#!/usr/bin/env python3
#
# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import os
import subprocess
import sys

BUILDROOT_DIR = os.path.abspath(os.path.join(os.path.realpath(__file__), '..', '..', '..'))

PERFETTO_SESSION_KEY = 'session1'
PERFETTO_TRACE_FILE = '/data/misc/perfetto-traces/trace'
PERFETTO_CONFIG = '''
write_into_file: true
file_write_period_ms: 1000000000
flush_period_ms: 1000

buffers: {
    size_kb: 129024
}
data_sources: {
    config {
        name: "linux.ftrace"
        ftrace_config {
            ftrace_events: "ftrace/print"
            atrace_apps: "%s"
        }
    }
}
'''

def InstallApk(apk_path, package_name, adb_path='adb'):
  print('Installing APK')
  subprocess.check_output([adb_path, 'shell', 'am', 'force-stop', package_name])
  # Allowed to fail if APK was never installed.
  subprocess.call([adb_path, 'uninstall', package_name], stdout=subprocess.DEVNULL)
  subprocess.check_output([adb_path, 'install', apk_path])


def StartPerfetto(package_name, adb_path='adb'):
  print('Starting trace')
  cmd = [adb_path, 'shell', 'echo' , "'" + PERFETTO_CONFIG % package_name + "'", '|',
      'perfetto', '-c', '-', '--txt', '-o', PERFETTO_TRACE_FILE,
      '--detach', PERFETTO_SESSION_KEY]

  subprocess.check_output(cmd, stderr=subprocess.STDOUT)


def LaunchPackage(package_name, activity_name, adb_path='adb'):
  print('Scanning logcat')
  subprocess.check_output([adb_path, 'logcat', '-c'], stderr=subprocess.STDOUT)
  logcat = subprocess.Popen([adb_path, 'logcat'], stdout=subprocess.PIPE,
      stderr=subprocess.STDOUT, universal_newlines=True)

  print('Launching %s (%s)' % (package_name, activity_name))
  subprocess.check_output(
      [adb_path, 'shell', 'am ', 'start', '-n',
          '%s/%s' % (package_name, activity_name)], stderr=subprocess.STDOUT)
  for line in logcat.stdout:
    print('>>>>>>>> ' + line.strip())
    if 'Observatory listening' in line:
      logcat.kill()
      break


def CollectAndValidateTrace(adb_path = 'adb'):
  print('Fetching trace')
  subprocess.check_output([adb_path, 'shell', 'perfetto', '--attach',
      PERFETTO_SESSION_KEY, '--stop'], stderr=subprocess.STDOUT)
  subprocess.check_output([adb_path, 'pull', PERFETTO_TRACE_FILE, 'trace.pb'], stderr=subprocess.STDOUT)

  print('Validating trace')
  traceconv = os.path.join(BUILDROOT_DIR, 'third_party',
      'android_tools', 'trace_to_text', 'trace_to_text')
  traceconv_output = subprocess.check_output([traceconv, 'systrace', 'trace.pb'], stderr=subprocess.STDOUT, universal_newlines=True)

  print('Trace output:')
  print(traceconv_output)

  if 'ShellSetupUISubsystem' in traceconv_output:
    return 0

  print('Trace did not contain ShellSetupUISubsystem, failing.')
  return 1


def main():
  parser = argparse.ArgumentParser()

  parser.add_argument('--apk-path', dest='apk_path', action='store',
      help='Provide the path to the APK to install')
  parser.add_argument('--package-name', dest='package_name', action='store',
      help='The package name of the APK, e.g. dev.flutter.scenarios')
  parser.add_argument('--activity-name', dest='activity_name', action='store',
      help='The activity to launch as it appears in AndroidManifest.xml, '
           'e.g. .TextPlatformViewActivity')
  parser.add_argument('--adb-path', dest='adb_path', action='store',
      default='adb', help='Provide the path of adb used for android tests. '
          'By default it looks on $PATH.')

  args = parser.parse_args()

  InstallApk(args.apk_path, args.package_name, args.adb_path)
  StartPerfetto(args.package_name, args.adb_path)
  LaunchPackage(args.package_name, args.activity_name, args.adb_path)
  return CollectAndValidateTrace(args.adb_path)


if __name__ == '__main__':
  sys.exit(main())