/*
 * Copyright (C) 2009 The Android Open Source 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 com.android.settings;


import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.admin.DevicePolicyManager;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.nfc.NfcAdapter;
import android.nfc.NfcManager;
import android.os.Bundle;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.os.UserManager;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceScreen;
import android.preference.SwitchPreference;
import android.provider.SearchIndexableResource;
import android.provider.Settings;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;

import com.android.internal.telephony.SmsApplication;
import com.android.internal.telephony.SmsApplication.SmsApplicationData;
import com.android.internal.telephony.TelephonyIntents;
import com.android.internal.telephony.TelephonyProperties;
import com.android.settings.nfc.NfcEnabler;
import com.android.settings.search.BaseSearchIndexProvider;
import com.android.settings.search.Indexable;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

public class WirelessSettings extends SettingsPreferenceFragment
        implements OnPreferenceChangeListener, Indexable {
    private static final String TAG = "WirelessSettings";

    private static final String KEY_TOGGLE_AIRPLANE = "toggle_airplane";
    private static final String KEY_TOGGLE_NFC = "toggle_nfc";
    private static final String KEY_WIMAX_SETTINGS = "wimax_settings";
    private static final String KEY_ANDROID_BEAM_SETTINGS = "android_beam_settings";
    private static final String KEY_VPN_SETTINGS = "vpn_settings";
    private static final String KEY_TETHER_SETTINGS = "tether_settings";
    private static final String KEY_PROXY_SETTINGS = "proxy_settings";
    private static final String KEY_MOBILE_NETWORK_SETTINGS = "mobile_network_settings";
    private static final String KEY_MANAGE_MOBILE_PLAN = "manage_mobile_plan";
    private static final String KEY_SMS_APPLICATION = "sms_application";
    private static final String KEY_TOGGLE_NSD = "toggle_nsd"; //network service discovery
    private static final String KEY_CELL_BROADCAST_SETTINGS = "cell_broadcast_settings";

    public static final String EXIT_ECM_RESULT = "exit_ecm_result";
    public static final int REQUEST_CODE_EXIT_ECM = 1;

    private AirplaneModeEnabler mAirplaneModeEnabler;
    private SwitchPreference mAirplaneModePreference;
    private NfcEnabler mNfcEnabler;
    private NfcAdapter mNfcAdapter;
    private NsdEnabler mNsdEnabler;

    private ConnectivityManager mCm;
    private TelephonyManager mTm;
    private PackageManager mPm;
    private UserManager mUm;

    private static final int MANAGE_MOBILE_PLAN_DIALOG_ID = 1;
    private static final String SAVED_MANAGE_MOBILE_PLAN_MSG = "mManageMobilePlanMessage";

    private AppListPreference mSmsApplicationPreference;

    /**
     * Invoked on each preference click in this hierarchy, overrides
     * PreferenceFragment's implementation.  Used to make sure we track the
     * preference click events.
     */
    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
        log("onPreferenceTreeClick: preference=" + preference);
        if (preference == mAirplaneModePreference && Boolean.parseBoolean(
                SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
            // In ECM mode launch ECM app dialog
            startActivityForResult(
                new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null),
                REQUEST_CODE_EXIT_ECM);
            return true;
        } else if (preference == findPreference(KEY_MANAGE_MOBILE_PLAN)) {
            onManageMobilePlanClick();
        }
        // Let the intents be launched by the Preference manager
        return super.onPreferenceTreeClick(preferenceScreen, preference);
    }

    private String mManageMobilePlanMessage;
    public void onManageMobilePlanClick() {
        log("onManageMobilePlanClick:");
        mManageMobilePlanMessage = null;
        Resources resources = getActivity().getResources();

        NetworkInfo ni = mCm.getProvisioningOrActiveNetworkInfo();
        if (mTm.hasIccCard() && (ni != null)) {
            // Check for carrier apps that can handle provisioning first
            Intent provisioningIntent = new Intent(TelephonyIntents.ACTION_CARRIER_SETUP);
            List<String> carrierPackages =
                    mTm.getCarrierPackageNamesForIntent(provisioningIntent);
            if (carrierPackages != null && !carrierPackages.isEmpty()) {
                if (carrierPackages.size() != 1) {
                    Log.w(TAG, "Multiple matching carrier apps found, launching the first.");
                }
                provisioningIntent.setPackage(carrierPackages.get(0));
                startActivity(provisioningIntent);
                return;
            }

