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# 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/.

# Combined with build/autoconf/config.status.m4, ConfigStatus is an almost
# drop-in replacement for autoconf 2.13's config.status, with features
# borrowed from autoconf > 2.5, and additional features.

from __future__ import print_function

import logging
import os
import sys

from optparse import OptionParser

from mach.logging import LoggingManager
from mozbuild.backend.configenvironment import ConfigEnvironment
from mozbuild.backend.recursivemake import RecursiveMakeBackend
from mozbuild.base import MachCommandConditions
from mozbuild.frontend.emitter import TreeMetadataEmitter
from mozbuild.frontend.reader import BuildReader
from mozbuild.mozinfo import write_mozinfo


log_manager = LoggingManager()


ANDROID_ECLIPSE_ADVERTISEMENT = '''
=============
ADVERTISEMENT

You are building Firefox for Android. You might want to run
`mach build-backend --backend=AndroidEclipse`
to generate Eclipse project files.

PLEASE BE AWARE THAT ECLIPSE SUPPORT IS EXPERIMENTAL. You should
verify any changes using |mach build|.
=============
'''.strip()

VISUAL_STUDIO_ADVERTISEMENT = '''
===============================
Visual Studio Support Available

You are building Firefox on Windows. Please help us test the experimental
Visual Studio project files (yes, IntelliSense works) by running the
following:

   mach build-backend --backend=VisualStudio

===============================
'''.strip()


def config_status(topobjdir='.', topsrcdir='.',
        defines=[], non_global_defines=[], substs=[], source=None):
    '''Main function, providing config.status functionality.

    Contrary to config.status, it doesn't use CONFIG_FILES or CONFIG_HEADERS
    variables.

    Without the -n option, this program acts as config.status and considers
    the current directory as the top object directory, even when config.status
    is in a different directory. It will, however, treat the directory
    containing config.status as the top object directory with the -n option.

    The --recheck option, like with the original config.status, runs configure
    again, with the options given in the "ac_configure_args" subst.

    The options to this function are passed when creating the
    ConfigEnvironment. These lists, as well as the actual wrapper script
    around this function, are meant to be generated by configure.
    See build/autoconf/config.status.m4.
    '''

    if 'CONFIG_FILES' in os.environ:
        raise Exception('Using the CONFIG_FILES environment variable is not '
            'supported.')
    if 'CONFIG_HEADERS' in os.environ:
        raise Exception('Using the CONFIG_HEADERS environment variable is not '
            'supported.')

    if not os.path.isabs(topsrcdir):
        raise Exception('topsrcdir must be defined as an absolute directory: '
            '%s' % topsrcdir)

    parser = OptionParser()
    parser.add_option('--recheck', dest='recheck', action='store_true',
                      help='update config.status by reconfiguring in the same conditions')
    parser.add_option('-v', '--verbose', dest='verbose', action='store_true',
                      help='display verbose output')
    parser.add_option('-n', dest='not_topobjdir', action='store_true',
                      help='do not consider current directory as top object directory')
    parser.add_option('-d', '--diff', action='store_true',
                      help='print diffs of changed files.')
    parser.add_option('-b', '--backend',
                      choices=['RecursiveMake', 'AndroidEclipse', 'CppEclipse', 'VisualStudio'],
                      default='RecursiveMake',
                      help='what backend to build (default: RecursiveMake).')
    options, args = parser.parse_args()

    # Without -n, the current directory is meant to be the top object directory
    if not options.not_topobjdir:
        topobjdir = os.path.abspath('.')

    env = ConfigEnvironment(topsrcdir, topobjdir, defines=defines,
            non_global_defines=non_global_defines, substs=substs, source=source)

    # mozinfo.json only needs written if configure changes and configure always
    # passes this environment variable.
    if 'WRITE_MOZINFO' in os.environ:
        write_mozinfo(os.path.join(topobjdir, 'mozinfo.json'), env, os.environ)

    # Make an appropriate backend instance, defaulting to RecursiveMakeBackend.
    backend_cls = RecursiveMakeBackend
    if options.backend == 'AndroidEclipse':
        from mozbuild.backend.android_eclipse import AndroidEclipseBackend
        if not MachCommandConditions.is_android(env):
            raise Exception('The Android Eclipse backend is not available with this configuration.')
        backend_cls = AndroidEclipseBackend
    elif options.backend == 'CppEclipse':
        from mozbuild.backend.cpp_eclipse import CppEclipseBackend
        backend_cls = CppEclipseBackend
        if os.name == 'nt':
          raise Exception('Eclipse is not supported on Windows. Consider using Visual Studio instead.')
    elif options.backend == 'VisualStudio':
        from mozbuild.backend.visualstudio import VisualStudioBackend
        backend_cls = VisualStudioBackend

    the_backend = backend_cls(env)

    reader = BuildReader(env)
    emitter = TreeMetadataEmitter(env)
    # This won't actually do anything because of the magic of generators.
    definitions = emitter.emit(reader.read_topsrcdir())

    if options.recheck:
        # Execute configure from the top object directory
        os.chdir(topobjdir)
        os.execlp('sh', 'sh', '-c', ' '.join([os.path.join(topsrcdir, 'configure'), env.substs['ac_configure_args'], '--no-create', '--no-recursion']))

    log_level = logging.DEBUG if options.verbose else logging.INFO
    log_manager.add_terminal_logging(level=log_level)
    log_manager.enable_unstructured()

    print('Reticulating splines...', file=sys.stderr)
    summary = the_backend.consume(definitions)

    for line in summary.summaries():
        print(line, file=sys.stderr)

    if options.diff:
        for path, diff in sorted(summary.file_diffs.items()):
            print('\n'.join(diff))

    # Advertise Visual Studio if appropriate.
    if os.name == 'nt' and options.backend == 'RecursiveMake':
        print(VISUAL_STUDIO_ADVERTISEMENT)

    # Advertise Eclipse if it is appropriate.
    if MachCommandConditions.is_android(env):
        if options.backend == 'RecursiveMake':
            print(ANDROID_ECLIPSE_ADVERTISEMENT)