/*
 * Copyright (C) 2015 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.systemui.statusbar.policy;

import android.content.Context;
import android.content.Intent;
import android.net.NetworkCapabilities;
import android.os.Looper;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.util.SparseArray;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.telephony.TelephonyIntents;
import com.android.internal.telephony.cdma.EriInfo;
import com.android.systemui.R;
import com.android.systemui.statusbar.policy.NetworkController.IconState;
import com.android.systemui.statusbar.policy.NetworkControllerImpl.Config;
import com.android.systemui.statusbar.policy.NetworkControllerImpl.SubscriptionDefaults;

import java.io.PrintWriter;
import java.util.BitSet;
import java.util.Objects;


public class MobileSignalController extends SignalController<
        MobileSignalController.MobileState, MobileSignalController.MobileIconGroup> {
    private final TelephonyManager mPhone;
    private final SubscriptionDefaults mDefaults;
    private final String mNetworkNameDefault;
    private final String mNetworkNameSeparator;
    @VisibleForTesting
    final PhoneStateListener mPhoneStateListener;
    // Save entire info for logging, we only use the id.
    private final SubscriptionInfo mSubscriptionInfo;

    // @VisibleForDemoMode
    final SparseArray<MobileIconGroup> mNetworkToIconLookup;

    // Since some pieces of the phone state are interdependent we store it locally,
    // this could potentially become part of MobileState for simplification/complication
    // of code.
    private int mDataNetType = TelephonyManager.NETWORK_TYPE_UNKNOWN;
    private int mDataState = TelephonyManager.DATA_DISCONNECTED;
    private ServiceState mServiceState;
    private SignalStrength mSignalStrength;
    private MobileIconGroup mDefaultIcons;
    private Config mConfig;

    // TODO: Reduce number of vars passed in, if we have the NetworkController, probably don't
    // need listener lists anymore.
    public MobileSignalController(Context context, Config config, boolean hasMobileData,
            TelephonyManager phone, CallbackHandler callbackHandler,
            NetworkControllerImpl networkController, SubscriptionInfo info,
            SubscriptionDefaults defaults, Looper receiverLooper) {
        super("MobileSignalController(" + info.getSubscriptionId() + ")", context,
                NetworkCapabilities.TRANSPORT_CELLULAR, callbackHandler,
                networkController);
        mNetworkToIconLookup = new SparseArray<>();
        mConfig = config;
        mPhone = phone;
        mDefaults = defaults;
        mSubscriptionInfo = info;
        mPhoneStateListener = new MobilePhoneStateListener(info.getSubscriptionId(),
                receiverLooper);
        mNetworkNameSeparator = getStringIfExists(R.string.status_bar_network_name_separator);
        mNetworkNameDefault = getStringIfExists(
                com.android.internal.R.string.lockscreen_carrier_default);

        mapIconSets();

        mLastState.networkName = mCurrentState.networkName = mNetworkNameDefault;
        mLastState.networkNameData = mCurrentState.networkNameData = mNetworkNameDefault;
        mLastState.enabled = mCurrentState.enabled = hasMobileData;
        mLastState.iconGroup = mCurrentState.iconGroup = mDefaultIcons;
        // Get initial data sim state.
        updateDataSim();
    }

    public void setConfiguration(Config config) {
        mConfig = config;
        mapIconSets();
        updateTelephony();
    }

    public int getDataContentDescription() {
        return getIcons().mDataContentDescription;
    }

    public void setAirplaneMode(boolean airplaneMode) {
        mCurrentState.airplaneMode = airplaneMode;
        notifyListenersIfNecessary();
    }

    @Override
    public void updateConnectivity(BitSet connectedTransports, BitSet validatedTransports) {
        boolean isValidated = validatedTransports.get(mTransportType);
        mCurrentState.isDefault = connectedTransports.get(mTransportType);
        // Only show this as not having connectivity if we are default.
        mCurrentState.inetCondition = (isValidated || !mCurrentState.isDefault) ? 1 : 0;
        notifyListenersIfNecessary();
    }

    public void setCarrierNetworkChangeMode(boolean carrierNetworkChangeMode) {
        mCurrentState.carrierNetworkChangeMode = carrierNetworkChangeMode;
        updateTelephony();
    }

