using System.Collections.Generic;
using UnityEngine;

public class BasketController : MonoBehaviour
{
    public ScoreManager scoreManager;
    [SerializeField] private Transform basketHoldPoint;
    [SerializeField] private LayerMask trickDetectMask = ~0;
    [SerializeField] private float basketSpawnInterval = 3f;
    private readonly Collider2D[] overlapHits = new Collider2D[8];
    private BoxCollider2D basketCollider;
    private TrickController currentTrick;
    private float nextBasketSpawnTime;

    private void Awake()
    {
        basketCollider = GetComponent<BoxCollider2D>();
    }

    private void FixedUpdate()
    {
        RefreshTricksInBasket();
        TryBasketSpawn();
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        Debug.Log("2D Solid hit with: " + collision.gameObject.name);

        if (collision.gameObject.CompareTag("Interactable"))
        {
            if (collision.gameObject.GetComponent<TrickController>() != null)
            {
                RegisterTrick(collision.gameObject);
                return;
            }

            RefreshTricksInBasket();
        if (currentTrick != null)
        {
            return;
        }

            scoreManager.AddPoints(1);

            GameObject.Destroy(collision.gameObject);
        }
    }

    private void OnCollisionExit2D(Collision2D collision)
    {
        UnregisterTrick(collision.gameObject);
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (!other.CompareTag("Interactable"))
        {
            return;
        }

        if (other.GetComponent<TrickController>() != null)
        {
            RegisterTrick(other.gameObject);
        }
    }

    private void OnTriggerExit2D(Collider2D other)
    {
        UnregisterTrick(other.gameObject);
    }

    private void RegisterTrick(GameObject obj)
    {
        if (obj.TryGetComponent<TrickController>(out var trick))
        {
            if (currentTrick != null && currentTrick != trick)
            {
                return;
            }

            currentTrick = trick;
            trick.SetBasketed(true, GetBasketAnchorPosition(trick));
            nextBasketSpawnTime = Time.time + basketSpawnInterval;
        }
    }

    private void UnregisterTrick(GameObject obj)
    {
        if (obj == null)
        {
            return;
        }

        if (obj.TryGetComponent<TrickController>(out var trick))
        {
            if (currentTrick == trick)
            {
                currentTrick = null;
                trick.SetBasketed(false);
                nextBasketSpawnTime = 0f;
            }
        }
    }

    private void RefreshTricksInBasket()
    {
        if (basketCollider == null)
        {
            return;
        }

        var filter = new ContactFilter2D();
        filter.SetLayerMask(trickDetectMask);
        filter.useTriggers = true;

        var hitCount = basketCollider.Overlap(filter, overlapHits);
        for (var i = 0; i < hitCount; i++)
        {
            var hit = overlapHits[i];
            if (hit == null || !hit.CompareTag("Interactable"))
            {
                continue;
            }

            if (hit.TryGetComponent<TrickController>(out var trick))
            {
                if (currentTrick == null)
                {
                    currentTrick = trick;
                    trick.SetBasketed(true, GetBasketAnchorPosition(trick));
                    nextBasketSpawnTime = Time.time + basketSpawnInterval;
                }

                break;
            }
        }

        if (currentTrick == null)
        {
            return;
        }

        if (currentTrick.IsCarried)
        {
            currentTrick.SetBasketed(false);
            currentTrick = null;
            nextBasketSpawnTime = 0f;
            return;
        }

        var stillInside = false;
        for (var i = 0; i < hitCount; i++)
        {
            var hit = overlapHits[i];
            if (hit == null || !hit.CompareTag("Interactable"))
            {
                continue;
            }

            if (hit.TryGetComponent<TrickController>(out var trick) && trick == currentTrick)
            {
                stillInside = true;
                break;
            }
        }

        if (!stillInside)
        {
            currentTrick.SetBasketed(false);
            currentTrick = null;
            nextBasketSpawnTime = 0f;
        }
    }

    private void TryBasketSpawn()
    {
        if (currentTrick == null || basketSpawnInterval <= 0f)
        {
            return;
        }

        if (Time.time < nextBasketSpawnTime)
        {
            return;
        }

        TrickController.TrySpawnAt(currentTrick.transform.position);
        nextBasketSpawnTime = Time.time + basketSpawnInterval;
    }

    private Vector2? GetBasketAnchorPosition(TrickController trick)
    {
        if (basketHoldPoint != null)
        {
            return OffsetForTrickHeight(basketHoldPoint.position, trick);
        }

        if (basketCollider != null)
        {
            return OffsetForTrickHeight(basketCollider.bounds.center, trick);
        }

        return null;
    }

    private Vector2 OffsetForTrickHeight(Vector2 anchor, TrickController trick)
    {
        if (trick == null)
        {
            return anchor;
        }

        var renderer = trick.GetComponent<SpriteRenderer>();
        if (renderer == null)
        {
            return anchor;
        }

        anchor.y += renderer.bounds.size.y * 0.5f;
        return anchor;
    }
}