/*
 * Copyright (C) 2008 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 android.telephony;

import com.android.internal.telephony.*;

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

import android.annotation.SdkConstant.SdkConstantType;
import android.annotation.SdkConstant;
import android.content.Context;
import android.os.Bundle;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemProperties;


/**
 * Provides access to information about the telephony services on
 * the device. Applications can use the methods in this class to
 * determine telephony services and states, as well as to access some
 * types of subscriber information. Applications can also register 
 * a listener to receive notification of telephony state changes. 
 * <p>
 * You do not instantiate this class directly; instead, you retrieve
 * a reference to an instance through 
 * {@link android.content.Context#getSystemService
 * Context.getSystemService(Context.TELEPHONY_SERVICE)}.
 * <p>
 * Note that acess to some telephony information is
 * permission-protected. Your application cannot access the protected 
 * information unless it has the appropriate permissions declared in 
 * its manifest file. Where permissions apply, they are noted in the  
 * the methods through which you access the protected information. 
 */
public class TelephonyManager {
    private static final String TAG = "TelephonyManager";

    private Context mContext;
    private ITelephonyRegistry mRegistry;

    /** @hide */
    public TelephonyManager(Context context) {
        mContext = context;
        mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService(
                    "telephony.registry"));
    }

    /** @hide */
    private TelephonyManager() {
    }

    private static TelephonyManager sInstance = new TelephonyManager();

    /** @hide */
    public static TelephonyManager getDefault() {
        return sInstance;
    }


    //
    // Broadcast Intent actions
    //

    /**
     * Broadcast intent action indicating that the call state (cellular)
     * on the device has changed.
     *
     * <p>
     * The {@link #EXTRA_STATE} extra indicates the new call state.
     * If the new state is RINGING, a second extra
     * {@link #EXTRA_INCOMING_NUMBER} provides the incoming phone number as
     * a String.
     *
     * <p class="note">
     * Requires the READ_PHONE_STATE permission.
     *
     * <p class="note">
     * This was a {@link android.content.Context#sendStickyBroadcast sticky}
     * broadcast in version 1.0, but it is no longer sticky.
     * Instead, use {@link #getCallState} to synchronously query the current call state.
     *
     * @see #EXTRA_STATE
     * @see #EXTRA_INCOMING_NUMBER
     * @see #getCallState
     * 
     * @hide pending API Council approval
     */
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_PHONE_STATE_CHANGED =
            "android.intent.action.PHONE_STATE";

    /**
     * The lookup key used with the {@link #ACTION_PHONE_STATE_CHANGED} broadcast
     * for a String containing the new call state.
     *
     * @see #EXTRA_STATE_IDLE
     * @see #EXTRA_STATE_RINGING
     * @see #EXTRA_STATE_OFFHOOK
     *
     * <p class="note">
     * Retrieve with
     * {@link android.content.Intent#getStringExtra(String)}.
     * 
     * @hide pending API Council approval
     */
    public static final String EXTRA_STATE = Phone.STATE_KEY;

    /**
     * Value used with {@link #EXTRA_STATE} corresponding to
     * {@link #CALL_STATE_IDLE}.
     * 
     * @hide pending API Council approval
     */
    public static final String EXTRA_STATE_IDLE = Phone.State.IDLE.toString();

    /**
     * Value used with {@link #EXTRA_STATE} corresponding to
     * {@link #CALL_STATE_RINGING}.
     * 
     * @hide pending API Council approval
     */
    public static final String EXTRA_STATE_RINGING = Phone.State.RINGING.toString();

    /**
     * Value used with {@link #EXTRA_STATE} corresponding to
     * {@link #CALL_STATE_OFFHOOK}.
     * 
     * @hide pending API Council approval
     */
    public static final String EXTRA_STATE_OFFHOOK = Phone.State.OFFHOOK.toString();

    /**
     * The lookup key used with the {@link #ACTION_PHONE_STATE_CHANGED} broadcast
     * for a String containing the incoming phone number.
     * Only valid when the new call state is RINGING.
     *
     * <p class="note">
     * Retrieve with
     * {@link android.content.Intent#getStringExtra(String)}.
     * 
     * @hide pending API Council approval
     */
    public static final String EXTRA_INCOMING_NUMBER = "incoming_number";