            // Get provisioning URL
            String url = mCm.getMobileProvisioningUrl();
            if (!TextUtils.isEmpty(url)) {
                Intent intent = Intent.makeMainSelectorActivity(Intent.ACTION_MAIN,
                        Intent.CATEGORY_APP_BROWSER);
                intent.setData(Uri.parse(url));
                intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT |
                        Intent.FLAG_ACTIVITY_NEW_TASK);
                try {
                    startActivity(intent);
                } catch (ActivityNotFoundException e) {
                    Log.w(TAG, "onManageMobilePlanClick: startActivity failed" + e);
                }
            } else {
                // No provisioning URL
                String operatorName = mTm.getSimOperatorName();
                if (TextUtils.isEmpty(operatorName)) {
                    // Use NetworkOperatorName as second choice in case there is no
                    // SPN (Service Provider Name on the SIM). Such as with T-mobile.
                    operatorName = mTm.getNetworkOperatorName();
                    if (TextUtils.isEmpty(operatorName)) {
                        mManageMobilePlanMessage = resources.getString(
                                R.string.mobile_unknown_sim_operator);
                    } else {
                        mManageMobilePlanMessage = resources.getString(
                                R.string.mobile_no_provisioning_url, operatorName);
                    }
                } else {
                    mManageMobilePlanMessage = resources.getString(
                            R.string.mobile_no_provisioning_url, operatorName);
                }
            }
        } else if (mTm.hasIccCard() == false) {
            // No sim card
            mManageMobilePlanMessage = resources.getString(R.string.mobile_insert_sim_card);
        } else {
            // NetworkInfo is null, there is no connection
            mManageMobilePlanMessage = resources.getString(R.string.mobile_connect_to_internet);
        }
        if (!TextUtils.isEmpty(mManageMobilePlanMessage)) {
            log("onManageMobilePlanClick: message=" + mManageMobilePlanMessage);
            showDialog(MANAGE_MOBILE_PLAN_DIALOG_ID);
        }
    }

    private void initSmsApplicationSetting() {
        log("initSmsApplicationSetting:");
        Collection<SmsApplicationData> smsApplications =
                SmsApplication.getApplicationCollection(getActivity());

        // If the list is empty the dialog will be empty, but we will not crash.
        int count = smsApplications.size();
        String[] packageNames = new String[count];
        int i = 0;
        for (SmsApplicationData smsApplicationData : smsApplications) {
            packageNames[i] = smsApplicationData.mPackageName;
            i++;
        }
        String defaultPackageName = null;
        ComponentName appName = SmsApplication.getDefaultSmsApplication(getActivity(), true);
        if (appName != null) {
            defaultPackageName = appName.getPackageName();
        }
        mSmsApplicationPreference.setPackageNames(packageNames, defaultPackageName);
    }

    @Override
    public Dialog onCreateDialog(int dialogId) {
        log("onCreateDialog: dialogId=" + dialogId);
        switch (dialogId) {
            case MANAGE_MOBILE_PLAN_DIALOG_ID:
                return new AlertDialog.Builder(getActivity())
                            .setMessage(mManageMobilePlanMessage)
                            .setCancelable(false)
                            .setPositiveButton(com.android.internal.R.string.ok,
                                    new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int id) {
                                    log("MANAGE_MOBILE_PLAN_DIALOG.onClickListener id=" + id);
                                    mManageMobilePlanMessage = null;
                                }
                            })
                            .create();
        }
        return super.onCreateDialog(dialogId);
    }

    private void log(String s) {
        Log.d(TAG, s);
    }

    public static boolean isRadioAllowed(Context context, String type) {
        if (!AirplaneModeEnabler.isAirplaneModeOn(context)) {
            return true;
        }
        // Here we use the same logic in onCreate().
        String toggleable = Settings.Global.getString(context.getContentResolver(),
                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
        return toggleable != null && toggleable.contains(type);
    }

    private boolean isSmsSupported() {
        // Some tablet has sim card but could not do telephony operations. Skip those.
        return mTm.isSmsCapable();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            mManageMobilePlanMessage = savedInstanceState.getString(SAVED_MANAGE_MOBILE_PLAN_MSG);
        }
        log("onCreate: mManageMobilePlanMessage=" + mManageMobilePlanMessage);

