using System.Diagnostics;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Media;
using Microsoft.Win32;
using Recordingtest.Player;
using Recordingtest.Player.Model;

namespace Recordingtest.LauncherUI;

public partial class MainWindow : Window
{
    private CancellationTokenSource? _cts;
    private bool _refreshingPath;

    public MainWindow()
    {
        InitializeComponent();
        ScenariosPathBox.Text = FindScenariosDir();
        RefreshScenarioList();
        RefreshSutStatus();
    }

    // ── Scenario folder ─────────────────────────────────────────────────────

    private static string FindScenariosDir()
    {
        var candidates = new[]
        {
            Path.Combine(AppContext.BaseDirectory, "scenarios"),
            Path.Combine(Directory.GetCurrentDirectory(), "scenarios"),
            // walk up 3 levels from exe (dev layout: bin/Debug/net8.0-windows)
            Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "scenarios")),
            Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", "scenarios")),
        };
        foreach (var c in candidates)
            if (Directory.Exists(c)) return c;
        return Path.Combine(Directory.GetCurrentDirectory(), "scenarios");
    }

    private void RefreshScenarioList()
    {
        var dir = ScenariosPathBox.Text?.Trim() ?? "";
        ScenarioListBox.Items.Clear();
        if (!Directory.Exists(dir)) return;
        foreach (var f in Directory.GetFiles(dir, "*.yaml").OrderBy(x => x))
            ScenarioListBox.Items.Add(Path.GetFileNameWithoutExtension(f));
        if (ScenarioListBox.Items.Count > 0)
            ScenarioListBox.SelectedIndex = ScenarioListBox.Items.Count - 1; // select latest
    }

    private void ScenariosPath_TextChanged(object sender,
        System.Windows.Controls.TextChangedEventArgs e)
    {
        if (_refreshingPath) return;
        RefreshScenarioList();
    }

    private void BrowseScenarios_Click(object sender, RoutedEventArgs e)
    {
        var dlg = new OpenFolderDialog { Title = "시나리오 폴더 선택" };
        if (dlg.ShowDialog() == true)
        {
            _refreshingPath = true;
            ScenariosPathBox.Text = dlg.FolderName;
            _refreshingPath = false;
            RefreshScenarioList();
        }
    }

    private void RefreshScenarios_Click(object sender, RoutedEventArgs e) =>
        RefreshScenarioList();

    // ── SUT status ───────────────────────────────────────────────────────────

    private void RefreshSutStatus()
    {
        var procs = Process.GetProcessesByName("EG-BIM Modeler");
        if (procs.Length > 0)
        {
            SutStatusText.Text = $"✓  EG-BIM Modeler 실행 중  (PID {procs[0].Id})";
            SutStatusText.Foreground = new SolidColorBrush(Color.FromRgb(0x2E, 0x7D, 0x32));
        }
        else
        {
            SutStatusText.Text = "✗  SUT 없음 — EG-BIM Modeler를 먼저 실행하세요";
            SutStatusText.Foreground = new SolidColorBrush(Color.FromRgb(0xC6, 0x28, 0x28));
        }
    }

    private void RefreshSut_Click(object sender, RoutedEventArgs e) => RefreshSutStatus();

    // ── Run / Stop ───────────────────────────────────────────────────────────

    private async void Run_Click(object sender, RoutedEventArgs e)
    {
        if (ScenarioListBox.SelectedItem is not string scenarioName)
        {
            AppendLog("[warn] 시나리오를 선택하세요.");
            return;
        }

        var procs = Process.GetProcessesByName("EG-BIM Modeler");
        if (procs.Length == 0)
        {
            AppendLog("[error] EG-BIM Modeler가 실행 중이 아닙니다.");
            return;
        }

        RunButton.IsEnabled  = false;
        StopButton.IsEnabled = true;
        LogBox.Clear();
        AppendLog($"[launcher] 시나리오: {scenarioName}");

        // 3-second countdown so user can move cursor away
        CountdownText.Visibility = Visibility.Visible;
        for (int i = 3; i >= 1; i--)
        {
            CountdownText.Text = $"▶ {i}초 후 시작...";
            await Task.Delay(1000);
        }
        CountdownText.Visibility = Visibility.Collapsed;

        // Minimize launcher so it can't steal focus during playback
        var prevState = WindowState;
        WindowState = WindowState.Minimized;

        _cts = new CancellationTokenSource();
        var scenariosDir = ScenariosPathBox.Text?.Trim() ?? "";

        try
        {
            await Task.Run(() => RunScenario(scenarioName, scenariosDir, _cts.Token));
        }
        catch (OperationCanceledException)
        {
            AppendLog("[launcher] 중단됨.");
        }
        catch (Exception ex)
        {
            AppendLog($"[launcher] 오류: {ex.Message}");
        }
        finally
        {
            WindowState = prevState;
            RunButton.IsEnabled  = true;
            StopButton.IsEnabled = false;
        }
    }

    private void Stop_Click(object sender, RoutedEventArgs e) => _cts?.Cancel();

    // ── Playback ─────────────────────────────────────────────────────────────

    private void RunScenario(string scenarioName, string scenariosDir,
        CancellationToken ct)
    {
        var yamlPath = Path.Combine(scenariosDir, scenarioName + ".yaml");
        if (!File.Exists(yamlPath))
        {
            AppendLog($"[error] 파일 없음: {yamlPath}");
            return;
        }

        Scenario scenario;
        try { scenario = ScenarioLoader.LoadFromFile(yamlPath); }
        catch (Exception ex) { AppendLog($"[error] yaml 파싱 실패: {ex.Message}"); return; }

        var app = UiaPlayerHost.AttachByExeName("EG-BIM Modeler.exe");
        if (app is null)
        {
            AppendLog("[error] EG-BIM Modeler 프로세스에 연결할 수 없습니다.");
            return;
        }

        var artifactDir = Path.Combine("artifacts", "launcher-out", scenarioName);
        Directory.CreateDirectory(artifactDir);

        using var host = new UiaPlayerHost(app, artifactDir);

        // Redirect Console.WriteLine → WPF log box
        var prevOut = Console.Out;
        Console.SetOut(new DispatcherWriter(AppendLog));
        try
        {
            host.BringSutToForeground();
            ct.ThrowIfCancellationRequested();

            var engine = new PlayerEngine(new PlayerEngineOptions { PreserveTiming = true });
            engine.Run(scenario, host);

            AppendLog($"[launcher] ✓ {scenarioName} 완료.");
        }
        finally
        {
            Console.SetOut(prevOut);
        }
    }

    // ── Helpers ──────────────────────────────────────────────────────────────

    private void AppendLog(string msg) =>
        Dispatcher.Invoke(() =>
        {
            LogBox.AppendText(msg + "\n");
            LogScroll.ScrollToBottom();
        });

    /// <summary>Redirects Console.WriteLine output to the WPF log box.</summary>
    private sealed class DispatcherWriter : TextWriter
    {
        private readonly Action<string> _log;
        public override Encoding Encoding => Encoding.UTF8;
        public DispatcherWriter(Action<string> log) => _log = log;
        public override void WriteLine(string? value) => _log(value ?? "");
        public override void Write(string? value) { /* absorb partial writes */ }
    }
}