using Cysharp.Threading.Tasks;
using Gameplay.Character;
using Gameplay.Common;

namespace Gameplay.Level
{
    public partial class Level
    {
        const int INVALID_STAGE_INDEX = -1;

        public int currentStageIndex { get; private set; } = INVALID_STAGE_INDEX;

        public LevelData.Stage CurrentStage =>
            CheckStageIndex(currentStageIndex) ? _levelData.stages[currentStageIndex] : null;

        public void InitRules()
        {
            currentStageIndex = INVALID_STAGE_INDEX;
            InitStarConditions();
            EnterNextStage();
        }

        public void ReleaseRules()
        {
            ReleaseStarConditions();
            ExitStage();
        }

        public void EnterNextStage()
        {
            var nextStageIndex = currentStageIndex + 1;
            EnterStage(nextStageIndex);
        }

        public void EnterStage(int stageIndex)
        {
            if (!CheckStageIndex(stageIndex))
                return;
            if (currentStageIndex != INVALID_STAGE_INDEX)
            {
                ExitStage();
            }

            currentStageIndex = stageIndex;
            InitStageConditions();
        }

        public void ExitStage()
        {
            if (CheckStageIndex(currentStageIndex))
            {
                currentStageIndex = INVALID_STAGE_INDEX;
                ReleaseStageConditions();
            }
        }

        public async void TryExitLevel(bool isSuccess)
        {
            await ChangeStateNextFrame(new EndState(this));
            LevelManager.Instance.TryExitLevel(isSuccess);
            DebugUtil.LogY($"exit level,result:{isSuccess}");
        }
        
        private void OnStageSuccess()
        {
            if (IsAllStageFinished())
            {
                TryExitLevel(true);
            }
            else
            {
                EnterNextStage();
            }
        }

        private void OnStageFailed()
        {
            TryExitLevel(false);
        }

        private bool CheckStageIndex(int index)
        {
            return index > INVALID_STAGE_INDEX && index < _levelData.stages.Count;
        }

        public static bool IsEnemy(GameUnit character1, GameUnit character2)
        {
            return IsEnemy(character1.commonData.troopId, character2.commonData.troopId);
        }

        public static bool IsEnemy(int troop1, int troop2)
        {
            return troop1 != troop2;
        }

        public bool IsAllDead(int troopId)
        {
            return _characterManager.FindOne(c => c.troopId == troopId && !c.statusData.isDead) == null;
        }
        
        private bool IsAllStageFinished()
        {
            return currentStageIndex >= _levelData.stages.Count - 1;
        }
        
        private async UniTask ChangeStateNextFrame(LevelBaseState state)
        {
            await UniTask.NextFrame();
            _stateMachine.ChangeState(state);
        }
    }
}