package com.device.security;

import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Callback;

import android.provider.Settings;

import android.os.Build;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;

public class DeviceSecurityModule extends ReactContextBaseJavaModule {

    private final ReactApplicationContext reactContext;

    public DeviceSecurityModule(ReactApplicationContext reactContext) {
        super(reactContext);
        this.reactContext = reactContext;
    }

    @Override
    public String getName() {
        return "DeviceSecurity";
    }

    @ReactMethod
    public void sampleMethod(String stringArgument, int numberArgument, Callback callback) {
        // TODO: Implement some actually useful functionality
        callback.invoke("Received numberArgument: " + numberArgument + " stringArgument: " + stringArgument);
    }

    @ReactMethod
    public void isAdbEnabled(Promise promise) {
        int adb = 0;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
            adb = Settings.Global.getInt(getCurrentActivity().getContentResolver(),
                    Settings.Global.ADB_ENABLED, 0);
        }
        promise.resolve(adb == 1);
    }

    /**
     * Checks if the device is rooted.
     *
     * @return <code>true</code> if the device is rooted, <code>false</code> otherwise.
     */
    @ReactMethod
    public void isRooted(Promise promise) {
        promise.resolve(checkRootMethod1() || checkRootMethod2() || checkRootMethod3());
        return;
    }

    private static boolean checkRootMethod1() {
        String buildTags = android.os.Build.TAGS;
        return buildTags != null && buildTags.contains("test-keys");
    }

    private static boolean checkRootMethod2() {
        String[] paths = { "/system/app/Superuser.apk", "/sbin/su", "/system/bin/su", "/system/xbin/su", "/data/local/xbin/su", "/data/local/bin/su", "/system/sd/xbin/su",
                "/system/bin/failsafe/su", "/data/local/su", "/su/bin/su"};
        for (String path : paths) {
            if (new File(path).exists()) return true;
        }
        return false;
    }

    private static boolean checkRootMethod3() {
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(new String[] { "/system/xbin/which", "su" });
            BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
            if (in.readLine() != null) return true;
            return false;
        } catch (Throwable t) {
            return false;
        } finally {
            if (process != null) process.destroy();
        }
    }
}