#! /usr/bin/env python3

from pathlib import Path
import argparse
import logging
import sys
import os
import json


DEFAULT_CONFIG = {
    'trashes': [
        '$HOME/trash/',
    ]
}


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('names', nargs='+')
    return parser.parse_args()


def lowest_mount(path: Path) -> Path:
    """Find lowest level mount point of given path"""
    while not path.is_mount() and path.parent != path:
        return lowest_mount(path.parent)

    return path


def getconfig():
    config_file = Path('~/.config/trash.json').expanduser()
    config = DEFAULT_CONFIG
    if config_file.is_file():
        with open(config_file) as f:
            config.update(json.load(f))
    return config


def main():
    args = parse_args()
    logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)

    config = getconfig()
    logging.debug(config)

    trashes = []
    for trashdir in config['trashes']:
        trashdir = Path(os.path.expandvars(trashdir)).expanduser().resolve()
        if not trashdir.is_dir():
            logging.info(f'new trash created at {trashdir}.')
            trashdir.mkdir()
        trashes.append(trashdir)

    for name in args.names:
        name = Path(os.path.expandvars(name))

        if not (name.is_file() or name.is_dir()):
            logging.warning(f'{name} is not a file nor directory')
            continue

        name = name.absolute()

        trashed = False
        for trashdir in trashes:
            try:
                if lowest_mount(trashdir) == lowest_mount(name):
                    logging.info(f'Will move {name} to {trashdir}')
                    trashed = True
                    break
            except ValueError:
                pass

        if not trashed:
            logging.warning(f'Unable to trash {name}')


if __name__ == '__main__':
    main()