using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Collections.Generic;
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 NpcGenerator? _npcGenerator;

        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]
        [NotifyPropertyChangedFor(nameof(CanGenerate))]
        private string? _selectedModel;
 
        public ObservableCollection<string> Models { get; } = new();
 
        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(IsNpcSelected))]
        [NotifyPropertyChangedFor(nameof(CanGenerate))]
        private string? _selectedCategory;

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

        [ObservableProperty]
        private int _selectedLevel = 1;

        public ObservableCollection<int> Levels { get; } = new();
 
        [ObservableProperty]
        private string _selectedSystem = "pf2e";

        public ObservableCollection<string> Systems { get; } = new() { "pf2e", "sf2e" };

        [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;

        [ObservableProperty]
        private bool _isGenerating = false;

        [ObservableProperty]
        private double _progress = 0.0;

        [ObservableProperty]
        private string _generatedNpcJson = string.Empty;

        [ObservableProperty]
        private string _temporaryNpcPath = 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();
        }

        public bool CanGenerate => !IsGenerating && !string.IsNullOrEmpty(SelectedModel);

        partial void OnIsGeneratingChanged(bool value)
        {
            OnPropertyChanged(nameof(CanGenerate));
        }
        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;
            }

            IsGenerating = true;
            Progress = 0.0;
            GeneratedNpcJson = string.Empty;
            StatusMessage = "Starting NPC generation...";

            try
            {
                // Initialize NpcGenerator
                if (_npcGenerator == null)
                {
                    _npcGenerator = new NpcGenerator(CurrentService);
                }

                // Load prompts from TOML
                Console.WriteLine("Loading prompts from npc.toml...");
                await _npcGenerator.LoadPromptsAsync();
                Progress = 0.05;

                // Handle name/description generation
                var name = Name ?? string.Empty;
                var description = Description ?? string.Empty;

                if (string.IsNullOrWhiteSpace(name) && string.IsNullOrWhiteSpace(description))
                {
                    // Generate both: name first, then description
                    StatusMessage = "Generating NPC name...";
                    name = await _npcGenerator.GenerateNameAsync(
                        CurrentAddress, SelectedModel!, description, SelectedLevel, 
                        ImageItems.Select(i => i.Path).ToList());
                    if (string.IsNullOrWhiteSpace(name)) name = "NPC";
                    Progress = 0.15;

                    StatusMessage = "Generating NPC description...";
                    description = await _npcGenerator.GenerateDescriptionAsync(
                        CurrentAddress, SelectedModel!, name, SelectedLevel,
                        ImageItems.Select(i => i.Path).ToList());
                    Progress = 0.25;
                }
                else if (string.IsNullOrWhiteSpace(name))
                {
                    // Generate name from description
                    StatusMessage = "Generating NPC name...";
                    name = await _npcGenerator.GenerateNameAsync(
                        CurrentAddress, SelectedModel!, description, SelectedLevel,
                        ImageItems.Select(i => i.Path).ToList());
                    if (string.IsNullOrWhiteSpace(name)) name = "NPC";
                    Progress = 0.15;
                }
                else if (string.IsNullOrWhiteSpace(description))
                {
                    // Generate description from name
                    StatusMessage = "Generating NPC description...";
                    description = await _npcGenerator.GenerateDescriptionAsync(
                        CurrentAddress, SelectedModel!, name, SelectedLevel,
                        ImageItems.Select(i => i.Path).ToList());
                    Progress = 0.25;
                }

                // Ask LLM for tiers per-stat
                var statKeys = new[] { "ability_score_modifier", "perception_modifier", "skill_modifier", "ac", "saving_throw", "hp", "resistance_or_weakness", "strike_attack_bonus", "strike_damage_roll" };
                var responses = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
                int total = statKeys.Length;
                int done = 0;

                foreach (var key in statKeys)
                {
                    try
                    {
                        StatusMessage = $"Asking LLM for {key}...";
                        var replacements = new Dictionary<string, string>
                        {
                            { "level", SelectedLevel.ToString() },
                            { "system", SelectedSystem ?? "pf2e" },
                            { "name", name },
                            { "description", description }
                        };