    //
    //
    // Device Info
    //
    //

    /**
     * Returns the software version number for the device, for example, 
     * the IMEI/SV for GSM phones.
     *
     * <p>Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getDeviceSoftwareVersion() {
        try {
            return getSubscriberInfo().getDeviceSvn();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Returns the unique device ID, for example,the IMEI for GSM
     * phones.
     *
     * <p>Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getDeviceId() {
        try {
            return getSubscriberInfo().getDeviceId();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Returns the current location of the device.
     *
     * <p>Requires Permission: {@link android.Manifest.permission#ACCESS_COARSE_LOCATION
     * ACCESS_COARSE_LOCATION}.
     */
    public CellLocation getCellLocation() {
        try {
            Bundle bundle = getITelephony().getCellLocation();
            return CellLocation.newFromBundle(bundle);
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Enables location update notifications.  {@link PhoneStateListener#onCellLocationChanged
     * PhoneStateListener.onCellLocationChanged} will be called on location updates.
     *
     * <p>Requires Permission: {@link android.Manifest.permission#CONTROL_LOCATION_UPDATES 
     * CONTROL_LOCATION_UPDATES}
     *
     * @hide
     */
    public void enableLocationUpdates() {
        try {
            getITelephony().enableLocationUpdates();
        } catch (RemoteException ex) {
        }
    }

    /**
     * Disables location update notifications.  {@link PhoneStateListener#onCellLocationChanged
     * PhoneStateListener.onCellLocationChanged} will be called on location updates.
     *
     * <p>Requires Permission: {@link android.Manifest.permission#CONTROL_LOCATION_UPDATES
     * CONTROL_LOCATION_UPDATES}
     *
     * @hide
     */
    public void disableLocationUpdates() {
        try {
            getITelephony().disableLocationUpdates();
        } catch (RemoteException ex) {
        }
    }

    /**
     * Returns the neighboring cell information of the device.
     * 
     * @return List of NeighboringCellInfo or null if info unavailable.
     * 
     * <p>Requires Permission: 
     * (@link android.Manifest.permission#ACCESS_COARSE_UPDATES}
     */
    public List<NeighboringCellInfo> getNeighboringCellInfo() {
       try {
           return getITelephony().getNeighboringCellInfo();
       } catch (RemoteException ex) {
       }
       return null;
       
    }
    
    /**
     * No phone module
     */
    public static final int PHONE_TYPE_NONE = 0;

    /**
     * GSM phone
     */
    public static final int PHONE_TYPE_GSM = 1;

    /**
     * Returns a constant indicating the device phone type. 
     * 
     * @see #PHONE_TYPE_NONE
     * @see #PHONE_TYPE_GSM
     */
    public int getPhoneType() {
        // in the future, we should really check this
        return PHONE_TYPE_GSM;
    }

    //
    // 
    // Current Network
    //
    //

    /** 
     * Returns the alphabetic name of current registered operator.
     * <p>
     * Availability: Only when user is registered to a network
     */
    public String getNetworkOperatorName() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_ALPHA);
    }

    /** 
     * Returns the numeric name (MCC+MNC) of current registered operator.
     * <p>
     * Availability: Only when user is registered to a network
     */
    public String getNetworkOperator() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_NUMERIC);
    }

    /**  
     * Returns true if the device is considered roaming on the current
     * network, for GSM purposes.
     * <p>
     * Availability: Only when user registered to a network
     */
    public boolean isNetworkRoaming() {
        return "true".equals(SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_ISROAMING));
    }

    /** 
     * Returns the ISO country code equivilent of the current registered
     * operator's MCC (Mobile Country Code).
     * <p>
     * Availability: Only when user is registered to a network
     */
    public String getNetworkCountryIso() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_ISO_COUNTRY);
    }

    /** Network type is unknown */
    public static final int NETWORK_TYPE_UNKNOWN = 0;
    /** Current network is GPRS */
    public static final int NETWORK_TYPE_GPRS = 1;
    /** Current network is EDGE */
    public static final int NETWORK_TYPE_EDGE = 2;
    /** Current network is UMTS */
    public static final int NETWORK_TYPE_UMTS = 3;

    /**
     * Returns a constant indicating the radio technology (network type) 
     * currently in use on the device.
     * @return the network type
     *
     * @see #NETWORK_TYPE_UNKNOWN
     * @see #NETWORK_TYPE_GPRS
     * @see #NETWORK_TYPE_EDGE
     * @see #NETWORK_TYPE_UMTS
     */
    public int getNetworkType() {
        String prop = SystemProperties.get(TelephonyProperties.PROPERTY_DATA_NETWORK_TYPE);
        if ("GPRS".equals(prop)) {
            return NETWORK_TYPE_GPRS;
        }
        else if ("EDGE".equals(prop)) {
            return NETWORK_TYPE_EDGE;
        }
        else if ("UMTS".equals(prop)) {
            return NETWORK_TYPE_UMTS;
        }
        else {
            return NETWORK_TYPE_UNKNOWN;
        }
    }

