#!/usr/bin/env python

'''
Example custom dynamic inventory script for Ansible, in Python.
'''

from argparse import ArgumentParser
from json import load as json_load, dumps, JSONEncoder
from os import remove
from os.path import isfile
from traceback import print_exc
from sys import stderr, argv

from risotto.machine import load, TIRAMISU_CACHE, VALUES_CACHE, INFORMATIONS_CACHE, ROUGAIL_NAMESPACE, ROUGAIL_NAMESPACE_DESCRIPTION
from tiramisu import Config
from tiramisu.error import PropertiesOptionError
from rougail.utils import normalize_family
from rougail import RougailSystemdTemplate, RougailConfig
from rougail.template.base import RougailLeader, RougailExtra


DEBUG = False


class RougailEncoder(JSONEncoder):
    def default(self, obj):
        if isinstance(obj, RougailLeader):
            return obj._follower
        if isinstance(obj, RougailExtra):
            return obj._suboption
        if isinstance(obj, PropertiesOptionError):
            return 'PropertiesOptionError'
        return JSONEncoder.default(self, obj)


class RisottoInventory(object):
    def __init__(self):
        parser = ArgumentParser()
        parser.add_argument('--list', action='store_true')
        parser.add_argument('--host', action='store')
        parser.add_argument('--nocache', action='store_true')
        parser.add_argument('--debug', action='store_true')
        parser.add_argument('--pretty_print', action='store_true')
        parser.add_argument('--quiet', action='store_true')
        parser.add_argument('--server', action='store', default=None)
        self.args = parser.parse_args()
        if self.args.debug:
            global DEBUG
            DEBUG = True

    def run(self):
        if self.args.list and self.args.host:
            raise Exception('cannot have --list and --host together')
        if self.args.list or self.args.nocache:
            if isfile(TIRAMISU_CACHE):
                remove(TIRAMISU_CACHE)
            if isfile(VALUES_CACHE):
                remove(VALUES_CACHE)
            if isfile(INFORMATIONS_CACHE):
                remove(INFORMATIONS_CACHE)
        config = load(TIRAMISU_CACHE,
                      VALUES_CACHE,
                      INFORMATIONS_CACHE,
                      )
        if self.args.list:
            return self.do_inventory(config)
        elif self.args.host:
            return self.get_vars(config,
                                 self.args.host,
                                 self.args.server,
                                 )
        raise Exception('pfff')

    def do_inventory(self,
                     config: Config,
                     ) -> dict:
        servers = [subconfig.doc() for subconfig in config.option.list('optiondescription') if subconfig.information.get('module') == 'host']
        return dumps({
            'group': {
                'hosts': servers,
                'vars': {
                    # FIXME
#                    'ansible_ssh_host': '192.168.0.28',
                    'ansible_ssh_user': 'root',
                    'ansible_python_interpreter': '/usr/bin/python3'
                }
            }
        })

    def get_vars(self,
                 config: Config,
                 host_name: str,
                 only_server_name: str,
                 ) -> dict:
        ret = {}
        rougailconfig = RougailConfig.copy()
        rougailconfig['variable_namespace'] = ROUGAIL_NAMESPACE
        rougailconfig['variable_namespace_description'] = ROUGAIL_NAMESPACE_DESCRIPTION
        for subconfig in config.option.list('optiondescription'):
            server_name = subconfig.description() 
            module_name = subconfig.option(subconfig.information.get('provider:global:module_name')).value.get()
            if module_name == 'host' and server_name != host_name:
                continue
            engine = RougailSystemdTemplate(subconfig, rougailconfig)
            engine.load_variables(with_flatten=False)
            if module_name != 'host' and engine.rougail_variables_dict['general']['host'] != host_name:
                continue
            ret[server_name] = engine.rougail_variables_dict
        if only_server_name is None:
            ret['modules'] = config.information.get('modules')
            ret['delete_old_image'] = False
            ret['configure_host'] = True
            ret['only_machine'] = None
            ret['copy_templates'] = False
            ret['copy_tests'] = False
            ret['host_install_dir'] = ret[host_name]['general']['host_install_dir']
            return dumps(ret, cls=RougailEncoder)
        else:
            if only_server_name not in ret:
                raise Exception(f'cannot find server name "{only_server_name}" in {list(ret)}')
            return dumps(ret[only_server_name], cls=RougailEncoder)

      
# Get the inventory.
def main():
    try:
        inv = RisottoInventory()
        values = inv.run()
        if inv.args.pretty_print:
            from pprint import pprint
            from json import loads
            pprint(loads(values))
        elif not inv.args.quiet:
            print(values)
    except Exception as err:
        if DEBUG:
            print_exc()
            print('---', file=stderr)
            extra=''
        else:
            extra=f'\nmore informations with commandline "{" ".join(argv)} --debug"'
        print(f'{err}{extra}', file=stderr)
        exit(1)


main()