                        var (success, response) = await _npcGenerator.AskLlmAsync(
                            CurrentAddress, SelectedModel!, key, replacements,
                            ImageItems.Select(i => i.Path).ToList());

                        if (!success)
                        {
                            StatusMessage = $"LLM failed to provide valid response for {key} after 3 attempts.";
                            IsGenerating = false;
                            return;
                        }

                        responses[key] = response;
                        done++;
                        Progress = 0.25 + 0.65 * ((double)done / total);
                    }
                    catch (Exception ex)
                    {
                        StatusMessage = $"Error while asking for {key}: {ex.Message}";
                        IsGenerating = false;
                        return;
                    }
                }

                // Finished LLM prompts
                Progress = 0.95;

                // 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}";
                    IsGenerating = false;
                    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;
                details["publicNotes"] = description ?? string.Empty;
                if (!details.TryGetPropertyValue("level", out var levelNode) || levelNode is null)
                {
                    details["level"] = new JsonObject();
                    levelNode = details["level"];
                }
                levelNode!.AsObject()["value"] = SelectedLevel;

                string gameSystem = SelectedSystem ?? "pf2e";

                // Map tiers (normalize)
                string GetTier(string key)
                {
                    if (!responses.TryGetValue(key, out var r)) return "moderate";
                    var t = r.Trim().ToLowerInvariant();
                    if (t.StartsWith("extreme")) return "extreme";
                    if (t.StartsWith("high")) return "high";
                    if (t.StartsWith("moderate")) return "moderate";
                    if (t.StartsWith("low")) return "low";
                    if (t.StartsWith("terrible")) return "terrible";
                    if (t.StartsWith("yes")) return "yes";
                    if (t.StartsWith("no")) return "no";
                    return t;
                }

                var abilityTier = GetTier("ability_score_modifier");
                var perceptionTier = GetTier("perception_modifier");
                var skillTier = GetTier("skill_modifier");
                var acTier = GetTier("ac");
                var savingTier = GetTier("saving_throw");
                var hpTier = GetTier("hp");

                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
                var skillsNode = new JsonObject();
                var skillList = new[] { "acrobatics", "arcana", "athletics", "crafting", "deception", "diplomacy", "intimidation", "lore", "medicine", "nature", "occultism", "performance", "religion", "society", "stealth", "survival", "thievery" };
                foreach (var sk in skillList)
                {
                    var skRes = NpcConverter.SkillModifier(SelectedLevel, skillTier, gameSystem);
                    skillsNode[sk] = new JsonObject { ["value"] = skRes.IsSuccess ? skRes.Value : 0 };
                }
                systemNode["skills"] = skillsNode;

                // Items: create a basic Strike item
                var items = new JsonArray();
                var strikeTier = GetTier("strike_attack_bonus");
                var strikeAttack = NpcConverter.StrikeAttackBonus(SelectedLevel, strikeTier, gameSystem);
                var strikeDamage = NpcConverter.StrikeDamageRoll(SelectedLevel, strikeTier, gameSystem);
                var strikeAvgRes = NpcConverter.StrikeDamageAverage(SelectedLevel, strikeTier, gameSystem);

                if (strikeAttack.IsSuccess || strikeDamage.IsSuccess)
                {
                    var itemObj = new JsonObject
                    {
                        ["name"] = "Strike",
                        ["type"] = "weapon",
                        ["system"] = new JsonObject
                        {
                            ["attack"] = new JsonObject { ["value"] = strikeAttack.IsSuccess ? strikeAttack.Value : 0 },
                            ["damage"] = new JsonObject { ["dice"] = strikeDamage.IsSuccess ? strikeDamage.Value : string.Empty, ["average"] = strikeAvgRes.IsSuccess ? strikeAvgRes.Value : 0 }
                        }
                    };
                    items.Add(itemObj);
                }

                node["items"] = items;

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

                // Save to a temporary file
                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 successfully!";
                Progress = 1.0;
            }
            catch (Exception ex)
            {
                StatusMessage = $"Error generating NPC: {ex.Message}";
            }
            finally
            {
                IsGenerating = false;
            }
        }


        [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);
            }
        }
    }
}