/*
 * Copyright (C) 2006 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.internal.telephony;

import android.content.Context;
import android.os.AsyncResult;
import android.os.Handler;
import android.os.Message;
import android.os.Registrant;
import android.os.RegistrantList;

import com.android.internal.telephony.gsm.UsimServiceTable;
import com.android.internal.telephony.ims.IsimRecords;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * {@hide}
 */
public abstract class IccRecords extends Handler implements IccConstants {

    protected static final boolean DBG = true;
    // ***** Instance Variables
    protected AtomicBoolean mDestroyed = new AtomicBoolean(false);
    protected Context mContext;
    protected CommandsInterface mCi;
    protected IccFileHandler mFh;
    protected UiccCardApplication mParentApp;

    protected RegistrantList recordsLoadedRegistrants = new RegistrantList();
    protected RegistrantList mImsiReadyRegistrants = new RegistrantList();
    protected RegistrantList mRecordsEventsRegistrants = new RegistrantList();
    protected RegistrantList mNewSmsRegistrants = new RegistrantList();
    protected RegistrantList mNetworkSelectionModeAutomaticRegistrants = new RegistrantList();

    protected int recordsToLoad;  // number of pending load requests

    protected AdnRecordCache adnCache;

    // ***** Cached SIM State; cleared on channel close

    protected boolean recordsRequested = false; // true if we've made requests for the sim records

    public String iccid;
    protected String msisdn = null;  // My mobile number
    protected String msisdnTag = null;
    protected String voiceMailNum = null;
    protected String voiceMailTag = null;
    protected String newVoiceMailNum = null;
    protected String newVoiceMailTag = null;
    protected boolean isVoiceMailFixed = false;
    protected int countVoiceMessages = 0;
    protected String mImsi;

    protected int mncLength = UNINITIALIZED;
    protected int mailboxIndex = 0; // 0 is no mailbox dailing number associated

    protected String spn;

    // ***** Constants

    // Markers for mncLength
    protected static final int UNINITIALIZED = -1;
    protected static final int UNKNOWN = 0;

    // Bitmasks for SPN display rules.
    protected static final int SPN_RULE_SHOW_SPN  = 0x01;
    protected static final int SPN_RULE_SHOW_PLMN = 0x02;

    // ***** Event Constants
    protected static final int EVENT_SET_MSISDN_DONE = 30;
    public static final int EVENT_MWI = 0; // Message Waiting indication
    public static final int EVENT_CFI = 1; // Call Forwarding indication
    public static final int EVENT_SPN = 2; // Service Provider Name

    public static final int EVENT_GET_ICC_RECORD_DONE = 100;

    /**
     * Generic ICC record loaded callback. Subclasses can call EF load methods on
     * {@link IccFileHandler} passing a Message for onLoaded with the what field set to
     * {@link #EVENT_GET_ICC_RECORD_DONE} and the obj field set to an instance
     * of this interface. The {@link #handleMessage} method in this class will print a
     * log message using {@link #getEfName()} and decrement {@link #recordsToLoad}.
     *
     * If the record load was successful, {@link #onRecordLoaded} will be called with the result.
     * Otherwise, an error log message will be output by {@link #handleMessage} and
     * {@link #onRecordLoaded} will not be called.
     */
    public interface IccRecordLoaded {
        String getEfName();
        void onRecordLoaded(AsyncResult ar);
    }

    // ***** Constructor
    public IccRecords(UiccCardApplication app, Context c, CommandsInterface ci) {
        mContext = c;
        mCi = ci;
        mFh = app.getIccFileHandler();
        mParentApp = app;
    }

    /**
     * Call when the IccRecords object is no longer going to be used.
     */
    public void dispose() {
        mDestroyed.set(true);
        mParentApp = null;
        mFh = null;
        mCi = null;
        mContext = null;
    }

    public abstract void onReady();

    //***** Public Methods
    public AdnRecordCache getAdnCache() {
        return adnCache;
    }

    public void registerForRecordsLoaded(Handler h, int what, Object obj) {
        if (mDestroyed.get()) {
            return;
        }

        Registrant r = new Registrant(h, what, obj);
        recordsLoadedRegistrants.add(r);

        if (recordsToLoad == 0 && recordsRequested == true) {
            r.notifyRegistrant(new AsyncResult(null, null, null));
        }
    }
    public void unregisterForRecordsLoaded(Handler h) {
        recordsLoadedRegistrants.remove(h);
    }

    public void registerForImsiReady(Handler h, int what, Object obj) {
        if (mDestroyed.get()) {
            return;
        }

