# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

@depends(host_for_sub_configure, target_for_sub_configure, check_build_environment,
         js_configure_args, prepare_mozconfig, old_configure,
         old_configure_assignments, '--cache-file')
@imports('errno')
@imports('logging')
@imports('os')
@imports('pickle')
@imports('sys')
@imports(_from='__main__', _import='config_status')
@imports(_from='__builtin__', _import='OSError')
@imports(_from='__builtin__', _import='open')
@imports(_from='__builtin__', _import='object')
@imports(_from='mozbuild.configure', _import='ConfigureSandbox')
@imports(_from='mozbuild.configure.util', _import='ConfigureOutputHandler')
def js_subconfigure(host, target, build_env, js_configure_args, mozconfig,
                    old_configure, old_configure_assignments, cache_file):

    class PrefixOutput(object):
        def __init__(self, prefix, fh):
            self._fh = fh
            self._begin_line = True
            self._prefix = prefix

        def write(self, content):
            if self._begin_line:
                self._fh.write(self._prefix)
            self._fh.write(('\n' + self._prefix).join(content.splitlines()))
            self._begin_line = content.endswith('\n')
            if self._begin_line:
                self._fh.write('\n')

        def flush(self):
            self._fh.flush()

    logger = logging.getLogger('moz.configure')
    formatter = logging.Formatter('js/src> %(levelname)s: %(message)s')
    for handler in logger.handlers:
        handler.setFormatter(formatter)
        if isinstance(handler, ConfigureOutputHandler):
            handler._stdout = PrefixOutput('js/src> ', handler._stdout)

    substs = dict(old_configure['substs'])
    assignments = dict(old_configure_assignments)
    environ = dict(os.environ)

    options = [host, target] +  js_configure_args

    options.append('--prefix=%s/dist' % build_env.topobjdir)

    if substs.get('ZLIB_IN_MOZGLUE'):
        substs['MOZ_ZLIB_LIBS'] = ''

    environ['MOZILLA_CENTRAL_PATH'] = build_env.topsrcdir
    if 'MOZ_BUILD_APP' in environ:
        del environ['MOZ_BUILD_APP']

    # Here, we mimic what we used to do from old-configure, which makes this
    # all awkward.

    # The following variables were saved at the beginning of old-configure,
    # and restored before invoking the subconfigure. Which means their value
    # should be taken from the old_configure_assignments or mozconfig.
    from_assignment = set(
        ('CC', 'CXX', 'CPPFLAGS', 'CFLAGS', 'CXXFLAGS', 'LDFLAGS', 'HOST_CC',
         'HOST_CXXFLAGS', 'HOST_LDFLAGS'))

    # Variables that were explicitly exported from old-configure, and those
    # explicitly set in the environment when invoking old-configure, were
    # automatically inherited from subconfigure. We assume the relevant ones
    # have a corresponding AC_SUBST in old-configure, making them available
    # in `substs`.
    for var in (
        'MOZ_SYSTEM_ZLIB', 'MOZ_ZLIB_CFLAGS', 'MOZ_ZLIB_LIBS',
        'MOZ_APP_NAME', 'MOZ_APP_REMOTINGNAME', 'MOZ_DEV_EDITION',
        'STLPORT_LIBS', 'DIST', 'MOZ_LINKER', 'ZLIB_IN_MOZGLUE', 'RANLIB',
        'AR', 'CPP', 'CC', 'CXX', 'CPPFLAGS', 'CFLAGS', 'CXXFLAGS',
        'LDFLAGS', 'HOST_CC', 'HOST_CXX', 'HOST_CPPFLAGS',
        'HOST_CXXFLAGS', 'HOST_LDFLAGS'
    ):
        if var not in from_assignment and var in substs:
            value = substs[var]
        elif var in assignments:
            value = assignments[var]
        elif mozconfig and var in mozconfig and \
                not mozconfig[var][1].startswith('removed'):
            value = mozconfig[var][0]
        else:
            continue
        if isinstance(value, list):
            value = ' '.join(value)
        environ[var] = value

    options.append('JS_STANDALONE=')

    srcdir = os.path.join(build_env.topsrcdir, 'js', 'src')
    objdir = os.path.join(build_env.topobjdir, 'js', 'src')

    data_file = os.path.join(objdir, 'configure.pkl')
    previous_args = None
    if os.path.exists(data_file):
        with open(data_file, 'rb') as f:
            previous_args = pickle.load(f)

    cache_file = cache_file[0] if cache_file else './config.cache'
    cache_file = os.path.join(build_env.topobjdir, cache_file)

    try:
        os.makedirs(objdir)
    except OSError as e:
        if e.errno != errno.EEXIST:
            raise

    with open(data_file, 'wb') as f:
        pickle.dump(options, f)

    # Only run configure if one of the following is true:
    # - config.status doesn't exist
    # - config.status is older than an input to configure
    # - the configure arguments changed
    configure = os.path.join(srcdir, 'old-configure')
    config_status_path = os.path.join(objdir, 'config.status')
    skip_configure = True
    if not os.path.exists(config_status_path):
        skip_configure = False
    else:
        config_status_deps = os.path.join(objdir, 'config_status_deps.in')
        if not os.path.exists(config_status_deps):
            skip_configure = False
        else:
            with open(config_status_deps, 'r') as fh:
                dep_files = fh.read().splitlines() + [configure]
            if (any(not os.path.exists(f) or
                    (os.path.getmtime(config_status_path) < os.path.getmtime(f))
                    for f in dep_files) or
                ((previous_args or options) != options)):
                skip_configure = False

    ret = 0
    if not skip_configure:
        oldpwd = os.getcwd()
        os.chdir(objdir)
        command = [
            os.path.join(build_env.topsrcdir, 'configure.py'),
            '--enable-project=js',
        ]
        environ['OLD_CONFIGURE'] = os.path.join(
            os.path.dirname(configure), 'old-configure')
        command += options
        command += ['--cache-file=%s' % cache_file]

        log.info('configuring')
        log.info('running %s' % ' '.join(command[:-1]))
        config = {}
        sandbox = ConfigureSandbox(config, environ, command, logger=logger)
        sandbox.run(os.path.join(build_env.topsrcdir, 'moz.configure'))
        ret = config_status(config)
        os.chdir(oldpwd)

    # Restore unprefixed logging.
    formatter = logging.Formatter('%(levelname)s: %(message)s')
    for handler in logger.handlers:
        handler.setFormatter(formatter)
        if isinstance(handler, ConfigureOutputHandler):
            handler._stdout.flush()
            handler._stdout = handler._stdout._fh

    return ret