using UnityEngine;
using System.Collections;
using UnityEngine.UI;
#if UNITY_EDITOR
using UnityEditor;
#endif

public class PlayerController : MonoBehaviour
{
    
    [Header("Keybinds")]
    public KeyCode forwardKey = KeyCode.W;
    public KeyCode backwardKey = KeyCode.S;
    public KeyCode leftKey = KeyCode.A;
    public KeyCode rightKey = KeyCode.D;
    public KeyCode dashKey = KeyCode.LeftShift;

    [Header("Speed")]
    public float speed = 5;
    public bool canMove = true;

    [Header("Dash")]
    public float dashSpeed = 10;
    public float dashDuration = 0.3f;  // Dash duration
    public float dashCooldown = 2f;
    public bool canDash = true;
    public ParticleSystem dashParticles;
    public Transform dashParticlesTransform;


    [Header("Lives")]
    public string enemyTag = "Enemy";
    public float invulnerabilityTime = 0.25f;
    public bool isInvulnerable = false;
    public int lives = 3;
    public ParticleSystem bloodParticles;
    public AudioSource damageSound;

    [Header("Player Object")]
    public Rigidbody rb;
    public BoxCollider collision;

    

    void Start()
    {
        if (!TryGetComponent(out rb))
        {
            Debug.LogError("Rigidbody not found!");
            enabled = false; // Disable script if Rigidbody is missing.
        }
        else
        {
            rb.freezeRotation = true;
        }
    }

    void FixedUpdate()
    {
        Vector3 moveDirection = GetPlayerDirection().normalized;

        if (Input.GetKey(dashKey) && canDash) 
        { 
            StartCoroutine(Dash());
        }
        else if (canMove)
        {
            rb.velocity = new Vector3(
                moveDirection.x * speed,
                rb.velocity.y,
                moveDirection.z * speed
            );
        }
    }

    IEnumerator Dash()
    {
        canMove = false;
        canDash = false;
        Vector3 dashDirection = GetPlayerDirection().normalized;
        rb.velocity = dashDirection * dashSpeed;

        dashParticles.Play();
        // Positions the dash particle system behind the player so that they
        // follow the player in a nice way
        dashParticlesTransform.SetLocalPositionAndRotation(dashDirection * -1.5f, dashParticlesTransform.localRotation);

        yield return new WaitForSeconds(dashDuration);

        dashParticles.Stop();

        rb.velocity = Vector3.zero;
        canMove = true;

        yield return new WaitForSeconds(dashCooldown);

        canDash = true;
    }

    Vector3 GetPlayerDirection()
    {
        float horizontal = 0f;
        float vertical = 0f;

        if (Input.GetKey(rightKey)) horizontal += 1f;
        if (Input.GetKey(leftKey)) horizontal -= 1f;
        if (Input.GetKey(forwardKey)) vertical += 1f;
        if (Input.GetKey(backwardKey)) vertical -= 1f;

        return new Vector3(horizontal, 0, vertical);
    }

    void OnCollisionEnter(Collision collision)
    {
        bool collidedWithEnemy = collision.gameObject.CompareTag(enemyTag);

        if (collidedWithEnemy && !isInvulnerable)
        {
            StartCoroutine(Hit());
        }
    }

    IEnumerator Hit()
    {
        lives--;
        if (lives <= 0)
        {
            ExitGame();
        }

        bloodParticles.Play();

        damageSound.Play();

        rb.isKinematic = true;
        isInvulnerable = true;

        yield return new WaitForSeconds(invulnerabilityTime / 2);

        rb.isKinematic = false;

        yield return new WaitForSeconds(invulnerabilityTime / 2);

        isInvulnerable = false;
    }

    void ExitGame()
    {
        #if UNITY_EDITOR
            EditorApplication.ExitPlaymode();
        #endif
        Application.Quit();
    }
}