using System.Collections;
using UnityEngine;

public class Pickup : MonoBehaviour
{
    // Enum to define the types of pickups available
    private enum PickUpType
    {
        GoldCoin,
        StaminaGlobe,
        HealthGlobe,
    }

    [SerializeField] private PickUpType pickUpType; // Type of pickup (e.g., GoldCoin, StaminaGlobe, etc.)
    [SerializeField] private float pickUpDistance = 5f; // Distance at which the pickup starts moving toward the player
    [SerializeField] private float accelerationRate = .2f; // Rate at which the pickup accelerates towards the player
    [SerializeField] private float moveSpeed = 3f; // Initial speed of the pickup's movement towards the player
    [SerializeField] private AnimationCurve animCurve; // Animation curve for the spawn animation
    [SerializeField] private float heightY = 1.5f; // Maximum height for the spawn animation
    [SerializeField] private float popDuration = 1f; // Duration of the spawn animation

    private Vector3 moveDir; // Direction in which the pickup moves towards the player
    private Rigidbody2D rb; // Rigidbody2D component for controlling physics

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>(); // Initialize the Rigidbody2D component
    }

    private void Start()
    {
        StartCoroutine(AnimCurveSpawnRoutine()); // Start the spawn animation using an animation curve
    }

    private void Update()
    {
        if (PlayerController.Instance != null)
        {
            Vector3 playerPos = PlayerController.Instance.transform.position; // Get the player's current position

            // If the player is within the pickup distance, move towards the player
            if (Vector3.Distance(transform.position, playerPos) < pickUpDistance)
            {
                moveDir = (playerPos - transform.position).normalized; // Calculate the direction towards the player
                moveSpeed += accelerationRate; // Increase the movement speed
            }
            else
            {
                moveDir = Vector3.zero; // Stop moving if the player is out of range
                moveSpeed = 0; // Reset the movement speed
            }
        }
    }

    private void FixedUpdate()
    {
        // Move the pickup in the calculated direction at the current speed
        rb.velocity = moveDir * moveSpeed * Time.deltaTime;
    }

    private void OnTriggerStay2D(Collider2D other)
    {
        // Check if the player is within the pickup's trigger area
        if (other.gameObject.GetComponent<PlayerController>() != null)
        {
            DetectPickupType(); // Determine the type of pickup and apply its effect
            Destroy(gameObject); // Destroy the pickup after it has been collected
        }
    }

    // Coroutine to animate the pickup's spawn using an animation curve
    private IEnumerator AnimCurveSpawnRoutine()
    {
        Vector2 startPoint = transform.position; // Initial position of the pickup
        float randomX = transform.position.x + Random.Range(-2f, 2f); // Random X position for the end point
        float randomY = transform.position.y + Random.Range(-1f, 1f); // Random Y position for the end point
        Vector2 endPoint = new Vector2(randomX, randomY); // Calculate the end point for the animation
        float timePassed = 0f;

        // Animate the pickup's position over time
        while (timePassed < popDuration)
        {
            timePassed += Time.deltaTime;
            float linearT = timePassed / popDuration; // Linear time progression
            float heightT = animCurve.Evaluate(linearT); // Evaluate the animation curve
            float height = Mathf.Lerp(0f, heightY, heightT); // Calculate the height based on the curve

            // Move the pickup along a path from the start to the end point with a height adjustment
            transform.position = Vector2.Lerp(startPoint, endPoint, linearT) + new Vector2(0f, height);
            yield return null;
        }
    }

    // Determine the type of pickup and apply the corresponding effect
    private void DetectPickupType()
    {
        switch (pickUpType)
        {
            case PickUpType.GoldCoin:
                EconomyManager.Instance.UpdateCurrentGold(); // Update the player's gold count
                break;
            case PickUpType.HealthGlobe:
                if (PlayerHealth.Instance != null)
                {
                    PlayerHealth.Instance.HealPlayer(); // Heal the player
                }
                break;
            case PickUpType.StaminaGlobe:
                Stamina.Instance.RefreshStamina(); // Refresh the player's stamina
                break;
        }
    }
}