#!/usr/bin/python
# -*- coding: utf-8 -*-
#

"""Command line tool to compile songbooks using the songbook library."""

import argparse
import json
import locale
import logging
import os.path
import textwrap
import sys

from songbook_core.build import buildsongbook
from songbook_core import __VERSION__
from songbook_core import errors


def argument_parser(args):
    """Parse argumnts"""
    parser = argparse.ArgumentParser(description="A song book compiler")

    parser.add_argument('--version', help='Show version', action='version',
            version='%(prog)s ' + __VERSION__)

    parser.add_argument('book', nargs=1, help=textwrap.dedent("""\
                    Book to compile.
            """))

    parser.add_argument('--datadir', '-d', nargs=1, type=str, action='store',
            help=textwrap.dedent("""\
                    Data location. Expected (not necessarily required)
                    subdirectories are 'songs', 'img', 'latex', 'templates'.
            """))

    options = parser.parse_args(args)

    return options


def main():
    """Main function:"""

    # Logging configuration
    logging.basicConfig(name='songbook')
    logger = logging.getLogger('songbook')

    # set script locale to match user's
    try:
        locale.setlocale(locale.LC_ALL, '')
    except locale.Error as error:
        # Locale is not installed on user's system, or wrongly configured.
        sys.stderr.write("Locale error: {}\n".format(error.message))

    options = argument_parser(sys.argv[1:])

    songbook_path = options.book[0]

    basename = os.path.basename(songbook_path)[:-3]

    with open(songbook_path) as songbook_file:
        songbook = json.load(songbook_file)

    if options.datadir is not None:
        songbook['datadir'] = options.datadir[0]
    elif 'datadir' in songbook.keys():
        if not os.path.isabs(songbook['datadir']):
            songbook['datadir'] = os.path.join(os.path.dirname(songbook_path),
                                               songbook['datadir']
                                               )
    else:
        songbook['datadir'] = os.path.dirname(songbook_path)
    try:
        buildsongbook(songbook, basename, interactive=True, logger=logger)
    except errors.SongbookError as error:
        logger.error(error)
        sys.exit(1)

    sys.exit(0)

if __name__ == '__main__':
    main()