    /**
     * Returns a string representation of the radio technology (network type)
     * currently in use on the device.
     * @return the name of the radio technology
     *
     * @hide pending API council review
     */
    public String getNetworkTypeName() {
        switch (getNetworkType()) {
            case NETWORK_TYPE_GPRS:
                return "GPRS";
            case NETWORK_TYPE_EDGE:
                return "EDGE";
            case NETWORK_TYPE_UMTS:
                return "UMTS";
            default:
                return "UNKNOWN";
        }
    }

    //
    //
    // SIM Card
    //
    //

    /** SIM card state: Unknown. Signifies that the SIM is in transition
     *  between states. For example, when the user inputs the SIM pin
     *  under PIN_REQUIRED state, a query for sim status returns 
     *  this state before turning to SIM_STATE_READY. */
    public static final int SIM_STATE_UNKNOWN = 0;
    /** SIM card state: no SIM card is available in the device */
    public static final int SIM_STATE_ABSENT = 1;
    /** SIM card state: Locked: requires the user's SIM PIN to unlock */
    public static final int SIM_STATE_PIN_REQUIRED = 2;
    /** SIM card state: Locked: requires the user's SIM PUK to unlock */
    public static final int SIM_STATE_PUK_REQUIRED = 3;
    /** SIM card state: Locked: requries a network PIN to unlock */
    public static final int SIM_STATE_NETWORK_LOCKED = 4;
    /** SIM card state: Ready */
    public static final int SIM_STATE_READY = 5;
    
    /** 
     * Returns a constant indicating the state of the 
     * device SIM card.
     * 
     * @see #SIM_STATE_UNKNOWN
     * @see #SIM_STATE_ABSENT
     * @see #SIM_STATE_PIN_REQUIRED
     * @see #SIM_STATE_PUK_REQUIRED
     * @see #SIM_STATE_NETWORK_LOCKED
     * @see #SIM_STATE_READY
     */
    public int getSimState() {
        String prop = SystemProperties.get(TelephonyProperties.PROPERTY_SIM_STATE);
        if ("ABSENT".equals(prop)) {
            return SIM_STATE_ABSENT;
        }
        else if ("PIN_REQUIRED".equals(prop)) {
            return SIM_STATE_PIN_REQUIRED;
        }
        else if ("PUK_REQUIRED".equals(prop)) {
            return SIM_STATE_PUK_REQUIRED;
        }
        else if ("NETWORK_LOCKED".equals(prop)) {
            return SIM_STATE_NETWORK_LOCKED;
        }
        else if ("READY".equals(prop)) {
            return SIM_STATE_READY;
        }
        else {
            return SIM_STATE_UNKNOWN;
        }
    }

    /** 
     * Returns the MCC+MNC (mobile country code + mobile network code) of the
     * provider of the SIM. 5 or 6 decimal digits.
     * <p>
     * Availability: SIM state must be {@link #SIM_STATE_READY}
     *
     * @see #getSimState
     */
    public String getSimOperator() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_SIM_OPERATOR_NUMERIC);
    }

    /** 
     * Returns the Service Provider Name (SPN). 
     * <p>
     * Availability: SIM state must be {@link #SIM_STATE_READY}
     *
     * @see #getSimState
     */
    public String getSimOperatorName() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_SIM_OPERATOR_ALPHA);
    }

    /** 
     * Returns the ISO country code equivalent for the SIM provider's country code.
     */
    public String getSimCountryIso() {
        return SystemProperties.get(TelephonyProperties.PROPERTY_SIM_OPERATOR_ISO_COUNTRY);
    }

    /**
     * Returns the serial number of the SIM, if applicable.
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getSimSerialNumber() {
        try {
            return getSubscriberInfo().getSimSerialNumber();
        } catch (RemoteException ex) {
        }
        return null;
    }

    //
    //
    // Subscriber Info
    //
    //

    /**
     * Returns the unique subscriber ID, for example, the IMSI for a GSM phone.
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getSubscriberId() {
        try {
            return getSubscriberInfo().getSubscriberId();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Returns the phone number string for line 1, for example, the MSISDN 
     * for a GSM phone.
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getLine1Number() {
        try {
            return getSubscriberInfo().getLine1Number();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Returns the alphabetic identifier associated with the line 1 number. 
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     * @hide
     * nobody seems to call this.
     */
    public String getLine1AlphaTag() {
        try {
            return getSubscriberInfo().getLine1AlphaTag();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Returns the voice mail number.
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getVoiceMailNumber() {
        try {
            return getSubscriberInfo().getVoiceMailNumber();
        } catch (RemoteException ex) {
        }
        return null;
    }

