using UnityEngine;
using UnityEngine.SceneManagement;

public class Character : Unit
{
    [SerializeField]
    private float speed = 3.0F;

    [SerializeField]
    private int lives = 3;

    public int Lives
    {
        get { return lives; }
        set
        {
            if (value < 3) lives = value;
            livesBar.Refresh();
        }
    }
    private Lives livesBar;

    [SerializeField]
    private float jumpForce = 15.0F;

    [SerializeField]
    private int score = 0;

    [SerializeField]
    public AudioClip CoinSound;

    new private Rigidbody2D rigidbody;
    private Animator animator;
    private SpriteRenderer sprite;

    public bool canMove;
    public bool isGrounded = false;

    public Transform groundCheck;
    private float groundRadius = 0.2F;
    public LayerMask whatIsGround;

    private CharState State
    {
        get { return (CharState)animator.GetInteger("State"); }
        set { animator.SetInteger("State", (int)value); }
    }

    private void Awake()
    {
        livesBar = FindObjectOfType<Lives>();
        rigidbody = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();
        sprite = GetComponent<SpriteRenderer>();
    }

    private void FixedUpdate()
    {
        isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundRadius, whatIsGround);
        if (!isGrounded)
            return;
    }

    private void Update()
    {
        if (!canMove)
            return;

        State = CharState.idle;

        if (Input.GetButton("Horizontal")) Run();
        if (isGrounded && Input.GetButtonDown("Jump"))
            Jump();
        if (Input.GetButton("Fire1"))
            Attack();

        if (lives <= 0)
            SceneManager.LoadScene("level");
    }

    private void Run()
    {
        Vector3 direction = transform.right * Input.GetAxis("Horizontal");
        transform.position = Vector3.MoveTowards(transform.position, transform.position + direction, speed * Time.deltaTime);

        sprite.flipX = direction.x < 0.0F;
        State = CharState.walk;
    }

    private void Jump()
    {
        State = CharState.jump;
        rigidbody.AddForce(transform.up * jumpForce, ForceMode2D.Impulse);
    }

    private void Attack()
    {
        State = CharState.attack;
    }

    public override void ReceiveDamage()
    {
        if (State != CharState.attack)
            Lives--;
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "Finish")
            SceneManager.LoadScene("start_level");

        if (collision.transform.tag == "MovingPlatform")
        {
            transform.parent = collision.transform;
        }
    }

    void OnCollisionExit2D(Collision2D collision)
    {
        if (collision.transform.tag == "Ground")
        {
            transform.parent = collision.transform;
        }
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.tag == "Coin")
        {
            score++;
            AudioSource.PlayClipAtPoint(CoinSound, transform.position);
            Destroy(collision.gameObject);
        }

        if (collision.tag == "Gem")
        {
            score += 10;
            AudioSource.PlayClipAtPoint(CoinSound, transform.position);
            Destroy(collision.gameObject);
        }

        if (collision.tag == "DiePlace")
            Lives--;    }

    void OnGUI()
    {
        GUI.Box(new Rect(120, 0, 100, 30), "Score: " + score);
    }
}

public enum CharState
{
    idle,
    walk,
    jump,
    attack
}