using UnityEngine;
using System.Collections;

public class PlayerScript : MonoBehaviour
{
  /// <summary>
  /// 1 - The speed of the ship
  /// </summary>
  public Vector2 speed = new Vector2(50, 50);

  // 2 - Store the movement
  private Vector2 movement;

  void Update()
  {
    // 3 - Retrieve axis information
    float inputX = Input.GetAxis("Horizontal");
    float inputY = Input.GetAxis("Vertical");

    // 4 - Movement per direction
    movement = new Vector2(
      speed.x * inputX,
      speed.y * inputY);

         // 5 - Shooting
    bool shoot = Input.GetButtonDown("Fire1");
    shoot |= Input.GetButtonDown("Fire2");
    // Careful: For Mac users, ctrl + arrow is a bad idea

    if (shoot)
    {
      WeaponScript weapon = GetComponent<WeaponScript>();
      if (weapon != null)
      {
        // false because the player is not an enemy
        weapon.Attack(false);
      }
    }
    // 6 - Make sure we are not outside the camera bounds
    var dist = (transform.position - Camera.main.transform.position).z;

    var leftBorder = Camera.main.ViewportToWorldPoint(
      new Vector3(0, 0, dist)
    ).x;

    var rightBorder = Camera.main.ViewportToWorldPoint(
      new Vector3(1, 0, dist)
    ).x;

    var topBorder = Camera.main.ViewportToWorldPoint(
      new Vector3(0, 0, dist)
    ).y;

    var bottomBorder = Camera.main.ViewportToWorldPoint(
      new Vector3(0, 1, dist)
    ).y;

    transform.position = new Vector3(
      Mathf.Clamp(transform.position.x, leftBorder, rightBorder),
      Mathf.Clamp(transform.position.y, topBorder, bottomBorder),
      transform.position.z
    );

    // End of the update method
  }


  void FixedUpdate()
  {
    // 5 - Move the game object
    rigidbody2D.velocity = movement;
  }

  void OnCollisionEnter2D(Collision2D collision)
  {
    bool damagePlayer = false;

    // Collision with enemy
    EnemyScript enemy = collision.gameObject.GetComponent<EnemyScript>();
    if (enemy != null)
    {
      // Kill the enemy
      HealthScript enemyHealth = enemy.GetComponent<HealthScript>();
      if (enemyHealth != null) enemyHealth.Damage(enemyHealth.hp);

      damagePlayer = true;
    }

    // Damage the player
    if (damagePlayer)
    {
      HealthScript playerHealth = this.GetComponent<HealthScript>();
      if (playerHealth != null) playerHealth.Damage(1);
    }
  }
}