        Registrant r = new Registrant(h, what, obj);
        mImsiReadyRegistrants.add(r);

        if (mImsi != null) {
            r.notifyRegistrant(new AsyncResult(null, null, null));
        }
    }
    public void unregisterForImsiReady(Handler h) {
        mImsiReadyRegistrants.remove(h);
    }

    public void registerForRecordsEvents(Handler h, int what, Object obj) {
        Registrant r = new Registrant (h, what, obj);
        mRecordsEventsRegistrants.add(r);
    }
    public void unregisterForRecordsEvents(Handler h) {
        mRecordsEventsRegistrants.remove(h);
    }

    public void registerForNewSms(Handler h, int what, Object obj) {
        Registrant r = new Registrant (h, what, obj);
        mNewSmsRegistrants.add(r);
    }
    public void unregisterForNewSms(Handler h) {
        mNewSmsRegistrants.remove(h);
    }

    public void registerForNetworkSelectionModeAutomatic(
            Handler h, int what, Object obj) {
        Registrant r = new Registrant (h, what, obj);
        mNetworkSelectionModeAutomaticRegistrants.add(r);
    }
    public void unregisterForNetworkSelectionModeAutomatic(Handler h) {
        mNetworkSelectionModeAutomaticRegistrants.remove(h);
    }

    /**
     * Get the International Mobile Subscriber ID (IMSI) on a SIM
     * for GSM, UMTS and like networks. Default is null if IMSI is
     * not supported or unavailable.
     *
     * @return null if SIM is not yet ready or unavailable
     */
    public String getIMSI() {
        return null;
    }

    /**
     * Imsi could be set by ServiceStateTrackers in case of cdma
     * @param imsi
     */
    public void setImsi(String imsi) {
        this.mImsi = imsi;
        mImsiReadyRegistrants.notifyRegistrants();
    }

    public String getMsisdnNumber() {
        return msisdn;
    }

    /**
     * Set subscriber number to SIM record
     *
     * The subscriber number is stored in EF_MSISDN (TS 51.011)
     *
     * When the operation is complete, onComplete will be sent to its handler
     *
     * @param alphaTag alpha-tagging of the dailing nubmer (up to 10 characters)
     * @param number dailing nubmer (up to 20 digits)
     *        if the number starts with '+', then set to international TOA
     * @param onComplete
     *        onComplete.obj will be an AsyncResult
     *        ((AsyncResult)onComplete.obj).exception == null on success
     *        ((AsyncResult)onComplete.obj).exception != null on fail
     */
    public void setMsisdnNumber(String alphaTag, String number,
            Message onComplete) {

        msisdn = number;
        msisdnTag = alphaTag;

        if(DBG) log("Set MSISDN: " + msisdnTag +" " + msisdn);


        AdnRecord adn = new AdnRecord(msisdnTag, msisdn);

        new AdnRecordLoader(mFh).updateEF(adn, EF_MSISDN, EF_EXT1, 1, null,
                obtainMessage(EVENT_SET_MSISDN_DONE, onComplete));
    }

    public String getMsisdnAlphaTag() {
        return msisdnTag;
    }

    public String getVoiceMailNumber() {
        return voiceMailNum;
    }

    /**
     * Return Service Provider Name stored in SIM (EF_SPN=0x6F46) or in RUIM (EF_RUIM_SPN=0x6F41)
     * @return null if SIM is not yet ready or no RUIM entry
     */
    public String getServiceProviderName() {
        return spn;
    }

    /**
     * Set voice mail number to SIM record
     *
     * The voice mail number can be stored either in EF_MBDN (TS 51.011) or
     * EF_MAILBOX_CPHS (CPHS 4.2)
     *
     * If EF_MBDN is available, store the voice mail number to EF_MBDN
     *
     * If EF_MAILBOX_CPHS is enabled, store the voice mail number to EF_CHPS
     *
     * So the voice mail number will be stored in both EFs if both are available
     *
     * Return error only if both EF_MBDN and EF_MAILBOX_CPHS fail.
     *
     * When the operation is complete, onComplete will be sent to its handler
     *
     * @param alphaTag alpha-tagging of the dailing nubmer (upto 10 characters)
     * @param voiceNumber dailing nubmer (upto 20 digits)
     *        if the number is start with '+', then set to international TOA
     * @param onComplete
     *        onComplete.obj will be an AsyncResult
     *        ((AsyncResult)onComplete.obj).exception == null on success
     *        ((AsyncResult)onComplete.obj).exception != null on fail
     */
    public abstract void setVoiceMailNumber(String alphaTag, String voiceNumber,
            Message onComplete);

    public String getVoiceMailAlphaTag() {
        return voiceMailTag;
    }

    /**
     * Sets the SIM voice message waiting indicator records
     * @param line GSM Subscriber Profile Number, one-based. Only '1' is supported
     * @param countWaiting The number of messages waiting, if known. Use
     *                     -1 to indicate that an unknown number of
     *                      messages are waiting
     */
    public abstract void setVoiceMessageWaiting(int line, int countWaiting);

