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import logging

from sys import argv, exit, stdout, stderr

from os.path import basename, exists

from inspect import getargspec

from kamaki.cli.argument import ArgumentParseManager

from kamaki.cli.history import History

from kamaki.cli.utils import print_dict, red, magenta, yellow

from kamaki.cli.errors import CLIError, CLICmdSpecError

from kamaki.cli import logger

from kamaki.clients.astakos import AstakosClient as AuthCachedClient

from kamaki.clients import ClientError

_help = False

_debug = False

_verbose = False

_colors = False

kloger = None

filelog = None

#  command auxiliary methods

_best_match = []

def _arg2syntax(arg):

    return arg.replace(

        '____', '[:').replace(

            '___', ':').replace(

                '__', ']').replace(

                    '_', ' ')

def _construct_command_syntax(cls):

        spec = getargspec(cls.main.im_func)

        args = spec.args[1:]

        n = len(args) - len(spec.defaults or ())

        required = ' '.join(['<%s>' % _arg2syntax(x) for x in args[:n]])

        optional = ' '.join(['[%s]' % _arg2syntax(x) for x in args[n:]])

        cls.syntax = ' '.join(x for x in [required, optional] if x)

        if spec.varargs:

            cls.syntax += ' <%s ...>' % spec.varargs

def _num_of_matching_terms(basic_list, attack_list):

    if not attack_list:

        return len(basic_list)

    matching_terms = 0

    for i, term in enumerate(basic_list):

        try:

            if term != attack_list[i]:

                break

        except IndexError:

            break

        matching_terms += 1

    return matching_terms

def _update_best_match(name_terms, prefix=[]):

    if prefix:

        pref_list = prefix if isinstance(prefix, list) else prefix.split('_')

    else:

        pref_list = []

    num_of_matching_terms = _num_of_matching_terms(name_terms, pref_list)

    global _best_match

    if not prefix:

        _best_match = []

    if num_of_matching_terms and len(_best_match) <= num_of_matching_terms:

        if len(_best_match) < num_of_matching_terms:

            _best_match = name_terms[:num_of_matching_terms]

        return True

    return False

def command(cmd_tree, prefix='', descedants_depth=1):

    """Load a class as a command

        e.g., spec_cmd0_cmd1 will be command spec cmd0

        :param cmd_tree: is initialized in cmd_spec file and is the structure

            where commands are loaded. Var name should be _commands

        :param prefix: if given, load only commands prefixed with prefix,

        :param descedants_depth: is the depth of the tree descedants of the

            prefix command. It is used ONLY if prefix and if prefix is not

            a terminal command

        :returns: the specified class object

    """

    def wrap(cls):

        global kloger

        cls_name = cls.__name__

        if not cmd_tree:

            if _debug:

                kloger.warning('command %s found but not loaded' % cls_name)

            return cls

        name_terms = cls_name.split('_')

        if not _update_best_match(name_terms, prefix):

            if _debug:

                kloger.warning('%s failed to update_best_match' % cls_name)

            return None

        global _best_match

        max_len = len(_best_match) + descedants_depth

        if len(name_terms) > max_len:

            partial = '_'.join(name_terms[:max_len])

            if not cmd_tree.has_command(partial):  # add partial path

                cmd_tree.add_command(partial)

            if _debug:

                kloger.warning('%s failed max_len test' % cls_name)

            return None

        try:

            (

                cls.description, sep, cls.long_description

            ) = cls.__doc__.partition('\n')

        except AttributeError:

            raise CLICmdSpecError(

                'No commend in %s (acts as cmd description)' % cls.__name__)

        _construct_command_syntax(cls)

        cmd_tree.add_command(

            cls_name, cls.description, cls, cls.long_description)

        return cls

    return wrap

cmd_spec_locations = [

    'kamaki.cli.commands',

    'kamaki.commands',

    'kamaki.cli',

    'kamaki',

    '']

#  Generic init auxiliary functions

def _setup_logging(silent=False, debug=False, verbose=False):

