#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
#
from __future__ import print_function, unicode_literals

from collections import OrderedDict
import inspect
import optparse
import os
import sys

from librarian import packagers


if __name__ == '__main__':
    # Parse commandline arguments
    usage = """Usage: %prog [options] SOURCE [SOURCE...]
    Prepare SOURCE files for a partner."""

    parser = optparse.OptionParser(usage=usage)

    parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False,
        help='print status messages to stdout')
    parser.add_option('-O', '--output-dir', dest='output_dir', metavar='DIR', default='',
                      help='specifies the directory for output')
    parser.add_option('-f', '--force-overwrite',
        action='store_true',
        dest='overwrite',
        default=False,
        help='rebuild the file even if it already exists')
    parser.add_option('-p', '--packages',
        dest='packages',
        metavar='package,...',
        default='',
        help='lists packages to build')
    parser.add_option('-m', '--packages-modules',
        dest='packages_modules', metavar='path.to.module,...',
        default='librarian.partners',
        help='modules with packages definitions to load')
    parser.add_option('-l', '--list-packages',
        action='store_true',
        dest='list_packages',
        default=False,
        help='lists available packages')

    options, input_filenames = parser.parse_args()
    packages = OrderedDict()

    sys.path.insert(0, os.getcwd())
    for module_name in options.packages_modules.split(','):
        if not module_name:
            continue
        module = __import__(module_name, globals(), locals(), ['*'])
        for package_name in dir(module):
            package = getattr(module, package_name)
            if inspect.isclass(package) and issubclass(package, packagers.Packager):
                packages[package_name] = package
    if not packages:
        print('No packages found!')

    if options.list_packages:
        print('Available packages:')
        for package_name, package in packages.items():
            print(' ', package_name)
        exit(0)

    if len(input_filenames) < 1 or not options.packages:
        parser.print_help()
        exit(1)

    used_packages = [packages[p] for p in options.packages.split(',')]
    for package in used_packages:
        if options.verbose:
            print('Package:', package.__name__)
        package.prepare(input_filenames,
            options.output_dir, options.verbose, options.overwrite)