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

import hashlib
import imp
import os
import platform
import string
import subprocess
import sys

DART_DIR = os.path.abspath(
    os.path.normpath(os.path.join(__file__, '..', '..', '..')))

def GetUtils():
  '''Dynamically load the tools/utils.py python module.'''
  return imp.load_source('utils', os.path.join(DART_DIR, 'tools', 'utils.py'))

SYSTEM_RENAMES = {
  'win32': 'windows',
  'windows': 'windows',
  'win': 'windows',

  'linux': 'linux',
  'linux2': 'linux',
  'lucid32': 'linux',
  'lucid64': 'linux',

  'darwin': 'macos',
  'mac': 'macos',
  'macos': 'macos',
}

ARCH_RENAMES = {
  '32': 'ia32',
  'ia32': 'ia32',

  '64': 'x64',
  'x64': 'x64',
}

class Channel(object):
  BLEEDING_EDGE = 'be'
  DEV = 'dev'
  STABLE = 'stable'
  TRY = 'try'
  INTEGRATION = 'integration'
  ALL_CHANNELS = [BLEEDING_EDGE, DEV, STABLE, TRY, INTEGRATION]

class ReleaseType(object):
  RAW = 'raw'
  SIGNED = 'signed'
  RELEASE = 'release'
  ALL_TYPES = [RAW, SIGNED, RELEASE]

class Mode(object):
  RELEASE = 'release'
  DEBUG = 'debug'
  ALL_MODES = [RELEASE, DEBUG]

class GCSNamer(object):
  """
  This class is used for naming objects in our "gs://dart-archive/"
  GoogleCloudStorage bucket. It's structure is as follows:

  For every (channel,revision,release-type) tuple we have a base path:

    gs://dart-archive/channels/{be,dev,stable,try,integration}
                     /{raw,signed,release}/{revision,latest}/

  Under every base path, the following structure is used:
    - /VERSION
    - /api-docs/dartdocs-gen-api.zip
    - /sdk/dartsdk-{linux,macos,windows}-{ia32,x64}-release.zip
    - /editor/darteditor-{linux,macos,windows}-{ia32,x64}.zip
    - /editor/darteditor-installer-macos-{ia32,x64}.dmg
    - /editor/darteditor-installer-windows-{ia32,x64}.msi
    - /editor-eclipse-update
         /{index.html,features/,plugins/,artifacts.jar,content.jar}
  """
  def __init__(self, channel=Channel.BLEEDING_EDGE,
      release_type=ReleaseType.RAW, internal=False):
    assert channel in Channel.ALL_CHANNELS
    assert release_type in ReleaseType.ALL_TYPES

    self.channel = channel
    self.release_type = release_type
    if internal:
      self.bucket = 'gs://dart-archive-internal'
    else:
      self.bucket = 'gs://dart-archive'

  # Functions for quering complete gs:// filepaths

  def version_filepath(self, revision):
    return '%s/channels/%s/%s/%s/VERSION' % (self.bucket, self.channel,
        self.release_type, revision)

  def editor_zipfilepath(self, revision, system, arch):
    return '/'.join([self.editor_directory(revision),
      self.editor_zipfilename(system, arch)])

  def editor_installer_filepath(self, revision, system, arch, extension):
    return '/'.join([self.editor_directory(revision),
      self.editor_installer_filename(system, arch, extension)])

  def editor_android_zipfilepath(self, revision):
    return '/'.join([self.editor_directory(revision),
      self.editor_android_zipfilename()])

  def sdk_zipfilepath(self, revision, system, arch, mode):
    return '/'.join([self.sdk_directory(revision),
      self.sdk_zipfilename(system, arch, mode)])

  def unstripped_filepath(self, revision, system, arch):
    return '/'.join([self._variant_directory('unstripped', revision),
                     system,
                     arch,
                     self.unstripped_filename(system)])

  def apidocs_zipfilepath(self, revision):
    return '/'.join([self.apidocs_directory(revision),
      self.dartdocs_zipfilename()])

