using UnityEngine;
using System.Collections;

public class Controller3 : MonoBehaviour
{
    public Animator animator;
    bool death = false;
    public class GroundState
    {
        private GameObject player;
        private float width;
        private float height;

        //GroundState constructor.  Sets offsets for raycasting.
        public GroundState(GameObject playerRef)
        {
            player = playerRef;
            width = player.GetComponent<Collider2D>().bounds.extents.x;
            height = player.GetComponent<Collider2D>().bounds.extents.y;
            length = 0.05f;
        }

        //Returns whether or not player is touching wall.
        public bool isWall()
        {
            return Physics2D.OverlapArea(new Vector2(pos.x - width-0.1f, pos.y - height), new Vector2(pos.x - width-0.15f, pos.y + height), ContactFilter2D.NoFilter) ||
                    Physics2D.OverlapArea(new Vector2(pos.x + width+0.1f, pos.y - height), new Vector2(pos.x + width+0.15f, pos.y + height), ContactFilter2D.NoFilter);
        }

        //Returns whether or not player is touching ground.
        public bool isGround()
        {
            return Physics2D.OverlapArea(new Vector2(pos.x - width, pos.y - height-0.1f), new Vector2(pos.x + width, pos.y - height-0.15f), ContactFilter2D.NoFilter);
        }

        //Returns whether or not player is touching wall or ground.
        public bool isTouching()
        {
            if (isGround() || isWall())
                return true;
            else
                return false;
        }

        //Returns direction of wall.
        public int wallDirection()
        {
            Vector2 pos = player.GetComponent<Rigidbody>().position;
            bool left1 = Physics2D.Raycast(new Vector2(pos.x - width, pos.y), -Vector2.right, length);
            bool right1 = Physics2D.Raycast(new Vector2(pos.x + width, pos.y), Vector2.right, length);

            if (left1)
                return -1;
            else if (right1)
                return 1;
            else
                return 0;
        }
    }
    IEnumerator Delay()
    {
        powerJump = false;
        GetComponent<Animator>().Play("Player_Death", 0, 0f);
        death = true;
        gameObject.GetComponent<Rigidbody2D>().isKinematic = true;
        gameObject.GetComponent<Rigidbody2D>().constraints = RigidbodyConstraints2D.FreezePositionX | RigidbodyConstraints2D.FreezePositionY;
        GetComponent<Rigidbody2D>().velocity = new Vector2(0, 0);
        GetComponent<Rigidbody2D>().gravityScale = 0.0f;
        yield return new WaitForSeconds(0.5f);
        GameManager.instance.ResetLevel();
    }
    void OnTriggerEnter2D(Collider2D other)
    {
        //When touching the trap.
        if (other.CompareTag("Trap") && !death)
        {
            StartCoroutine(Delay());
        }
        //When touching the finish.
        else if (other.CompareTag("Finish"))
        {
            //Go to next level.
            GameManager.instance.IncreaseLevel();
        }
    }
    public float speed = 14f;
    public float accel = 6f;
    public float airAccel = 3f;
    public float jump = 14f;
    public float powerJumpStopBrakeMultiplier = 0.5f;

    private GroundState groundState;
    private bool powerJump;

    void Start()
    {
        //Create an object to check if player is grounded or touching wall
        groundState = new GroundState(transform.gameObject);
    }

    private Vector2 input;



    void Update()
    {
        if (death == true)
        {
            return;
        }

        //Handle input
        if (Input.GetKey(KeyCode.LeftArrow))
            input.x = -1;
        else if (Input.GetKey(KeyCode.RightArrow))
            input.x = 1;
        else
            input.x = 0;

        if (Input.GetButtonDown("Jump"))
            input.y = 1;

        //Stopped powerjumping
        if (powerJump && Input.GetButtonUp("Jump"))
        {
            powerJump = false;
            GetComponent<Rigidbody2D>().velocity = new Vector2(GetComponent<Rigidbody2D>().velocity.x, GetComponent<Rigidbody2D>().velocity.y * powerJumpStopBrakeMultiplier);
        }

        //Reverse player if going different direction
        transform.localEulerAngles = new Vector3(transform.localEulerAngles.x, (input.x == 0) ? transform.localEulerAngles.y : (input.x + 1) * 90, transform.localEulerAngles.z);
        //Check if run into obstacle.


    }

    void FixedUpdate()
    {
        if (death == true)
        {
            return;
        }

        if (powerJump && (groundState.isTouching() || GetComponent<Rigidbody2D>().velocity.y < 0))
        {
            powerJump = false;
        }

        if (input.y == 1 && groundState.isTouching())
            powerJump = true;

        GetComponent<Rigidbody2D>().AddForce(new Vector2(((input.x * speed) - GetComponent<Rigidbody2D>().velocity.x) * (groundState.isGround() ? accel : airAccel), 0)); //Move player.
                                                                                                                                                                          //Stop player if input.x is 0 (and grounded) and jump if input.y is 1
        GetComponent<Rigidbody2D>().velocity = new Vector2((input.x == 0 && groundState.isGround()) ? 0 : GetComponent<Rigidbody2D>().velocity.x, (input.y == 1 && groundState.isTouching()) ? jump : GetComponent<Rigidbody2D>().velocity.y);


        if (groundState.isWall() && !groundState.isGround() && input.y == 1)
            GetComponent<Rigidbody2D>().velocity = new Vector2(-groundState.wallDirection() * speed * 0.75f, GetComponent<Rigidbody2D>().velocity.y); //Add force negative to wall direction (with speed reduction)

        input.y = 0;

        animator.SetFloat("horizontal", Mathf.Abs(GetComponent<Rigidbody2D>().velocity.x));
        animator.SetFloat("vertical", GetComponent<Rigidbody2D>().velocity.y);
        animator.SetBool("grounded", groundState.isGround());
        animator.SetBool("walled", groundState.isWall());
        //animator.SetBool("dead", death);

    }
    //Enables being carried by moving objects tagged as "platform"
    void OnCollisionEnter2D(Collision2D col)
    {
        if (col.gameObject.CompareTag("Platform"))
            this.transform.parent = col.transform;
    }
    void OnCollisionExit2D(Collision2D col)
    {
        if (col.gameObject.CompareTag("Platform"))
            this.transform.parent = null;
    }
}