    /**
     * Start listening for phone state changes.
     */
    public void registerListener() {
        mPhone.listen(mPhoneStateListener,
                PhoneStateListener.LISTEN_SERVICE_STATE
                        | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS
                        | PhoneStateListener.LISTEN_CALL_STATE
                        | PhoneStateListener.LISTEN_DATA_CONNECTION_STATE
                        | PhoneStateListener.LISTEN_DATA_ACTIVITY
                        | PhoneStateListener.LISTEN_CARRIER_NETWORK_CHANGE);
    }

    /**
     * Stop listening for phone state changes.
     */
    public void unregisterListener() {
        mPhone.listen(mPhoneStateListener, 0);
    }

    /**
     * Produce a mapping of data network types to icon groups for simple and quick use in
     * updateTelephony.
     */
    private void mapIconSets() {
        mNetworkToIconLookup.clear();

        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EVDO_0, TelephonyIcons.THREE_G);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EVDO_A, TelephonyIcons.THREE_G);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EVDO_B, TelephonyIcons.THREE_G);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EHRPD, TelephonyIcons.THREE_G);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_UMTS, TelephonyIcons.THREE_G);

        if (!mConfig.showAtLeast3G) {
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_UNKNOWN,
                    TelephonyIcons.UNKNOWN);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EDGE, TelephonyIcons.E);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_CDMA, TelephonyIcons.ONE_X);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_1xRTT, TelephonyIcons.ONE_X);

            mDefaultIcons = TelephonyIcons.G;
        } else {
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_UNKNOWN,
                    TelephonyIcons.THREE_G);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_EDGE,
                    TelephonyIcons.THREE_G);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_CDMA,
                    TelephonyIcons.THREE_G);
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_1xRTT,
                    TelephonyIcons.THREE_G);
            mDefaultIcons = TelephonyIcons.THREE_G;
        }

        MobileIconGroup hGroup = TelephonyIcons.THREE_G;
        if (mConfig.hspaDataDistinguishable) {
            hGroup = TelephonyIcons.H;
        }
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_HSDPA, hGroup);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_HSUPA, hGroup);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_HSPA, hGroup);
        mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_HSPAP, hGroup);

        if (mConfig.show4gForLte) {
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_LTE, TelephonyIcons.FOUR_G);
        } else {
            mNetworkToIconLookup.put(TelephonyManager.NETWORK_TYPE_LTE, TelephonyIcons.LTE);
        }
    }

    @Override
    public void notifyListeners() {
        MobileIconGroup icons = getIcons();

        String contentDescription = getStringIfExists(getContentDescription());
        String dataContentDescription = getStringIfExists(icons.mDataContentDescription);

        // Show icon in QS when we are connected or need to show roaming.
        boolean showDataIcon = mCurrentState.dataConnected
                || mCurrentState.iconGroup == TelephonyIcons.ROAMING;
        IconState statusIcon = new IconState(mCurrentState.enabled && !mCurrentState.airplaneMode,
                getCurrentIconId(), contentDescription);

        int qsTypeIcon = 0;
        IconState qsIcon = null;
        String description = null;
        // Only send data sim callbacks to QS.
        if (mCurrentState.dataSim) {
            qsTypeIcon = showDataIcon ? icons.mQsDataType : 0;
            qsIcon = new IconState(mCurrentState.enabled
                    && !mCurrentState.isEmergency, getQsCurrentIconId(), contentDescription);
            description = mCurrentState.isEmergency ? null : mCurrentState.networkName;
        }
        boolean activityIn = mCurrentState.dataConnected
                        && !mCurrentState.carrierNetworkChangeMode
                        && mCurrentState.activityIn;
        boolean activityOut = mCurrentState.dataConnected
                        && !mCurrentState.carrierNetworkChangeMode
                        && mCurrentState.activityOut;
        showDataIcon &= mCurrentState.isDefault;
        int typeIcon = showDataIcon ? icons.mDataType : 0;
        mCallbackHandler.setMobileDataIndicators(statusIcon, qsIcon, typeIcon, qsTypeIcon,
                activityIn, activityOut, dataContentDescription, description, icons.mIsWide,
                mSubscriptionInfo.getSubscriptionId());
    }

