using System;
using GameFramework.Event;
using GeometryTD.CustomEvent;
using GeometryTD.Entity.EntityData;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.Map
{
    public sealed class MapCombatRuntimeBridge
    {
        private Func<int, bool> _tryConsumeCoin;
        private Action<int> _addCoin;
        private bool _isCoinEventSubscribed;

        public int CurrentCoin { get; private set; }

        public void Initialize(MapEntityLoadContext loadContext, string mapName)
        {
            Reset();

            MapData mapData = loadContext?.InitialMapData;
            CurrentCoin = Mathf.Max(0, mapData != null ? mapData.InitialCoin : 0);
            _tryConsumeCoin = loadContext?.TryConsumeCoin;
            _addCoin = loadContext?.AddCoin;

            if (_tryConsumeCoin == null || _addCoin == null)
            {
                Log.Warning(
                    "Map combat runtime bridge has incomplete callbacks. Map='{0}', TryConsumeCoin={1}, AddCoin={2}.",
                    mapName,
                    _tryConsumeCoin != null,
                    _addCoin != null);
            }

            GameEntry.Event.Subscribe(CombatCoinChangedEventArgs.EventId, OnCombatCoinChanged);
            _isCoinEventSubscribed = true;
        }

        public void Reset()
        {
            if (_isCoinEventSubscribed)
            {
                GameEntry.Event.Unsubscribe(CombatCoinChangedEventArgs.EventId, OnCombatCoinChanged);
                _isCoinEventSubscribed = false;
            }

            _tryConsumeCoin = null;
            _addCoin = null;
            CurrentCoin = 0;
        }

        public bool TryConsumeCoin(int cost)
        {
            int requiredCoin = Mathf.Max(0, cost);
            if (requiredCoin <= 0)
            {
                return true;
            }

            return _tryConsumeCoin != null && _tryConsumeCoin.Invoke(requiredCoin);
        }

        public void AddCoin(int coin)
        {
            int amount = Mathf.Max(0, coin);
            if (amount <= 0)
            {
                return;
            }

            _addCoin?.Invoke(amount);
        }

        private void OnCombatCoinChanged(object sender, GameEventArgs e)
        {
            if (e is not CombatCoinChangedEventArgs args)
            {
                return;
            }

            CurrentCoin = Mathf.Max(0, args.CurrentCoin);
        }
    }
}