        mCm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        mTm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        mPm = getPackageManager();
        mUm = (UserManager) getSystemService(Context.USER_SERVICE);

        addPreferencesFromResource(R.xml.wireless_settings);

        final int myUserId = UserHandle.myUserId();
        final boolean isSecondaryUser = myUserId != UserHandle.USER_OWNER;
        final boolean isRestrictedUser = mUm.getUserInfo(myUserId).isRestricted();

        final Activity activity = getActivity();
        mAirplaneModePreference = (SwitchPreference) findPreference(KEY_TOGGLE_AIRPLANE);
        SwitchPreference nfc = (SwitchPreference) findPreference(KEY_TOGGLE_NFC);
        PreferenceScreen androidBeam = (PreferenceScreen) findPreference(KEY_ANDROID_BEAM_SETTINGS);
        SwitchPreference nsd = (SwitchPreference) findPreference(KEY_TOGGLE_NSD);

        mAirplaneModeEnabler = new AirplaneModeEnabler(activity, mAirplaneModePreference);
        mNfcEnabler = new NfcEnabler(activity, nfc, androidBeam);

        mSmsApplicationPreference = (AppListPreference) findPreference(KEY_SMS_APPLICATION);
        // Restricted users cannot currently read/write SMS.
        if (isRestrictedUser) {
            removePreference(KEY_SMS_APPLICATION);
        } else {
            mSmsApplicationPreference.setOnPreferenceChangeListener(this);
            initSmsApplicationSetting();
        }

        // Remove NSD checkbox by default
        getPreferenceScreen().removePreference(nsd);
        //mNsdEnabler = new NsdEnabler(activity, nsd);

        String toggleable = Settings.Global.getString(activity.getContentResolver(),
                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);

        //enable/disable wimax depending on the value in config.xml
        final boolean isWimaxEnabled = !isSecondaryUser && this.getResources().getBoolean(
                com.android.internal.R.bool.config_wimaxEnabled);
        if (!isWimaxEnabled
                || mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
            PreferenceScreen root = getPreferenceScreen();
            Preference ps = (Preference) findPreference(KEY_WIMAX_SETTINGS);
            if (ps != null) root.removePreference(ps);
        } else {
            if (toggleable == null || !toggleable.contains(Settings.Global.RADIO_WIMAX )
                    && isWimaxEnabled) {
                Preference ps = (Preference) findPreference(KEY_WIMAX_SETTINGS);
                ps.setDependency(KEY_TOGGLE_AIRPLANE);
            }
        }

        // Manually set dependencies for Wifi when not toggleable.
        if (toggleable == null || !toggleable.contains(Settings.Global.RADIO_WIFI)) {
            findPreference(KEY_VPN_SETTINGS).setDependency(KEY_TOGGLE_AIRPLANE);
        }
        // Disable VPN.
        if (isSecondaryUser || mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) {
            removePreference(KEY_VPN_SETTINGS);
        }

        // Manually set dependencies for Bluetooth when not toggleable.
        if (toggleable == null || !toggleable.contains(Settings.Global.RADIO_BLUETOOTH)) {
            // No bluetooth-dependent items in the list. Code kept in case one is added later.
        }

        // Manually set dependencies for NFC when not toggleable.
        if (toggleable == null || !toggleable.contains(Settings.Global.RADIO_NFC)) {
            findPreference(KEY_TOGGLE_NFC).setDependency(KEY_TOGGLE_AIRPLANE);
            findPreference(KEY_ANDROID_BEAM_SETTINGS).setDependency(KEY_TOGGLE_AIRPLANE);
        }

        // Remove NFC if not available
        mNfcAdapter = NfcAdapter.getDefaultAdapter(activity);
        if (mNfcAdapter == null) {
            getPreferenceScreen().removePreference(nfc);
            getPreferenceScreen().removePreference(androidBeam);
            mNfcEnabler = null;
        }