    """handle logging for clients package"""

    if silent:

        logger.add_stream_logger(__name__, logging.CRITICAL)

        return

    sfmt, rfmt = '> %(message)s', '< %(message)s'

    if debug:

        print('Logging location: %s' % logger.get_log_filename())

        logger.add_stream_logger('kamaki.clients.send', logging.DEBUG, sfmt)

        logger.add_stream_logger('kamaki.clients.recv', logging.DEBUG, rfmt)

        logger.add_stream_logger(__name__, logging.DEBUG)

    elif verbose:

        logger.add_stream_logger('kamaki.clients.send', logging.INFO, sfmt)

        logger.add_stream_logger('kamaki.clients.recv', logging.INFO, rfmt)

        logger.add_stream_logger(__name__, logging.INFO)

    logger.add_stream_logger(__name__, logging.WARNING)

    global kloger

    kloger = logger.get_logger(__name__)

def _check_config_version(cnf):

    guess = cnf.guess_version()

    if exists(cnf.path) and guess < 0.9:

        print('Config file format version >= 9.0 is required')

        print('Configuration file: %s' % cnf.path)

        print('Attempting to fix this:')

        print('Calculating changes while preserving information')

        lost_terms = cnf.rescue_old_file()

        print('... DONE')

        if lost_terms:

            print 'The following information will NOT be preserved:'

            print '\t', '\n\t'.join(lost_terms)

        print('Kamaki is ready to convert the config file')

        stdout.write('Create (overwrite) file %s ? [y/N] ' % cnf.path)

        from sys import stdin

        reply = stdin.readline()

        if reply in ('Y\n', 'y\n'):

            cnf.write()

            print('... DONE')

        else:

            print('... ABORTING')

            raise CLIError(

                'Invalid format for config file %s' % cnf.path,

                importance=3, details=[

                    'Please, update config file',

                    'For automatic conversion, rerun and say Y'])

def _init_session(arguments, is_non_API=False):

    """

    :returns: cloud name

    """

    global _help

    _help = arguments['help'].value

    global _debug

    _debug = arguments['debug'].value

    global _verbose

    _verbose = arguments['verbose'].value

    _cnf = arguments['config']

    _silent = arguments['silent'].value

    _setup_logging(_silent, _debug, _verbose)

    if _help or is_non_API:

        return None

    _check_config_version(_cnf.value)

    global _colors

    _colors = _cnf.value.get('global', 'colors')

    if not (stdout.isatty() and _colors == 'on'):

        from kamaki.cli.utils import remove_colors

        remove_colors()

    cloud = arguments['cloud'].value or _cnf.value.get(

        'global', 'default_cloud')

    if not cloud:

        num_of_clouds = len(_cnf.value.keys('cloud'))

        if num_of_clouds == 1:

            cloud = _cnf.value.keys('cloud')[0]

        elif num_of_clouds > 1:

            raise CLIError(

                'Found %s clouds but none of them is set as default' % (

                    num_of_clouds),

                importance=2, details=[

                    'Please, choose one of the following cloud names:',

                    ', '.join(_cnf.value.keys('cloud')),

                    'To see all cloud settings:',

                    '  kamaki config get cloud.<cloud name>',

                    'To set a default cloud:',

                    '  kamaki config set default_cloud <cloud name>',

                    'To pick a cloud for the current session, use --cloud:',

                    '  kamaki --cloud=<cloud name> ...'])

    if not cloud in _cnf.value.keys('cloud'):

        raise CLIError(

            'No cloud%s is configured' % ((' "%s"' % cloud) if cloud else ''),

            importance=3, details=[

                'To configure a new cloud "%s", find and set the' % (

                    cloud or '<cloud name>'),

                'single authentication URL and token:',

                '  kamaki config set cloud.%s.url <URL>' % (

                    cloud or '<cloud name>'),

                '  kamaki config set cloud.%s.token <t0k3n>' % (

                    cloud or '<cloud name>')])

    auth_args = dict()

    for term in ('url', 'token'):

        try:

            auth_args[term] = _cnf.get_cloud(cloud, term)

        except KeyError or IndexError:

            auth_args[term] = ''

        if not auth_args[term]:

            raise CLIError(

                'No authentication %s provided for cloud "%s"' % (

                    term.upper(), cloud),

                importance=3, details=[

                    'Set a %s for cloud %s:' % (term.upper(), cloud),

                    '  kamaki config set cloud.%s.%s <%s>' % (

                        cloud, term, term.upper())])

    return cloud

def init_cached_authenticator(config_argument, cloud, logger):

    try:

