#!/usr/bin/env python3
# Copyright (c) 2022, the R8 project authors. Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

from enum import Enum
import subprocess
import time

DEVNULL=subprocess.DEVNULL

class ScreenState(Enum):
  OFF_LOCKED = 1,
  OFF_UNLOCKED = 2
  ON_LOCKED = 3
  ON_UNLOCKED = 4

  def is_off(self):
    return self == ScreenState.OFF_LOCKED or self == ScreenState.OFF_UNLOCKED

  def is_on(self):
    return self == ScreenState.ON_LOCKED or self == ScreenState.ON_UNLOCKED

  def is_on_and_locked(self):
    return self == ScreenState.ON_LOCKED

  def is_on_and_unlocked(self):
    return self == ScreenState.ON_UNLOCKED

def create_adb_cmd(arguments, device_id=None):
  assert isinstance(arguments, list) or isinstance(arguments, str)
  cmd = ['adb']
  if device_id is not None:
    cmd.append('-s')
    cmd.append(device_id)
  cmd.extend(arguments if isinstance(arguments, list) else arguments.split(' '))
  return cmd

def capture_app_profile_data(app_id, device_id=None):
  cmd = create_adb_cmd(
      'shell killall -s SIGUSR1 %s' % app_id, device_id)
  subprocess.check_output(cmd)
  time.sleep(5)

def check_app_has_profile_data(app_id, device_id=None):
  profile_path = get_profile_path(app_id)
  cmd = create_adb_cmd(
      'shell du /data/misc/profiles/cur/0/%s/primary.prof' % app_id,
      device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  size_str = stdout[:stdout.index('\t')]
  assert size_str.isdigit()
  size = int(size_str)
  if size == 4:
    raise ValueError('Expected size of profile at %s to be > 4K' % profile_path)

def clear_profile_data(app_id, device_id=None):
  cmd = create_adb_cmd(
      'shell cmd package compile --reset %s' % app_id, device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def drop_caches(device_id=None):
  cmd = create_adb_cmd(
      ['shell', 'echo 3 > /proc/sys/vm/drop_caches'], device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def force_compilation(app_id, device_id=None):
  cmd = create_adb_cmd(
      'shell cmd package compile -m speed -f %s' % app_id, device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def force_profile_compilation(app_id, device_id=None):
  cmd = create_adb_cmd(
      'shell cmd package compile -m speed-profile -f %s' % app_id, device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def get_apk_path(app_id, device_id=None):
  cmd = create_adb_cmd('shell pm path %s' % app_id, device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  if not stdout.startswith('package:'):
    raise ValueError(
        'Expected stdout to start with "package:", was: %s' % stdout)
  apk_path = stdout[len('package:'):]
  if not apk_path.endswith('.apk'):
    raise ValueError(
        'Expected stdout to end with ".apk", was: %s' % stdout)
  return apk_path

def get_profile_path(app_id):
  return '/data/misc/profiles/cur/0/%s/primary.prof' % app_id

def get_minor_major_page_faults(app_id, device_id=None):
  pid = get_pid(app_id, device_id)
  cmd = create_adb_cmd('shell ps -p %i -o MINFL,MAJFL' % pid)
  stdout = subprocess.check_output(cmd).decode('utf-8')
  lines_it = iter(stdout.splitlines())
  first_line = next(lines_it)
  assert first_line == ' MINFL  MAJFL'
  second_line = next(lines_it)
  minfl, majfl = second_line.split()
  assert minfl.isdigit()
  assert majfl.isdigit()
  return (int(minfl), int(majfl))

def get_pid(app_id, device_id=None):
  cmd = create_adb_cmd('shell pidof %s' % app_id, device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  assert stdout.isdigit()
  pid = int(stdout)
  return pid

def get_screen_state(device_id=None):
  cmd = create_adb_cmd('shell dumpsys nfc', device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  screen_state_value = None
  for line in stdout.splitlines():
    if line.startswith('mScreenState='):
      value_start_index = len('mScreenState=')
      screen_state_value=line[value_start_index:]
  if screen_state_value is None:
    raise ValueError('Expected to find mScreenState in: adb shell dumpsys nfc')
  if not hasattr(ScreenState, screen_state_value):
    raise ValueError(
        'Expected mScreenState to be a value of ScreenState, was: %s'
            % screen_state_value)
  return ScreenState[screen_state_value]

def get_classes_and_methods_from_app_profile(app_id, device_id=None):
  apk_path = get_apk_path(app_id, device_id)
  profile_path = get_profile_path(app_id)

