using System.IO;
using System.Windows.Controls;
using ClaudeDo.Installer.Core;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Win32;

namespace ClaudeDo.Installer.Pages.WelcomePage;

public partial class WelcomePageViewModel : ObservableObject, IInstallerPage
{
    private readonly InstallContext _context;
    private WelcomePageView? _view;

    public string Title => "Welcome";
    public string Icon => "\uE80F";
    public int Order => 0;
    public bool ShowInWizard => true;
    public bool ShowInSettings => false;
    public UserControl View => _view ??= new WelcomePageView { DataContext = this };

    [ObservableProperty] private string _sourceDirectory = "";
    [ObservableProperty] private string _installDirectory = @"C:\Program Files\ClaudeDo";
    [ObservableProperty] private string? _sourceError;
    [ObservableProperty] private string? _installError;

    public WelcomePageViewModel(InstallContext context)
    {
        _context = context;
        _sourceDirectory = DetectSourceDirectory();
    }

    public Task LoadAsync()
    {
        if (!string.IsNullOrEmpty(_context.SourceDirectory))
            SourceDirectory = _context.SourceDirectory;
        if (!string.IsNullOrEmpty(_context.InstallDirectory))
            InstallDirectory = _context.InstallDirectory;
        return Task.CompletedTask;
    }

    public Task ApplyAsync()
    {
        _context.SourceDirectory = SourceDirectory;
        _context.InstallDirectory = InstallDirectory;
        return Task.CompletedTask;
    }

    public bool Validate()
    {
        var valid = true;

        if (string.IsNullOrWhiteSpace(SourceDirectory) ||
            !File.Exists(Path.Combine(SourceDirectory, "ClaudeDo.slnx")))
        {
            SourceError = "Source directory must contain ClaudeDo.slnx";
            valid = false;
        }
        else
        {
            SourceError = null;
        }

        if (string.IsNullOrWhiteSpace(InstallDirectory))
        {
            InstallError = "Install directory is required";
            valid = false;
        }
        else
        {
            InstallError = null;
        }

        return valid;
    }

    [RelayCommand]
    private void BrowseSource()
    {
        var dialog = new OpenFolderDialog { Title = "Select ClaudeDo source directory" };
        if (dialog.ShowDialog() == true)
            SourceDirectory = dialog.FolderName;
    }

    [RelayCommand]
    private void BrowseInstall()
    {
        var dialog = new OpenFolderDialog { Title = "Select installation directory" };
        if (dialog.ShowDialog() == true)
            InstallDirectory = dialog.FolderName;
    }

    private static string DetectSourceDirectory()
    {
        var dir = AppContext.BaseDirectory;
        for (var i = 0; i < 8; i++)
        {
            if (File.Exists(Path.Combine(dir, "ClaudeDo.slnx")))
                return dir;
            var parent = Directory.GetParent(dir)?.FullName;
            if (parent is null) break;
            dir = parent;
        }
        return "";
    }
}