitleText.Text = success ? "Telep\u00edt\u00e9s befejezve" : "Telep\u00edt\u00e9s sikertelen";

                DoneIcon.Text = success ? "\uE73E" : "\uE711";
                DoneIcon.Foreground = success
                    ? (Brush)FindResource("SuccessBrush")
                    : (Brush)FindResource("ErrorBrush");
                DoneText.Text = message;
                DoneText.Foreground = DoneIcon.Foreground;
                DonePanel.Visibility = Visibility.Visible;

                if (success)
                {
                    // Show activate card if no product key was provided
                    if (string.IsNullOrEmpty(_config.ProductKey))
                    {
                        ActivateCard.Visibility = Visibility.Visible;
                    }

                    // Show launch buttons
                    BuildLaunchButtons();
                    LaunchCard.Visibility = Visibility.Visible;
                }

                _main.ShowCloseButton();
            });
        }

        private void BuildLaunchButtons()
        {
            LaunchButtons.Children.Clear();

            var apps = new[]
            {
                ("Word", "WINWORD.EXE"),
                ("Excel", "EXCEL.EXE"),
                ("PowerPoint", "POWERPNT.EXE"),
                ("Outlook", "OUTLOOK.EXE"),
            };

            foreach (var (name, exe) in apps)
            {
                // Skip if excluded
                if (_config.ExcludedApps.Contains(name == "Word" ? "Word" :
                    name == "Excel" ? "Excel" :
                    name == "PowerPoint" ? "PowerPoint" :
                    name == "Outlook" ? "Outlook" : ""))
                    continue;

                var btn = new Button
                {
                    Content = name,
                    Style = (Style)FindResource("SecondaryButton"),
                    Padding = new Thickness(18, 8, 18, 8),
                    FontSize = 13,
                    Margin = new Thickness(0, 0, 8, 0),
                    Tag = exe
                };
                btn.Click += LaunchApp_Click;
                LaunchButtons.Children.Add(btn);
            }
        }

        private void LaunchApp_Click(object sender, RoutedEventArgs e)
        {
            var btn = (Button)sender;
            var exe = (string)btn.Tag;

            try
            {
                // Try common Office paths
                var paths = new[]
                {
                    Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles),
                        "Microsoft Office", "root", "Office16", exe),
                    Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86),
                        "Microsoft Office", "root", "Office16", exe),
                    Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles),
                        "Microsoft Office", "Office16", exe),
                };

                foreach (var path in paths)
                {
                    if (File.Exists(path))
                    {
                        Process.Start(path);
                        return;
                    }
                }

                // Fallback: let Windows find it
                Process.Start(exe);
            }
            catch
            {
                AppendLog("Nem siker\u00fclt elind\u00edtani: " + exe);
            }
        }

        private async void BtnActivateNow_Click(object sender, RoutedEventArgs e)
        {
            string key = await _main.AskProductKeyAsync();
            if (string.IsNullOrEmpty(key)) return;

            BtnActivateNow.IsEnabled = false;
            BtnActivateNow.Content = "Aktiv\u00e1l\u00e1s...";

            var lm = new LicenseManager();
            if (!lm.FindOspp())
            {
                AppendLog("Az ospp.vbs nem tal\u00e1lhat\u00f3.");
                BtnActivateNow.IsEnabled = true;
                BtnActivateNow.Content = "Aktiv\u00e1l\u00e1s";
                return;
            }

            AppendLog("Term\u00e9kkulcs telep\u00edt\u00e9se: " + key);
            string inpResult = await lm.InstallKeyAsync(key);
            AppendLog(inpResult);

            AppendLog("Aktiv\u00e1l\u00e1s...");
            string actResult = await lm.ActivateAsync();
            AppendLog(actResult);

            if (actResult.Contains("successful") || actResult.Contains("sikeres"))
            {
                BtnActivateNow.Content = "Aktiv\u00e1lva \u2713";
                AppendLog("Az Office sikeresen aktiv\u00e1lva!");
            }
            else
            {
                BtnActivateNow.IsEnabled = true;
                BtnActivateNow.Content = "Aktiv\u00e1l\u00e1s";
                AppendLog("Az aktiv\u00e1l\u00e1s eredm\u00e9ny\u00e9t ellen\u0151rizze a kimenetben.");
            }
        }
    }
}