"""Actev module: merge-chunks

Actev modules are used to parse actev commands in order to get arguments
before calling associated entry point methods to execute systems.

Warning: this file should not be modified: see src/entry_points to add your
source code.
"""

from diva_evaluation_cli.bin.commands.actev_command import ActevCommand
from diva_evaluation_cli.src.entry_points.actev_merge_chunks import entry_point


class ActevMergeChunks(ActevCommand):
    """Given a list of chunk ids, merges all the chunks system output present
    in the list.

    Command args:
        * result-location or r: path to get the result of the chunks processing
        * chunk-file or c:      path to generate a chunk file, that summarizes
            all the processed videos/activities
        * output-file or o:     path to the output file generated
        * chunk-ids or i:       list of chunk ids
        * system-cache-dir or s:   path to system cache directory
    """

    def __init__(self):
        super(ActevMergeChunks, self).__init__('merge-chunks', entry_point)

    def cli_parser(self, arg_parser):
        """Configure the description and the arguments (positional and
        optional) to parse.

        Args:
            arg_parser(:obj:`ArgParser`): Python arg parser to describe how to
                parse the command

        """
        arg_parser.description = "Merge given chunk ids in a file and " \
                                 "output NIST compliant system file"
        required_named = arg_parser.add_argument_group(
            'required named arguments')

        required_named.add_argument("-r", "--result-location",
                                    help="path to the chunks merge result",
                                    required=True)
        required_named.add_argument("-o", "--output-file",
                                    help="path to save the output file",
                                    required=True)
        required_named.add_argument("-c", "--chunks-file",
                                    help="path to save the chunks in a json",
                                    required=True)
        arg_parser.add_argument("-i", "--chunk-ids", help="list of chunk ids",
                                nargs='+')
        arg_parser.add_argument("-s", "--system-cache-dir",
                                help="path to system cache directory")
        arg_parser.set_defaults(func=ActevMergeChunks.command, object=self)