  # Functions for querying gs:// directories

  def sdk_directory(self, revision):
    return self._variant_directory('sdk', revision)

  def linux_packages_directory(self, revision):
    return '/'.join([self._variant_directory('linux_packages', revision)])

  def src_directory(self, revision):
    return self._variant_directory('src', revision)

  def editor_directory(self, revision):
    return self._variant_directory('editor', revision)

  def editor_eclipse_update_directory(self, revision):
    return self._variant_directory('editor-eclipse-update', revision)

  def apidocs_directory(self, revision):
    return self._variant_directory('api-docs', revision)

  def misc_directory(self, revision):
    return self._variant_directory('misc', revision)

  def _variant_directory(self, name, revision):
    return '%s/channels/%s/%s/%s/%s' % (self.bucket, self.channel,
        self.release_type, revision, name)

  # Functions for quering filenames

  def dartdocs_zipfilename(self):
    return 'dartdocs-gen-api.zip'

  def editor_zipfilename(self, system, arch):
    return 'darteditor-%s-%s.zip' % (
        SYSTEM_RENAMES[system], ARCH_RENAMES[arch])

  def editor_android_zipfilename(self):
    return 'android.zip'

  def editor_installer_filename(self, system, arch, extension):
    assert extension in ['dmg', 'msi']
    return 'darteditor-installer-%s-%s.%s' % (
        SYSTEM_RENAMES[system], ARCH_RENAMES[arch], extension)

  def sdk_zipfilename(self, system, arch, mode):
    assert mode in Mode.ALL_MODES
    return 'dartsdk-%s-%s-%s.zip' % (
        SYSTEM_RENAMES[system], ARCH_RENAMES[arch], mode)

  def unstripped_filename(self, system):
    return 'dart.exe' if system.startswith('win') else 'dart'

class GCSNamerApiDocs(object):
  def __init__(self, channel=Channel.BLEEDING_EDGE):
    assert channel in Channel.ALL_CHANNELS

    self.channel = channel
    self.bucket = 'gs://dartlang-api-docs'

  def dartdocs_dirpath(self, revision):
    assert len('%s' % revision) > 0
    if self.channel == Channel.BLEEDING_EDGE:
      return '%s/gen-dartdocs/builds/%s' % (self.bucket, revision)
    return '%s/gen-dartdocs/%s/%s' % (self.bucket, self.channel, revision)

  def docs_latestpath(self, revision):
    assert len('%s' % revision) > 0
    return '%s/channels/%s/latest.txt' % (self.bucket, self.channel)

def run(command, env=None, shell=False, throw_on_error=True):
  print "Running command: ", command

  p = subprocess.Popen(command, stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE, env=env, shell=shell)
  (stdout, stderr) = p.communicate()
  if throw_on_error and p.returncode != 0:
    print >> sys.stderr, "Failed to execute '%s'. Exit code: %s." % (
        command, p.returncode)
    print >> sys.stderr, "stdout: ", stdout
    print >> sys.stderr, "stderr: ", stderr
    raise Exception("Failed to execute %s." % command)
  return (stdout, stderr, p.returncode)

class GSUtil(object):
  GSUTIL_IS_SHELL_SCRIPT = False
  GSUTIL_PATH = None
  USE_DART_REPO_VERSION = False

  def _layzCalculateGSUtilPath(self):
    if not GSUtil.GSUTIL_PATH:
      buildbot_gsutil = '/b/build/scripts/slave/gsutil'
      if platform.system() == 'Windows':
        buildbot_gsutil = 'e:\\\\b\\build\\scripts\\slave\\gsutil'
      if os.path.isfile(buildbot_gsutil) and not GSUtil.USE_DART_REPO_VERSION:
        GSUtil.GSUTIL_IS_SHELL_SCRIPT = True
        GSUtil.GSUTIL_PATH = buildbot_gsutil
      else:
        dart_gsutil = os.path.join(DART_DIR, 'third_party', 'gsutil', 'gsutil')
        if os.path.isfile(dart_gsutil):
          GSUtil.GSUTIL_IS_SHELL_SCRIPT = False
          GSUtil.GSUTIL_PATH = dart_gsutil
        elif GSUtil.USE_DART_REPO_VERSION:
          raise Exception("Dart repository version of gsutil required, "
                          "but not found.")
        else:
          # We did not find gsutil, look in path
          possible_locations = list(os.environ['PATH'].split(os.pathsep))
          for directory in possible_locations:
            location = os.path.join(directory, 'gsutil')
            if os.path.isfile(location):
              GSUtil.GSUTIL_IS_SHELL_SCRIPT = False
              GSUtil.GSUTIL_PATH = location
              break
      assert GSUtil.GSUTIL_PATH

