# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Environment setup and teardown for remote devices."""

import distutils.version
import json
import logging
import os
import random
import sys

from devil.utils import reraiser_thread
from devil.utils import timeout_retry
from pylib.base import environment
from pylib.remote.device import appurify_sanitized
from pylib.remote.device import remote_device_helper

class RemoteDeviceEnvironment(environment.Environment):
  """An environment for running on remote devices."""

  _ENV_KEY = 'env'
  _DEVICE_KEY = 'device'
  _DEFAULT_RETRIES = 0

  def __init__(self, args, error_func):
    """Constructor.

    Args:
      args: Command line arguments.
      error_func: error to show when using bad command line arguments.
    """
    super(RemoteDeviceEnvironment, self).__init__()
    self._access_token = None
    self._device = None
    self._device_type = args.device_type
    self._verbose_count = args.verbose_count
    self._timeouts = {
        'queueing': 60 * 10,
        'installing': 60 * 10,
        'in-progress': 60 * 30,
        'unknown': 60 * 5
    }
    # Example config file:
    # {
    #   "remote_device": ["Galaxy S4", "Galaxy S3"],
    #   "remote_device_os": ["4.4.2", "4.4.4"],
    #   "remote_device_minimum_os": "4.4.2",
    #   "api_address": "www.example.com",
    #   "api_port": "80",
    #   "api_protocol": "http",
    #   "api_secret": "apisecret",
    #   "api_key": "apikey",
    #   "timeouts": {
    #     "queueing": 600,
    #     "installing": 600,
    #     "in-progress": 1800,
    #     "unknown": 300
    #   }
    # }
    if args.remote_device_file:
      with open(args.remote_device_file) as device_file:
        device_json = json.load(device_file)
    else:
      device_json = {}

    self._api_address = device_json.get('api_address', None)
    self._api_key = device_json.get('api_key', None)
    self._api_port = device_json.get('api_port', None)
    self._api_protocol = device_json.get('api_protocol', None)
    self._api_secret = device_json.get('api_secret', None)
    self._device_oem = device_json.get('device_oem', None)
    self._device_type = device_json.get('device_type', 'Android')
    self._network_config = device_json.get('network_config', None)
    self._remote_device = device_json.get('remote_device', None)
    self._remote_device_minimum_os = device_json.get(
        'remote_device_minimum_os', None)
    self._remote_device_os = device_json.get('remote_device_os', None)
    self._remote_device_timeout = device_json.get(
        'remote_device_timeout', None)
    self._results_path = device_json.get('results_path', None)
    self._runner_package = device_json.get('runner_package', None)
    self._runner_type = device_json.get('runner_type', None)
    self._timeouts.update(device_json.get('timeouts', {}))

    def command_line_override(
        file_value, cmd_line_value, desc, print_value=True):
      if cmd_line_value:
        if file_value and file_value != cmd_line_value:
          if print_value:
            logging.info('Overriding %s from %s to %s',
                         desc, file_value, cmd_line_value)
          else:
            logging.info('overriding %s', desc)
        return cmd_line_value
      return file_value

    self._api_address = command_line_override(
        self._api_address, args.api_address, 'api_address')
    self._api_port = command_line_override(
        self._api_port, args.api_port, 'api_port')
    self._api_protocol = command_line_override(
        self._api_protocol, args.api_protocol, 'api_protocol')
    self._device_oem = command_line_override(
        self._device_oem, args.device_oem, 'device_oem')
    self._device_type = command_line_override(
        self._device_type, args.device_type, 'device_type')
    self._network_config = command_line_override(
        self._network_config, args.network_config, 'network_config')
    self._remote_device = command_line_override(
        self._remote_device, args.remote_device, 'remote_device')
    self._remote_device_minimum_os = command_line_override(
        self._remote_device_minimum_os, args.remote_device_minimum_os,
        'remote_device_minimum_os')
    self._remote_device_os = command_line_override(
        self._remote_device_os, args.remote_device_os, 'remote_device_os')
    self._remote_device_timeout = command_line_override(
        self._remote_device_timeout, args.remote_device_timeout,
        'remote_device_timeout')
    self._results_path = command_line_override(
        self._results_path, args.results_path, 'results_path')
    self._runner_package = command_line_override(
        self._runner_package, args.runner_package, 'runner_package')
    self._runner_type = command_line_override(
        self._runner_type, args.runner_type, 'runner_type')
    self._timeouts["in-progress"] = command_line_override(
        self._timeouts["in-progress"], args.test_timeout, 'test_timeout')