    @Override
    protected MobileState cleanState() {
        return new MobileState();
    }

    private boolean hasService() {
        if (mServiceState != null) {
            // Consider the device to be in service if either voice or data
            // service is available. Some SIM cards are marketed as data-only
            // and do not support voice service, and on these SIM cards, we
            // want to show signal bars for data service as well as the "no
            // service" or "emergency calls only" text that indicates that voice
            // is not available.
            switch (mServiceState.getVoiceRegState()) {
                case ServiceState.STATE_POWER_OFF:
                    return false;
                case ServiceState.STATE_OUT_OF_SERVICE:
                case ServiceState.STATE_EMERGENCY_ONLY:
                    return mServiceState.getDataRegState() == ServiceState.STATE_IN_SERVICE;
                default:
                    return true;
            }
        } else {
            return false;
        }
    }

    private boolean isCdma() {
        return (mSignalStrength != null) && !mSignalStrength.isGsm();
    }

    public boolean isEmergencyOnly() {
        return (mServiceState != null && mServiceState.isEmergencyOnly());
    }

    private boolean isRoaming() {
        if (isCdma()) {
            final int iconMode = mServiceState.getCdmaEriIconMode();
            return mServiceState.getCdmaEriIconIndex() != EriInfo.ROAMING_INDICATOR_OFF
                    && (iconMode == EriInfo.ROAMING_ICON_MODE_NORMAL
                        || iconMode == EriInfo.ROAMING_ICON_MODE_FLASH);
        } else {
            return mServiceState != null && mServiceState.getRoaming();
        }
    }

    private boolean isCarrierNetworkChangeActive() {
        return mCurrentState.carrierNetworkChangeMode;
    }

    public void handleBroadcast(Intent intent) {
        String action = intent.getAction();
        if (action.equals(TelephonyIntents.SPN_STRINGS_UPDATED_ACTION)) {
            updateNetworkName(intent.getBooleanExtra(TelephonyIntents.EXTRA_SHOW_SPN, false),
                    intent.getStringExtra(TelephonyIntents.EXTRA_SPN),
                    intent.getStringExtra(TelephonyIntents.EXTRA_DATA_SPN),
                    intent.getBooleanExtra(TelephonyIntents.EXTRA_SHOW_PLMN, false),
                    intent.getStringExtra(TelephonyIntents.EXTRA_PLMN));
            notifyListenersIfNecessary();
        } else if (action.equals(TelephonyIntents.ACTION_DEFAULT_DATA_SUBSCRIPTION_CHANGED)) {
            updateDataSim();
        }
    }

    private void updateDataSim() {
        int defaultDataSub = mDefaults.getDefaultDataSubId();
        if (SubscriptionManager.isValidSubscriptionId(defaultDataSub)) {
            mCurrentState.dataSim = defaultDataSub == mSubscriptionInfo.getSubscriptionId();
        } else {
            // There doesn't seem to be a data sim selected, however if
            // there isn't a MobileSignalController with dataSim set, then
            // QS won't get any callbacks and will be blank.  Instead
            // lets just assume we are the data sim (which will basically
            // show one at random) in QS until one is selected.  The user
            // should pick one soon after, so we shouldn't be in this state
            // for long.
            mCurrentState.dataSim = true;
        }
        notifyListenersIfNecessary();
    }