  def execute(self, gsutil_args):
    self._layzCalculateGSUtilPath()

    if GSUtil.GSUTIL_IS_SHELL_SCRIPT:
      gsutil_command = [GSUtil.GSUTIL_PATH]
    else:
      gsutil_command = [sys.executable, GSUtil.GSUTIL_PATH]

    return run(gsutil_command + gsutil_args,
               shell=(GSUtil.GSUTIL_IS_SHELL_SCRIPT and
                      sys.platform == 'win32'))

  def upload(self, local_path, remote_path, recursive=False,
             public=False, multithread=False):
    assert remote_path.startswith('gs://')

    if multithread:
      args = ['-m', 'cp']
    else:
      args = ['cp']
    if public:
      args += ['-a', 'public-read']
    if recursive:
      args += ['-R']
    args += [local_path, remote_path]
    self.execute(args)

  def cat(self, remote_path):
    assert remote_path.startswith('gs://')

    args = ['cat', remote_path]
    (stdout, _, _) = self.execute(args)
    return stdout

  def setGroupReadACL(self, remote_path, group):
    args = ['acl', 'ch', '-g', '%s:R' % group, remote_path]
    self.execute(args)

  def setContentType(self, remote_path, content_type):
    args = ['setmeta', '-h', 'Content-Type:%s' % content_type, remote_path]
    self.execute(args)

  def remove(self, remote_path, recursive=False):
    assert remote_path.startswith('gs://')

    args = ['rm']
    if recursive:
      args += ['-R']
    args += [remote_path]
    self.execute(args)

def CalculateMD5Checksum(filename):
  """Calculate the MD5 checksum for filename."""

  md5 = hashlib.md5()

  with open(filename, 'rb') as f:
    data = f.read(65536)
    while len(data) > 0:
      md5.update(data)
      data = f.read(65536)

  return md5.hexdigest()

def CalculateSha256Checksum(filename):
  """Calculate the sha256 checksum for filename."""

  sha = hashlib.sha256()

  with open(filename, 'rb') as f:
    data = f.read(65536)
    while len(data) > 0:
      sha.update(data)
      data = f.read(65536)

  return sha.hexdigest()

def CreateMD5ChecksumFile(filename, mangled_filename=None):
  """Create and upload an MD5 checksum file for filename."""
  if not mangled_filename:
    mangled_filename = os.path.basename(filename)

  checksum = CalculateMD5Checksum(filename)
  checksum_filename = '%s.md5sum' % filename

  with open(checksum_filename, 'w') as f:
    f.write('%s *%s' % (checksum, mangled_filename))

  print "MD5 checksum of %s is %s" % (filename, checksum)
  return checksum_filename

def CreateSha256ChecksumFile(filename, mangled_filename=None):
  """Create and upload an sha256 checksum file for filename."""
  if not mangled_filename:
    mangled_filename = os.path.basename(filename)

  checksum = CalculateSha256Checksum(filename)
  checksum_filename = '%s.sha256sum' % filename

  with open(checksum_filename, 'w') as f:
    f.write('%s *%s' % (checksum, mangled_filename))

  print "SHA256 checksum of %s is %s" % (filename, checksum)
  return checksum_filename

def GetChannelFromName(name):
  """Get the channel from the name. Bleeding edge builders don't
      have a suffix."""
  channel_name = string.split(name, '-').pop()
  if channel_name in Channel.ALL_CHANNELS:
    return channel_name
  return Channel.BLEEDING_EDGE

def GetSystemFromName(name):
  """Get the system from the name."""
  for part in string.split(name, '-'):
    if part in SYSTEM_RENAMES: return SYSTEM_RENAMES[part]

  raise ValueError("Bot name '{}' does not have a system name in it.".format(name))