import argparse
import sys
from specs import parse_specs_file


# This just displays the error type and message, not the stack trace
def except_hook(ext_type, value, traceback):
    sys.stderr.write("{}: {}\n".format(ext_type.__name__, value))


sys.excepthook = except_hook


# Define parser
parser = argparse.ArgumentParser(
    description="Backup directories and Docker volumes."
)
parser.add_argument(
    "-f",
    "--file",
    action="append",
    dest="file",
    help="File containing spec definitions.",
)
parser.add_argument(
    "-j",
    "--json",
    action="store_const",
    const=True,
    default=False,
    help="Print out the parsed specs as JSON " "and exit",
)
parser.add_argument(
    "spec", nargs="*", help="The specs to process. Defaults to all."
)

# Parse arguments
args = parser.parse_args()
specs = sum([parse_specs_file(path) for path in args.file], [])

# Filter specs if needed
if args.spec:
    specs = filter(lambda s: s.name in args.spec, specs)

# Dump parsed data as json
if args.json:
    import json

    print(json.dumps([spec.to_dict() for spec in specs], indent=4))

else:
    pass
    # Run the backups
    # for spec in specs:
    #     spec.backup()