    /**
     * Updates the network's name based on incoming spn and plmn.
     */
    void updateNetworkName(boolean showSpn, String spn, String dataSpn,
            boolean showPlmn, String plmn) {
        if (CHATTY) {
            Log.d("CarrierLabel", "updateNetworkName showSpn=" + showSpn
                    + " spn=" + spn + " dataSpn=" + dataSpn
                    + " showPlmn=" + showPlmn + " plmn=" + plmn);
        }
        StringBuilder str = new StringBuilder();
        StringBuilder strData = new StringBuilder();
        if (showPlmn && plmn != null) {
            str.append(plmn);
            strData.append(plmn);
        }
        if (showSpn && spn != null) {
            if (str.length() != 0) {
                str.append(mNetworkNameSeparator);
            }
            str.append(spn);
        }
        if (str.length() != 0) {
            mCurrentState.networkName = str.toString();
        } else {
            mCurrentState.networkName = mNetworkNameDefault;
        }
        if (showSpn && dataSpn != null) {
            if (strData.length() != 0) {
                strData.append(mNetworkNameSeparator);
            }
            strData.append(dataSpn);
        }
        if (strData.length() != 0) {
            mCurrentState.networkNameData = strData.toString();
        } else {
            mCurrentState.networkNameData = mNetworkNameDefault;
        }
    }

    /**
     * Updates the current state based on mServiceState, mSignalStrength, mDataNetType,
     * mDataState, and mSimState.  It should be called any time one of these is updated.
     * This will call listeners if necessary.
     */
    private final void updateTelephony() {
        if (DEBUG) {
            Log.d(mTag, "updateTelephonySignalStrength: hasService=" + hasService()
                    + " ss=" + mSignalStrength);
        }
        mCurrentState.connected = hasService() && mSignalStrength != null;
        if (mCurrentState.connected) {
            if (!mSignalStrength.isGsm() && mConfig.alwaysShowCdmaRssi) {
                mCurrentState.level = mSignalStrength.getCdmaLevel();
            } else {
                mCurrentState.level = mSignalStrength.getLevel();
            }
        }
        if (mNetworkToIconLookup.indexOfKey(mDataNetType) >= 0) {
            mCurrentState.iconGroup = mNetworkToIconLookup.get(mDataNetType);
        } else {
            mCurrentState.iconGroup = mDefaultIcons;
        }
        mCurrentState.dataConnected = mCurrentState.connected
                && mDataState == TelephonyManager.DATA_CONNECTED;

        if (isCarrierNetworkChangeActive()) {
            mCurrentState.iconGroup = TelephonyIcons.CARRIER_NETWORK_CHANGE;
        } else if (isRoaming()) {
            mCurrentState.iconGroup = TelephonyIcons.ROAMING;
        }
        if (isEmergencyOnly() != mCurrentState.isEmergency) {
            mCurrentState.isEmergency = isEmergencyOnly();
            mNetworkController.recalculateEmergency();
        }
        // Fill in the network name if we think we have it.
        if (mCurrentState.networkName == mNetworkNameDefault && mServiceState != null
                && mServiceState.getOperatorAlphaShort() != null) {
            mCurrentState.networkName = mServiceState.getOperatorAlphaShort();
        }

        notifyListenersIfNecessary();
    }

    @VisibleForTesting
    void setActivity(int activity) {
        mCurrentState.activityIn = activity == TelephonyManager.DATA_ACTIVITY_INOUT
                || activity == TelephonyManager.DATA_ACTIVITY_IN;
        mCurrentState.activityOut = activity == TelephonyManager.DATA_ACTIVITY_INOUT
                || activity == TelephonyManager.DATA_ACTIVITY_OUT;
        notifyListenersIfNecessary();
    }

    @Override
    public void dump(PrintWriter pw) {
        super.dump(pw);
        pw.println("  mSubscription=" + mSubscriptionInfo + ",");
        pw.println("  mServiceState=" + mServiceState + ",");
        pw.println("  mSignalStrength=" + mSignalStrength + ",");
        pw.println("  mDataState=" + mDataState + ",");
        pw.println("  mDataNetType=" + mDataNetType + ",");
    }

    class MobilePhoneStateListener extends PhoneStateListener {
        public MobilePhoneStateListener(int subId, Looper looper) {
            super(subId, looper);
        }

        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength) {
            if (DEBUG) {
                Log.d(mTag, "onSignalStrengthsChanged signalStrength=" + signalStrength +
                        ((signalStrength == null) ? "" : (" level=" + signalStrength.getLevel())));
            }
            mSignalStrength = signalStrength;
            updateTelephony();
        }

