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;
using System.Text.Json.Nodes;
using System.Text.Json;
using finder2e_foundry_converter.Converters;

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]
        [NotifyPropertyChangedFor(nameof(IsNpcSelected))]
        private string? _selectedCategory;

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

        [ObservableProperty]
        private int _selectedLevel = 1;

        public ObservableCollection<int> Levels { get; } = new();

        [ObservableProperty]
        private string _name = string.Empty;

        [ObservableProperty]
        private string _description = string.Empty;

        public bool IsNpcSelected => SelectedCategory == "NPCs";

        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
            for (int i = -1; i <= 24; i++)
            {
                Levels.Add(i);
            }
            _ = 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
            }
        }

        [ObservableProperty]
        private string _generatedNpcJson = string.Empty;

        [ObservableProperty]
        private string _temporaryNpcPath = string.Empty;

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

            StatusMessage = "Generating NPC from template...";

            try
            {
                // Load template JSON
                var cwd = Directory.GetCurrentDirectory();
                var templatePath = Path.Combine(cwd, "foundry_templates", "npc_template.json");
                if (!File.Exists(templatePath))
                {
                    StatusMessage = $"Template not found at {templatePath}";
                    return;
                }

                var templateText = await File.ReadAllTextAsync(templatePath);
                var node = JsonNode.Parse(templateText)!.AsObject();

                // Fill basic fields
                node["name"] = string.IsNullOrWhiteSpace(Name) ? "NPC" : Name;
                node["img"] = node["img"] ?? "systems/pf2e/icons/default-icons/npc.svg";

                // system defaults
                var systemNode = node["system"] as JsonObject ?? new JsonObject();
                node["system"] = systemNode;

                // Set description/blurb and level
                if (!systemNode.TryGetPropertyValue("details", out var detailsNode) || detailsNode is null)
                {
                    detailsNode = new JsonObject();
                    systemNode["details"] = detailsNode;
                }
                var details = detailsNode.AsObject();
                details["blurb"] = Description ?? string.Empty;
                if (!details.TryGetPropertyValue("level", out var levelNode) || levelNode is null)
                {
                    details["level"] = new JsonObject();
                }
                details["level"].AsObject()["value"] = SelectedLevel;

                // Default to pf2e for now
                string gameSystem = "pf2e";

                // Compute numeric stats using NpcConverter helper functions with conservative tiers
                var abilityTier = "moderate";
                var perceptionTier = "moderate";
                var acTier = "moderate";
                var savingTier = "moderate";
                var hpTier = "moderate";

                var abilities = new JsonObject();
                string[] abilityNames = new[] { "str", "dex", "con", "int", "wis", "cha" };
                foreach (var ab in abilityNames)
                {
                    var modRes = NpcConverter.AbilityScoreModifier(SelectedLevel, abilityTier, gameSystem);
                    abilities[ab] = new JsonObject { ["mod"] = modRes.IsSuccess ? modRes.Value : 0 };
                }
                systemNode["abilities"] = abilities;

                // Perception
                var percRes = NpcConverter.PerceptionModifier(SelectedLevel, perceptionTier, gameSystem);
                systemNode["perception"] = new JsonObject { ["mod"] = percRes.IsSuccess ? percRes.Value : 0, ["details"] = string.Empty };

                // Saves
                var fort = NpcConverter.SavingThrow(SelectedLevel, savingTier, gameSystem);
                var reflex = NpcConverter.SavingThrow(SelectedLevel, savingTier, gameSystem);
                var will = NpcConverter.SavingThrow(SelectedLevel, savingTier, gameSystem);
                systemNode["saves"] = new JsonObject
                {
                    ["fortitude"] = new JsonObject { ["value"] = fort.IsSuccess ? fort.Value : 0, ["saveDetail"] = string.Empty },
                    ["reflex"] = new JsonObject { ["value"] = reflex.IsSuccess ? reflex.Value : 0, ["saveDetail"] = string.Empty },
                    ["will"] = new JsonObject { ["value"] = will.IsSuccess ? will.Value : 0, ["saveDetail"] = string.Empty }
                };

                // AC
                var acRes = NpcConverter.Ac(SelectedLevel, acTier, gameSystem);
                if (!systemNode.TryGetPropertyValue("attributes", out var attributesNode) || attributesNode is null)
                {
                    attributesNode = new JsonObject();
                    systemNode["attributes"] = attributesNode;
                }
                var attributes = attributesNode.AsObject();
                attributes["ac"] = new JsonObject { ["value"] = acRes.IsSuccess ? acRes.Value : 10, ["details"] = string.Empty };

                // HP
                var hpRes = NpcConverter.Hp(SelectedLevel, hpTier, gameSystem);
                attributes["hp"] = new JsonObject { ["value"] = hpRes.IsSuccess ? hpRes.Value : 10, ["temp"] = 0, ["max"] = hpRes.IsSuccess ? hpRes.Value : 10, ["details"] = string.Empty };

                // Skills (leave empty for now)
                systemNode["skills"] = new JsonObject();

                // Finalize JSON text
                GeneratedNpcJson = node.ToJsonString(new JsonSerializerOptions { WriteIndented = true });

                // Save to a temporary file while generating
                var tempDir = Path.Combine(Path.GetTempPath(), "Finder2eFoundryConverter");
                if (!Directory.Exists(tempDir)) Directory.CreateDirectory(tempDir);
                var safeName = string.IsNullOrWhiteSpace(Name) ? "npc" : string.Concat(Name.Select(ch => Path.GetInvalidFileNameChars().Contains(ch) ? '_' : ch));
                var tempPath = Path.Combine(tempDir, $"{safeName}_{DateTime.Now:yyyyMMddHHmmss}.json");
                await File.WriteAllTextAsync(tempPath, GeneratedNpcJson);
                TemporaryNpcPath = tempPath;

                StatusMessage = $"NPC generated and saved to temporary path: {tempPath}";
            }
            catch (Exception ex)
            {
                StatusMessage = $"Error generating NPC: {ex.Message}";
            }
        }

        [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);
            }
        }
    }
}