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

from optparse import OptionParser
import logging
import Bcfg2.Server.Core
import Bcfg2.Logger
import Bcfg2.Options
# Compatibility import
from Bcfg2.Bcfg2Py3k import StringIO

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

import Bcfg2.Server.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:
            continue
    return description.getvalue()

def main():
    Bcfg2.Logger.setup_logging('bcfg2-admin', to_console=True, level=40)
    usage = "Usage: %prog [options] MODE [args]"
    parser = OptionParser(usage=usage)
    parser.set_defaults(configfile=Bcfg2.Options.CFILE.default)
    parser.add_option("-C", "--configfile",
                      dest="configfile",
                      help="Path to bcfg2.conf",
                      metavar="FILE")
    parser.disable_interspersed_args()
    (options, args) = parser.parse_args()

    # Provide help if requested or no args were specified
    if len(args) < 1 or args[0] == 'help':
        if len(args) > 1:
            # Get help for a specific mode by passing it the help argument
            args = [args[1], args[0]]
        else:
            # Print short help for all modes
            parser.print_help()
            print(create_description())
            raise SystemExit(0)

    if args[0] in get_modes():
        modname = args[0].capitalize()
        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(options.configfile)
        mode(args[1:])
        if hasattr(mode, 'bcore'):
            mode.bcore.shutdown()
    else:
        log.error("Unknown mode %s" % args[0])
        parser.print_help()
        print(create_description())
        raise SystemExit(1)

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