  # Generates a list of class and method descriptors, prefixed with one or more
  # flags 'H' (hot), 'S' (startup), 'P' (post startup).
  #
  # Example:
  #
  # HSPLandroidx/compose/runtime/ComposerImpl;->updateValue(Ljava/lang/Object;)V
  # HSPLandroidx/compose/runtime/ComposerImpl;->updatedNodeCount(I)I
  # HLandroidx/compose/runtime/ComposerImpl;->validateNodeExpected()V
  # PLandroidx/compose/runtime/CompositionImpl;->applyChanges()V
  # HLandroidx/compose/runtime/ComposerKt;->findLocation(Ljava/util/List;I)I
  # Landroidx/compose/runtime/ComposerImpl;
  #
  # See also https://developer.android.com/studio/profile/baselineprofiles.
  cmd = create_adb_cmd(
    'shell profman --dump-classes-and-methods'
    ' --profile-file=%s --apk=%s --dex-location=%s'
        % (profile_path, apk_path, apk_path))
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  lines = stdout.splitlines()
  classes_and_methods = []
  flags_to_name = { 'H': 'hot', 'S': 'startup', 'P': 'post_startup' }
  for line in lines:
    flags = { 'hot': False, 'startup': False, 'post_startup': False }
    while line[0] in flags_to_name:
      flag_abbreviation = line[0]
      flag_name = flags_to_name.get(flag_abbreviation)
      flags[flag_name] = True
      line = line[1:]
    assert line.startswith('L')
    classes_and_methods.append({ 'descriptor': line, 'flags': flags })
  return classes_and_methods

def get_screen_off_timeout(device_id=None):
  cmd = create_adb_cmd(
      'shell settings get system screen_off_timeout', device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  assert stdout.isdigit()
  screen_off_timeout = int(stdout)
  return screen_off_timeout

def install(apk, device_id=None):
  cmd = create_adb_cmd('install %s' % apk, device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8')
  assert 'Success' in stdout

def issue_key_event(key_event, device_id=None, sleep_in_seconds=1):
  cmd = create_adb_cmd('shell input keyevent %s' % key_event, device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  assert len(stdout) == 0
  time.sleep(sleep_in_seconds)

def launch_activity(
    app_id, activity, device_id=None, wait_for_activity_to_launch=False):
  args = ['shell', 'am', 'start', '-n', '%s/%s' % (app_id, activity)]
  if wait_for_activity_to_launch:
    args.append('-W')
  cmd = create_adb_cmd(args, device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  expected_stdout = (
      'Starting: Intent { cmp=%s/.%s }' % (app_id, activity[len(app_id)+1:]))
  assert stdout.startswith(expected_stdout), 'was %s' % stdout
  lines = stdout.splitlines()
  result = {}
  for line in lines:
    if line.startswith('TotalTime: '):
      total_time_str = line.removeprefix('TotalTime: ')
      assert total_time_str.isdigit()
      result['total_time'] = int(total_time_str)
  assert not wait_for_activity_to_launch or 'total_time' in result
  return result

def prepare_for_interaction_with_device(device_id=None, device_pin=None):
  # Increase screen off timeout to avoid device screen turns off.
  twenty_four_hours_in_millis = 24 * 60 * 60 * 1000
  previous_screen_off_timeout = get_screen_off_timeout(device_id)
  set_screen_off_timeout(twenty_four_hours_in_millis, device_id)

  # Unlock device.
  unlock(device_id, device_pin)

  tear_down_options = {
    'previous_screen_off_timeout': previous_screen_off_timeout
  }
  return tear_down_options

def root(device_id=None):
  cmd = create_adb_cmd('root', device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def set_screen_off_timeout(screen_off_timeout_in_millis, device_id=None):
  cmd = create_adb_cmd(
      'shell settings put system screen_off_timeout %i'
          % screen_off_timeout_in_millis,
      device_id)
  stdout = subprocess.check_output(cmd).decode('utf-8').strip()
  assert len(stdout) == 0

def stop_app(app_id, device_id=None):
  cmd = create_adb_cmd('shell am force-stop %s' % app_id, device_id)
  subprocess.check_call(cmd, stdout=DEVNULL, stderr=DEVNULL)

def tear_down_after_interaction_with_device(tear_down_options, device_id=None):
  # Reset screen off timeout.
  set_screen_off_timeout(
      tear_down_options['previous_screen_off_timeout'],
      device_id)

def uninstall(app_id, device_id=None):
  cmd = create_adb_cmd('uninstall %s' % app_id, device_id)
  process_result = subprocess.run(cmd, capture_output=True)
  stdout = process_result.stdout.decode('utf-8')
  stderr = process_result.stderr.decode('utf-8')
  if process_result.returncode == 0:
    assert 'Success' in stdout
  else:
    expected_error = (
        'java.lang.IllegalArgumentException: Unknown package: %s' % app_id)
    assert expected_error in stderr

def unlock(device_id=None, device_pin=None):
  screen_state = get_screen_state(device_id)
  if screen_state.is_off():
    issue_key_event('KEYCODE_POWER', device_id)
    screen_state = get_screen_state(device_id)
  assert screen_state.is_on(), 'was %s' % screen_state
  if screen_state.is_on_and_locked():
    if device_pin is not None:
      raise NotImplementedError('Device unlocking with pin not implemented')
    issue_key_event('KEYCODE_MENU', device_id)
    screen_state = get_screen_state(device_id)
  assert screen_state.is_on_and_unlocked(), 'was %s' % screen_state