#!/usr/bin/python3

from contextlib import suppress
from lintian_brush.yaml import YamlUpdater
from lintian_brush.fixer import report_result, warn
import sys

try:
    from Levenshtein import distance
except ImportError:
    sys.exit(2)

valid_field_names = {
    'Archive',
    'ASCL-Id',
    'Bug-Database',
    'Bug-Submit',
    'Cite-As',
    'Changelog',
    'CPE',
    'Documentation',
    'Donation',
    'FAQ',
    'Funding',
    'Gallery',
    'Other-References',
    'Reference',
    'Registration',
    'Registry',
    'Repository',
    'Repository-Browse',
    'Screenshots',
    'Security-Contact',
    'Webservice',
}

typo_fixed = set()
case_fixed = set()

with suppress(FileNotFoundError), \
        YamlUpdater('debian/upstream/metadata') as updater:
    for field in updater.code:
        if field in valid_field_names:
            continue
        if (field.startswith('X-') and
                field[2:] in valid_field_names):
            if field[2:] in updater.code:
                warn('Both %s and %s exist.' % (
                     field, field[2:]))
                continue
            value = updater.code[field]
            del updater.code[field]
            updater.code[field[2:]] = value
            typo_fixed.add((field, field[2:]))
            continue

        for option in valid_field_names:
            if distance(field, option) == 1:
                value = updater.code[field]
                del updater.code[field]
                updater.code[option] = value
                if option.lower() == field.lower():
                    case_fixed.add((field, option))
                else:
                    typo_fixed.add((field, option))
                break


if case_fixed:
    kind = 'case' + ('s' if len(case_fixed) > 1 else '')
else:
    kind = ''
if typo_fixed:
    if case_fixed:
        kind += ' and '
    kind += 'typo' + ('s' if len(typo_fixed) > 1 else '')

fixed_str = ', '.join(
    ['%s ⇒ %s' % (old, new)
     for (old, new) in sorted(list(case_fixed) + list(typo_fixed))])

report_result(
    'Fix field name %s in debian/upstream/metadata (%s).' % (kind, fixed_str))
