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

public class UAVehicle : BattleObject, IPowerOwner
{

	public const float MAX_ATTACK_RANGE = 10f;
	public const float MIN_FOLLOW_DISTANCE = 2f;

	private PowerManager powerManager;
	private Craft owner;
	private UAVItem uavItem;

	private float moveSpeed = 1f;

	public void Init (Map map, Craft owner, UAVItem uavItem)
	{
		this.map = map;

		this.owner = owner;
		this.userId = owner.userId;
		position = owner.position;

		map.AddUAVehicle (this);

		this.uavItem = uavItem;

		if (powerManager == null) {
			powerManager = new PowerManager (this, uavItem.GetData().attack, null, null);
		} else {
			powerManager.UpdatePower (uavItem.GetData().attack, null);
		}
	}

	public void Attack(Craft target)
	{
		if(target != null)
		{
			Power attack = GetPowerManager ().GetAttack ();
			if (target.team == owner.team) {
				if (TargetType.IsContainTarget (TargetType.ALLY, attack.targetType)) {
					this.target = target;
					return;
				}
			} else if (target.team != owner.team) {
				if (TargetType.IsContainTarget (TargetType.ENEMY, attack.targetType)) {
					this.target = target;
					return;
				}
			}
		}

		this.target = null;
	}


	public float GetDamage()
	{
		float value = uavItem.GetEquipment ().GetDmg ();
		if (value > 0)
			return value;

		value = uavItem.GetEquipment ().GetHp ();
		return value;
	}


	void Update()
	{
		if(IsDead())
		{
			return;
		}

		if(owner.IsDead())
		{
			Dead ();
			return;
		}

		if(target == null)
		{
			target = owner;
		}

		if (Vector3.Distance (target.position, this.position) > MIN_FOLLOW_DISTANCE) {
			this.position = Vector3.Lerp (this.position, owner.position, GameTime.deltaTime * moveSpeed);
		} else {
			if(CanAttack()){
				GetPowerManager ().AttempUserPower (GetPowerManager ().GetAttack ().GetId (), 
					Session.GetInstance ().GetBattleSession ().GetBattleController ());
			}
		}

		if(Vector3.Distance(owner.position, this.position) > MAX_ATTACK_RANGE)
		{
			target = owner;
		}

		Rotate ();
	}

	private bool CanAttack()
	{
		if (owner.IsCtrl () || (owner.userId < 0 && Session.GetInstance ().GetBattleSession ().GetBattleController ().IsAITaker ())) {
			Craft craft = target as Craft;
			Power attack = GetPowerManager ().GetAttack ();
			uint targetType = TargetType.NONE;
			if (craft.team == owner.team)
				targetType = TargetType.ALLY;
			else if (craft.team != owner.team)
				targetType = TargetType.ENEMY;
			if(TargetType.IsContainTarget(targetType, attack.targetType)){
				if(attack.GetPowerEffect() == Power.PowerEffect.Heal && craft.hp == craft.maxHp)
				{
					return false;
				}
				return true;
			}
		}
		return false;
	}

	private void Rotate()
	{
		if (target == null)
			return;

		Vector3 pos = target.position - this.position;
		pos.y = 0;

		if (pos.magnitude > 0) {
			Quaternion newRotation = Quaternion.LookRotation (pos);
			this.transform.rotation = newRotation;
		}
	}

	public PowerManager GetPowerManager()
	{
		return powerManager;
	}

	public void Teleport(int step)
	{
		
	}

	public override void Dead ()
	{
		if(_isDead)
			return;

		deadPos = position;
		_isDead = true;
		deadTime = GameTime.time;

		map.RemoveUAVehicle (this);

		Destroy (this.gameObject);
	}
}