package com.android.phone;

import com.android.internal.telephony.CallForwardInfo;
import com.android.internal.telephony.CommandException;
import com.android.internal.telephony.CommandsInterface;
import com.android.internal.telephony.Phone;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.os.AsyncResult;
import android.os.Handler;
import android.os.Message;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import android.text.BidiFormatter;
import android.text.SpannableString;
import android.text.TextDirectionHeuristics;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

import static com.android.phone.TimeConsumingPreferenceActivity.RESPONSE_ERROR;
import static com.android.phone.TimeConsumingPreferenceActivity.EXCEPTION_ERROR;

public class CallForwardEditPreference extends EditPhoneNumberPreference {
    private static final String LOG_TAG = "CallForwardEditPreference";

    private static final String SRC_TAGS[]       = {"{0}"};
    private CharSequence mSummaryOnTemplate;
    /**
     * Remembers which button was clicked by a user. If no button is clicked yet, this should have
     * {@link DialogInterface#BUTTON_NEGATIVE}, meaning "cancel".
     *
     * TODO: consider removing this variable and having getButtonClicked() in
     * EditPhoneNumberPreference instead.
     */
    private int mButtonClicked;
    private int mServiceClass;
    private MyHandler mHandler = new MyHandler();
    int reason;
    private Phone mPhone;
    CallForwardInfo callForwardInfo;
    private TimeConsumingPreferenceListener mTcpListener;
    // Should we replace CF queries containing an invalid number with "Voicemail"
    private boolean mReplaceInvalidCFNumber = false;

    public CallForwardEditPreference(Context context, AttributeSet attrs) {
        super(context, attrs);

        mSummaryOnTemplate = this.getSummaryOn();

        TypedArray a = context.obtainStyledAttributes(attrs,
                R.styleable.CallForwardEditPreference, 0, R.style.EditPhoneNumberPreference);
        mServiceClass = a.getInt(R.styleable.CallForwardEditPreference_serviceClass,
                CommandsInterface.SERVICE_CLASS_VOICE);
        reason = a.getInt(R.styleable.CallForwardEditPreference_reason,
                CommandsInterface.CF_REASON_UNCONDITIONAL);
        a.recycle();

        Log.d(LOG_TAG, "mServiceClass=" + mServiceClass + ", reason=" + reason);
    }

    public CallForwardEditPreference(Context context) {
        this(context, null);
    }

    void init(TimeConsumingPreferenceListener listener, boolean skipReading, Phone phone,
            boolean replaceInvalidCFNumber) {
        mPhone = phone;
        mTcpListener = listener;
        mReplaceInvalidCFNumber = replaceInvalidCFNumber;

        if (!skipReading) {
            mPhone.getCallForwardingOption(reason,
                    mHandler.obtainMessage(MyHandler.MESSAGE_GET_CF,
                            // unused in this case
                            CommandsInterface.CF_ACTION_DISABLE,
                            MyHandler.MESSAGE_GET_CF, null));
            if (mTcpListener != null) {
                mTcpListener.onStarted(this, true);
            }
        }
    }

    @Override
    protected void onBindDialogView(View view) {
        // default the button clicked to be the cancel button.
        mButtonClicked = DialogInterface.BUTTON_NEGATIVE;
        super.onBindDialogView(view);
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        super.onClick(dialog, which);
        mButtonClicked = which;
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);

        Log.d(LOG_TAG, "mButtonClicked=" + mButtonClicked + ", positiveResult=" + positiveResult);
        // Ignore this event if the user clicked the cancel button, or if the dialog is dismissed
        // without any button being pressed (back button press or click event outside the dialog).
        if (this.mButtonClicked != DialogInterface.BUTTON_NEGATIVE) {
            int action = (isToggled() || (mButtonClicked == DialogInterface.BUTTON_POSITIVE)) ?
                    CommandsInterface.CF_ACTION_REGISTRATION :
                    CommandsInterface.CF_ACTION_DISABLE;
            int time = (reason != CommandsInterface.CF_REASON_NO_REPLY) ? 0 : 20;
            final String number = getPhoneNumber();