        // Remove Mobile Network Settings and Manage Mobile Plan for secondary users,
        // if it's a wifi-only device, or if the settings are restricted.
        if (isSecondaryUser || Utils.isWifiOnly(getActivity())
                || mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
            removePreference(KEY_MOBILE_NETWORK_SETTINGS);
            removePreference(KEY_MANAGE_MOBILE_PLAN);
        }
        // Remove Mobile Network Settings and Manage Mobile Plan
        // if config_show_mobile_plan sets false.
        final boolean isMobilePlanEnabled = this.getResources().getBoolean(
                R.bool.config_show_mobile_plan);
        if (!isMobilePlanEnabled) {
            Preference pref = findPreference(KEY_MANAGE_MOBILE_PLAN);
            if (pref != null) {
                removePreference(KEY_MANAGE_MOBILE_PLAN);
            }
        }

        // Remove SMS Application if the device does not support SMS
        if (!isSmsSupported()) {
            removePreference(KEY_SMS_APPLICATION);
        }

        // Remove Airplane Mode settings if it's a stationary device such as a TV.
        if (mPm.hasSystemFeature(PackageManager.FEATURE_TELEVISION)) {
            removePreference(KEY_TOGGLE_AIRPLANE);
        }

        // Enable Proxy selector settings if allowed.
        Preference mGlobalProxy = findPreference(KEY_PROXY_SETTINGS);
        final DevicePolicyManager mDPM = (DevicePolicyManager)
                activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
        // proxy UI disabled until we have better app support
        getPreferenceScreen().removePreference(mGlobalProxy);
        mGlobalProxy.setEnabled(mDPM.getGlobalProxyAdmin() == null);

        // Disable Tethering if it's not allowed or if it's a wifi-only device
        final ConnectivityManager cm =
                (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (isSecondaryUser || !cm.isTetheringSupported()
                || mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING)) {
            getPreferenceScreen().removePreference(findPreference(KEY_TETHER_SETTINGS));
        } else {
            Preference p = findPreference(KEY_TETHER_SETTINGS);
            p.setTitle(Utils.getTetheringLabel(cm));

            // Grey out if provisioning is not available.
            p.setEnabled(!TetherSettings
                    .isProvisioningNeededButUnavailable(getActivity()));
        }

        // Enable link to CMAS app settings depending on the value in config.xml.
        boolean isCellBroadcastAppLinkEnabled = this.getResources().getBoolean(
                com.android.internal.R.bool.config_cellBroadcastAppLinks);
        try {
            if (isCellBroadcastAppLinkEnabled) {
                if (mPm.getApplicationEnabledSetting("com.android.cellbroadcastreceiver")
                        == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
                    isCellBroadcastAppLinkEnabled = false;  // CMAS app disabled
                }
            }
        } catch (IllegalArgumentException ignored) {
            isCellBroadcastAppLinkEnabled = false;  // CMAS app not installed
        }
        if (isSecondaryUser || !isCellBroadcastAppLinkEnabled
                || mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_CELL_BROADCASTS)) {
            PreferenceScreen root = getPreferenceScreen();
            Preference ps = findPreference(KEY_CELL_BROADCAST_SETTINGS);
            if (ps != null) root.removePreference(ps);
        }
    }

    @Override
    public void onStart() {
        super.onStart();

        initSmsApplicationSetting();
    }

    @Override
    public void onResume() {
        super.onResume();

        mAirplaneModeEnabler.resume();
        if (mNfcEnabler != null) {
            mNfcEnabler.resume();
        }
        if (mNsdEnabler != null) {
            mNsdEnabler.resume();
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        if (!TextUtils.isEmpty(mManageMobilePlanMessage)) {
            outState.putString(SAVED_MANAGE_MOBILE_PLAN_MSG, mManageMobilePlanMessage);
        }
    }

    @Override
    public void onPause() {
        super.onPause();

        mAirplaneModeEnabler.pause();
        if (mNfcEnabler != null) {
            mNfcEnabler.pause();
        }
        if (mNsdEnabler != null) {
            mNsdEnabler.pause();
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE_EXIT_ECM) {
            Boolean isChoiceYes = data.getBooleanExtra(EXIT_ECM_RESULT, false);
            // Set Airplane mode based on the return value and checkbox state
            mAirplaneModeEnabler.setAirplaneModeInECM(isChoiceYes,
                    mAirplaneModePreference.isChecked());
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    protected int getHelpResource() {
        return R.string.help_url_more_networks;
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        if (preference == mSmsApplicationPreference && newValue != null) {
            SmsApplication.setDefaultApplication(newValue.toString(), getActivity());
            return true;
        }
        return false;
    }

