/*
 * Copyright (C) 2013 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.tests.applaunch;

import java.io.OutputStreamWriter;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.ActivityManagerNative;
import android.app.ActivityManager;
import android.app.ActivityManager.ProcessErrorStateInfo;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.os.RemoteException;
import android.os.UserHandle;
import android.app.UiAutomation;
import android.app.IActivityManager;
import android.app.IActivityManager.WaitResult;
import android.support.test.rule.logging.AtraceLogger;
import android.test.InstrumentationTestCase;
import android.test.InstrumentationTestRunner;
import android.util.Log;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.Set;
import android.os.ParcelFileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;

/**
 * This test is intended to measure the time it takes for the apps to start.
 * Names of the applications are passed in command line, and the
 * test starts each application, and reports the start up time in milliseconds.
 * The instrumentation expects the following key to be passed on the command line:
 * apps - A list of applications to start and their corresponding result keys
 * in the following format:
 * -e apps <app name>^<result key>|<app name>^<result key>
 */
public class AppLaunch extends InstrumentationTestCase {

    private static final int JOIN_TIMEOUT = 10000;
    private static final String TAG = AppLaunch.class.getSimpleName();
    // optional parameter: comma separated list of required account types before proceeding
    // with the app launch
    private static final String KEY_REQUIRED_ACCOUNTS = "required_accounts";
    private static final String KEY_APPS = "apps";
    private static final String KEY_TRIAL_LAUNCH = "trial_launch";
    private static final String KEY_LAUNCH_ITERATIONS = "launch_iterations";
    private static final String KEY_LAUNCH_ORDER = "launch_order";
    private static final String KEY_DROP_CACHE = "drop_cache";
    private static final String KEY_SIMPLEPPERF_CMD = "simpleperf_cmd";
    private static final String KEY_TRACE_ITERATIONS = "trace_iterations";
    private static final String KEY_LAUNCH_DIRECTORY = "launch_directory";
    private static final String KEY_TRACE_DIRECTORY = "trace_directory";
    private static final String KEY_TRACE_CATEGORY = "trace_categories";
    private static final String KEY_TRACE_BUFFERSIZE = "trace_bufferSize";
    private static final String KEY_TRACE_DUMPINTERVAL = "tracedump_interval";
    private static final String WEARABLE_ACTION_GOOGLE =
            "com.google.android.wearable.action.GOOGLE";
    private static final int INITIAL_LAUNCH_IDLE_TIMEOUT = 60000; //60s to allow app to idle
    private static final int POST_LAUNCH_IDLE_TIMEOUT = 750; //750ms idle for non initial launches
    private static final int BETWEEN_LAUNCH_SLEEP_TIMEOUT = 5000; //5s between launching apps
    private static final String LAUNCH_SUB_DIRECTORY = "launch_logs";
    private static final String LAUNCH_FILE = "applaunch.txt";
    private static final String TRACE_SUB_DIRECTORY = "atrace_logs";
    private static final String DEFAULT_TRACE_CATEGORIES = "sched,freq,gfx,view,dalvik,webview,"
            + "input,wm,disk,am,wm";
    private static final String DEFAULT_TRACE_BUFFER_SIZE = "20000";
    private static final String DEFAULT_TRACE_DUMP_INTERVAL = "10";
    private static final String TRIAL_LAUNCH = "TRAIL_LAUNCH";
    private static final String DELIMITER = ",";
    private static final String DROP_CACHE_SCRIPT = "/data/local/tmp/dropCache.sh";
    private static final String APP_LAUNCH_CMD = "am start -W -n";
    private static final String SUCCESS_MESSAGE = "Status: ok";
    private static final String THIS_TIME = "ThisTime:";
    private static final String LAUNCH_ITERATION = "LAUNCH_ITERATION - %d";
    private static final String TRACE_ITERATION = "TRACE_ITERATION - %d";
    private static final String LAUNCH_ITERATION_PREFIX = "LAUNCH_ITERATION";
    private static final String TRACE_ITERATION_PREFIX = "TRACE_ITERATION";
    private static final String LAUNCH_ORDER_CYCLIC = "cyclic";
    private static final String LAUNCH_ORDER_SEQUENTIAL = "sequential";