            Log.d(LOG_TAG, "callForwardInfo=" + callForwardInfo);

            if (action == CommandsInterface.CF_ACTION_REGISTRATION
                    && callForwardInfo != null
                    && callForwardInfo.status == 1
                    && number.equals(callForwardInfo.number)) {
                // no change, do nothing
                Log.d(LOG_TAG, "no change, do nothing");
            } else {
                // set to network
                Log.d(LOG_TAG, "reason=" + reason + ", action=" + action
                        + ", number=" + number);

                // Display no forwarding number while we're waiting for
                // confirmation
                setSummaryOn("");

                // the interface of Phone.setCallForwardingOption has error:
                // should be action, reason...
                mPhone.setCallForwardingOption(action,
                        reason,
                        number,
                        time,
                        mHandler.obtainMessage(MyHandler.MESSAGE_SET_CF,
                                action,
                                MyHandler.MESSAGE_SET_CF));

                if (mTcpListener != null) {
                    mTcpListener.onStarted(this, false);
                }
            }
        }
    }

    void handleCallForwardResult(CallForwardInfo cf) {
        callForwardInfo = cf;
        Log.d(LOG_TAG, "handleGetCFResponse done, callForwardInfo=" + callForwardInfo);
        // In some cases, the network can send call forwarding URIs for voicemail that violate the
        // 3gpp spec. This can cause us to receive "numbers" that are sequences of letters. In this
        // case, we must detect these series of characters and replace them with "Voicemail".
        // PhoneNumberUtils#formatNumber returns null if the number is not valid.
        if (mReplaceInvalidCFNumber && (PhoneNumberUtils.formatNumber(callForwardInfo.number,
                getCurrentCountryIso()) == null)) {
            callForwardInfo.number = getContext().getString(R.string.voicemail);
            Log.i(LOG_TAG, "handleGetCFResponse: Overridding CF number");
        }

        setToggled(callForwardInfo.status == 1);
        setPhoneNumber(callForwardInfo.number);
    }

    private void updateSummaryText() {
        if (isToggled()) {
            final String number = getRawPhoneNumber();
            if (number != null && number.length() > 0) {
                // Wrap the number to preserve presentation in RTL languages.
                String wrappedNumber = BidiFormatter.getInstance().unicodeWrap(
                        number, TextDirectionHeuristics.LTR);
                String values[] = { wrappedNumber };
                String summaryOn = String.valueOf(
                        TextUtils.replace(mSummaryOnTemplate, SRC_TAGS, values));
                int start = summaryOn.indexOf(wrappedNumber);

                SpannableString spannableSummaryOn = new SpannableString(summaryOn);
                PhoneNumberUtils.addTtsSpan(spannableSummaryOn,
                        start, start + wrappedNumber.length());
                setSummaryOn(spannableSummaryOn);
            } else {
                setSummaryOn(getContext().getString(R.string.sum_cfu_enabled_no_number));
            }
        }

    }

    /**
     * @return The ISO 3166-1 two letters country code of the country the user is in based on the
     *      network location.
     */
    private String getCurrentCountryIso() {
        final TelephonyManager telephonyManager =
                (TelephonyManager) getContext().getSystemService(Context.TELEPHONY_SERVICE);
        if (telephonyManager == null) {
            return "";
        }
        return telephonyManager.getNetworkCountryIso().toUpperCase();
    }

    // Message protocol:
    // what: get vs. set
    // arg1: action -- register vs. disable
    // arg2: get vs. set for the preceding request
    private class MyHandler extends Handler {
        static final int MESSAGE_GET_CF = 0;
        static final int MESSAGE_SET_CF = 1;

