#!/usr/bin/env python
"""Script to auto-generate our API docs.
"""

# stdlib imports
import sys
import re
import os
from os.path import join as pjoin

# local imports
from apigen import ApiDocWriter

# version comparison
from distutils.version import LooseVersion as V

# *****************************************************************************


def abort(error):
    print(f'*WARNING* API documentation not generated: {error}')
    exit(1)


if __name__ == '__main__':
    package = sys.argv[1]
    outdir = sys.argv[2]
    try:
        other_defines = sys.argv[3]
    except IndexError:
        other_defines = True
    else:
        other_defines = other_defines in ('True', 'true', '1')

    # Check that the package is available. If not, the API documentation is not
    # (re)generated and existing API documentation sources will be used.

    try:
        __import__(package)
    except ImportError as e:
        abort("Can not import " + package)

    module = sys.modules[package]

    # Check that the source version is equal to the installed
    # version. If the versions mismatch the API documentation sources
    # are not (re)generated. This avoids automatic generation of documentation
    # for older or newer versions if such versions are installed on the system.

    installed_version = V(module.__version__)

    version_file = pjoin('..', package, '_version.py')
    source_version = None
    if os.path.exists(version_file):
        # Versioneer
        from runpy import run_path
        try:
            source_version = run_path(version_file)['get_versions']()['version']
        except (FileNotFoundError, KeyError):
            pass
        if source_version == '0+unknown':
            source_version = None
    if source_version is None:
        # Legacy fall-back
        info_file = pjoin('..', package, 'info.py')
        info_lines = open(info_file).readlines()
        source_version = '.'.join([v.split('=')[1].strip(" '\n.")
                                   for v in info_lines if re.match(
                                           '^_version_(major|minor|micro|extra)', v
                                           )])
    print('***', source_version)

    if source_version != installed_version:
        abort("Installed version does not match source version")

    docwriter = ApiDocWriter(package, rst_extension='.rst',
                             other_defines=other_defines)
    docwriter.package_skip_patterns += [r'\.fixes$',
                                        r'\.fixes.*$',
                                        r'\.externals$',
                                        r'\.externals.*$',
                                        r'.*test.*$',
                                        r'\.info.*$',
                                        r'\.pkg_info.*$',
                                        r'\.py3k.*$',
                                        ]
    docwriter.write_api_docs(outdir)
    docwriter.write_index(outdir, 'index', relative_to=outdir)
    print('%d files written' % len(docwriter.written_modules))
