import gettext
_ = gettext.gettext

# ICK.  Mutation, references, and hidden assignment.
def group_by(iterable, field_id):
    results = []
    keys = {}
    for obj in iterable:
        key = obj[field_id]
        if key in keys:
            keys[key].append(obj)
            continue
        keys[key] = [obj]
        results.append((key, keys[key]))
    return results

def print_report(results, unlintable_filenames, cant_lint_filenames,
                 broken_linter_names, unfindable_filenames, options = {'bylinter': True}):
    sort_position = 1
    grouping = _('Linter: {}')
    if 'byfile' in options:
        sort_position = 0
        grouping = _('Filename: {}')
    grouped_results = group_by(results, sort_position)
    for group in grouped_results:
        print(grouping.format(group[0]))
        for (filename, lintername, returncode, text) in group[1]:
            print('\n'.join(text))
        print('')
    if len(broken_linter_names):
        print(_('These linters could not be run:'), ','.join(broken_linter_names))
        if len(cant_lint_filenames):
            print(_('As a result, these files were not linted:'))
            print('\n'.join(['    {}'.format(f) for f in cant_lint_filenames]))
    if len(unlintable_filenames):
        print(_('The following files had no recognizeable linters:'))
        print('\n'.join(['    {}'.format(f) for f in unlintable_filenames]))
    if len(unfindable_filenames):
        print(_('The following files could not be found:'))
        print('\n'.join(['    {}'.format(f) for f in unfindable_filenames]))

        
def print_help(options, name):
    print(_('Usage: {} [options] [filenames]').format(name))
    for item in options:
        print(' -{:<1}  --{:<12}  {}'.format(item[0], item[1], item[3]))


def print_version(name, version):
    print(_('{} {} Copyright (c) 2009, 2016 Kennth M. "Elf" Sternberg')).format(name, version)


def print_linters(config, broken_linter_names):
    print(_('Currently supported linters:'))
    for linter in config:
        print('{:<14} {}'.format(linter.name,
                                 ((linter.name in broken_linter_names and
                                   _('(WARNING: executable not found)') or
                                   linter.linter.get('comment', '')))))