using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Input;
using Avalonia.Media.Imaging;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using finder2e_foundry_converter.Models;
using finder2e_foundry_converter.Services;

namespace finder2e_foundry_converter.ViewModels
{
    public partial class MainWindowViewModel : ViewModelBase
    {
        private readonly LmStudioService _lmStudioService = new();
        private readonly OllamaService _ollamaService = new();

        private ILlmService CurrentService => SelectedProvider == "Ollama" ? (ILlmService)_ollamaService : _lmStudioService;

        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(CurrentAddress))]
        private string _lmStudioAddress = "http://localhost:1234";

        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(CurrentAddress))]
        private string _ollamaAddress = "http://localhost:11434";

        public string CurrentAddress
        {
            get => SelectedProvider == "Ollama" ? OllamaAddress : LmStudioAddress;
            set
            {
                if (SelectedProvider == "Ollama") OllamaAddress = value;
                else LmStudioAddress = value;
                OnPropertyChanged(nameof(CurrentAddress));
            }
        }

        [ObservableProperty]
        private bool _isAddressVisible = false;

        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(CurrentAddress))]
        private string _selectedProvider = "LM Studio";

        public ObservableCollection<string> Providers { get; } = new() { "LM Studio", "Ollama" };

        [ObservableProperty]
        private string? _selectedModel;

        public ObservableCollection<string> Models { get; } = new();

        [ObservableProperty]
        private string? _selectedCategory;

        public ObservableCollection<string> Categories { get; } = new() { "NPCs" };

        [ObservableProperty]
        private string _name = string.Empty;

        [ObservableProperty]
        private string _description = string.Empty;

        public ObservableCollection<ImageItem> ImageItems { get; } = new();

        [ObservableProperty]
        private string _statusMessage = string.Empty;

        [ObservableProperty]
        private bool _isErrorVisible = false;

        [ObservableProperty]
        private string _errorText = string.Empty;

        public MainWindowViewModel()
        {
            // Load saved preferences would go here if we had a settings service
            _ = StartModelRefreshLoop();
        }

        partial void OnSelectedProviderChanged(string value)
        {
            Models.Clear();
            SelectedModel = null;
            _ = RefreshModels();
        }

        [RelayCommand]
        private void ToggleAddress()
        {
            IsAddressVisible = !IsAddressVisible;
        }

        [RelayCommand]
        private async Task RefreshModels()
        {
            var models = await CurrentService.GetModelsAsync(CurrentAddress);

            Models.Clear();
            foreach (var m in models)
            {
                Models.Add(m);
            }

            if (models.Count > 0 && !models[0].StartsWith("Error"))
            {
                IsErrorVisible = false;
                if (SelectedModel == null || !Models.Contains(SelectedModel))
                {
                    SelectedModel = Models.FirstOrDefault();
                }
            }
            else
            {
                ErrorText = models.FirstOrDefault() ?? $"Error connecting to {SelectedProvider}";
                IsErrorVisible = true;
                IsAddressVisible = true; // Auto-show on failure
            }
        }

        [RelayCommand]
        private async Task Generate()
        {
            if (string.IsNullOrEmpty(SelectedModel))
            {
                StatusMessage = "Please select a model first.";
                return;
            }

            StatusMessage = "Generating...";
            var result = await CurrentService.GenerateResponseAsync(CurrentAddress, SelectedModel, Description, ImageItems.Select(i => i.Path).ToList());
            StatusMessage = result;
        }

        [RelayCommand]
        private void AddImagePath(string path)
        {
            if (!string.IsNullOrWhiteSpace(path) && File.Exists(path))
            {
                if (ImageItems.Any(i => i.Path == path)) return;

                try
                {
                    // Load thumbnail
                    using var stream = File.OpenRead(path);
                    var bitmap = new Bitmap(stream);
                    // We could resize it here for efficiency if needed, but for now let's just use it
                    ImageItems.Add(new ImageItem { Path = path, Thumbnail = bitmap });
                }
                catch (Exception ex)
                {
                    StatusMessage = $"Error loading image: {ex.Message}";
                }
            }
        }

        [RelayCommand]
        private void RemoveImage(ImageItem item)
        {
            ImageItems.Remove(item);
        }

        private async Task StartModelRefreshLoop()
        {
            while (true)
            {
                await RefreshModels();
                await Task.Delay(IsErrorVisible ? 3000 : 10000);
            }
        }
    }
}