app/src/main/java/com/fairphone/moduledetect/ModuleDetectUtils.java

package com.fairphone.moduledetect;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

import androidx.annotation.NonNull;

public class ModuleDetectUtils {

    private static final String TAG = "ModuleDetect";

    /**
     * Action to handle a change of camera(s).
     */
    private static final String ACTION_HANDLE_CAMERA_CHANGED =
            "com.fairphone.moduledetect.ACTION_HANDLE_CAMERA_CHANGED";

    private static final String ACTION_HANDLE_RECEIVER_MODULE_CHANGED =
            "com.fairphone.psensor.receivers.ACTION_HANDLE_RECEIVER_MODULE_CHANGED";

    private static final String EXTRA_FRONT_CAMERA_CHANGED =
            "com.fairphone.moduledetect.EXTRA_FRONT_CAMERA_CHANGED";

    private static final String EXTRA_REAR_CAMERA_CHANGED =
            "com.fairphone.moduledetect.EXTRA_REAR_CAMERA_CHANGED";

    private static final String PERMISSION_CALIBRATE_PROXIMITY_SENSOR =
            "com.fairphone.psensor.permission.CALIBRATE_PROXIMITY_SENSOR";

    static void handleActionModuleChanged(
            @NonNull Context context,
            boolean hasReceiverModuleChanged,
            boolean hasCameraModuleChanged
    ) {
        if (!hasReceiverModuleChanged && !hasCameraModuleChanged) {
            Log.w(TAG, "handleActionComponentSwapped: No camera changed; Doing nothing...");
        } else {
            Log.w(TAG, "handleActionComponentSwapped: Camera change detected; Launching CameraSwapInfo!");
            sendCameraSwapBroadcast(context, hasReceiverModuleChanged, hasCameraModuleChanged);

            if (hasReceiverModuleChanged) {
                Log.w(TAG, "handleActionCameraSwapped: Receiver module change detected; Launching ProximitySensor!");
                sendProximitySensorBroadcast(context);
            }
        }
    }

    private static void sendCameraSwapBroadcast(
            @NonNull Context context,
            boolean hasReceiverModuleChanged,
            boolean hasCameraModuleChanged
    ) {
        Intent intent = new Intent(ACTION_HANDLE_CAMERA_CHANGED);
        intent.putExtra(EXTRA_FRONT_CAMERA_CHANGED, hasReceiverModuleChanged);
        intent.putExtra(EXTRA_REAR_CAMERA_CHANGED, hasCameraModuleChanged);
        // Anyone can receive this broadcast; CameraSwapInfo is the most important receiver, but any
        // (third party) camera app can listen to it as well.
        context.sendBroadcast(intent);

        // Also send intent explicitly to Camera app, to avoid implicit broadcast restrictions
        ComponentName componentName = new ComponentName("com.android.camera2", "com.android.camera.CameraSwapBroadcastReceiver");
        intent.setComponent(componentName);
        context.sendBroadcast(intent);
    }

    private static void sendProximitySensorBroadcast(@NonNull Context context) {
        Intent intent = new Intent(ACTION_HANDLE_RECEIVER_MODULE_CHANGED);
        context.sendBroadcast(intent, PERMISSION_CALIBRATE_PROXIMITY_SENSOR);
    }
}