    /**
     * Retrieves the alphabetic identifier associated with the voice
     * mail number.
     * <p>
     * Requires Permission: 
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    public String getVoiceMailAlphaTag() {
        try {
            return getSubscriberInfo().getVoiceMailAlphaTag();
        } catch (RemoteException ex) {
        }
        return null;
    }

    private IPhoneSubInfo getSubscriberInfo() {
        // get it each time because that process crashes a lot
        return IPhoneSubInfo.Stub.asInterface(ServiceManager.getService("iphonesubinfo"));
    }


    /** Device call state: No activity. */
    public static final int CALL_STATE_IDLE = 0;
    /** Device call state: Ringing. A new call arrived and is
     *  ringing or waiting. In the latter case, another call is 
     *  already active. */
    public static final int CALL_STATE_RINGING = 1;
    /** Device call state: Off-hook. At least one call exists 
      * that is dialing, active, or on hold, and no calls are ringing
      * or waiting. */
    public static final int CALL_STATE_OFFHOOK = 2;

    /**
     * Returns a constant indicating the call state (cellular) on the device.
     */
    public int getCallState() {
        try {
            return getITelephony().getCallState();
        } catch (RemoteException ex) {
            // the phone process is restarting.
            return CALL_STATE_IDLE;
        }
    }

    /** Data connection activity: No traffic. */
    public static final int DATA_ACTIVITY_NONE = 0x00000000;
    /** Data connection activity: Currently receiving IP PPP traffic. */
    public static final int DATA_ACTIVITY_IN = 0x00000001;
    /** Data connection activity: Currently sending IP PPP traffic. */
    public static final int DATA_ACTIVITY_OUT = 0x00000002;
    /** Data connection activity: Currently both sending and receiving
     *  IP PPP traffic. */
    public static final int DATA_ACTIVITY_INOUT = DATA_ACTIVITY_IN | DATA_ACTIVITY_OUT;

    /**
     * Returns a constant indicating the type of activity on a data connection
     * (cellular).
     *
     * @see #DATA_ACTIVITY_NONE
     * @see #DATA_ACTIVITY_IN
     * @see #DATA_ACTIVITY_OUT
     * @see #DATA_ACTIVITY_INOUT
     */
    public int getDataActivity() {
        try {
            return getITelephony().getDataActivity();
        } catch (RemoteException ex) {
            // the phone process is restarting.
            return DATA_ACTIVITY_NONE;
        }
    }

    /** Data connection state: Disconnected. IP traffic not available. */
    public static final int DATA_DISCONNECTED   = 0;
    /** Data connection state: Currently setting up a data connection. */
    public static final int DATA_CONNECTING     = 1;
    /** Data connection state: Connected. IP traffic should be available. */
    public static final int DATA_CONNECTED      = 2;
    /** Data connection state: Suspended. The connection is up, but IP 
     * traffic is temporarily unavailable. For example, in a 2G network, 
     * data activity may be suspended when a voice call arrives. */
    public static final int DATA_SUSPENDED      = 3;

    /**
     * Returns a constant indicating the current data connection state 
     * (cellular).
     *
     * @see #DATA_DISCONNECTED
     * @see #DATA_CONNECTING
     * @see #DATA_CONNECTED
     * @see #DATA_SUSPENDED
     */
    public int getDataState() {
        try {
            return getITelephony().getDataState();
        } catch (RemoteException ex) {
            // the phone process is restarting.
            return DATA_DISCONNECTED;
        }
    }

    private ITelephony getITelephony() {
        return ITelephony.Stub.asInterface(ServiceManager.getService(Context.TELEPHONY_SERVICE));
    }

    //
    //
    // PhoneStateListener
    //
    //

    /**
     * Registers a listener object to receive notification of changes 
     * in specified telephony states. 
     * <p>
     * To register a listener, pass a {@link PhoneStateListener}
     * and specify at least one telephony state of interest in 
     * the events argument. 
     * 
     * At registration, and when a specified telephony state
     * changes, the telephony manager invokes the appropriate 
     * callback method on the listener object and passes the 
     * current (udpated) values.
     * <p>
     * To unregister a listener, pass the listener object and set the
     * events argument to 
     * {@link PhoneStateListener#LISTEN_NONE LISTEN_NONE} (0).
     * 
     * @param listener The {@link PhoneStateListener} object to register
     *                 (or unregister)
     * @param events The telephony state(s) of interest to the listener,
     *               as a bitwise-OR combination of {@link PhoneStateListener} 
     *               LISTEN_ flags.
     */
    public void listen(PhoneStateListener listener, int events) {
        String pkgForDebug = mContext != null ? mContext.getPackageName() : "<unknown>";
        try {
            Boolean notifyNow = (getITelephony() != null);
            mRegistry.listen(pkgForDebug, listener.callback, events, notifyNow);
        } catch (RemoteException ex) {
            // system process dead
        }
    }
}