    /**
     * For Search.
     */
    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
        new BaseSearchIndexProvider() {
            @Override
            public List<SearchIndexableResource> getXmlResourcesToIndex(
                    Context context, boolean enabled) {
                SearchIndexableResource sir = new SearchIndexableResource(context);
                sir.xmlResId = R.xml.wireless_settings;
                return Arrays.asList(sir);
            }

            @Override
            public List<String> getNonIndexableKeys(Context context) {
                final ArrayList<String> result = new ArrayList<String>();

                result.add(KEY_TOGGLE_NSD);

                final UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);
                final int myUserId = UserHandle.myUserId();
                final boolean isSecondaryUser = myUserId != UserHandle.USER_OWNER;
                final boolean isRestrictedUser = um.getUserInfo(myUserId).isRestricted();
                final boolean isWimaxEnabled = !isSecondaryUser
                        && context.getResources().getBoolean(
                        com.android.internal.R.bool.config_wimaxEnabled);
                if (!isWimaxEnabled
                        || um.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
                    result.add(KEY_WIMAX_SETTINGS);
                }

                if (isSecondaryUser) { // Disable VPN
                    result.add(KEY_VPN_SETTINGS);
                }

                // Remove NFC if not available
                final NfcManager manager = (NfcManager)
                        context.getSystemService(Context.NFC_SERVICE);
                if (manager != null) {
                    NfcAdapter adapter = manager.getDefaultAdapter();
                    if (adapter == null) {
                        result.add(KEY_TOGGLE_NFC);
                        result.add(KEY_ANDROID_BEAM_SETTINGS);
                    }
                }

                // Remove Mobile Network Settings and Manage Mobile Plan if it's a wifi-only device.
                if (isSecondaryUser || Utils.isWifiOnly(context)) {
                    result.add(KEY_MOBILE_NETWORK_SETTINGS);
                    result.add(KEY_MANAGE_MOBILE_PLAN);
                }

                // Remove Mobile Network Settings and Manage Mobile Plan
                // if config_show_mobile_plan sets false.
                final boolean isMobilePlanEnabled = context.getResources().getBoolean(
                        R.bool.config_show_mobile_plan);
                if (!isMobilePlanEnabled) {
                    result.add(KEY_MANAGE_MOBILE_PLAN);
                }

                // Remove SMS Application if the device does not support SMS
                TelephonyManager tm =
                        (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
                if (!tm.isSmsCapable() || isRestrictedUser) {
                    result.add(KEY_SMS_APPLICATION);
                }

                final PackageManager pm = context.getPackageManager();

                // Remove Airplane Mode settings if it's a stationary device such as a TV.
                if (pm.hasSystemFeature(PackageManager.FEATURE_TELEVISION)) {
                    result.add(KEY_TOGGLE_AIRPLANE);
                }

                // proxy UI disabled until we have better app support
                result.add(KEY_PROXY_SETTINGS);

                // Disable Tethering if it's not allowed or if it's a wifi-only device
                ConnectivityManager cm = (ConnectivityManager)
                        context.getSystemService(Context.CONNECTIVITY_SERVICE);
                if (isSecondaryUser || !cm.isTetheringSupported()) {
                    result.add(KEY_TETHER_SETTINGS);
                }

                // Enable link to CMAS app settings depending on the value in config.xml.
                boolean isCellBroadcastAppLinkEnabled = context.getResources().getBoolean(
                        com.android.internal.R.bool.config_cellBroadcastAppLinks);
                try {
                    if (isCellBroadcastAppLinkEnabled) {
                        if (pm.getApplicationEnabledSetting("com.android.cellbroadcastreceiver")
                                == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
                            isCellBroadcastAppLinkEnabled = false;  // CMAS app disabled
                        }
                    }
                } catch (IllegalArgumentException ignored) {
                    isCellBroadcastAppLinkEnabled = false;  // CMAS app not installed
                }
                if (isSecondaryUser || !isCellBroadcastAppLinkEnabled) {
                    result.add(KEY_CELL_BROADCAST_SETTINGS);
                }

                return result;
            }
        };
}