using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SoldierUnit : WarUnit
{
    public bool HasAttackableTarget => AttackTarget.Count > 0 && AttackTarget[0] != null;

    [Header("State")]
    public string CurrentState;

    [Header("Targets")]
    public WarUnit MoveTarget;
    public WarUnit ShootTarget;
    public List<WarUnit> AttackTarget;

    private Rigidbody mBody;
    private CapsuleCollider mCollider;
    private FSM<SoldierUnit> mFSM;
    private AvatarGroup mAvatar;

    private bool mActive = false;

    private Vector3 mMovePos = Vector3.zero;
    [SerializeField]private Vector3 mVelocity = Vector3.zero;

    private HudHp mHpBar;

    protected override void AwakeInit()
    {
        AttackTarget = new List<WarUnit>();

        mBody = GetComponent<Rigidbody>();
        mCollider = GetComponent<CapsuleCollider>();
        mFSM = new FSM<SoldierUnit>(this);
        mAvatar = gameObject.AddComponent<AvatarGroup>();

        Freeze();
    }

    private void FixedUpdate()
    {
        if (!mActive)
            return;

        if (mFSM != null)
        {
            mFSM.Execute(Time.fixedDeltaTime);
            CurrentState = mFSM.CurrentState;
        }

        if (mBody != null)
        {
            mBody.velocity = mVelocity;
            mVelocity = Vector3.zero;
        }
    }

    public void Active()
    {
        mActive = true;
        mBody.isKinematic = false;
        mCollider.enabled = true;

        mFSM.ChangeState(typeof(SoldierStateRun));

        mHpBar = UIManager.Instance.GetUI<PanelGame>().CreateHudHp(mTrans, Utils.GetHpHOffset(BType, Level), Group == GroupType.Enemy, Utils.GetHpScale(BType, Level));
        mHpBar.gameObject.SetActive(false);
    }

    public void Freeze()
    {
        mActive = false;
        mBody.isKinematic = true;
        mCollider.enabled = false;
    }

    public void Win()
    {
        mFSM.ChangeState(typeof(SoldierStateWin));
    }

    public void SetACTrigger(SoldierACTrigger pTrigger, float pSpeed = 1)
    {
        mAvatar.SetACTrigger(pTrigger, pSpeed);
    }

    public void LookToTarget(Vector3 pTargetPos)
    {
        pTargetPos.y = mTrans.position.y;
        mTrans.LookAt(pTargetPos);
    }

    public void MoveToTarget(float pDeltaTime)
    {
        if (MoveTarget == null || MoveTarget.IsDead)
            return;

        Vector3 tMyPos = RelativePos();
        mMovePos = MoveTarget.RelativePos(tMyPos);
        MoveToPos(pDeltaTime);
    }

    public void MoveToPos(float pDeltaTime)
    {
        Vector3 tMyPos = RelativePos();
        LookToTarget(mMovePos);

        Vector3 tDir = mMovePos - tMyPos;
        tDir.y = 0;
        mVelocity = tDir.normalized * MoveSpeed * pDeltaTime;
    }

    public void StopMoving()
    {
        mVelocity = Vector3.zero;
    }

    protected override void HandleHurt(int pDamage)
    {
        mHpBar.gameObject.SetActive(true);
        mHpBar.RefreshHp((float)mCurHp / MaxHP);

        VibrateManager.Instance.Vibrate(VibrateType.Light);
    }

    protected override void HandleDie()
    {
        Freeze();
        mFSM.ChangeState(typeof(SoldierStateDead));
        mHpBar.gameObject.SetActive(false);

        Utils.DelayHideGameObject(gameObject, 3);
    }

    private void OnCollisionEnter(Collision pCollision)
    {
        GameObject tHitOb = pCollision.gameObject;
        WarUnit tUnit = tHitOb.GetComponent<WarUnit>();
        
        if (tUnit != null && Group != tUnit.Group && !AttackTarget.Contains(tUnit))
        {
            AttackTarget.Add(tUnit);
        }
    }

    private void OnCollisionExit(Collision pCollision)
    {
        GameObject tHitOb = pCollision.gameObject;
        WarUnit tUnit = tHitOb.GetComponent<WarUnit>();

        if (tUnit != null && Group != tUnit.Group && AttackTarget.Contains(tUnit))
        {
            AttackTarget.Remove(tUnit);
        }
    }
}