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

public class Projectile : MonoBehaviour
{
    [SerializeField] private float moveSpeed = 22f; // Speed at which the projectile moves
    [SerializeField] private GameObject particleOnHitPrefabVFX; // Visual effect to instantiate upon hitting a target
    [SerializeField] private bool isEnemyProjectile = false; // Flag to determine if this projectile belongs to an enemy
    [SerializeField] private float projectileRange = 10f; // Maximum distance the projectile can travel

    private Vector3 startPosition; // Initial position of the projectile

    private void Start() {
        startPosition = transform.position; // Store the starting position to calculate travel distance
    }

    private void Update()
    {
        MoveProjectile(); // Handle projectile movement
        DetectFireDistance(); // Check if the projectile has exceeded its range
    }

    // Updates the maximum range the projectile can travel
    public void UpdateProjectileRange(float projectileRange){
        this.projectileRange = projectileRange;
    }

    // Updates the speed at which the projectile moves
    public void UpdateMoveSpeed(float moveSpeed)
    {
        this.moveSpeed = moveSpeed;
    }

    // Handles collision detection and damage application to enemies or players
    private void OnTriggerEnter2D(Collider2D other) {
        EnemyHealth enemyHealth = other.gameObject.GetComponent<EnemyHealth>();
        Indestructible indestructible = other.gameObject.GetComponent<Indestructible>();
        PlayerHealth player = other.gameObject.GetComponent<PlayerHealth>();

        // Check if the projectile hits a valid target (enemy, indestructible object, or player)
        if (!other.isTrigger && (enemyHealth || indestructible || player)) {
            // Handle damage and effects if the projectile hits an appropriate target
            if ((player && isEnemyProjectile) || (enemyHealth && !isEnemyProjectile)) {
                player?.TakeDamage(1, transform); // Apply damage to the player
                Instantiate(particleOnHitPrefabVFX, transform.position, transform.rotation); // Spawn hit effect
                Destroy(gameObject); // Destroy the projectile
            } else if (!other.isTrigger && indestructible) {
                Instantiate(particleOnHitPrefabVFX, transform.position, transform.rotation); // Spawn hit effect on indestructible objects
                Destroy(gameObject); // Destroy the projectile
            }
        }
    }

    // Destroys the projectile if it exceeds its designated travel range
    private void DetectFireDistance() {
        if (Vector3.Distance(transform.position, startPosition) > projectileRange) {
            Destroy(gameObject);
        }
    }

    // Moves the projectile forward in the direction it is facing
    private void MoveProjectile()
    {
        transform.Translate(Vector3.right * Time.deltaTime * moveSpeed);
    }
}