using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Attach ke Button Senter di scene Menu AR.
/// Button otomatis muncul saat cahaya redup, hilang saat cahaya cukup.
/// User tetap klik sendiri untuk nyalain/matiin senter.
/// </summary>
public class FlashlightToggle : MonoBehaviour
{
    [Header("Button")]
    public GameObject buttonObject;  // assign ButtonSenter object
    public Image iconImage;
    public Sprite iconOn;
    public Sprite iconOff;

    [Header("Light Sensor Setting")]
    [Tooltip("Threshold cahaya (lux). Di bawah nilai ini button muncul. Agak redup = 100-200 lux")]
    public float lightThreshold = 150f;
    [Tooltip("Seberapa sering cek sensor cahaya (detik)")]
    public float checkInterval  = 0.5f;

    private bool  isOn          = false;
    private float lastCheckTime = 0f;

#if UNITY_ANDROID && !UNITY_EDITOR
    private AndroidJavaObject cameraManager;
    private string            cameraId;
    private AndroidJavaObject sensorManager;
    private AndroidJavaObject lightSensor;
    private LightSensorListener sensorListener;
#endif

    public float currentLux = 0f; // bisa dilihat di Inspector saat Play

    void Start()
    {
        Button btn = GetComponent<Button>();
        if (btn != null) btn.onClick.AddListener(Toggle);

        // Sembunyikan button di awal
        if (buttonObject != null) buttonObject.SetActive(false);

#if UNITY_ANDROID && !UNITY_EDITOR
        InitFlashlight();
        InitLightSensor();
#endif

        UpdateIcon();
    }

    void Update()
    {
        // Cek sensor setiap checkInterval detik
        if (Time.time - lastCheckTime < checkInterval) return;
        lastCheckTime = Time.time;

#if UNITY_ANDROID && !UNITY_EDITOR
        if (sensorListener != null)
        {
            currentLux = sensorListener.GetLux();
            UpdateButtonVisibility();
        }
#else
        // Di Editor, simulasi cahaya redup supaya button muncul
        currentLux = 50f;
        UpdateButtonVisibility();
#endif
    }

    void UpdateButtonVisibility()
    {
        if (buttonObject == null) return;

        bool shouldShow = currentLux < lightThreshold;

        // Kalau button disembunyikan saat senter nyala, matikan dulu
        if (!shouldShow && isOn)
        {
            isOn = false;
            SetFlashlight(false);
            UpdateIcon();
        }

        buttonObject.SetActive(shouldShow);
    }

    public void Toggle()
    {
        isOn = !isOn;
        SetFlashlight(isOn);
        UpdateIcon();
    }

    void SetFlashlight(bool on)
    {
#if UNITY_ANDROID && !UNITY_EDITOR
        try
        {
            if (cameraManager != null && cameraId != null)
                cameraManager.Call("setTorchMode", cameraId, on);
        }
        catch (System.Exception e)
        {
            Debug.LogError("[Flashlight] Error: " + e.Message);
        }
#else
        Debug.Log("[Flashlight] Senter " + (on ? "ON" : "OFF") + " (Editor)");
#endif
    }

    void UpdateIcon()
    {
        if (iconImage == null) return;
        if (iconOn != null && iconOff != null)
            iconImage.sprite = isOn ? iconOn : iconOff;
    }

#if UNITY_ANDROID && !UNITY_EDITOR
    void InitFlashlight()
    {
        try
        {
            AndroidJavaObject activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer")
                .GetStatic<AndroidJavaObject>("currentActivity");
            cameraManager = activity.Call<AndroidJavaObject>("getSystemService", "camera");
            string[] ids  = cameraManager.Call<string[]>("getCameraIdList");
            if (ids != null && ids.Length > 0) cameraId = ids[0];
        }
        catch (System.Exception e)
        {
            Debug.LogError("[Flashlight] Init error: " + e.Message);
        }
    }

    void InitLightSensor()
    {
        try
        {
            AndroidJavaObject activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer")
                .GetStatic<AndroidJavaObject>("currentActivity");
            sensorManager  = activity.Call<AndroidJavaObject>("getSystemService", "sensor");
            lightSensor    = sensorManager.Call<AndroidJavaObject>("getDefaultSensor", 5); // TYPE_LIGHT = 5
            sensorListener = new LightSensorListener();
            sensorManager.Call<bool>("registerListener", sensorListener, lightSensor, 3); // SENSOR_DELAY_NORMAL = 3
        }
        catch (System.Exception e)
        {
            Debug.LogError("[LightSensor] Init error: " + e.Message);
        }
    }
#endif

    void OnDestroy()
    {
        if (isOn) SetFlashlight(false);

#if UNITY_ANDROID && !UNITY_EDITOR
        try
        {
            if (sensorManager != null && sensorListener != null)
                sensorManager.Call("unregisterListener", sensorListener);
        }
        catch { }
#endif
    }

    void OnApplicationPause(bool pause)
    {
        if (pause && isOn) SetFlashlight(false);
    }
}

#if UNITY_ANDROID && !UNITY_EDITOR
/// <summary>
/// Listener sensor cahaya Android.
/// </summary>
public class LightSensorListener : AndroidJavaProxy
{
    private float lux = 999f; // default tinggi = terang

    public LightSensorListener() : base("android.hardware.SensorEventListener") { }

    public void onSensorChanged(AndroidJavaObject sensorEvent)
    {
        try
        {
            float[] values = sensorEvent.Get<float[]>("values");
            if (values != null && values.Length > 0)
                lux = values[0];
        }
        catch { }
    }

    public void onAccuracyChanged(AndroidJavaObject sensor, int accuracy) { }

    public float GetLux() => lux;
}
#endif