using System;
using System.Linq;
using System.Threading.Tasks;
using System.IO;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Input.Platform;
using Avalonia.Interactivity;
using Avalonia.Platform.Storage;
using Avalonia.Media.Imaging;
using finder2e_foundry_converter.ViewModels;

namespace finder2e_foundry_converter.Views
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            AddHandler(DragDrop.DropEvent, Drop);
            AddHandler(DragDrop.DragOverEvent, DragOver);
            AddHandler(KeyDownEvent, OnKeyDown, RoutingStrategies.Bubble, true);
        }

        private void DragOver(object? sender, DragEventArgs e)
        {
            if (e.DataTransfer.TryGetFiles() != null || e.DataTransfer.TryGetBitmap() != null)
            {
                e.DragEffects = DragDropEffects.Copy;
            }
            else
            {
                e.DragEffects = DragDropEffects.None;
            }
        }

        private async void OnKeyDown(object? sender, KeyEventArgs e)
        {
            if (e.Key == Key.V && e.KeyModifiers == KeyModifiers.Control)
            {
                var topLevel = GetTopLevel(this);
                if (topLevel?.Clipboard == null) return;

                var vm = DataContext as MainWindowViewModel;
                if (vm == null) return;

                // Try to get text (for file paths)
                var text = await topLevel.Clipboard.TryGetTextAsync();
                if (!string.IsNullOrWhiteSpace(text))
                {
                    // Handle multiple lines (multiple files)
                    var lines = text.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (var line in lines)
                    {
                        var path = line.Trim();
                        if (path.StartsWith("file://"))
                        {
                            try
                            {
                                var uri = new Uri(path);
                                path = uri.LocalPath;
                            }
                            catch { path = path.Replace("file://", ""); }
                        }

                        if (File.Exists(path))
                        {
                            var ext = Path.GetExtension(path).ToLower();
                            if (new[] { ".png", ".jpg", ".jpeg", ".webp" }.Contains(ext))
                            {
                                vm.AddImagePathCommand.Execute(path);
                                return;
                            }
                        }
                    }
                }

                // Try to get bitmap directly
                var bitmap = await topLevel.Clipboard.TryGetBitmapAsync();
                if (bitmap != null)
                {
                    try
                    {
                        var tempDir = Path.Combine(Path.GetTempPath(), "Finder2eFoundryConverter");
                        if (!Directory.Exists(tempDir)) Directory.CreateDirectory(tempDir);

                        var tempPath = Path.Combine(tempDir, $"pasted_image_{DateTime.Now.Ticks}.png");
                        using (var stream = File.Create(tempPath))
                        {
                            bitmap.Save(stream);
                        }
                        vm.AddImagePathCommand.Execute(tempPath);
                    }
                    catch (Exception ex)
                    {
                        vm.StatusMessage = $"Error saving pasted image: {ex.Message}";
                    }
                }
            }
        }


        private async void SelectImage_Click(object? sender, RoutedEventArgs e)
        {
            var topLevel = GetTopLevel(this);
            if (topLevel == null) return;

            var files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
            {
                Title = "Select Images",
                AllowMultiple = true,
                FileTypeFilter = new[]
                {
                    new FilePickerFileType("Images")
                    {
                        Patterns = new[] { "*.png", "*.jpg", "*.jpeg", "*.webp" }
                    }
                }
            });

            if (files.Count > 0)
            {
                var vm = DataContext as MainWindowViewModel;
                if (vm == null) return;

                foreach (var file in files)
                {
                    vm.AddImagePathCommand.Execute(file.Path.LocalPath);
                }
            }
        }

        private async void Drop(object? sender, DragEventArgs e)
        {
            var vm = DataContext as MainWindowViewModel;
            if (vm == null) return;

            var files = e.DataTransfer.TryGetFiles();
            if (files != null)
            {
                foreach (var file in files)
                {
                    var path = file.Path.LocalPath;
                    if (path == null) continue;

                    var ext = Path.GetExtension(path).ToLower();
                    if (new[] { ".png", ".jpg", ".jpeg", ".webp" }.Contains(ext))
                    {
                        vm.AddImagePathCommand.Execute(path);
                    }
                }
            }

            // Try to get bitmap directly from drop
            var bitmap = e.DataTransfer.TryGetBitmap();
            if (bitmap != null)
            {
                try
                {
                    var tempDir = Path.Combine(Path.GetTempPath(), "Finder2eFoundryConverter");
                    if (!Directory.Exists(tempDir)) Directory.CreateDirectory(tempDir);

                    var tempPath = Path.Combine(tempDir, $"dropped_image_{DateTime.Now.Ticks}.png");
                    using (var stream = File.Create(tempPath))
                    {
                        bitmap.Save(stream);
                    }
                    vm.AddImagePathCommand.Execute(tempPath);
                }
                catch (Exception ex)
                {
                    vm.StatusMessage = $"Error saving dropped image: {ex.Message}";
                }
            }
        }

    }
}