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"""Application base class for displaying data.
"""
import abc
import logging

import pkg_resources

from .command import Command


LOG = logging.getLogger(__name__)


class DisplayCommandBase(Command):
    """Command base class for displaying data about a single object.
    """
    __metaclass__ = abc.ABCMeta

    def __init__(self, app, app_args):
        super(DisplayCommandBase, self).__init__(app, app_args)
        self.load_formatter_plugins()

    @abc.abstractproperty
    def formatter_namespace(self):
        "String specifying the namespace to use for loading formatter plugins."

    @abc.abstractproperty
    def formatter_default(self):
        "String specifying the name of the default formatter."

    def load_formatter_plugins(self):
        self.formatters = {}
        for ep in pkg_resources.iter_entry_points(self.formatter_namespace):
            try:
                self.formatters[ep.name] = ep.load()()
            except Exception as err:
                LOG.error(err)
                if self.app_args.debug:
                    raise
        return

    def get_parser(self, prog_name):
        parser = super(DisplayCommandBase, self).get_parser(prog_name)
        formatter_group = parser.add_argument_group(
            title='output formatters',
            description='output formatter options',
        )
        formatter_choices = sorted(self.formatters.keys())
        formatter_default = self.formatter_default
        if formatter_default not in formatter_choices:
            formatter_default = formatter_choices[0]
        formatter_group.add_argument(
            '-f', '--format',
            dest='formatter',
            action='store',
            choices=formatter_choices,
            default=formatter_default,
            help='the output format, defaults to %s' % formatter_default,
        )
        formatter_group.add_argument(
            '-c', '--column',
            action='append',
            default=[],
            dest='columns',
            metavar='COLUMN',
            help='specify the column(s) to include, can be repeated',
        )
        for name, formatter in sorted(self.formatters.items()):
            formatter.add_argument_group(parser)
        return parser

    @abc.abstractmethod
    def produce_output(self, parsed_args, column_names, data):
        """Use the formatter to generate the output.

        :param parsed_args: argparse.Namespace instance with argument values
        :param column_names: sequence of strings containing names
                             of output columns
        :param data: iterable with values matching the column names
        """

    def run(self, parsed_args):
        self.formatter = self.formatters[parsed_args.formatter]
        column_names, data = self.take_action(parsed_args)
        self.produce_output(parsed_args, column_names, data)
        return 0