        _cnf = config_argument.value

        url = _cnf.get_cloud(cloud, 'url')

        tokens = _cnf.get_cloud(cloud, 'token').split()

        auth_base, failed = None, []

        for token in tokens:

            try:

                if auth_base:

                    auth_base.authenticate(token)

                else:

                    tmp_base = AuthCachedClient(url, token)

                    from kamaki.cli.commands import _command_init

                    fake_cmd = _command_init(dict(config=config_argument))

                    fake_cmd.client = auth_base

                    fake_cmd._set_log_params()

                    tmp_base.authenticate(token)

                    auth_base = tmp_base

            except ClientError as ce:

                if ce.status in (401, ):

                    logger.warning(

                        'WARNING: Failed to authenticate token %s' % token)

                    failed.append(token)

                else:

                    raise

        for token in failed:

            r = raw_input(

                'Token %s failed to authenticate. Remove it? [y/N]: ' % token)

            if r in ('y', 'Y'):

                tokens.remove(token)

        if set(failed).difference(tokens):

            _cnf.set_cloud(cloud, 'token', ' '.join(tokens))

            _cnf.write()

        if tokens:

            return auth_base

        logger.warning('WARNING: cloud.%s.token is now empty' % cloud)

    except AssertionError as ae:

        logger.warning('WARNING: Failed to load authenticator [%s]' % ae)

    return None

def _load_spec_module(spec, arguments, module):

    global kloger

    if not spec:

        return None

    pkg = None

    for location in cmd_spec_locations:

        location += spec if location == '' else '.%s' % spec

        try:

            kloger.debug('Import %s from %s' % ([module], location))

            pkg = __import__(location, fromlist=[module])

            kloger.debug('\t...OK')

            return pkg

        except ImportError as ie:

            kloger.debug('\t...Failed')

            continue

    if not pkg:

        msg = 'Loading command group %s failed: %s' % (spec, ie)

        msg += '\nHINT: use a text editor to remove all global.*_cli'

        msg += '\n\tsettings from the configuration file'

        kloger.debug(msg)

    return pkg

def _groups_help(arguments):

    global _debug

    global kloger

    descriptions = {}

    acceptable_groups = arguments['config'].groups

    for cmd_group, spec in arguments['config'].cli_specs:

        pkg = _load_spec_module(spec, arguments, '_commands')

        if pkg:

            cmds = getattr(pkg, '_commands')

            try:

                for cmd_tree in cmds:

                    if cmd_tree.name in acceptable_groups:

                        descriptions[cmd_tree.name] = cmd_tree.description

            except TypeError:

                if _debug:

                    kloger.warning(

                        'No cmd description (help) for module %s' % cmd_group)

        elif _debug:

            kloger.warning('Loading of %s cmd spec failed' % cmd_group)

    print('\nOptions:\n - - - -')

    print_dict(descriptions)

def _load_all_commands(cmd_tree, arguments):

    _cnf = arguments['config']

    for cmd_group, spec in _cnf.cli_specs:

        try:

            spec_module = _load_spec_module(spec, arguments, '_commands')

            spec_commands = getattr(spec_module, '_commands')

        except AttributeError:

            if _debug:

                global kloger

                kloger.warning('No valid description for %s' % cmd_group)

            continue

        for spec_tree in spec_commands:

            if spec_tree.name == cmd_group:

                cmd_tree.add_tree(spec_tree)

                break

#  Methods to be used by CLI implementations

def print_subcommands_help(cmd):

    printout = {}

    for subcmd in cmd.subcommands.values():

        spec, sep, print_path = subcmd.path.partition('_')

