using System;
using System.Collections.Generic;
using YachtDice.Dice;

namespace YachtDice.Player
{
    public class DiceCollection
    {
        private readonly List<DiceDefinition> _ownedDice = new();

        public event Action OnChanged;

        public IReadOnlyList<DiceDefinition> OwnedDice => _ownedDice;

        public void Add(DiceDefinition definition)
        {
            if (definition == null) return;
            if (OwnsById(definition.Id)) return;

            _ownedDice.Add(definition);
            OnChanged?.Invoke();
        }

        public void Remove(DiceDefinition definition)
        {
            if (_ownedDice.Remove(definition))
                OnChanged?.Invoke();
        }

        public bool OwnsById(string id)
        {
            for (int i = 0; i < _ownedDice.Count; i++)
            {
                if (_ownedDice[i] != null && _ownedDice[i].Id == id)
                    return true;
            }
            return false;
        }

        public List<string> GetSaveData()
        {
            var ids = new List<string>();
            for (int i = 0; i < _ownedDice.Count; i++)
                ids.Add(_ownedDice[i].Id);
            return ids;
        }

        public void LoadSaveData(List<string> diceIds, DiceCatalog catalog)
        {
            _ownedDice.Clear();

            if (diceIds == null)
            {
                OnChanged?.Invoke();
                return;
            }

            for (int i = 0; i < diceIds.Count; i++)
            {
                var def = catalog.FindById(diceIds[i]);
                if (def != null)
                    _ownedDice.Add(def);
            }

            OnChanged?.Invoke();
        }

        public void Clear()
        {
            _ownedDice.Clear();
            OnChanged?.Invoke();
        }
    }
}