using UnityEngine;
using Unheimlich.Interactions.Core;
using Unheimlich.Data.CameraSettings;

namespace Unheimlich.Gameplay.Player
{
    /// <summary>
    /// Simulates camera head bobbing motion during player movement and idle states.
    /// </summary>
    public class CameraHeadBob : MonoBehaviour
{
    private float _timer = 0f;
    private Vector3 _startLocalPos;
    
    private HeadBobMode _overrideMode = HeadBobMode.Normal;
    private bool _hasOverride = false;
    private Coroutine _resetCoroutine;

    void Start()
    {
        _startLocalPos = transform.localPosition;
    }

    void Update()
    {
        if (PlayerController.Instance == null || PlayerController.Instance.CharController == null)
            return;

        var settings = PlayerController.Instance.CameraEffects?.Settings;
        if (settings == null) return;

        HeadBobMode currentMode = _hasOverride ? _overrideMode : HeadBobMode.Normal;
        
        if (currentMode == HeadBobMode.Disabled)
        {
            ResetPosition(settings.resetSpeed);
            return;
        }
        
        if (currentMode == HeadBobMode.Idle || (PlayerInspectionHandler.Instance != null && PlayerInspectionHandler.Instance.IsInspecting))
        {
            ApplyBob(settings.idleBobSpeed, settings.idleBobAmplitude);
            return;
        }
        
        bool isMoving = PlayerController.Instance.IsMoving;
        bool isRunning = PlayerController.Instance.IsRunning;
        bool isGrounded = PlayerController.Instance.CharController.isGrounded;

        if (isGrounded)
        {
            if (isMoving)
            {
                if (isRunning)
                    ApplyBob(settings.runBobSpeed, settings.runBobAmplitude);
                else
                    ApplyBob(settings.walkBobSpeed, settings.walkBobAmplitude);
            }
            else
                ApplyBob(settings.idleBobSpeed, settings.idleBobAmplitude);        
        }
        else
            ResetPosition(settings.resetSpeed);
    }
    
    public void SetMode(HeadBobMode mode)
    {
        _overrideMode = mode;
        _hasOverride = true;
    }
    
    public void ClearOverride()
    {
        _hasOverride = false;
        
        if (_resetCoroutine != null)
        {
            StopCoroutine(_resetCoroutine);
            _resetCoroutine = null;
        }
    }
    
    public void LerpToZero(float duration)
    {
        if (_resetCoroutine != null)
            StopCoroutine(_resetCoroutine);
        
        _resetCoroutine = StartCoroutine(LerpToZeroCoroutine(duration));
    }
    
    private System.Collections.IEnumerator LerpToZeroCoroutine(float duration)
    {
        Vector3 startPos = transform.localPosition;
        float elapsed = 0f;
        
        while (elapsed < duration)
        {
            elapsed += Time.deltaTime;
            float t = Mathf.Clamp01(elapsed / duration);
            transform.localPosition = Vector3.Lerp(startPos, Vector3.zero, t);
            yield return null;
        }
        
        transform.localPosition = Vector3.zero;
        _resetCoroutine = null;
    }

    private void ApplyBob(float speed, float amplitude)
    {
        _timer += Time.deltaTime * speed;
        
        float x = Mathf.Sin(_timer * 0.5f) * amplitude;        
        float y = Mathf.Cos(_timer) * amplitude; 

        Vector3 newPos = _startLocalPos;
        newPos.x += x;
        newPos.y += y;

        transform.localPosition = newPos;
    }

    private void ResetPosition(float resetSpeed)
    {
        transform.localPosition = Vector3.Lerp(transform.localPosition, _startLocalPos, Time.deltaTime * resetSpeed);
        
        if (Vector3.Distance(transform.localPosition, _startLocalPos) < 0.001f)
            _timer = 0f;
    }
}
}