using System;
using System.Collections;
using System.Collections.Generic;
using KTGMGemClient;
using UnityEngine;
using TowerDefense.UI.HUD;

namespace TowerDefense.Level
{
    /// <summary>
    /// PVE 无尽模式一个关卡波次管理器
    /// </summary>
    public class EndlessWaveManager : MonoBehaviour
    {
        /// <summary>
        /// 当前关卡等级的所有波数据
        /// </summary>
        public List<List<EndlessPortConfig>> LevelData { get; set; }

        /// <summary>
        /// 波次时间间隔
        /// </summary>
        public float WaveInterval { get; set; }

        /// <summary>
        /// 怪物移速缩放
        /// </summary>
        public float SpeedScale { get; set; } = 1.0f;

        /// <summary>
        /// 当前波索引
        /// </summary>
        public int CurrentWaveIndex { get; protected set; }

        /// <summary>
        /// 当前波数据
        /// </summary>
        protected List<EndlessPortConfig> waveData;

        /// <summary>
        /// 实际上就是5条兵线
        /// </summary>
        [Tooltip("Specify list in order")]
        public List<EndlessWave> waves = new List<EndlessWave>();

        /// <summary>
        /// 当前WaveManager是否开始Wave.
        /// </summary>
        protected bool isWaveStarted = false;

        /// <summary>
        /// Called when all waves are finished
        /// </summary>
        public event Action AllWaveCompleted;

        /// <summary>
        /// 当前关卡的总波数
        /// </summary>
        public int TotalWaves { get; protected set; }

        /// <summary>
        /// 当前波的赛道总数
        /// </summary>
        public int TotalWaveLines { get; set; }

        /// <summary>
        /// 当前波已经完成的赛道数量
        /// </summary>
        public int CompletedWaveLine { get; protected set; }

        /// <summary>
        /// 本波次敌人总数量
        /// </summary>
        public int TotalEnemies { get; protected set; }

        /// <summary>
        /// 本波次剩余敌人数量
        /// </summary>
        public int RemainEnemies { get; protected set; }

        /// <summary>
        /// 当前正在进行的关卡等级
        /// </summary>
        public int Level { get; protected set; }

        /// <summary>
        /// Starts the waves
        /// </summary>
        /// <param name="level">关卡等级</param>
        /// 
        public virtual void StartWaves(int level)
        {
            Debug.Log($"--------------------- 开始第 {level} 关 ---------------------");
            Level = level;
            LevelData = EndlessPortData.GetLevelWaveData(level);
            TotalWaves = LevelData.Count;
            CurrentWaveIndex = 0;
            EndlessBossHPManager.instance.InitHP();
            EndlessLevelManager.instance.DecrementEnemies -= DecrementEnemies;
            EndlessLevelManager.instance.DecrementEnemies += DecrementEnemies;

            if (LevelData.Count == 0)
                throw new Exception($"当前关卡：{level}, 没有关卡数据");

            UpdateWave();
        }

        /// <summary>
        /// 敌人数量减少
        /// </summary>
        /// <param name="count"></param>
        public void DecrementEnemies(int count)
        {
            RemainEnemies -= count;
            // 改变血条的进度
            EndlessBossHPManager.instance.SetCurrentProgress(RemainEnemies * 1f / TotalEnemies);
        }

        /// <summary>
        /// 获取当前Wave的开始位置
        /// </summary>
        /// <param name="waveline"></param>
        /// <returns></returns>
        public Vector3 GetWaveEndPos(int waveline)
        {
            return waves[waveline].StartingNode.GetNextNode().transform.position;
        }

        /// <summary>
        /// 更新波
        /// </summary>
        private void UpdateWave()
        {
            if (EndlessGameUI.instance.state == EndlessGameUI.State.GameOver) return;

            if (CurrentWaveIndex > 0)
                EndlessBossHPManager.instance.SwitchHP(CurrentWaveIndex == TotalWaves -1);
            EndlessBossHPManager.instance.UpdateWave(TotalWaves - CurrentWaveIndex);
            EndlessBossHPManager.instance.ShowHP();
            TotalEnemies = EndlessPortData.GetWaveEnemiesCount(Level, CurrentWaveIndex);
            RemainEnemies = TotalEnemies;

            waveData = LevelData[CurrentWaveIndex];
            // 直接取第一条就行了
            WaveInterval = waveData[0].Config.cooldown / 1000f;
            TotalWaveLines = waveData.Count;
            CompletedWaveLine = 0;

            foreach (EndlessPortConfig data in waveData)
            {
                // 兵线被摧毁了，就不再出兵了，实际上只要不是Wait状态 都应该不能出兵
                if (waves[data.Config.tunel - 1].LineState == EndlessWaveLineState.Destroyed)
                {
                    --TotalWaveLines;
                    continue;
                }

                waves[data.Config.tunel - 1].WaveCompleted -= OneWaveCompleted;
                waves[data.Config.tunel - 1].WaveCompleted += OneWaveCompleted;
                waves[data.Config.tunel - 1].StartWave(data);
            }

            if (TotalWaveLines != 0)
                isWaveStarted = true;
        }

        /// <summary>
        /// 一波结束了
        /// </summary>
        private void OneWaveCompleted()
        {
            ++CompletedWaveLine;
        }

        public void Update()
        {
            if (!isWaveStarted) return;

            if (CompletedWaveLine >= TotalWaveLines)
            {
                // 判断所有敌人是否全部清除
                WaveLineAgentInsMgr[] waveLineAgentIns = AgentInsManager.instance.GetWaveLineList();

                // 判断是否敌人数量为0
                for (int i = 0; i < waveLineAgentIns.Length; ++i)
                {
                    if (waveLineAgentIns[i].getAgentInsNum() != 0)
                        return;
                }

                // 更新波索引
                ++CurrentWaveIndex;
                EndlessBuffManager.instance.UpdateBuffList();

                if (CurrentWaveIndex >= TotalWaves)
                    // 当前关卡的所有波次全部完成
                    SafelyCallSpawningCompleted();
                else
                {
                    isWaveStarted = false;
                    // 当前波的所有赛道都已经完成出怪
                    StartCoroutine(DelayToUpdateWave());
                }
            }
        }

        /// <summary>
        /// 延迟去更新新的一波
        /// </summary>
        /// <returns></returns>
        private IEnumerator DelayToUpdateWave()
        {
            yield return new WaitForSeconds(WaveInterval);
            UpdateWave();
        }

        /// <summary>
        /// Calls allWaveCompleted event
        /// </summary>
        protected virtual void SafelyCallSpawningCompleted()
        {
            isWaveStarted = false;
            EndlessBossHPManager.instance.UpdateWave(TotalWaves - CurrentWaveIndex);

            if (AllWaveCompleted != null)
                AllWaveCompleted();
        }
    }
}