    private Map<String, Intent> mNameToIntent;
    private Map<String, String> mNameToProcess;
    private List<LaunchOrder> mLaunchOrderList = new ArrayList<LaunchOrder>();
    private Map<String, String> mNameToResultKey;
    private Map<String, List<Long>> mNameToLaunchTime;
    private IActivityManager mAm;
    private String mSimplePerfCmd = null;
    private String mLaunchOrder = null;
    private boolean mDropCache = false;
    private int mLaunchIterations = 10;
    private int mTraceLaunchCount = 0;
    private String mTraceDirectoryStr = null;
    private Bundle mResult = new Bundle();
    private Set<String> mRequiredAccounts;
    private boolean mTrailLaunch = true;
    private File mFile = null;
    private FileOutputStream mOutputStream = null;
    private BufferedWriter mBufferedWriter = null;


    @Override
    protected void setUp() throws Exception {
        super.setUp();
        getInstrumentation().getUiAutomation().setRotation(UiAutomation.ROTATION_FREEZE_0);
    }

    @Override
    protected void tearDown() throws Exception {
        getInstrumentation().getUiAutomation().setRotation(UiAutomation.ROTATION_UNFREEZE);
        super.tearDown();
    }

    public void testMeasureStartUpTime() throws RemoteException, NameNotFoundException,
            IOException, InterruptedException {
        InstrumentationTestRunner instrumentation =
                (InstrumentationTestRunner)getInstrumentation();
        Bundle args = instrumentation.getArguments();
        mAm = ActivityManagerNative.getDefault();
        String launchDirectory = args.getString(KEY_LAUNCH_DIRECTORY);
        mTraceDirectoryStr = args.getString(KEY_TRACE_DIRECTORY);
        mDropCache = Boolean.parseBoolean(args.getString(KEY_DROP_CACHE));
        mSimplePerfCmd = args.getString(KEY_SIMPLEPPERF_CMD);
        mLaunchOrder = args.getString(KEY_LAUNCH_ORDER, LAUNCH_ORDER_CYCLIC);
        createMappings();
        parseArgs(args);
        checkAccountSignIn();

        // Root directory for applaunch file to log the app launch output
        // Will be useful in case of simpleperf command is used
        File launchRootDir = null;
        if (null != launchDirectory && !launchDirectory.isEmpty()) {
            launchRootDir = new File(launchDirectory);
            if (!launchRootDir.exists() && !launchRootDir.mkdirs()) {
                throw new IOException("Unable to create the destination directory");
            }
        }

        try {
            File launchSubDir = new File(launchRootDir, LAUNCH_SUB_DIRECTORY);
            if (!launchSubDir.exists() && !launchSubDir.mkdirs()) {
                throw new IOException("Unable to create the lauch file sub directory");
            }
            mFile = new File(launchSubDir, LAUNCH_FILE);
            mOutputStream = new FileOutputStream(mFile);
            mBufferedWriter = new BufferedWriter(new OutputStreamWriter(
                    mOutputStream));

            // Root directory for trace file during the launches
            File rootTrace = null;
            File rootTraceSubDir = null;
            int traceBufferSize = 0;
            int traceDumpInterval = 0;
            Set<String> traceCategoriesSet = null;
            if (null != mTraceDirectoryStr && !mTraceDirectoryStr.isEmpty()) {
                rootTrace = new File(mTraceDirectoryStr);
                if (!rootTrace.exists() && !rootTrace.mkdirs()) {
                    throw new IOException("Unable to create the trace directory");
                }
                rootTraceSubDir = new File(rootTrace, TRACE_SUB_DIRECTORY);
                if (!rootTraceSubDir.exists() && !rootTraceSubDir.mkdirs()) {
                    throw new IOException("Unable to create the trace sub directory");
                }
                assertNotNull("Trace iteration parameter is mandatory",
                        args.getString(KEY_TRACE_ITERATIONS));
                mTraceLaunchCount = Integer.parseInt(args.getString(KEY_TRACE_ITERATIONS));
                String traceCategoriesStr = args
                        .getString(KEY_TRACE_CATEGORY, DEFAULT_TRACE_CATEGORIES);
                traceBufferSize = Integer.parseInt(args.getString(KEY_TRACE_BUFFERSIZE,
                        DEFAULT_TRACE_BUFFER_SIZE));
                traceDumpInterval = Integer.parseInt(args.getString(KEY_TRACE_DUMPINTERVAL,
                        DEFAULT_TRACE_DUMP_INTERVAL));
                traceCategoriesSet = new HashSet<String>();
                if (!traceCategoriesStr.isEmpty()) {
                    String[] traceCategoriesSplit = traceCategoriesStr.split(DELIMITER);
                    for (int i = 0; i < traceCategoriesSplit.length; i++) {
                        traceCategoriesSet.add(traceCategoriesSplit[i]);
                    }
                }
            }

