// Player.cs - Complete working version
using Godot;
using System;
using System.Collections.Generic;

namespace TextRPG.PlayerSystem
{
    public partial class Player : Node
    {
        // ---------- Singleton Pattern ----------
        private static Player _instance;
        public static Player Instance => _instance;

        // ---------- Signals ----------
        [Signal]
        public delegate void HealthChangedEventHandler(int currentHealth, int maxHealth);
        [Signal]
        public delegate void PlayerDiedEventHandler();
        [Signal]
        public delegate void InventoryChangedEventHandler();

        // ---------- Attributes ----------
        public int MaxHealth { get; set; } = 100;
        private int _currentHealth;
        public int CurrentHealth
        {
            get => _currentHealth;
            set
            {
                int newHealth = Math.Clamp(value, 0, MaxHealth);
                if (_currentHealth != newHealth)
                {
                    _currentHealth = newHealth;
                    EmitSignal(SignalName.HealthChanged, _currentHealth, MaxHealth);
                    if (_currentHealth <= 0)
                        EmitSignal(SignalName.PlayerDied);
                }
            }
        }

        public int Strength { get; set; } = 10;
        public int Dexterity { get; set; } = 10;
        public int Intelligence { get; set; } = 10;

        // ---------- Inventory ----------
        public List<Item> Inventory { get; private set; } = new List<Item>();

        // ---------- Lifecycle ----------
        public override void _EnterTree()
        {
            if (_instance != null)
            {
                GD.Print("Duplicate Player instance detected. Removing.");
                QueueFree();
            }
            else
            {
                _instance = this;
                GD.Print("Player singleton initialized.");
            }
        }

        public override void _Ready()
        {
            _currentHealth = MaxHealth;
        }

        // ---------- Public Methods ----------
        public void TakeDamage(int amount)
        {
            CurrentHealth -= amount;
        }

        public void Heal(int amount)
        {
            CurrentHealth += amount;
        }

        public void AddItem(Item item)
        {
            Inventory.Add(item);
            EmitSignal(SignalName.InventoryChanged);
        }

        public bool RemoveItem(Item item)
        {
            bool removed = Inventory.Remove(item);
            if (removed)
                EmitSignal(SignalName.InventoryChanged);
            return removed;
        }

        public bool HasItem(string itemName)
        {
            return Inventory.Exists(i => i.Name.Equals(itemName, StringComparison.OrdinalIgnoreCase));
        }

        public Item GetItem(string itemName)
        {
            return Inventory.Find(i => i.Name.Equals(itemName, StringComparison.OrdinalIgnoreCase));
        }

        public string GetStatusString()
        {
            return $"Health: {CurrentHealth}/{MaxHealth}\n" +
                   $"Strength: {Strength}  Dexterity: {Dexterity}  Intelligence: {Intelligence}\n" +
                   $"Inventory: {Inventory.Count} items";
        }

        public string GetInventoryString()
        {
            if (Inventory.Count == 0)
                return "Your inventory is empty.";
            
            var lines = new List<string> { "=== Inventory ===" };
            foreach (var item in Inventory)
                lines.Add($"- {item.Name}: {item.Description}");
            return string.Join("\n", lines);
        }
    }
}