# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import

import argparse
import sys

from .. import handlers, commandline, reader


def get_parser(add_help=True):
    parser = argparse.ArgumentParser(
        "format", description="Format a structured log stream", add_help=add_help
    )
    parser.add_argument(
        "--input",
        action="store",
        default=None,
        help="Filename to read from, defaults to stdin",
    )
    parser.add_argument(
        "--output",
        action="store",
        default=None,
        help="Filename to write to, defaults to stdout",
    )
    parser.add_argument(
        "format", choices=list(commandline.log_formatters.keys()), help="Format to use"
    )
    return parser


def main(**kwargs):
    if kwargs["input"] is None:
        input_file = sys.stdin
    else:
        input_file = open(kwargs["input"])
    if kwargs["output"] is None:
        output_file = sys.stdout
    else:
        output_file = open(kwargs["output"], "w")

    formatter = commandline.log_formatters[kwargs["format"]][0]()

    handler = handlers.StreamHandler(stream=output_file, formatter=formatter)

    for data in reader.read(input_file):
        handler(data)


if __name__ == "__main__":
    parser = get_parser()
    args = parser.parse_args()
    kwargs = vars(args)
    main(**kwargs)