            // Get the app launch order based on launch order, trial launch,
            // launch iterations and trace iterations
            setLaunchOrder();

            for (LaunchOrder launch : mLaunchOrderList) {

                // App launch times for trial launch will not be used for final
                // launch time calculations.
                if (launch.getLaunchReason().equals(TRIAL_LAUNCH)) {
                    // In the "applaunch.txt" file, trail launches is referenced using
                    // "TRIAL_LAUNCH"
                    long launchTime = startApp(launch.getApp(), true, launch.getLaunchReason());
                    if (launchTime < 0) {
                        List<Long> appLaunchList = new ArrayList<Long>();
                        appLaunchList.add(-1L);
                        mNameToLaunchTime.put(launch.getApp(), appLaunchList);
                        // simply pass the app if launch isn't successful
                        // error should have already been logged by startApp
                        continue;
                    }
                    sleep(INITIAL_LAUNCH_IDLE_TIMEOUT);
                    closeApp(launch.getApp(), true);
                    dropCache();
                    sleep(BETWEEN_LAUNCH_SLEEP_TIMEOUT);
                }

                // App launch times used for final calculation
                if (launch.getLaunchReason().contains(LAUNCH_ITERATION_PREFIX)) {
                    long launchTime = -1;
                    if (null != mNameToLaunchTime.get(launch.getApp())) {
                        long firstLaunchTime = mNameToLaunchTime.get(launch.getApp()).get(0);
                        if (firstLaunchTime < 0) {
                            // skip if the app has failures while launched first
                            continue;
                        }
                    }
                    // In the "applaunch.txt" file app launches are referenced using
                    // "LAUNCH_ITERATION - ITERATION NUM"
                    launchTime = startApp(launch.getApp(), true, launch.getLaunchReason());
                    if (launchTime < 0) {
                        // if it fails once, skip the rest of the launches
                        List<Long> appLaunchList = new ArrayList<Long>();
                        appLaunchList.add(-1L);
                        mNameToLaunchTime.put(launch.getApp(), appLaunchList);
                        continue;
                    } else {
                        if (null != mNameToLaunchTime.get(launch.getApp())) {
                            mNameToLaunchTime.get(launch.getApp()).add(launchTime);
                        } else {
                            List<Long> appLaunchList = new ArrayList<Long>();
                            appLaunchList.add(launchTime);
                            mNameToLaunchTime.put(launch.getApp(), appLaunchList);
                        }
                    }
                    sleep(POST_LAUNCH_IDLE_TIMEOUT);
                    closeApp(launch.getApp(), true);
                    dropCache();
                    sleep(BETWEEN_LAUNCH_SLEEP_TIMEOUT);
                }

                // App launch times for trace launch will not be used for final
                // launch time calculations.
                if (launch.getLaunchReason().contains(TRACE_ITERATION_PREFIX)) {
                    AtraceLogger atraceLogger = AtraceLogger
                            .getAtraceLoggerInstance(getInstrumentation());
                    // Start the trace
                    try {
                        atraceLogger.atraceStart(traceCategoriesSet, traceBufferSize,
                                traceDumpInterval, rootTraceSubDir,
                                String.format("%s-%s", launch.getApp(), launch.getLaunchReason()));
                        startApp(launch.getApp(), true, launch.getLaunchReason());
                        sleep(POST_LAUNCH_IDLE_TIMEOUT);
                    } finally {
                        // Stop the trace
                        atraceLogger.atraceStop();
                        closeApp(launch.getApp(), true);
                        dropCache();
                        sleep(BETWEEN_LAUNCH_SLEEP_TIMEOUT);
                    }
                }
            }
        } finally {
            if (null != mBufferedWriter) {
                mBufferedWriter.close();
            }
        }

        for (String app : mNameToResultKey.keySet()) {
            StringBuilder launchTimes = new StringBuilder();
            for (Long launch : mNameToLaunchTime.get(app)) {
                launchTimes.append(launch);
                launchTimes.append(",");
            }
            mResult.putString(mNameToResultKey.get(app), launchTimes.toString());
        }
        instrumentation.sendStatus(0, mResult);
    }

