using System.Collections;
using UnityEngine;

public class Pickup : MonoBehaviour
{
    private enum PickUpType
    {
        GoldCoin,
        StaminaGlobe,
        HealthGlobe,
    }

    [SerializeField] private PickUpType pickUpType;
    [SerializeField] private float pickUpDistance = 5f;
    [SerializeField] private float accelerationRate = .2f;
    [SerializeField] private float moveSpeed = 3f;
    [SerializeField] private AnimationCurve animCurve;
    [SerializeField] private float heightY = 1.5f;
    [SerializeField] private float popDuration = 1f;

    private Vector3 moveDir;
    private Rigidbody2D rb;

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    private void Start()
    {
        StartCoroutine(AnimCurveSpawnRoutine());
    }

    private void Update()
    {
        if (PlayerController.Instance != null)
        {
            Vector3 playerPos = PlayerController.Instance.transform.position;

            if (Vector3.Distance(transform.position, playerPos) < pickUpDistance)
            {
                moveDir = (playerPos - transform.position).normalized;
                moveSpeed += accelerationRate;
            }
            else
            {
                moveDir = Vector3.zero;
                moveSpeed = 0;
            }
        }
    }

    private void FixedUpdate()
    {
        rb.velocity = moveDir * moveSpeed * Time.deltaTime;
    }

    private void OnTriggerStay2D(Collider2D other)
    {
        if (other.gameObject.GetComponent<PlayerController>() != null)
        {
            DetectPickupType();
            Destroy(gameObject);
        }
    }

    private IEnumerator AnimCurveSpawnRoutine()
    {
        Vector2 startPoint = transform.position;
        float randomX = transform.position.x + Random.Range(-2f, 2f);
        float randomY = transform.position.y + Random.Range(-1f, 1f);
        Vector2 endPoint = new Vector2(randomX, randomY);
        float timePassed = 0f;

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

            transform.position = Vector2.Lerp(startPoint, endPoint, linearT) + new Vector2(0f, height);
            yield return null;
        }
    }

    private void DetectPickupType()
    {
        switch (pickUpType)
        {
            case PickUpType.GoldCoin:
                EconomyManager.Instance.UpdateCurrentGold();
                break;
            case PickUpType.HealthGlobe:
                if (PlayerHealth.Instance != null)
                {
                    PlayerHealth.Instance.HealPlayer();
                }
                break;
            case PickUpType.StaminaGlobe:
                Stamina.Instance.RefreshStamina();
                break;
        }
    }
}