#!/usr/bin/env python3

# Use sample:
# swh-hashtree --path . --ignore '.svn' --ignore '.git-svn' \
#    --ignore-empty-folders
# 38f8d2c3a951f6b94007896d0981077e48bbd702

import click
import os

from swh.model import from_disk, hashutil


def combine_filters(*filters):
    """Combine several ignore filters"""
    if len(filters) == 0:
        return from_disk.accept_all_directories
    elif len(filters) == 1:
        return filters[0]

    def combined_filter(*args, **kwargs):
        return all(filter(*args, **kwargs) for filter in filters)

    return combined_filter


@click.command()
@click.option('--path', default='.',
              help='Optional path to hash.')
@click.option('--ignore-empty-folder', is_flag=True, default=False,
              help='Ignore empty folder.')
@click.option('--ignore', multiple=True,
              help='Ignore pattern.')
def main(path, ignore_empty_folder=False, ignore=None):

    filters = []
    if ignore_empty_folder:
        filters.append(from_disk.ignore_empty_directories)
    if ignore:
        filters.append(
            from_disk.ignore_named_directories(
                [os.fsencode(name) for name in ignore]
            )
        )

    try:
        d = from_disk.Directory.from_disk(path=os.fsencode(path),
                                          dir_filter=combine_filters(*filters))
        hash = d.hash
    except Exception as e:
        print(e)
        return
    else:
        print(hashutil.hash_to_hex(hash))


if __name__ == '__main__':
    main()