using System.Collections.Generic;
using UnityEngine;

public enum E_HeroAIType
{
    None,
    NormalAuto,
    D2_LockMissionTarget,
    D3_BackToStartPos,
    D4_QLZF,
    D5_Hlyy,
    D6_RandomPoint,
    D7_ZMSL,
    KillUntilDie = 99,
}

public class HeroAIHandler
{
    private Dictionary<byte, HeroAI_Base> m_AIDict = null;
    public Dictionary<byte, HeroAI_Data> aiData = null;
    private List<byte> m_AIList = null;

    private HeroAI_Base m_Default = null;
    private HeroAI_Base m_Current = null;
    public E_HeroAIType currentType;

    public int PriorityNpcID;

    public HeroAIHandler()
    {
        m_AIList = new List<byte>();
        m_AIDict = new Dictionary<byte, HeroAI_Base>();
        aiData = new Dictionary<byte, HeroAI_Data>();

        m_AIList.Add((byte)E_HeroAIType.KillUntilDie);
        m_AIDict.Add((byte)E_HeroAIType.KillUntilDie,
                      new HeroAI_KillUntilDie());
        aiData.Add((byte)E_HeroAIType.KillUntilDie,
                    new KillUntilDieData());

        m_AIList.Add((byte)E_HeroAIType.NormalAuto);
        m_AIDict.Add((byte)E_HeroAIType.NormalAuto,
                      new HeroAI_NormalAuto());

        m_AIList.Add((byte)E_HeroAIType.D2_LockMissionTarget);
        m_AIDict.Add((byte)E_HeroAIType.D2_LockMissionTarget,
                      new HeroAI_D2_LockMissionTarget());

        m_AIList.Add((byte)E_HeroAIType.D3_BackToStartPos);
        m_AIDict.Add((byte)E_HeroAIType.D3_BackToStartPos,
                      new HeroAI_D3_BackToStartPos());

        m_AIList.Add((byte)E_HeroAIType.D4_QLZF);
        m_AIDict.Add((byte)E_HeroAIType.D4_QLZF,
                      new HeroAI_D4_Qlzf());

        m_AIList.Add((byte)E_HeroAIType.D5_Hlyy);
        m_AIDict.Add((byte)E_HeroAIType.D5_Hlyy,
                      new HeroAI_D5_Hlyy());

        m_AIList.Add((byte)E_HeroAIType.D6_RandomPoint);
        m_AIDict.Add((byte)E_HeroAIType.D6_RandomPoint,
                      new HeroAI_D6_NearestPoint());

        m_AIList.Add((byte)E_HeroAIType.D7_ZMSL);
        m_AIDict.Add((byte)E_HeroAIType.D7_ZMSL,
                      new HeroAI_D7_Hlyy());

        currentType = E_HeroAIType.None;
    }

    public void Update()
    {
        HeroAI_Base _chk = null;
        byte _aiType;

        if (m_Current != null)
        {
            // 当前状态更新
            m_Current.Update();

            // 如果当前状态结束
            if (!m_Current.IsOver())
            {
                return;
            }

            // 已经执行完毕, 退出状态
            m_Current.Exit();
            m_Current = null;
            currentType = E_HeroAIType.None;
        }

        // 遍历所有状态, 决定此次进入哪个状态
        for (int i = 0; i < m_AIList.Count; ++i)
        {
            _aiType = m_AIList[i];
            _chk = m_AIDict[_aiType];

            if (m_Current != _chk)
            {
                // 判断每个AI状态是否达到进入条件
                if (m_AIDict[_aiType].Condition())
                {
                    // 是否存在旧的状态
                    if (m_Current != null)
                    {
                        // 执行退出
                        m_Current.Exit();
                    }

                    // 设置当前状态
                    m_Current = m_AIDict[_aiType];
                    // 进入
                    m_Current.Enter();

                    break;
                }
            }
        }
    }

    public bool IsAuto()
    {
        return currentType >= E_HeroAIType.NormalAuto
            && currentType < E_HeroAIType.KillUntilDie;
    }

    public bool IsPause()
    {
        if (!IsAuto())
        {
            return false;
        }

        HeroAI_Auto _auto = m_Current as HeroAI_Auto;

        if (_auto == null
        || !_auto.IsPause())
        {
            return false;
        }

        return true;
    }

    public void Stop()
    {
        m_Current = null;
        currentType = E_HeroAIType.None;
    }
}