/*
 * 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.phone;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.AsyncResult;
import android.os.Handler;
import android.os.Message;
import android.os.SystemProperties;
import android.provider.Settings;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.TelephonyManager;

import com.android.internal.telephony.Phone;
import com.android.internal.telephony.TelephonyCapabilities;

import android.util.Log;

/*
 * Handles OTA Start procedure at phone power up. At phone power up, if phone is not OTA
 * provisioned (check MIN value of the Phone) and 'device_provisioned' is not set,
 * OTA Activation screen is shown that helps user activate the phone
 */
public class OtaStartupReceiver extends BroadcastReceiver {
    private static final String TAG = "OtaStartupReceiver";
    private static final boolean DBG = false;
    private static final int MIN_READY = 10;
    private static final int SERVICE_STATE_CHANGED = 11;
    private Context mContext;

    /**
     * For debug purposes we're listening for otaspChanged events as
     * this may be be used in the future for deciding if OTASP is
     * necessary.
     */
    private int mOtaspMode = -1;
    private boolean mPhoneStateListenerRegistered = false;
    private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
        @Override
        public void onOtaspChanged(int otaspMode) {
            mOtaspMode = otaspMode;
            Log.v(TAG, "onOtaspChanged: mOtaspMode=" + mOtaspMode);
        }
    };


    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MIN_READY:
                    Log.v(TAG, "Attempting OtaActivation from handler, mOtaspMode=" + mOtaspMode);
                    OtaUtils.maybeDoOtaCall(mContext, mHandler, MIN_READY);
                    break;
                case SERVICE_STATE_CHANGED: {
                    ServiceState state = (ServiceState) ((AsyncResult) msg.obj).result;
                    if (DBG) Log.d(TAG, "onServiceStateChanged()...  new state = " + state);

                    // Possible service states:
                    // - STATE_IN_SERVICE        // Normal operation
                    // - STATE_OUT_OF_SERVICE    // Still searching for an operator to register to,
                    //                           // or no radio signal
                    // - STATE_EMERGENCY_ONLY    // Phone is locked; only emergency numbers are allowed
                    // - STATE_POWER_OFF         // Radio is explicitly powered off (airplane mode)

                    // Once we reach STATE_IN_SERVICE
                    // it's finally OK to start OTA provisioning
                    if (state.getState() == ServiceState.STATE_IN_SERVICE) {
                        if (DBG) Log.d(TAG, "call OtaUtils.maybeDoOtaCall after network is available");
                        Phone phone = PhoneGlobals.getPhone();
                        phone.unregisterForServiceStateChanged(this);
                        OtaUtils.maybeDoOtaCall(mContext, mHandler, MIN_READY);
                    }
                    break;
                }
            }

        }
    };

    @Override
    public void onReceive(Context context, Intent intent) {
        mContext = context;
        if (DBG) {
            Log.v(TAG, "onReceive: intent action=" + intent.getAction() +
                    "  mOtaspMode=" + mOtaspMode);
        }

        PhoneGlobals globals = PhoneGlobals.getInstanceIfPrimary();
        if (globals == null) {
            if (DBG) Log.d(TAG, "Not primary user, nothing to do.");
            return;
        }

        if (!TelephonyCapabilities.supportsOtasp(PhoneGlobals.getPhone())) {
            if (DBG) Log.d(TAG, "OTASP not supported, nothing to do.");
            return;
        }

        if (mPhoneStateListenerRegistered == false) {
            if (DBG) Log.d(TAG, "Register our PhoneStateListener");
            TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(
                    Context.TELEPHONY_SERVICE);
            telephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_OTASP_CHANGED);
            mPhoneStateListenerRegistered = true;
        } else {
            if (DBG) Log.d(TAG, "PhoneStateListener already registered");
        }

        if (shouldPostpone(context)) {
            if (DBG) Log.d(TAG, "Postponing OTASP until wizard runs");
            return;
        }

        // Delay OTA provisioning if network is not available yet
        PhoneGlobals app = PhoneGlobals.getInstance();
        Phone phone = PhoneGlobals.getPhone();
        if (app.mCM.getServiceState() != ServiceState.STATE_IN_SERVICE) {
            if (DBG) Log.w(TAG, "Network is not ready. Registering to receive notification.");
            phone.registerForServiceStateChanged(mHandler, SERVICE_STATE_CHANGED, null);
            return;
        }

        // The following depends on the phone process being persistent. Normally we can't
        // expect a BroadcastReceiver to persist after returning from this function but it does
        // because the phone activity is persistent.
        if (DBG) Log.d(TAG, "call OtaUtils.maybeDoOtaCall");
        OtaUtils.maybeDoOtaCall(mContext, mHandler, MIN_READY);
    }

    /**
     * On devices that provide a phone initialization wizard (such as Google Setup Wizard), we
     * allow delaying CDMA OTA setup so it can be done in a single wizard. The wizard is responsible
     * for (1) disabling itself once it has been run and/or (2) setting the 'device_provisioned'
     * flag to something non-zero and (3) calling the OTA Setup with the action below.
     *
     * NB: Typical phone initialization wizards will install themselves as the homescreen
     * (category "android.intent.category.HOME") with a priority higher than the default.
     * The wizard should set 'device_provisioned' when it completes, disable itself with the
     * PackageManager.setComponentEnabledSetting() and then start home screen.
     *
     * @return true if setup will be handled by wizard, false if it should be done now.
     */
    private boolean shouldPostpone(Context context) {
        Intent intent = new Intent("android.intent.action.DEVICE_INITIALIZATION_WIZARD");
        ResolveInfo resolveInfo = context.getPackageManager().resolveActivity(intent,
                PackageManager.MATCH_DEFAULT_ONLY);
        boolean provisioned = Settings.Global.getInt(context.getContentResolver(),
                Settings.Global.DEVICE_PROVISIONED, 0) != 0;
        String mode = SystemProperties.get("ro.setupwizard.mode", "REQUIRED");
        boolean runningSetupWizard = "REQUIRED".equals(mode) || "OPTIONAL".equals(mode);
        if (DBG) {
            Log.v(TAG, "resolvInfo = " + resolveInfo + ", provisioned = " + provisioned
                    + ", runningSetupWizard = " + runningSetupWizard);
        }
        return resolveInfo != null && !provisioned && runningSetupWizard;
    }
}