/*
 * Copyright (C) 2016 The CyanogenMod Project
 * Copyright (C) 2017-2018,2020 The LineageOS Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.lineageos.setupwizard;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;
import android.widget.ArrayAdapter;
import android.widget.NumberPicker;
import android.widget.Toast;

import com.android.internal.telephony.MccTable;
import com.android.internal.telephony.TelephonyIntents;

import org.lineageos.setupwizard.R;
import org.lineageos.setupwizard.widget.LocalePicker;

import java.util.List;
import java.util.Locale;

public class LocaleActivity extends BaseSetupWizardActivity {

    public static final String TAG = LocaleActivity.class.getSimpleName();

    private ArrayAdapter<com.android.internal.app.LocalePicker.LocaleInfo> mLocaleAdapter;
    private Locale mCurrentLocale;
    private int[] mAdapterIndices;
    private LocalePicker mLanguagePicker;
    private FetchUpdateSimLocaleTask mFetchUpdateSimLocaleTask;
    private final Handler mHandler = new Handler();
    private boolean mPendingLocaleUpdate;
    private boolean mPaused = true;

    private final Runnable mUpdateLocale = new Runnable() {
        public void run() {
            if (mCurrentLocale != null) {
                mLanguagePicker.setEnabled(false);
                com.android.internal.app.LocalePicker.updateLocale(mCurrentLocale);
            }
        }
    };

    private final BroadcastReceiver mSimChangedReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(TelephonyIntents.ACTION_SIM_STATE_CHANGED)) {
                fetchAndUpdateSimLocale();
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setNextText(R.string.next);
        mLanguagePicker = (LocalePicker) findViewById(R.id.locale_list);
        loadLanguages();
    }

    @Override
    public void onPause() {
        super.onPause();
        mPaused = true;
        unregisterReceiver(mSimChangedReceiver);
    }

    @Override
    public void onResume() {
        super.onResume();
        mPaused = false;
        registerReceiver(mSimChangedReceiver,
                new IntentFilter(TelephonyIntents.ACTION_SIM_STATE_CHANGED));
        if (mLanguagePicker != null) {
            mLanguagePicker.setEnabled(true);
        }
        if (mPendingLocaleUpdate) {
            mPendingLocaleUpdate = false;
            fetchAndUpdateSimLocale();
        }
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.setup_locale;
    }

    @Override
    protected int getTitleResId() {
        return R.string.setup_locale;
    }

    @Override
    protected int getIconResId() {
        return R.drawable.ic_locale;
    }

    private void loadLanguages() {
        mLocaleAdapter = com.android.internal.app.LocalePicker.constructAdapter(this,
                R.layout.locale_picker_item, R.id.locale);
        mCurrentLocale = Locale.getDefault();
        fetchAndUpdateSimLocale();
        mAdapterIndices = new int[mLocaleAdapter.getCount()];
        int currentLocaleIndex = 0;
        String [] labels = new String[mLocaleAdapter.getCount()];
        for (int i=0; i<mAdapterIndices.length; i++) {
            com.android.internal.app.LocalePicker.LocaleInfo localLocaleInfo =
                    mLocaleAdapter.getItem(i);
            Locale localLocale = localLocaleInfo.getLocale();
            if (localLocale.equals(mCurrentLocale)) {
                currentLocaleIndex = i;
            }
            mAdapterIndices[i] = i;
            labels[i] = localLocaleInfo.getLabel();
        }
        mLanguagePicker.setDisplayedValues(labels);
        mLanguagePicker.setMaxValue(labels.length - 1);
        mLanguagePicker.setValue(currentLocaleIndex);
        mLanguagePicker.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
        mLanguagePicker.setOnValueChangedListener((pkr, oldVal, newVal) -> setLocaleFromPicker());

        mLanguagePicker.setOnScrollListener((view, scrollState) -> {
            if (scrollState == NumberPicker.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                ((SetupWizardApp)getApplication()).setIgnoreSimLocale(true);
            }
        });
    }

    private void setLocaleFromPicker() {
        ((SetupWizardApp)getApplication()).setIgnoreSimLocale(true);
        int i = mAdapterIndices[mLanguagePicker.getValue()];
        final com.android.internal.app.LocalePicker.LocaleInfo localLocaleInfo =
                mLocaleAdapter.getItem(i);
        onLocaleChanged(localLocaleInfo.getLocale());
    }

    private void onLocaleChanged(Locale paramLocale) {
        mLanguagePicker.setEnabled(true);
        Resources localResources = getResources();
        Configuration localConfiguration1 = localResources.getConfiguration();
        Configuration localConfiguration2 = new Configuration();
        localConfiguration2.locale = paramLocale;
        localResources.updateConfiguration(localConfiguration2, null);
        localResources.updateConfiguration(localConfiguration1, null);
        mHandler.removeCallbacks(mUpdateLocale);
        mCurrentLocale = paramLocale;
        mHandler.postDelayed(mUpdateLocale, 1000);
    }

    private void fetchAndUpdateSimLocale() {
        if (((SetupWizardApp)getApplication()).ignoreSimLocale() || isDestroyed()) {
            return;
        }
        if (mPaused) {
            mPendingLocaleUpdate = true;
            return;
        }
        if (mFetchUpdateSimLocaleTask != null) {
            mFetchUpdateSimLocaleTask.cancel(true);
        }
        mFetchUpdateSimLocaleTask = new FetchUpdateSimLocaleTask();
        mFetchUpdateSimLocaleTask.execute();
    }

    private class FetchUpdateSimLocaleTask extends AsyncTask<Void, Void, Locale> {
        @Override
        protected Locale doInBackground(Void... params) {
            Locale locale = null;
            Activity activity = LocaleActivity.this;
            if (!activity.isFinishing() || !activity.isDestroyed()) {
                // If the sim is currently pin locked, return
                TelephonyManager telephonyManager = (TelephonyManager)
                        activity.getSystemService(Context.TELEPHONY_SERVICE);
                int state = telephonyManager.getSimState();
                if(state == TelephonyManager.SIM_STATE_PIN_REQUIRED ||
                        state == TelephonyManager.SIM_STATE_PUK_REQUIRED) {
                    return null;
                }

                final SubscriptionManager subscriptionManager =
                        SubscriptionManager.from(activity);
                List<SubscriptionInfo> activeSubs =
                        subscriptionManager.getActiveSubscriptionInfoList();
                if (activeSubs == null || activeSubs.isEmpty()) {
                    return null;
                }

                // Fetch locale for active sim's MCC
                int mcc = activeSubs.get(0).getMcc();
                locale = MccTable.getLocaleFromMcc(activity, mcc, null);

                // If that fails, fall back to preferred languages reported
                // by the sim
                if (locale == null) {
                    String localeString = telephonyManager.getLocaleFromDefaultSim();
                    if (localeString != null) {
                        locale = Locale.forLanguageTag(localeString);

                    }
                }
            }
            return locale;
        }

        @Override
        protected void onPostExecute(Locale simLocale) {
            if (simLocale != null && !simLocale.equals(mCurrentLocale)) {
                if (!((SetupWizardApp)getApplication()).ignoreSimLocale() && !isDestroyed()) {
                    String label = getString(R.string.sim_locale_changed,
                            simLocale.getDisplayName());
                    Toast.makeText(LocaleActivity.this, label, Toast.LENGTH_SHORT).show();
                    onLocaleChanged(simLocale);
                    ((SetupWizardApp)getApplication()).setIgnoreSimLocale(true);
                }
            }
        }
    }

}