    /** @return  true if there are messages waiting, false otherwise. */
    public boolean getVoiceMessageWaiting() {
        return countVoiceMessages != 0;
    }

    /**
     * Returns number of voice messages waiting, if available
     * If not available (eg, on an older CPHS SIM) -1 is returned if
     * getVoiceMessageWaiting() is true
     */
    public int getVoiceMessageCount() {
        return countVoiceMessages;
    }

    /**
     * Called by STK Service when REFRESH is received.
     * @param fileChanged indicates whether any files changed
     * @param fileList if non-null, a list of EF files that changed
     */
    public abstract void onRefresh(boolean fileChanged, int[] fileList);


    public boolean getRecordsLoaded() {
        if (recordsToLoad == 0 && recordsRequested == true) {
            return true;
        } else {
            return false;
        }
    }

    //***** Overridden from Handler
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case EVENT_GET_ICC_RECORD_DONE:
                try {
                    AsyncResult ar = (AsyncResult) msg.obj;
                    IccRecordLoaded recordLoaded = (IccRecordLoaded) ar.userObj;
                    if (DBG) log(recordLoaded.getEfName() + " LOADED");

                    if (ar.exception != null) {
                        loge("Record Load Exception: " + ar.exception);
                    } else {
                        recordLoaded.onRecordLoaded(ar);
                    }
                }catch (RuntimeException exc) {
                    // I don't want these exceptions to be fatal
                    loge("Exception parsing SIM record: " + exc);
                } finally {
                    // Count up record load responses even if they are fails
                    onRecordLoaded();
                }
                break;

            default:
                super.handleMessage(msg);
        }
    }

    protected abstract void onRecordLoaded();

    protected abstract void onAllRecordsLoaded();

    /**
     * Returns the SpnDisplayRule based on settings on the SIM and the
     * specified plmn (currently-registered PLMN).  See TS 22.101 Annex A
     * and TS 51.011 10.3.11 for details.
     *
     * If the SPN is not found on the SIM, the rule is always PLMN_ONLY.
     * Generally used for GSM/UMTS and the like SIMs.
     */
    public abstract int getDisplayRule(String plmn);

    /**
     * Return true if "Restriction of menu options for manual PLMN selection"
     * bit is set or EF_CSP data is unavailable, return false otherwise.
     * Generally used for GSM/UMTS and the like SIMs.
     */
    public boolean isCspPlmnEnabled() {
        return false;
    }

    /**
     * Returns the 5 or 6 digit MCC/MNC of the operator that
     * provided the SIM card. Returns null of SIM is not yet ready
     * or is not valid for the type of IccCard. Generally used for
     * GSM/UMTS and the like SIMS
     */
    public String getOperatorNumeric() {
        return null;
    }

    /**
     * Get the current Voice call forwarding flag for GSM/UMTS and the like SIMs
     *
     * @return true if enabled
     */
    public boolean getVoiceCallForwardingFlag() {
        return false;
    }

    /**
     * Set the voice call forwarding flag for GSM/UMTS and the like SIMs
     *
     * @param line to enable/disable
     * @param enable
     */
    public void setVoiceCallForwardingFlag(int line, boolean enable) {
    }

    /**
     * Indicates wether SIM is in provisioned state or not.
     * Overridden only if SIM can be dynamically provisioned via OTA.
     *
     * @return true if provisioned
     */
    public boolean isProvisioned () {
        return true;
    }

    /**
     * Write string to log file
     *
     * @param s is the string to write
     */
    protected abstract void log(String s);

    /**
     * Write error string to log file.
     *
     * @param s is the string to write
     */
    protected abstract void loge(String s);

    /**
     * Return an interface to retrieve the ISIM records for IMS, if available.
     * @return the interface to retrieve the ISIM records, or null if not supported
     */
    public IsimRecords getIsimRecords() {
        return null;
    }

    public UsimServiceTable getUsimServiceTable() {
        return null;
    }
}