import argparse
import logging
import os
import sys
from .. import io

LOG = logging.getLogger()


def run(result_fn_list_fn, gathered_fn):
    thatdir = os.path.dirname(result_fn_list_fn)
    thisdir = os.path.dirname(gathered_fn)
    result_fn_list = io.deserialize(result_fn_list_fn)
    io.serialize(gathered_fn, result_fn_list)
    gathered_dn = os.path.dirname(gathered_fn)
    gathered = list()
    for result_fn in result_fn_list:
        some_results = io.deserialize(result_fn)
        d = os.path.abspath(os.path.dirname(result_fn))
        def abspath(v):
            if v.startswith('.'):
                return os.path.normpath(os.path.relpath(os.path.join(d, v), gathered_dn))
            else:
                return v # apparently not a path
        # By construction, this is a list of dicts of k:output,
        # where outputs are relative to the location of result_fn.
        some_abs_results = list()
        for one in some_results:
            for v in one.values():
                assert not v.startswith('/'), '{!r} was expected to be relative'.format(v)
            abs_one = {k: abspath(v) for k,v in list(one.items())}
            some_abs_results.append(abs_one)
        gathered.extend(some_abs_results)
    io.serialize(gathered_fn, gathered)


class HelpF(argparse.RawTextHelpFormatter, argparse.ArgumentDefaultsHelpFormatter):
    pass


def parse_args(argv):
    description = 'Gather the contents of contents of result-lists into a single gathered-list.'
    epilog = 'results-list is known already, so that is a pseudo output. Its filenames point to the actual, unknown results.'
    # Question: Do we need to know the wildcards for each result?
    parser = argparse.ArgumentParser(
        description=description,
        epilog=epilog,
        formatter_class=HelpF,
    )
    parser.add_argument(
        '--result-fn-list-fn',
        help='Input: Combined list of filenames of results (pseudo output, expected to exist already in our run-dir)')
    parser.add_argument(
        '--gathered-fn',
        help='Output: serialized something-or-other')
    args = parser.parse_args(argv[1:])
    return args


def main(argv=sys.argv):
    args = parse_args(argv)
    logging.basicConfig(level=logging.INFO)
    run(**vars(args))


if __name__ == '__main__':  # pragma: no cover
    main()