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

public class NewScaleZone : MonoBehaviour
{
    [Header("Scale Parts")]
    [SerializeField] private Transform _chainsOriginLeft;
    [SerializeField] private Transform _chainsOriginRight;
    [SerializeField] private Transform _beam;

    [Header("Zones")]
    [SerializeField] private Collider _leftZoneCollider;
    [SerializeField] private Collider _rightZoneCollider;

    [Header("Button")]
    [SerializeField] private Button _startButton;
    [SerializeField] private Sprite _spriteStart;
    [SerializeField] private Sprite _spriteInProgress;

    [Header("UI")]
    [SerializeField] private TMPro.TextMeshProUGUI _attemptText;

    [Header("Settings")]
    [SerializeField] private float _tiltSpeed = 1f;
    [SerializeField] private float _maxTiltAngle = 15f;
    [SerializeField] private float _maxChainOffset = 0.2f;
    [SerializeField] private float _showResultTime = 1.5f;

    private int _attempt = 1;
    private Vector3 _beamStartRot;
    private Vector3 _leftChainStartPos;
    private Vector3 _rightChainStartPos;
    private bool _isWeighing = false;
    public int Attempt => _attempt;

    private void Start()
    {
        _beamStartRot = _beam.localEulerAngles;
        _leftChainStartPos = _chainsOriginLeft.localPosition;
        _rightChainStartPos = _chainsOriginRight.localPosition;
        _startButton.onClick.AddListener(OnStartPressed);
        UpdateAttemptText();
    }

    private float GetMassInZone(Collider zone)
    {
        Collider[] colliders = Physics.OverlapBox(
            zone.bounds.center,
            zone.bounds.extents,
            Quaternion.identity
        );
        float total = 0f;
        foreach (var col in colliders)
        {
            if (col.gameObject == zone.gameObject) continue;
            Rigidbody rb = col.GetComponent<Rigidbody>();
            if (rb != null) total += rb.mass;
        }
        return total;
    }

    private void OnStartPressed()
    {
        if (_isWeighing) return;
        StartCoroutine(WeighRoutine());
    }

    private IEnumerator WeighRoutine()
    {
        _isWeighing = true;
        _startButton.image.sprite = _spriteInProgress;

        float leftMass = GetMassInZone(_leftZoneCollider);
        float rightMass = GetMassInZone(_rightZoneCollider);
        float diff = rightMass - leftMass;
        float normalized = Mathf.Clamp(diff / 2f, -1f, 1f);
        float targetAngle = -normalized * _maxTiltAngle;

        float elapsed = 0f;
        float duration = 1.5f;

        while (elapsed < duration)
        {
            elapsed += Time.deltaTime * _tiltSpeed;
            float t = Mathf.Clamp01(elapsed / duration);

            float angle = Mathf.Lerp(0f, targetAngle, t);
            _beam.localEulerAngles = new Vector3(
                _beamStartRot.x, _beamStartRot.y, _beamStartRot.z + angle);

            float offset = normalized * _maxChainOffset * t;
            _chainsOriginLeft.localPosition = new Vector3(
                _leftChainStartPos.x, _leftChainStartPos.y - offset, _leftChainStartPos.z);
            _chainsOriginRight.localPosition = new Vector3(
                _rightChainStartPos.x, _rightChainStartPos.y + offset, _rightChainStartPos.z);

            yield return null;
        }

        yield return new WaitForSeconds(_showResultTime);

        elapsed = 0f;
        while (elapsed < duration)
        {
            elapsed += Time.deltaTime * _tiltSpeed;
            float t = Mathf.Clamp01(elapsed / duration);

            float angle = Mathf.Lerp(targetAngle, 0f, t);
            _beam.localEulerAngles = new Vector3(
                _beamStartRot.x, _beamStartRot.y, _beamStartRot.z + angle);

            float offset = normalized * _maxChainOffset * (1f - t);
            _chainsOriginLeft.localPosition = new Vector3(
                _leftChainStartPos.x, _leftChainStartPos.y - offset, _leftChainStartPos.z);
            _chainsOriginRight.localPosition = new Vector3(
                _rightChainStartPos.x, _rightChainStartPos.y + offset, _rightChainStartPos.z);

            yield return null;
        }

        _beam.localEulerAngles = _beamStartRot;
        _chainsOriginLeft.localPosition = _leftChainStartPos;
        _chainsOriginRight.localPosition = _rightChainStartPos;

        WeighingManager manager = FindObjectOfType<WeighingManager>();
        if (manager != null) manager.ResetAllBalls();

        _attempt++;
        UpdateAttemptText();
        _startButton.image.sprite = _spriteStart;
        _isWeighing = false;
    }

    private void UpdateAttemptText()
    {
        if (_attemptText != null)
            _attemptText.text = "Спроба " + _attempt;
    }

    public void ShowSuccess()
    {
        int count = _attempt <= 1 ? 1 : _attempt - 1;
        if (_attemptText != null)
            _attemptText.text = "Пройдено з " + count + " спроб!";
    }

    public void RegisterAttempt()
    {
        if (_isWeighing) return;
        _attempt++;
        UpdateAttemptText();
    }

    public void RestartAttempts()
    {
        _attempt = 1;
        UpdateAttemptText();
    }
}