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MESSAGE_GET_CF:
                    handleGetCFResponse(msg);
                    break;
                case MESSAGE_SET_CF:
                    handleSetCFResponse(msg);
                    break;
            }
        }

        private void handleGetCFResponse(Message msg) {
            Log.d(LOG_TAG, "handleGetCFResponse: done");

            mTcpListener.onFinished(CallForwardEditPreference.this, msg.arg2 != MESSAGE_SET_CF);

            AsyncResult ar = (AsyncResult) msg.obj;

            callForwardInfo = null;
            if (ar.exception != null) {
                Log.d(LOG_TAG, "handleGetCFResponse: ar.exception=" + ar.exception);
                if (ar.exception instanceof CommandException) {
                    mTcpListener.onException(CallForwardEditPreference.this,
                            (CommandException) ar.exception);
                } else {
                    // Most likely an ImsException and we can't handle it the same way as
                    // a CommandException. The best we can do is to handle the exception
                    // the same way as mTcpListener.onException() does when it is not of type
                    // FDN_CHECK_FAILURE.
                    mTcpListener.onError(CallForwardEditPreference.this, EXCEPTION_ERROR);
                }
            } else {
                if (ar.userObj instanceof Throwable) {
                    mTcpListener.onError(CallForwardEditPreference.this, RESPONSE_ERROR);
                }
                CallForwardInfo cfInfoArray[] = (CallForwardInfo[]) ar.result;
                if (cfInfoArray.length == 0) {
                    Log.d(LOG_TAG, "handleGetCFResponse: cfInfoArray.length==0");
                    setEnabled(false);
                    mTcpListener.onError(CallForwardEditPreference.this, RESPONSE_ERROR);
                } else {
                    for (int i = 0, length = cfInfoArray.length; i < length; i++) {
                        Log.d(LOG_TAG, "handleGetCFResponse, cfInfoArray[" + i + "]="
                                + cfInfoArray[i]);
                        if ((mServiceClass & cfInfoArray[i].serviceClass) != 0) {
                            // corresponding class
                            CallForwardInfo info = cfInfoArray[i];
                            handleCallForwardResult(info);

                            // Show an alert if we got a success response but
                            // with unexpected values.
                            // Currently only handle the fail-to-disable case
                            // since we haven't observed fail-to-enable.
                            if (msg.arg2 == MESSAGE_SET_CF &&
                                    msg.arg1 == CommandsInterface.CF_ACTION_DISABLE &&
                                    info.status == 1) {
                                CharSequence s;
                                switch (reason) {
                                    case CommandsInterface.CF_REASON_BUSY:
                                        s = getContext().getText(R.string.disable_cfb_forbidden);
                                        break;
                                    case CommandsInterface.CF_REASON_NO_REPLY:
                                        s = getContext().getText(R.string.disable_cfnry_forbidden);
                                        break;
                                    default: // not reachable
                                        s = getContext().getText(R.string.disable_cfnrc_forbidden);
                                }
                                AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
                                builder.setNeutralButton(R.string.close_dialog, null);
                                builder.setTitle(getContext().getText(R.string.error_updating_title));
                                builder.setMessage(s);
                                builder.setCancelable(true);
                                builder.create().show();
                            }
                        }
                    }
                }
            }

            // Now whether or not we got a new number, reset our enabled
            // summary text since it may have been replaced by an empty
            // placeholder.
            updateSummaryText();
        }

        private void handleSetCFResponse(Message msg) {
            AsyncResult ar = (AsyncResult) msg.obj;

            if (ar.exception != null) {
                Log.d(LOG_TAG, "handleSetCFResponse: ar.exception=" + ar.exception);
                // setEnabled(false);
            }
            Log.d(LOG_TAG, "handleSetCFResponse: re get");
            mPhone.getCallForwardingOption(reason,
                    obtainMessage(MESSAGE_GET_CF, msg.arg1, MESSAGE_SET_CF, ar.exception));
        }
    }
}