using System.Diagnostics;
using System.Runtime.Versioning;

namespace DevDrive;

/// <summary>
/// Dialog that prompts the user to select which startup apps to launch.
/// </summary>
[SupportedOSPlatform("windows")]
public class StartupDialog : Form
{
    private readonly List<StartupApp> _apps;
    private readonly List<CheckBox> _checkboxes = [];
    private readonly Button _launchButton;
    private readonly Button _cancelButton;

    /// <summary>
    /// Creates a new startup dialog for the given apps.
    /// </summary>
    /// <param name="apps">List of startup apps to display.</param>
    /// <param name="driveName">Name of the drive for the title.</param>
    public StartupDialog(List<StartupApp> apps, string driveName)
    {
        _apps = apps;

        Text = $"{driveName} - Startup Apps";
        FormBorderStyle = FormBorderStyle.FixedDialog;
        StartPosition = FormStartPosition.CenterScreen;
        MaximizeBox = false;
        MinimizeBox = false;
        AutoScaleMode = AutoScaleMode.Dpi;

        var padding = 16;
        var checkboxHeight = 28;
        var buttonHeight = 32;
        var buttonWidth = 100;

        var contentHeight = padding + (_apps.Count * checkboxHeight) + padding + buttonHeight + padding;
        var contentWidth = 350;

        ClientSize = new Size(contentWidth, contentHeight);

        var yPos = padding;

        foreach (var app in _apps)
        {
            var checkbox = new CheckBox
            {
                Text = app.Name,
                Tag = app,
                Checked = app.CheckedByDefault,
                Location = new Point(padding, yPos),
                Size = new Size(contentWidth - (padding * 2), checkboxHeight),
                Font = new Font("Segoe UI", 10)
            };

            _checkboxes.Add(checkbox);
            Controls.Add(checkbox);
            yPos += checkboxHeight;
        }

        yPos += padding;

        _launchButton = new Button
        {
            Text = "Launch",
            DialogResult = DialogResult.OK,
            Location = new Point(contentWidth - padding - buttonWidth - 8 - buttonWidth, yPos),
            Size = new Size(buttonWidth, buttonHeight),
            Font = new Font("Segoe UI", 9)
        };
        _launchButton.Click += OnLaunchClick;
        Controls.Add(_launchButton);

        _cancelButton = new Button
        {
            Text = "Skip",
            DialogResult = DialogResult.Cancel,
            Location = new Point(contentWidth - padding - buttonWidth, yPos),
            Size = new Size(buttonWidth, buttonHeight),
            Font = new Font("Segoe UI", 9)
        };
        Controls.Add(_cancelButton);

        AcceptButton = _launchButton;
        CancelButton = _cancelButton;
    }

    private void OnLaunchClick(object? sender, EventArgs e)
    {
        LaunchSelectedApps();
    }

    /// <summary>
    /// Launches all selected apps.
    /// </summary>
    private void LaunchSelectedApps()
    {
        foreach (var checkbox in _checkboxes)
        {
            if (!checkbox.Checked)
            {
                continue;
            }

            if (checkbox.Tag is not StartupApp app)
            {
                continue;
            }

            try
            {
                var startInfo = new ProcessStartInfo
                {
                    FileName = Environment.ExpandEnvironmentVariables(app.Path),
                    UseShellExecute = true
                };

                if (!string.IsNullOrWhiteSpace(app.Arguments))
                {
                    startInfo.Arguments = Environment.ExpandEnvironmentVariables(app.Arguments);
                }

                if (!string.IsNullOrWhiteSpace(app.WorkingDirectory))
                {
                    startInfo.WorkingDirectory = Environment.ExpandEnvironmentVariables(app.WorkingDirectory);
                }

                Process.Start(startInfo);
                Console.WriteLine($"[DevDrive] Launched: {app.Name}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"[DevDrive] Failed to launch {app.Name}: {ex.Message}");
            }
        }
    }

    /// <summary>
    /// Shows the startup dialog if there are apps to display.
    /// </summary>
    /// <param name="apps">List of startup apps.</param>
    /// <param name="driveName">Name of the drive.</param>
    public static void ShowIfNeeded(List<StartupApp> apps, string driveName)
    {
        if (apps.Count == 0)
        {
            return;
        }

        if (apps.Count == 1)
        {
            var app = apps[0];
            var result = MessageBox.Show(
                $"Launch {app.Name}?",
                $"{driveName} - Startup",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Question
            );

            if (result == DialogResult.Yes)
            {
                LaunchSingleApp(app);
            }
            return;
        }

        Application.EnableVisualStyles();
        using var dialog = new StartupDialog(apps, driveName);
        dialog.ShowDialog();
    }

    private static void LaunchSingleApp(StartupApp app)
    {
        try
        {
            var startInfo = new ProcessStartInfo
            {
                FileName = Environment.ExpandEnvironmentVariables(app.Path),
                UseShellExecute = true
            };

            if (!string.IsNullOrWhiteSpace(app.Arguments))
            {
                startInfo.Arguments = Environment.ExpandEnvironmentVariables(app.Arguments);
            }

            if (!string.IsNullOrWhiteSpace(app.WorkingDirectory))
            {
                startInfo.WorkingDirectory = Environment.ExpandEnvironmentVariables(app.WorkingDirectory);
            }

            Process.Start(startInfo);
            Console.WriteLine($"[DevDrive] Launched: {app.Name}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[DevDrive] Failed to launch {app.Name}: {ex.Message}");
        }
    }
}