#!/usr/bin/python

# coding=utf-8

'''
redfish-check_cartridge ::
This is a small program to check cartridge changes in HEP moonshot chassis.
'''

from __future__ import unicode_literals
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import
from future import standard_library
from builtins import str
from builtins import object

import os
import sys
import json
import docopt
import logging
import configparser
import requests.packages.urllib3
import redfish
standard_library.install_aliases()


class InventoryFile(object):
    '''redfisht-client inventory file management'''
    def __init__(self, inventory_file):
        '''Initialize the inventory file

        Open and load configuration file data.
        If the file does not exist create an empty one ready to receive data

        :param inventory_file: File name of the configuration file
                            default: ~/.redfish/inventory
        :type config-file: str
        :returns: Nothing

        '''
        self._inventory_file = inventory_file
        # read json file
        try:
            with open(self._inventory_file) as json_data:
                self.data = json.load(json_data)
                json_data.close()
        except (ValueError, IOError):
            self.data = {'Managers': {}}

    def save(self):
        '''Save the configuration file data'''
        try:
            with open(self._inventory_file, 'w') as json_data:
                json.dump(self.data, json_data)
                json_data.close()
        except IOError as e:
            print(e.msg)
            sys.exit(1)

    def manager_incorect(self, exception):
        ''' Log and exit if manager name is incorect'''
        logger.error('Incorrect manager name : %s' % exception.args)
        sys.exit(1)

    def check_manager(self, manager_name):
        '''Check if the manager exists in configuration file

        :param manager_name: Name of the manager
        :type manager_name: str

        '''
        try:
            if manager_name not in self.get_managers():
                raise KeyError(manager_name)
        except KeyError as e:
            self.manager_incorect(e)

    def add_manager(self, manager_name, url, login, password):
        '''Add a manager to the configuration file

        :param manager_name: Name of the manager
        :type manager_name: str
        :param url: Url of the manager
        :type url: str
        :param login: Login of the manager
        :type login: str
        :param password: Password of the manager
        :type password: str

        '''

        self.data['Managers'][manager_name] = {}
        self.data['Managers'][manager_name]['url'] = url
        if login is None:
            login = ''
        if password is None:
            password = ''
        self.data['Managers'][manager_name]['login'] = login
        self.data['Managers'][manager_name]['password'] = password

    def modify_manager(self, manager_name, parameter, parameter_value):
        '''Modify the manager settings

        :param manager_name: Name of the manager
        :type manager_name: str
        :param parameter: url | login | password
        :type url: str
        :param parameter_value: Value of the parameter
        :type parameter_value: str
        :returns: Nothing

        '''

        if parameter == 'url':
            try:
                self.data['Managers'][manager_name]['url'] = parameter_value
            except KeyError as e:
                self.manager_incorect(e)
        elif parameter == 'login':
            try:
                self.data['Managers'][manager_name]['login'] = parameter_value
            except KeyError as e:
                self.manager_incorect(e)
        elif parameter == 'password':
            try:
                self.data['Managers'][manager_name]['password'] \
                    = parameter_value
            except KeyError as e:
                self.manager_incorect(e)
        elif parameter == 'manager_name':
            # Create a new entry with the new name
            self.add_manager(parameter_value,
                             self.data['Managers'][manager_name]['url'],
                             self.data['Managers'][manager_name]['login'],
                             self.data['Managers'][manager_name]['password'],
                             )
            # Remove the previous one
            self.delete_manager(manager_name)

    def delete_manager(self, manager_name):
        '''Delete manager

        :param manager_name: Name of the manager
        :type manager_name: str
        :returns: Nothing

        '''

        try:
            del self.data['Managers'][manager_name]
        except KeyError as e:
            self.manager_incorect(e)

    def get_managers(self):
        '''Get manager configured

        :returns: Managers
        :type returns: list

        '''
        managers = []
        for manager in self.data['Managers']:
            managers += [manager]
        return(managers)

    def get_manager_info(self, manager):
        '''Show manager info (url, login, password)

        :param manager: Name of the manager
        :type manager: str
        :returns: info containing url, login, password
        :type returns: dict

        '''
        info = {}
        url = self.data['Managers'][manager]['url']
        login = self.data['Managers'][manager]['login']
        password = self.data['Managers'][manager]['password']
        info = {'url': url, 'login': login, 'password': password}
        return(info)


class RedfishClientException(Exception):

    '''Base class for redfish client exceptions'''

    def __init__(self, message=None, **kwargs):
        self.kwargs = kwargs
        self.message = message


if __name__ == '__main__':
    '''Main application check_cartridge'''
    # Functions
    def get_redfish_data(connection_parameters, check_SSL):
        if not connection_parameters['login']:
            simulator = True
            enforceSSL = False
        else:
            simulator = False
            enforceSSL = True
        try:
            redfish_data = redfish.connect(connection_parameters['url'],
                                           connection_parameters['login'],
                                           connection_parameters['password'],
                                           verify_cert=check_SSL,
                                           simulator=simulator,
                                           enforceSSL=enforceSSL)
            return(redfish_data)
        except redfish.exception.RedfishException as e:
            logger.error(str(e.message))
            sys.stderr.write(str(e.message))
            sys.stderr.write(str(e.advices))
            sys.exit(1)

    #################################################################
    # Main program
    #################################################################
    check_cartridge_version = "check_cartridge PBVER"

    # Parse and manage arguments
    try:
        usagefp = 'PBSHAREPATH' + "/redfish-check-cartridge_usage.txt"
        with open(usagefp) as usagefile:
            usage = usagefile.read()
            usagefile.close()
    except (ValueError, IOError):
        print("Usage file {} cannot be found.".format(usagefp))
        sys.exit(1)
    arguments = docopt.docopt(usage, version=check_cartridge_version)

