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

public class PlayerControl : MonoBehaviour
{
    /// <summary>
    /// 最小速度
    /// </summary>
    public float minSpeed = 0.7f;
    /// <summary>
    /// 最大速度
    /// </summary>
    public float maxSpeed = 1.4f;
    /// <summary>
    /// 爆炸特效
    /// </summary>
    public GameObject explose;

    public float currentValue;
    public float maxValue = 100;

    public Slider armorSlider;
    public Text currentText;
    public Text maxText;

    private CameraFollow cf;

    /// <summary>
    /// 鼠标到飞船的距离
    /// </summary>
    private float dis = 0;
    /// <summary>
    /// 飞船的速度
    /// </summary>
    private float player_speed = 0;

    // Use this for initialization
    void Start()
    {
        currentValue = maxValue;
        UpdateContent();
        
        cf = GameObject.FindGameObjectWithTag("MainCamera").GetComponent<CameraFollow>();
    }

    // Update is called once per frame
    void Update()
    {
        Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        mousePos.z = 0;

        dis = Vector2.Distance(new Vector2(transform.position.x, transform.position.y), new Vector2(mousePos.x, mousePos.y));
        if (dis <= 0.1f)
        {

        }
        else
        {
            TurnTo(mousePos);

            player_speed = dis * 0.5f;
            player_speed = Mathf.Clamp(player_speed, minSpeed, maxSpeed);
            transform.Translate(Vector3.up * Time.deltaTime * player_speed);
        }
    }

    void TurnTo(Vector3 pos)
    {
        Vector3 dir = pos - transform.position;
        float theta = Mathf.Atan2(dir.y, dir.x);
        float angle = theta * Mathf.Rad2Deg;
        transform.localEulerAngles = new Vector3(0, 0, angle - 90);

    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "enemy")
        {
            
            Instantiate(explose, other.gameObject.transform.position, Quaternion.identity);
            cf.Shake();
            GetHurt(50);
            Destroy(other.gameObject);
        }
    }

    void GetHurt(int damage)
    {
        if (currentValue > 0)
        {
            currentValue -= damage;
            UpdateContent();
            if (currentValue <= 0)
            {
                Instantiate(explose, transform.position, Quaternion.identity);
                GameManage.Instance.GameOver();
            }
        }
    }

    void UpdateContent()
    {
        currentText.text = currentValue.ToString();
        maxText.text = "/" + maxValue.ToString();
        armorSlider.value = (currentValue / maxValue);
    }


}