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

public class GrapeProjectile : MonoBehaviour
{
    [SerializeField] private float duration = 1f;  // Duration of the projectile's flight
    [SerializeField] private AnimationCurve animCurve;  // Curve defining the projectile's arc
    [SerializeField] private float heightY = 3f;  // Maximum height of the projectile's arc
    [SerializeField] private GameObject grapeProjectileShadow;  // Shadow of the projectile
    [SerializeField] private GameObject splatterPrefab;  // Prefab to instantiate on impact

    private void Start() {
        // Instantiate and position the shadow below the projectile
        GameObject grapeShadow = 
        Instantiate(grapeProjectileShadow, transform.position + new Vector3(0, -0.3f, 0), Quaternion.identity);

        // Get the player's position and shadow's start position
        Vector3 playerPos = PlayerController.Instance.transform.position;
        Vector3 grapeShadowStartPosition = grapeShadow.transform.position;

        // Start the projectile's arc movement
        StartCoroutine(ProjectileCurveRoutine(transform.position, playerPos));
        // Start the shadow's movement
        StartCoroutine(MoveGrapeShadowRoutine(grapeShadow, grapeShadowStartPosition, playerPos));
    }

    // Controls the projectile's arc movement
    private IEnumerator ProjectileCurveRoutine(Vector3 startPosition, Vector3 endPosition) {
        float timePassed = 0f;

        while (timePassed < duration)
        {
            timePassed += Time.deltaTime;
            float linearT = timePassed / duration;
            float heightT = animCurve.Evaluate(linearT);
            float height = Mathf.Lerp(0f, heightY, heightT);

            // Update the projectile's position along the curve
            transform.position = Vector2.Lerp(startPosition, endPosition, linearT) + new Vector2(0f, height);

            yield return null;
        }
        // Spawn splatter effect on impact and destroy the projectile
        Instantiate(splatterPrefab, transform.position, Quaternion.identity);
        Destroy(gameObject);
    }

    // Controls the shadow's movement on the ground
    private IEnumerator MoveGrapeShadowRoutine(GameObject grapeShadow, Vector3 startPosition, Vector3 endPosition) {
        float timePassed = 0f;

        while (timePassed < duration) 
        {
            timePassed += Time.deltaTime;
            float linearT = timePassed / duration;
            grapeShadow.transform.position = Vector2.Lerp(startPosition, endPosition, linearT);
            yield return null;
        }

        // Destroy the shadow after the projectile lands
        Destroy(grapeShadow);
    }
}