#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

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# Interactive shell based on Django:
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"""
  CLI interface for nova bare-metal management.
"""

import ast
import errno
import gettext
import math
import netaddr
import optparse
import os
import sys


# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
    sys.path.insert(0, POSSIBLE_TOPDIR)

gettext.install('nova', unicode=1)

from nova import config
from nova import context
from nova import exception
from nova.openstack.common import cfg
from nova.openstack.common import cliutils
from nova.openstack.common import importutils
from nova.openstack.common import log as logging
from nova.openstack.common import rpc
from nova.openstack.common import timeutils
from nova import utils
from nova import version
from nova.virt.baremetal import db as bmdb
from nova.virt.baremetal.db import migration as bmdb_migration

CONF = cfg.CONF


# Decorators for actions
def args(*args, **kwargs):
    def _decorator(func):
        func.__dict__.setdefault('args', []).insert(0, (args, kwargs))
        return func
    return _decorator


class BareMetalDbCommands(object):
    """Class for managing the bare-metal database."""

    def __init__(self):
        pass

    @args('--version', dest='version', metavar='<version>',
            help='Bare-metal Database version')
    def sync(self, version=None):
        """Sync the database up to the most recent version."""
        bmdb_migration.db_sync(version)

    def version(self):
        """Print the current database version."""
        v = bmdb_migration.db_version()
        print(v)
        # return for unittest
        return v


CATEGORIES = {
    'db': BareMetalDbCommands,
}


def methods_of(obj):
    """Get all callable methods of an object that don't start with underscore
    returns a list of tuples of the form (method_name, method)"""
    result = []
    for i in dir(obj):
        if callable(getattr(obj, i)) and not i.startswith('_'):
            result.append((i, getattr(obj, i)))
    return result


def add_command_parsers(subparsers):
    parser = subparsers.add_parser('bash-completion')
    parser.add_argument('query_category', nargs='?')

    for category in CATEGORIES:
        command_object = CATEGORIES[category]()

        parser = subparsers.add_parser(category)
        parser.set_defaults(command_object=command_object)

        category_subparsers = parser.add_subparsers(dest='action')

        for (action, action_fn) in methods_of(command_object):
            parser = category_subparsers.add_parser(action)

            action_kwargs = []
            for args, kwargs in getattr(action_fn, 'args', []):
                action_kwargs.append(kwargs['dest'])
                kwargs['dest'] = 'action_kwarg_' + kwargs['dest']
                parser.add_argument(*args, **kwargs)

            parser.set_defaults(action_fn=action_fn)
            parser.set_defaults(action_kwargs=action_kwargs)

            parser.add_argument('action_args', nargs='*')


category_opt = cfg.SubCommandOpt('category',
                                 title='Command categories',
                                 help='Available categories',
                                 handler=add_command_parsers)


def main():
    """Parse options and call the appropriate class/method."""
    CONF.register_cli_opt(category_opt)
    try:
        config.parse_args(sys.argv)
        logging.setup("nova")
    except cfg.ConfigFilesNotFoundError:
        cfgfile = CONF.config_file[-1] if CONF.config_file else None
        if cfgfile and not os.access(cfgfile, os.R_OK):
            st = os.stat(cfgfile)
            print(_("Could not read %s. Re-running with sudo") % cfgfile)
            try:
                os.execvp('sudo', ['sudo', '-u', '#%s' % st.st_uid] + sys.argv)
            except Exception:
                print(_('sudo failed, continuing as if nothing happened'))

        print(_('Please re-run nova-manage as root.'))
        sys.exit(2)

    if CONF.category.name == "version":
        print(_("%(version)s (%(vcs)s)") %
               {'version': version.version_string(),
                'vcs': version.version_string_with_vcs()})
        sys.exit(0)

    if CONF.category.name == "bash-completion":
        if not CONF.category.query_category:
            print(" ".join(CATEGORIES.keys()))
        elif CONF.category.query_category in CATEGORIES:
            fn = CATEGORIES[CONF.category.query_category]
            command_object = fn()
            actions = methods_of(command_object)
            print(" ".join([k for (k, v) in actions]))
        sys.exit(0)

    fn = CONF.category.action_fn
    fn_args = [arg.decode('utf-8') for arg in CONF.category.action_args]
    fn_kwargs = {}
    for k in CONF.category.action_kwargs:
        v = getattr(CONF.category, 'action_kwarg_' + k)
        if v is None:
            continue
        if isinstance(v, basestring):
            v = v.decode('utf-8')
        fn_kwargs[k] = v

    # call the action with the remaining arguments
    # check arguments
    try:
        cliutils.validate_args(fn, *fn_args, **fn_kwargs)
    except cliutils.MissingArgs as e:
        print(fn.__doc__)
        parser.print_help()
        print(e)
        sys.exit(1)
    try:
        fn(*fn_args, **fn_kwargs)
        sys.exit(0)
    except Exception:
        print(_("Command failed, please check log for more info"))
        raise


if __name__ == '__main__':
    main()