        @Override
        public void onServiceStateChanged(ServiceState state) {
            if (DEBUG) {
                Log.d(mTag, "onServiceStateChanged voiceState=" + state.getVoiceRegState()
                        + " dataState=" + state.getDataRegState());
            }
            mServiceState = state;
            updateTelephony();
        }

        @Override
        public void onDataConnectionStateChanged(int state, int networkType) {
            if (DEBUG) {
                Log.d(mTag, "onDataConnectionStateChanged: state=" + state
                        + " type=" + networkType);
            }
            mDataState = state;
            mDataNetType = networkType;
            updateTelephony();
        }

        @Override
        public void onDataActivity(int direction) {
            if (DEBUG) {
                Log.d(mTag, "onDataActivity: direction=" + direction);
            }
            setActivity(direction);
        }

        @Override
        public void onCarrierNetworkChange(boolean active) {
            if (DEBUG) {
                Log.d(mTag, "onCarrierNetworkChange: active=" + active);
            }
            mCurrentState.carrierNetworkChangeMode = active;

            updateTelephony();
        }
    };

    static class MobileIconGroup extends SignalController.IconGroup {
        final int mDataContentDescription; // mContentDescriptionDataType
        final int mDataType;
        final boolean mIsWide;
        final int mQsDataType;

        public MobileIconGroup(String name, int[][] sbIcons, int[][] qsIcons, int[] contentDesc,
                int sbNullState, int qsNullState, int sbDiscState, int qsDiscState,
                int discContentDesc, int dataContentDesc, int dataType, boolean isWide,
                int qsDataType) {
            super(name, sbIcons, qsIcons, contentDesc, sbNullState, qsNullState, sbDiscState,
                    qsDiscState, discContentDesc);
            mDataContentDescription = dataContentDesc;
            mDataType = dataType;
            mIsWide = isWide;
            mQsDataType = qsDataType;
        }
    }

    static class MobileState extends SignalController.State {
        String networkName;
        String networkNameData;
        boolean dataSim;
        boolean dataConnected;
        boolean isEmergency;
        boolean airplaneMode;
        boolean carrierNetworkChangeMode;
        boolean isDefault;

        @Override
        public void copyFrom(State s) {
            super.copyFrom(s);
            MobileState state = (MobileState) s;
            dataSim = state.dataSim;
            networkName = state.networkName;
            networkNameData = state.networkNameData;
            dataConnected = state.dataConnected;
            isDefault = state.isDefault;
            isEmergency = state.isEmergency;
            airplaneMode = state.airplaneMode;
            carrierNetworkChangeMode = state.carrierNetworkChangeMode;
        }

        @Override
        protected void toString(StringBuilder builder) {
            super.toString(builder);
            builder.append(',');
            builder.append("dataSim=").append(dataSim).append(',');
            builder.append("networkName=").append(networkName).append(',');
            builder.append("networkNameData=").append(networkNameData).append(',');
            builder.append("dataConnected=").append(dataConnected).append(',');
            builder.append("isDefault=").append(isDefault).append(',');
            builder.append("isEmergency=").append(isEmergency).append(',');
            builder.append("airplaneMode=").append(airplaneMode).append(',');
            builder.append("carrierNetworkChangeMode=").append(carrierNetworkChangeMode);
        }

        @Override
        public boolean equals(Object o) {
            return super.equals(o)
                    && Objects.equals(((MobileState) o).networkName, networkName)
                    && Objects.equals(((MobileState) o).networkNameData, networkNameData)
                    && ((MobileState) o).dataSim == dataSim
                    && ((MobileState) o).dataConnected == dataConnected
                    && ((MobileState) o).isEmergency == isEmergency
                    && ((MobileState) o).airplaneMode == airplaneMode
                    && ((MobileState) o).carrierNetworkChangeMode == carrierNetworkChangeMode
                    && ((MobileState) o).isDefault == isDefault;
        }
    }
}