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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 absolute_import, print_function

import logging
import os
import sys
import time

from argparse import ArgumentParser

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
from itertools import chain


log_manager = LoggingManager()


ANDROID_IDE_ADVERTISEMENT = '''
=============
ADVERTISEMENT

You are building Firefox for Android. After your build completes, you
should run `mach gradle-install` to prepare Gradle and IntelliJ/Android Studio
integration. Then import the Gradle project at $OBJDIR/mobile/android/gradle
into the IDE of your choice.

PLEASE BE AWARE THAT GRADLE AND INTELLIJ/ANDROID STUDIO 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)

    default_backends = ['RecursiveMake']
    # We have a chicken/egg problem, where we only have a dict for substs after
    # creating the ConfigEnvironment, which requires argument parsing to have
    # occurred.
    for name, value in substs:
        if name == 'BUILD_BACKENDS':
            default_backends = value
            break

    parser = ArgumentParser()
    parser.add_argument('--recheck', dest='recheck', action='store_true',
                        help='update config.status by reconfiguring in the same conditions')
    parser.add_argument('-v', '--verbose', dest='verbose', action='store_true',
                        help='display verbose output')
    parser.add_argument('-n', dest='not_topobjdir', action='store_true',
                        help='do not consider current directory as top object directory')
    parser.add_argument('-d', '--diff', action='store_true',
                        help='print diffs of changed files.')
    parser.add_argument('-b', '--backend', nargs='+',
                        choices=['RecursiveMake', 'AndroidEclipse', 'CppEclipse',
                                 'VisualStudio', 'FasterMake', 'CompileDB'],
                        default=default_backends,
                        help='what backend to build (default: %s).' %
                        ' '.join(default_backends))
    options = 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.
    backends_cls = []
    for backend in options.backend:
        if 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.')
            backends_cls.append(AndroidEclipseBackend)
        elif backend == 'CppEclipse':
            from mozbuild.backend.cpp_eclipse import CppEclipseBackend
            backends_cls.append(CppEclipseBackend)
            if os.name == 'nt':
              raise Exception('Eclipse is not supported on Windows. Consider using Visual Studio instead.')
        elif backend == 'VisualStudio':
            from mozbuild.backend.visualstudio import VisualStudioBackend
            backends_cls.append(VisualStudioBackend)
        elif backend == 'FasterMake':
            from mozbuild.backend.fastermake import FasterMakeBackend
            backends_cls.append(FasterMakeBackend)
        elif backend == 'CompileDB':
            from mozbuild.compilation.database import CompileDBBackend
            backends_cls.append(CompileDBBackend)
        else:
            backends_cls.append(RecursiveMakeBackend)

    cpu_start = time.clock()
    time_start = time.time()

    backends = [cls(env) for cls in backends_cls]

    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)
    if len(backends) > 1:
        definitions = list(definitions)

    for the_backend in backends:
        the_backend.consume(definitions)

    execution_time = 0.0
    for obj in chain((reader, emitter), backends):
        summary = obj.summary()
        print(summary, file=sys.stderr)
        execution_time += summary.execution_time

    cpu_time = time.clock() - cpu_start
    wall_time = time.time() - time_start
    efficiency = cpu_time / wall_time if wall_time else 100
    untracked = wall_time - execution_time

    print(
        'Total wall time: {:.2f}s; CPU time: {:.2f}s; Efficiency: '
        '{:.0%}; Untracked: {:.2f}s'.format(
            wall_time, cpu_time, efficiency, untracked),
        file=sys.stderr
    )

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

    # Advertise Visual Studio if appropriate.
    if os.name == 'nt' and 'VisualStudio' not in options.backend:
        print(VISUAL_STUDIO_ADVERTISEMENT)

    # Advertise Eclipse if it is appropriate.
    if MachCommandConditions.is_android(env):
        if 'AndroidEclipse' not in options.backend:
            print(ANDROID_IDE_ADVERTISEMENT)