    /**
     * If launch order is "cyclic" then apps will be launched one after the
     * other for each iteration count.
     * If launch order is "sequential" then each app will be launched for given number
     * iterations at once before launching the other apps.
     */
    private void setLaunchOrder() {
        if (LAUNCH_ORDER_CYCLIC.equalsIgnoreCase(mLaunchOrder)) {
            if (mTrailLaunch) {
                for (String app : mNameToResultKey.keySet()) {
                    mLaunchOrderList.add(new LaunchOrder(app, TRIAL_LAUNCH));
                }
            }
            for (int launchCount = 0; launchCount < mLaunchIterations; launchCount++) {
                for (String app : mNameToResultKey.keySet()) {
                    mLaunchOrderList.add(new LaunchOrder(app,
                            String.format(LAUNCH_ITERATION, launchCount)));
                }
            }
            if (mTraceDirectoryStr != null && !mTraceDirectoryStr.isEmpty()) {
                for (int traceCount = 0; traceCount < mTraceLaunchCount; traceCount++) {
                    for (String app : mNameToResultKey.keySet()) {
                        mLaunchOrderList.add(new LaunchOrder(app,
                                String.format(TRACE_ITERATION, traceCount)));
                    }
                }
            }
        } else if (LAUNCH_ORDER_SEQUENTIAL.equalsIgnoreCase(mLaunchOrder)) {
            for (String app : mNameToResultKey.keySet()) {
                if (mTrailLaunch) {
                    mLaunchOrderList.add(new LaunchOrder(app, TRIAL_LAUNCH));
                }
                for (int launchCount = 0; launchCount < mLaunchIterations; launchCount++) {
                    mLaunchOrderList.add(new LaunchOrder(app,
                            String.format(LAUNCH_ITERATION, launchCount)));
                }
                if (mTraceDirectoryStr != null && !mTraceDirectoryStr.isEmpty()) {
                    for (int traceCount = 0; traceCount < mTraceLaunchCount; traceCount++) {
                        mLaunchOrderList.add(new LaunchOrder(app,
                                String.format(TRACE_ITERATION, traceCount)));
                    }
                }
            }
        } else {
            assertTrue("Launch order is not valid parameter", false);
        }
    }

    private void dropCache() {
        if (true == mDropCache) {
            assertNotNull("Issue in dropping the cache",
                    getInstrumentation().getUiAutomation()
                            .executeShellCommand(DROP_CACHE_SCRIPT));
        }
    }

    private void parseArgs(Bundle args) {
        mNameToResultKey = new LinkedHashMap<String, String>();
        mNameToLaunchTime = new HashMap<String, List<Long>>();
        String launchIterations = args.getString(KEY_LAUNCH_ITERATIONS);
        if (launchIterations != null) {
            mLaunchIterations = Integer.parseInt(launchIterations);
        }
        String appList = args.getString(KEY_APPS);
        if (appList == null)
            return;

        String appNames[] = appList.split("\\|");
        for (String pair : appNames) {
            String[] parts = pair.split("\\^");
            if (parts.length != 2) {
                Log.e(TAG, "The apps key is incorrectly formatted");
                fail();
            }

            mNameToResultKey.put(parts[0], parts[1]);
            mNameToLaunchTime.put(parts[0], null);
        }
        String requiredAccounts = args.getString(KEY_REQUIRED_ACCOUNTS);
        if (requiredAccounts != null) {
            mRequiredAccounts = new HashSet<String>();
            for (String accountType : requiredAccounts.split(",")) {
                mRequiredAccounts.add(accountType);
            }
        }
        mTrailLaunch = "true".equals(args.getString(KEY_TRIAL_LAUNCH));
    }

    private boolean hasLeanback(Context context) {
        return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_LEANBACK);
    }

    private void createMappings() {
        mNameToIntent = new LinkedHashMap<String, Intent>();
        mNameToProcess = new LinkedHashMap<String, String>();

