using System;
using System.Collections.Generic;
using System.Linq;
using Cysharp.Threading.Tasks;
using Gameplay.Character;
using Gameplay.Common;
using Gameplay.Unit;
using Gameplay.Unit.Data;

namespace Gameplay.Level
{
    public partial class Level
    {
        const int INVALID_STAGE_INDEX = -1;
        private const int STAR_TARGET_COUNT = 3;

        private readonly bool[] _starTargets = new bool[3];

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

        public int StarCount => _starTargets.Count(isSuccess => isSuccess);

        //index数组，如完成了1，3星级条件，则返回[1,3]
        public List<uint> StarResult
        {
            get
            {
                var result = new List<uint>();
                for (int i = 0; i < _starTargets.Length; i++)
                {
                    if(_starTargets[i])
                        result.Add((uint)i+1);
                }

                return result;
            }
        }
        
        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)
        {
            // TODO: 临时处理，后续需要修改
            SetPause(true);

            await ChangeStateNextFrame(new EndState(this));
            if (!IsPvPLevel)
                LevelManager.Instance.TryExitLevel(isSuccess);
            else
            {
                PVPManager.Instance.FinishPVPFight(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)
        // {
        //     var allInfightUnits = GameUnitManager.instance.infightUnits;
        //     for (int i = 0; i < allInfightUnits.count; i++)
        //     {
        //         var unit = allInfightUnits.GetByIndex(i);
        //         if (unit.commonData.troopId != troopId)
        //         {
        //             continue;
        //         }
        //
        //         if (unit.gameunitType == EGameUnitType.Character)
        //         {
        //             return false;
        //         }
        //
        //         if (unit.gameunitType == EGameUnitType.Vehicle)
        //         {
        //             if (!unit.statusData.isDead)
        //             {
        //                 return false;
        //             }
        //         }
        //     }
        //
        //     return true;
        // }

        public int GetFactionCount(cfg.CharacterCfg.Efaction faction, int troopId)
        {
            return GameUnitManager.instance.characterManager.FindAll(c =>
                c.troopId == troopId && c.runtimeData.configData.faction == faction).Count;
        }

        public int GetJobCount(cfg.CharacterCfg.Ejob job, int troopId)
        {
            return GameUnitManager.instance.characterManager.FindAll(c =>
                c.troopId == troopId && c.runtimeData.configData.job == job).Count;
        }

        public int GetRarityCount(int rarity, int troopId)
        {
            return GameUnitManager.instance.characterManager.FindAll(c =>
                c.troopId == troopId && (int)c.runtimeData.configData.rarity == rarity).Count;
        }

        public string GetCurrStageSuccessConditionDesc()
        {
            if (CheckStageIndex(currentStageIndex))
            {
                return CurrentStage.successCondition.GetConditionLocalization();
            }

            return null;
        }

        public bool GetStarIsSuccess(int index)
        {
            return _starTargets[index];
        }

        public string GetStarTargetLocalization(int index)
        {
            return _levelData.starTarget[index].GetConditionLocalization();
        }

        private bool IsAllStageFinished()
        {
            return currentStageIndex >= _levelData.stages.Count - 1;
        }

        private async UniTask ChangeStateNextFrame(LevelBaseState state)
        {
            await UniTask.NextFrame();
            _stateMachine.ChangeState(state);
        }
    }
}