using System.Collections.Generic;
using Fantasy.Entitas;
using Fantasy.Entitas.Interface;
using Fantasy.Event;

namespace NBF
{
    /// <summary>
    /// 状态显示层组件
    /// </summary>
    public class PlayerStateViewComponent : Entity
    {
        private readonly Dictionary<PlayerState, PlayerStageViewBase> _stageViews =
            new Dictionary<PlayerState, PlayerStageViewBase>();

        private PlayerStageViewBase _currentStateView;
        private Player _player;

        public void Awake()
        {
            _player = GetParent<Player>();
            _stageViews.Add(PlayerState.Idle, new PlayerStageViewIdle());
            _stageViews.Add(PlayerState.Prepare, new PlayerStageViewPrepare());
            _stageViews.Add(PlayerState.Throw, new PlayerStageViewThrow());
            _stageViews.Add(PlayerState.Fishing, new PlayerStageViewFishing());
            _stageViews.Add(PlayerState.Fight, new PlayerStageViewFight());
            foreach (var playerStageView in _stageViews.Values)
            {
                playerStageView.Init(_player);
            }
        }

        public void Update()
        {
            _currentStateView?.Update();
        }

        public void OnStageChange()
        {
            if (_currentStateView != null)
            {
                _currentStateView.Exit();
            }

            _currentStateView = _stageViews.GetValueOrDefault(_player.State);
            _currentStateView.Enter(_player.StateParams, _player.PreviousState);
        }
    }

    public class PlayerStateViewComponentAwakeSystem : AwakeSystem<PlayerStateViewComponent>
    {
        protected override void Awake(PlayerStateViewComponent self)
        {
            self.Awake();
        }
    }

    public class PlayerStateViewComponentUpdateSystem : UpdateSystem<PlayerStateViewComponent>
    {
        protected override void Update(PlayerStateViewComponent self)
        {
            self.Update();
        }
    }

    public class OnPlayerStageChange : EventSystem<PlayerStateChangeEvent>
    {
        protected override void Handler(PlayerStateChangeEvent self)
        {
            var stateView = self.Player.GetComponent<PlayerStateViewComponent>();
            if (stateView != null)
            {
                stateView.OnStageChange();
            }
        }
    }
}