        PackageManager pm = getInstrumentation().getContext()
                .getPackageManager();
        Intent intentToResolve = new Intent(Intent.ACTION_MAIN);
        intentToResolve.addCategory(hasLeanback(getInstrumentation().getContext()) ?
                Intent.CATEGORY_LEANBACK_LAUNCHER :
                Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> ris = pm.queryIntentActivities(intentToResolve, 0);
        resolveLoop(ris, intentToResolve, pm);
        // For Wear
        intentToResolve = new Intent(WEARABLE_ACTION_GOOGLE);
        ris = pm.queryIntentActivities(intentToResolve, 0);
        resolveLoop(ris, intentToResolve, pm);
    }

    private void resolveLoop(List<ResolveInfo> ris, Intent intentToResolve, PackageManager pm) {
        if (ris == null || ris.isEmpty()) {
            Log.i(TAG, "Could not find any apps");
        } else {
            for (ResolveInfo ri : ris) {
                Intent startIntent = new Intent(intentToResolve);
                startIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                        | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                startIntent.setClassName(ri.activityInfo.packageName,
                        ri.activityInfo.name);
                String appName = ri.loadLabel(pm).toString();
                if (appName != null) {
                    mNameToIntent.put(appName, startIntent);
                    mNameToProcess.put(appName, ri.activityInfo.processName);
                }
            }
        }
    }

    private long startApp(String appName, boolean forceStopBeforeLaunch, String launchReason)
            throws NameNotFoundException, RemoteException {
        Log.i(TAG, "Starting " + appName);

        Intent startIntent = mNameToIntent.get(appName);
        if (startIntent == null) {
            Log.w(TAG, "App does not exist: " + appName);
            mResult.putString(mNameToResultKey.get(appName), "App does not exist");
            return -1L;
        }
        AppLaunchRunnable runnable = new AppLaunchRunnable(startIntent, forceStopBeforeLaunch ,
                launchReason);
        Thread t = new Thread(runnable);
        t.start();
        try {
            t.join(JOIN_TIMEOUT);
        } catch (InterruptedException e) {
            // ignore
        }
        return runnable.getResult();
    }

    private void checkAccountSignIn() {
        // ensure that the device has the required account types before starting test
        // e.g. device must have a valid Google account sign in to measure a meaningful launch time
        // for Gmail
        if (mRequiredAccounts == null || mRequiredAccounts.isEmpty()) {
            return;
        }
        final AccountManager am =
                (AccountManager) getInstrumentation().getTargetContext().getSystemService(
                        Context.ACCOUNT_SERVICE);
        Account[] accounts = am.getAccounts();
        // use set here in case device has multiple accounts of the same type
        Set<String> foundAccounts = new HashSet<String>();
        for (Account account : accounts) {
            if (mRequiredAccounts.contains(account.type)) {
                foundAccounts.add(account.type);
            }
        }
        // check if account type matches, if not, fail test with message on what account types
        // are missing
        if (mRequiredAccounts.size() != foundAccounts.size()) {
            mRequiredAccounts.removeAll(foundAccounts);
            StringBuilder sb = new StringBuilder("Device missing these accounts:");
            for (String account : mRequiredAccounts) {
                sb.append(' ');
                sb.append(account);
            }
            fail(sb.toString());
        }
    }

    private void closeApp(String appName, boolean forceStopApp) {
        Intent homeIntent = new Intent(Intent.ACTION_MAIN);
        homeIntent.addCategory(Intent.CATEGORY_HOME);
        homeIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        getInstrumentation().getContext().startActivity(homeIntent);
        sleep(POST_LAUNCH_IDLE_TIMEOUT);
        if (forceStopApp) {
            Intent startIntent = mNameToIntent.get(appName);
            if (startIntent != null) {
                String packageName = startIntent.getComponent().getPackageName();
                try {
                    mAm.forceStopPackage(packageName, UserHandle.USER_CURRENT);
                } catch (RemoteException e) {
                    Log.w(TAG, "Error closing app", e);
                }
            }
        }
    }

    private void sleep(int time) {
        try {
            Thread.sleep(time);
        } catch (InterruptedException e) {
            // ignore
        }
    }

    private void reportError(String appName, String processName) {
        ActivityManager am = (ActivityManager) getInstrumentation()
                .getContext().getSystemService(Context.ACTIVITY_SERVICE);
        List<ProcessErrorStateInfo> crashes = am.getProcessesInErrorState();
        if (crashes != null) {
            for (ProcessErrorStateInfo crash : crashes) {
                if (!crash.processName.equals(processName))
                    continue;

