#!/usr/bin/env python
# Copyright (c) 2012 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.

# pylint: disable=C0323

"""Utility routines for the buildrunner (runbuild.py)."""

import json
import os
import sys

from common import chromium_utils
from slave import slave_utils


class LogClass(chromium_utils.RunCommandFilter):
  """Collection of methods to log via annotator or logfile."""

  def __init__(self, outstream):
    self.outstream = outstream
    chromium_utils.RunCommandFilter.__init__(self)

  def log_to_file_internal(self, chunk):
    print >>self.outstream, chunk,

  # for use with Buildbot callback updates
  def log_to_file(self, data):
    if 'stdout' in data:
      self.log_to_file_internal(data['stdout'])
    if 'header' in data:
      self.log_to_file_internal(data['header'] + '\n')

    if 'elapsed' in data:
      print >>sys.stderr, '(took %.2fs)' % float(data['elapsed'])

  # for use with RunCommand's filter_obj
  def FilterLine(self, data):
    self.log_to_file_internal(data)
    return None

  def FilterDone(self, data):
    self.log_to_file_internal(data + '\n')
    return None


def step_skip_filter(item, step_regex, step_reject):
  """Provide common step/command filtering logic."""
  return ((step_regex and not step_regex.search(item)) or
          (step_reject and step_reject.search(item)))


def FilterCommands(commands, step_regex, step_reject):
  """Filter commands based on regex/reject.

  Returns (skip, command) for each command.
  """
  def filter_func(cmd):
    skip = (step_skip_filter(cmd['name'], step_regex, step_reject) or
            not cmd['doStep'])

    if skip and (cmd['doStep'] is None):
      skip = None
    return skip

  return list((filter_func(cmd), cmd) for cmd in commands)


def Execute(commands, annotate, log, fail_fast=False):
  """Given a list of (skip, command) pairs, execute commands sequentially.

  A command is specified as a hash with name, command, workdir, quoted_workdir,
  quoted_command, and env. quoted_workdir and _command are suitably
  shell-escaped. step_regex will filter steps by the supplied regex, while
  step_reject will reject steps based on the supplied regex. annotate will turn
  on annotator-compatible annotations per step. log is a stream to write the
  output of each command's execution.

  If any command returns with a nonzero return code, execution is aborted.

  Returns the number of successfully executed commands and whether execution was
  aborted early or not.
  """
  for skip, command in commands:
    # Don't execute non-buildrunner steps.
    if skip is None:
      continue
    print '@@@SEED_STEP %s@@@' % command['name']
    if skip:
      print '@@@SEED_STEP_TEXT@%s@skipped@@@' % command['name']

  commands_executed = 0
  err = False
  for skip, command in commands:
    if skip is None:
      continue
    if skip:
      if not annotate:
        print >>sys.stderr, 'skipping step: ' + command['name']
      continue

    if not annotate:
      print >>sys.stderr, 'running step: %s' % command['name']
    else:
      print '@@@STEP_CURSOR %s@@@' % command['name']
      print '@@@STEP_STARTED@@@'

    print >>log, '(in %s): %s' % (command['quoted_workdir'],
                                  command['quoted_command'])


    env = os.environ.copy()
    env.update(command['env'])
    env['PYTHONUNBUFFERED'] = '1'

    mylogger = LogClass(log)

    ret = chromium_utils.RunCommand(command['command'],
                                    cwd=command['workdir'],
                                    env=env,
                                    filter_obj=mylogger,
                                    print_cmd=False,
                                    timeout=command.get('timeout'),
                                    max_time=command.get('maxTime'))
    commands_executed += 1
    if ret != 0:
      if ret == slave_utils.WARNING_EXIT_CODE:
        if annotate:
          print '@@@STEP_WARNINGS@@@'
        continue
      else:
        if annotate:
          print '@@@STEP_FAILURE@@@'
        err = True
    print '@@@STEP_CLOSED@@@'
    if (fail_fast or command['haltOnFailure']) and err:
      break
  return commands_executed, err


def PropertiesToJSON(props):
  """Output a set of properties in JSON format."""
  propdict = props.asDict()
  cleandict = {}
  for k in propdict:
    cleandict[k] = propdict[k][0]

  return json.dumps(cleandict)