    # Check debuging options
    # Debugging LEVEL :
    # 1- Only client
    # 2- Client and lib
    # 3- Client and lib + Tortilla

    loglevel = {"console_logger_level": "nolog",
                "file_logger_level": logging.INFO,
                "tortilla": False,
                "lib_console_logger_level": "nolog",
                "lib_file_logger_level": logging.INFO,
                "urllib3_disable_warning": True}

    if arguments['--debug'] == '1':
        loglevel['console_logger_level'] = logging.DEBUG
        loglevel['file_logger_level'] = logging.DEBUG
    elif arguments['--debug'] == '2':
        loglevel['console_logger_level'] = logging.DEBUG
        loglevel['file_logger_level'] = logging.DEBUG
        loglevel['lib_console_logger_level'] = logging.DEBUG
        loglevel['lib_file_logger_level'] = logging.DEBUG
        loglevel['urllib3_disable_warning'] = False
    elif arguments['--debug'] == '3':
        loglevel['console_logger_level'] = logging.DEBUG
        loglevel['file_logger_level'] = logging.DEBUG
        loglevel['lib_console_logger_level'] = logging.DEBUG
        loglevel['lib_file_logger_level'] = logging.DEBUG
        loglevel['urllib3_disable_warning'] = False
        loglevel['tortilla'] = True

    # Initialize logger according to command line parameters
    logger = redfish.config.initialize_logger(arguments['--debugfile'],
                                              loglevel['console_logger_level'],
                                              loglevel['file_logger_level'],
                                              __name__)
    redfish.config.REDFISH_LOGFILE = arguments['--libdebugfile']
    redfish.config.TORTILLADEBUG = loglevel['tortilla']
    redfish.config.CONSOLE_LOGGER_LEVEL = loglevel['lib_console_logger_level']
    redfish.config.FILE_LOGGER_LEVEL = loglevel['lib_file_logger_level']
    # Avoid warning messages from request / urllib3
    # SecurityWarning: Certificate has no `subjectAltName`, falling back
    # to check for a `commonName` for now. This feature is being removed
    # by major browsers and deprecated by RFC 2818.
    # (See https://github.com/shazow/urllib3/issues/497 for details.)
    if loglevel['urllib3_disable_warning'] is True:
        requests.packages.urllib3.disable_warnings()

    logger.info("*** Starting %s ***" % check_cartridge_version)
    logger.info("Arguments parsed")
    logger.debug(arguments)

    # Load config
    config = configparser.ConfigParser(allow_no_value=True)
    logger.debug("Read configuration file")
    configfile = 'PBCONFFILE'

    if(arguments['--config']):
        configfile = arguments['--config']
        logger.debug("Overwrite configuration specified by user at %s"
                     % configfile)

    if(os.path.isfile(configfile)):
        logger.debug('Configuration found at %s.' % configfile)
        config.read(configfile)
    else:
        print('Configuration file not found at {}.'.format(configfile))
        logger.error('Configuration file not found at %s.' % configfile)
        sys.exit(1)

    arguments['--inventory'] = os.path.expandvars(arguments['--inventory'])
    inventory = InventoryFile(arguments['--inventory'])

    # Check cmd line parameters
    # If manager is not defined set it to 'default'
    if not arguments['<manager_name>']:
        manager_name = 'default'
    else:
        manager_name = arguments['<manager_name>']
    # Check if the default section is available in our conf file
    inventory.check_manager(manager_name)
    connection_parameters = inventory.get_manager_info(manager_name)

    print('Gathering data from manager, please wait...\n')
    logger.info('Gathering data from manager')
    if arguments['--insecure'] is True:
        redfish_data = get_redfish_data(connection_parameters, False)
    else:
        redfish_data = get_redfish_data(connection_parameters, True)
    print('Get cartridge list\n')

    cartridge_file = os.path.join(os.path.dirname(arguments['--inventory']),
                                  'cartridge.json')

    current_cartridge = redfish_data.Systems.systems_dict.keys()
    previous_cartridge = []

    if os.path.isfile(cartridge_file):
        with open(cartridge_file, 'r') as f:
            previous_cartridge = json.load(f)
            f.close()

    print('Writing cartridge list to file')
    with open(cartridge_file, 'w') as f:
        if len(current_cartridge) > 0:
            json.dump(current_cartridge, f)
        else:
            f.write('{}')
    f.close()

    print("Current cartridges:")
    print("{}\n".format(", ".join(current_cartridge)))

    if not previous_cartridge:
        print("First run, changes can not be evaluated")
        sys.exit(0)

    current_cartridge = set(current_cartridge)
    previous_cartridge = set(previous_cartridge)

    print("Computing changes...\n")

    # Check if we have added a cartridge
    diff = current_cartridge - previous_cartridge
    print("Cartridges added:")
    if diff:
        print("{}".format(", ".join(diff)))
        for item in diff:
            system = redfish_data.Systems.systems_dict[item]
            print(system.get_name())
            print(system.get_model())
            print(system.get_uuid())
            print("Memory: {}".format(
                system.data.Memory.TotalSystemMemoryGB))
            print("MAC@: {}".format(
                system.data.HostCorrelation.HostMACAddress))
            print("------------------")
    else:
        print("None")

    # Check if we have removed a cartridge
    diff = previous_cartridge - current_cartridge
    print("Cartridges removed:")
    if diff:
        print("{}\n".format(", ".join(diff)))
    else:
        print("None")

    logger.info("Client session terminated")
    sys.exit(0)