#!/usr/bin/env python
"""bcfg2-admin is a script that helps to administrate a Bcfg2 deployment."""

import sys
import logging
import Bcfg2.Server.Core
import Bcfg2.Logger
import Bcfg2.Options
import Bcfg2.Server.Admin
# Compatibility import
from Bcfg2.Bcfg2Py3k import StringIO

log = logging.getLogger('bcfg2-admin')

def mode_import(modename):
    """Load Bcfg2.Server.Admin.<mode>."""
    modname = modename.capitalize()
    mod = getattr(__import__("Bcfg2.Server.Admin.%s" %
                             (modname)).Server.Admin, modname)
    return getattr(mod, modname)

def get_modes():
    """Get all available modes, except for the base mode."""
    return [x.lower() for x in Bcfg2.Server.Admin.__all__ if x != 'mode']

def create_description():
    """Create the description string from the list of modes."""
    modes = get_modes()
    description = StringIO()
    description.write("Available modes are:\n\n")
    for mode in modes:
        try:
            description.write(("   %-15s   %s\n" %
                   (mode, mode_import(mode).__shorthelp__)))
        except (ImportError, SystemExit):
            pass
    return description.getvalue()

def main():
    optinfo = {
        'configfile': Bcfg2.Options.CFILE,
        'help': Bcfg2.Options.HELP,
        'verbose': Bcfg2.Options.VERBOSE,
        'repo': Bcfg2.Options.SERVER_REPOSITORY,
        'plugins': Bcfg2.Options.SERVER_PLUGINS,
        'event debug': Bcfg2.Options.DEBUG,
        'filemonitor': Bcfg2.Options.SERVER_FILEMONITOR,
        'password': Bcfg2.Options.SERVER_PASSWORD,
        'encoding': Bcfg2.Options.ENCODING,
        }
    setup = Bcfg2.Options.OptionParser(optinfo)
    # override default help message to include description of all modes
    setup.hm = "Usage:\n     %s\n%s" % (setup.buildHelpMessage(),
                                        create_description())
    setup.parse(sys.argv[1:])

    log_args = dict(to_syslog=False, to_console=logging.WARNING)
    if setup['verbose']:
        log_args['to_console'] = logging.DEBUG

    # Provide help if requested or no args were specified
    if (not setup['args'] or len(setup['args']) < 1 or
        setup['args'][0] == 'help' or setup['help']):
        if len(setup['args']) > 1:
            # Get help for a specific mode by passing it the help argument
            setup['args'] = [setup['args'][1], setup['args'][0]]
        else:
            # Print short help for all modes
            print(setup.hm)
            raise SystemExit(0)

    if setup['args'][0] in get_modes():
        modname = setup['args'][0].capitalize()
        if len(setup['args']) > 1 and setup['args'][1] == 'help':
            print(mode_import(modname).__longhelp__)
            raise SystemExit(0)
        try:
            mode_cls = mode_import(modname)
        except ImportError:
            e = sys.exc_info()[1]
            log.error("Failed to load admin mode %s: %s" % (modname, e))
            raise SystemExit(1)
        mode = mode_cls(setup)
        mode(setup['args'][1:])
        if hasattr(mode, 'bcore'):
            mode.bcore.shutdown()
    else:
        log.error("Unknown mode %s" % setup['args'][0])
        print("Usage:\n     %s" % setup.buildHelpMessage())
        print(create_description())
        raise SystemExit(1)

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        raise SystemExit(1)