    if args.api_key_file:
      with open(args.api_key_file) as api_key_file:
        temp_key = api_key_file.read().strip()
        self._api_key = command_line_override(
            self._api_key, temp_key, 'api_key', print_value=False)
    self._api_key = command_line_override(
        self._api_key, args.api_key, 'api_key', print_value=False)

    if args.api_secret_file:
      with open(args.api_secret_file) as api_secret_file:
        temp_secret = api_secret_file.read().strip()
        self._api_secret = command_line_override(
            self._api_secret, temp_secret, 'api_secret', print_value=False)
    self._api_secret = command_line_override(
        self._api_secret, args.api_secret, 'api_secret', print_value=False)

    if not self._api_address:
      error_func('Must set api address with --api-address'
                 ' or in --remote-device-file.')
    if not self._api_key:
      error_func('Must set api key with --api-key, --api-key-file'
                 ' or in --remote-device-file')
    if not self._api_port:
      error_func('Must set api port with --api-port'
                 ' or in --remote-device-file')
    if not self._api_protocol:
      error_func('Must set api protocol with --api-protocol'
                 ' or in --remote-device-file. Example: http')
    if not self._api_secret:
      error_func('Must set api secret with --api-secret, --api-secret-file'
                 ' or in --remote-device-file')

    logging.info('Api address: %s', self._api_address)
    logging.info('Api port: %s', self._api_port)
    logging.info('Api protocol: %s', self._api_protocol)
    logging.info('Remote device: %s', self._remote_device)
    logging.info('Remote device minimum OS: %s',
                 self._remote_device_minimum_os)
    logging.info('Remote device OS: %s', self._remote_device_os)
    logging.info('Remote device OEM: %s', self._device_oem)
    logging.info('Remote device type: %s', self._device_type)
    logging.info('Remote device timout: %s', self._remote_device_timeout)
    logging.info('Results Path: %s', self._results_path)
    logging.info('Runner package: %s', self._runner_package)
    logging.info('Runner type: %s', self._runner_type)
    logging.info('Timeouts: %s', self._timeouts)

    if not args.trigger and not args.collect:
      self._trigger = True
      self._collect = True
    else:
      self._trigger = args.trigger
      self._collect = args.collect

  def SetUp(self):
    """Set up the test environment."""
    os.environ['APPURIFY_API_PROTO'] = self._api_protocol
    os.environ['APPURIFY_API_HOST'] = self._api_address
    os.environ['APPURIFY_API_PORT'] = self._api_port
    os.environ['APPURIFY_STATUS_BASE_URL'] = 'none'
    self._GetAccessToken()
    if self._trigger:
      self._SelectDevice()

  def TearDown(self):
    """Teardown the test environment."""
    self._RevokeAccessToken()

  def __enter__(self):
    """Set up the test run when used as a context manager."""
    try:
      self.SetUp()
      return self
    except:
      self.__exit__(*sys.exc_info())
      raise

  def __exit__(self, exc_type, exc_val, exc_tb):
    """Tears down the test run when used as a context manager."""
    self.TearDown()

  def DumpTo(self, persisted_data):
    env_data = {
      self._DEVICE_KEY: self._device,
    }
    persisted_data[self._ENV_KEY] = env_data

  def LoadFrom(self, persisted_data):
    env_data = persisted_data[self._ENV_KEY]
    self._device = env_data[self._DEVICE_KEY]

