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

public class MagicLaser : MonoBehaviour
{
    [SerializeField] private float laserGrowTime = 2f; // Duration for the laser to fully extend

    private bool isGrowing = true; // Tracks whether the laser is still growing
    private float laserRange; // The maximum length the laser can reach
    private SpriteRenderer spriteRenderer; // Reference to the SpriteRenderer component
    private CapsuleCollider2D capsuleCollider2D; // Reference to the CapsuleCollider2D component

    private void Awake() {
        spriteRenderer = GetComponent<SpriteRenderer>(); // Get the SpriteRenderer component attached to this GameObject
        capsuleCollider2D = GetComponent<CapsuleCollider2D>(); // Get the CapsuleCollider2D component attached to this GameObject
    }

    private void Start() {
        LaserFaceMouse(); // Rotate the laser to face the mouse cursor
    }

    private void OnTriggerEnter2D(Collider2D other) {
        // If the laser hits an indestructible object, stop its growth
        if (other.gameObject.GetComponent<Indestructible>() && !other.isTrigger) {
            isGrowing = false;
        }
    }

    public void UpdateLaserRange(float laserRange) {
        this.laserRange = laserRange; // Set the laser's maximum range
        StartCoroutine(IncreaseLaserLengthRoutine()); // Start extending the laser
    }

    private IEnumerator IncreaseLaserLengthRoutine() {
        float timePassed = 0f; // Tracks the elapsed time

        // Gradually extend the laser until it reaches its maximum range or is stopped
        while (spriteRenderer.size.x < laserRange && isGrowing)
        {
            timePassed += Time.deltaTime;
            float linearT = timePassed / laserGrowTime;

            // Adjust the size of the sprite to simulate the laser growing
            spriteRenderer.size = new Vector2(Mathf.Lerp(1f, laserRange, linearT), 1f);

            // Adjust the collider size and position as the laser grows
            capsuleCollider2D.size = new Vector2(Mathf.Lerp(1f, laserRange, linearT), capsuleCollider2D.size.y);
            capsuleCollider2D.offset = new Vector2((Mathf.Lerp(1f, laserRange, linearT)) / 2, capsuleCollider2D.offset.y);

            yield return null;
        }

        // After the laser stops growing, start fading out the laser's sprite
        StartCoroutine(GetComponent<SpriteFade>().SlowFadeRoutine());
    }

    private void LaserFaceMouse() {
        Vector3 mousePosition = Input.mousePosition; // Get the mouse position on the screen
        mousePosition = Camera.main.ScreenToWorldPoint(mousePosition); // Convert mouse position to world coordinates
        Vector2 direction = transform.position - mousePosition; // Calculate the direction from the laser to the mouse
        transform.right = -direction; // Rotate the laser to face the direction of the mouse
    }
}