                Log.w(TAG, appName + " crashed: " + crash.shortMsg);
                mResult.putString(mNameToResultKey.get(appName), crash.shortMsg);
                return;
            }
        }

        mResult.putString(mNameToResultKey.get(appName),
                "Crashed for unknown reason");
        Log.w(TAG, appName
                + " not found in process list, most likely it is crashed");
    }

    private class LaunchOrder {
        private String mApp;
        private String mLaunchReason;

        LaunchOrder(String app,String launchReason){
            mApp = app;
            mLaunchReason = launchReason;
        }

        public String getApp() {
            return mApp;
        }

        public void setApp(String app) {
            mApp = app;
        }

        public String getLaunchReason() {
            return mLaunchReason;
        }

        public void setLaunchReason(String launchReason) {
            mLaunchReason = launchReason;
        }
    }

    private class AppLaunchRunnable implements Runnable {
        private Intent mLaunchIntent;
        private Long mResult;
        private boolean mForceStopBeforeLaunch;
        private String mLaunchReason;

        public AppLaunchRunnable(Intent intent, boolean forceStopBeforeLaunch,
                String launchReason) {
            mLaunchIntent = intent;
            mForceStopBeforeLaunch = forceStopBeforeLaunch;
            mLaunchReason = launchReason;
            mResult = -1L;
        }

        public Long getResult() {
            return mResult;
        }

        public void run() {
            try {
                String packageName = mLaunchIntent.getComponent().getPackageName();
                String componentName = mLaunchIntent.getComponent().flattenToShortString();
                if (mForceStopBeforeLaunch) {
                    mAm.forceStopPackage(packageName, UserHandle.USER_CURRENT);
                }
                String launchCmd = String.format("%s %s", APP_LAUNCH_CMD, componentName);
                if (null != mSimplePerfCmd) {
                    launchCmd = String.format("%s %s", mSimplePerfCmd, launchCmd);
                }
                Log.v(TAG, "Final launch cmd:" + launchCmd);
                ParcelFileDescriptor parcelDesc = getInstrumentation().getUiAutomation()
                        .executeShellCommand(launchCmd);
                mResult = Long.parseLong(parseLaunchTimeAndWrite(parcelDesc, String.format
                        ("App Launch :%s %s",
                                componentName, mLaunchReason)), 10);
            } catch (RemoteException e) {
                Log.w(TAG, "Error launching app", e);
            }
        }

        /**
         * Method to parse the launch time info and write the result to file
         *
         * @param parcelDesc
         * @return
         */
        private String parseLaunchTimeAndWrite(ParcelFileDescriptor parcelDesc, String headerInfo) {
            String launchTime = "-1";
            boolean launchSuccess = false;
            try {
                InputStream inputStream = new FileInputStream(parcelDesc.getFileDescriptor());
                StringBuilder appLaunchOuput = new StringBuilder();
                /* SAMPLE OUTPUT :
                Starting: Intent { cmp=com.google.android.calculator/com.android.calculator2.Calculator }
                Status: ok
                Activity: com.google.android.calculator/com.android.calculator2.Calculator
                ThisTime: 357
                TotalTime: 357
                WaitTime: 377
                Complete*/
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(
                        inputStream));
                String line = null;
                int lineCount = 1;
                mBufferedWriter.newLine();
                mBufferedWriter.write(headerInfo);
                mBufferedWriter.newLine();
                while ((line = bufferedReader.readLine()) != null) {
                    if (lineCount == 2 && line.contains(SUCCESS_MESSAGE)) {
                        launchSuccess = true;
                    }
                    if (launchSuccess && lineCount == 4) {
                        String launchSplit[] = line.split(":");
                        launchTime = launchSplit[1].trim();
                    }
                    mBufferedWriter.write(line);
                    mBufferedWriter.newLine();
                    lineCount++;
                }
                mBufferedWriter.flush();
                inputStream.close();
            } catch (IOException e) {
                Log.w(TAG, "Error writing the launch file", e);
            }
            return launchTime;
        }

    }
}