  def _GetAccessToken(self):
    """Generates access token for remote device service."""
    logging.info('Generating remote service access token')
    with appurify_sanitized.SanitizeLogging(self._verbose_count,
                                            logging.WARNING):
      access_token_results = appurify_sanitized.api.access_token_generate(
          self._api_key, self._api_secret)
    remote_device_helper.TestHttpResponse(access_token_results,
                                          'Unable to generate access token.')
    self._access_token = access_token_results.json()['response']['access_token']

  def _RevokeAccessToken(self):
    """Destroys access token for remote device service."""
    logging.info('Revoking remote service access token')
    with appurify_sanitized.SanitizeLogging(self._verbose_count,
                                            logging.WARNING):
      revoke_token_results = appurify_sanitized.api.access_token_revoke(
          self._access_token)
    remote_device_helper.TestHttpResponse(revoke_token_results,
                                          'Unable to revoke access token.')

  def _SelectDevice(self):
    if self._remote_device_timeout:
      try:
        timeout_retry.Run(self._FindDeviceWithTimeout,
                          self._remote_device_timeout, self._DEFAULT_RETRIES)
      except reraiser_thread.TimeoutError:
        self._NoDeviceFound()
    else:
      if not self._FindDevice():
        self._NoDeviceFound()

  def _FindDevice(self):
    """Find which device to use."""
    logging.info('Finding device to run tests on.')
    device_list = self._GetDeviceList()
    random.shuffle(device_list)
    for device in device_list:
      if device['os_name'] != self._device_type:
        continue
      if self._remote_device and device['name'] not in self._remote_device:
        continue
      if (self._remote_device_os
          and device['os_version'] not in self._remote_device_os):
        continue
      if self._device_oem and device['brand'] not in self._device_oem:
        continue
      if (self._remote_device_minimum_os
          and distutils.version.LooseVersion(device['os_version'])
          < distutils.version.LooseVersion(self._remote_device_minimum_os)):
        continue
      if device['has_available_device']:
        logging.info('Found device: %s %s',
                     device['name'], device['os_version'])
        self._device = device
        return True
    return False

  def _FindDeviceWithTimeout(self):
    """Find which device to use with timeout."""
    timeout_retry.WaitFor(self._FindDevice, wait_period=1)

  def _PrintAvailableDevices(self, device_list):
    def compare_devices(a, b):
      for key in ('os_version', 'name'):
        c = cmp(a[key], b[key])
        if c:
          return c
      return 0

    logging.critical('Available %s Devices:', self._device_type)
    logging.critical(
        '  %s %s %s %s %s',
        'OS'.ljust(10),
        'Device Name'.ljust(30),
        'Available'.ljust(10),
        'Busy'.ljust(10),
        'All'.ljust(10))
    devices = (d for d in device_list if d['os_name'] == self._device_type)
    for d in sorted(devices, compare_devices):
      logging.critical(
          '  %s %s %s %s %s',
          d['os_version'].ljust(10),
          d['name'].ljust(30),
          str(d['available_devices_count']).ljust(10),
          str(d['busy_devices_count']).ljust(10),
          str(d['all_devices_count']).ljust(10))

  def _GetDeviceList(self):
    with appurify_sanitized.SanitizeLogging(self._verbose_count,
                                            logging.WARNING):
      dev_list_res = appurify_sanitized.api.devices_list(self._access_token)
    remote_device_helper.TestHttpResponse(dev_list_res,
                                         'Unable to generate access token.')
    return dev_list_res.json()['response']

  def _NoDeviceFound(self):
    self._PrintAvailableDevices(self._GetDeviceList())
    raise remote_device_helper.RemoteDeviceError(
        'No device found.', is_infra_error=True)

  @property
  def collect(self):
    return self._collect

  @property
  def device_type_id(self):
    return self._device['device_type_id']

  @property
  def network_config(self):
    return self._network_config

  @property
  def results_path(self):
    return self._results_path

  @property
  def runner_package(self):
    return self._runner_package

  @property
  def runner_type(self):
    return self._runner_type

  @property
  def timeouts(self):
    return self._timeouts

  @property
  def token(self):
    return self._access_token

  @property
  def trigger(self):
    return self._trigger

  @property
  def verbose_count(self):
    return self._verbose_count

  @property
  def device_type(self):
    return self._device_type