        printout[print_path.replace('_', ' ')] = subcmd.help

    if printout:

        print('\nOptions:\n - - - -')

        print_dict(printout)

def update_parser_help(parser, cmd):

    global _best_match

    parser.syntax = parser.syntax.split('<')[0]

    parser.syntax += ' '.join(_best_match)

    description = ''

    if cmd.is_command:

        cls = cmd.cmd_class

        parser.syntax += ' ' + cls.syntax

        parser.update_arguments(cls().arguments)

        description = getattr(cls, 'long_description', '').strip()

    else:

        parser.syntax += ' <...>'

    parser.parser.description = (

        cmd.help + ('\n' if description else '')) if cmd.help else description

def print_error_message(cli_err, out=stderr):

    errmsg = '%s' % cli_err

    if cli_err.importance == 1:

        errmsg = magenta(errmsg)

    elif cli_err.importance == 2:

        errmsg = yellow(errmsg)

    elif cli_err.importance > 2:

        errmsg = red(errmsg)

    out.write(errmsg)

    for errmsg in cli_err.details:

        out.write('|  %s\n' % errmsg)

        out.flush()

def exec_cmd(instance, cmd_args, help_method):

    try:

        return instance.main(*cmd_args)

    except TypeError as err:

        if err.args and err.args[0].startswith('main()'):

            print(magenta('Syntax error'))

            if _debug:

                raise err

            if _verbose:

                print(unicode(err))

            help_method()

        else:

            raise

    return 1

def get_command_group(unparsed, arguments):

    groups = arguments['config'].groups

    for term in unparsed:

        if term.startswith('-'):

            continue

        if term in groups:

            unparsed.remove(term)

            return term

        return None

    return None

def set_command_params(parameters):

    """Add a parameters list to a command

    :param paramters: (list of str) a list of parameters

    """

    global command

    def_params = list(command.func_defaults)

    def_params[0] = parameters

    command.func_defaults = tuple(def_params)

#  CLI Choice:

def run_one_cmd(exe_string, parser, cloud):

    global _history

    try:

        token = parser.arguments['config'].get_cloud(cloud, 'token').split()[0]

    except Exception:

        token = None

    _history = History(

        parser.arguments['config'].get('global', 'history_file'), token=token)

    _history.add(' '.join([exe_string] + argv[1:]))

    from kamaki.cli import one_command

    one_command.run(cloud, parser, _help)

def run_shell(exe_string, parser, cloud):

    from command_shell import _init_shell

    global kloger

    _cnf = parser.arguments['config']

    auth_base = init_cached_authenticator(_cnf, cloud, kloger)

    try:

        username, userid = (

            auth_base.user_term('name'), auth_base.user_term('id'))

    except Exception:

        username, userid = '', ''

    shell = _init_shell(exe_string, parser, username, userid)

    _load_all_commands(shell.cmd_tree, parser.arguments)

    shell.run(auth_base, cloud, parser)

def is_non_API(parser):

    nonAPIs = ('history', 'config')

    for term in parser.unparsed:

        if not term.startswith('-'):

            if term in nonAPIs:

                return True

            return False

    return False

def main():

    try:

        exe = basename(argv[0])

        parser = ArgumentParseManager(exe)

        if parser.arguments['version'].value:

            exit(0)

        _cnf = parser.arguments['config']

        log_file = _cnf.get('global', 'log_file')

        if log_file:

            logger.set_log_filename(log_file)

        global filelog

        filelog = logger.add_file_logger(__name__.split('.')[0])

        filelog.info('* Initial Call *\n%s\n- - -' % ' '.join(argv))

        cloud = _init_session(parser.arguments, is_non_API(parser))

        from kamaki.cli.utils import suggest_missing

        global _colors

        exclude = ['ansicolors'] if not _colors == 'on' else []

        suggest_missing(exclude=exclude)

        if parser.unparsed:

            run_one_cmd(exe, parser, cloud)

        elif _help:

            parser.parser.print_help()

            _groups_help(parser.arguments)

        else:

            run_shell(exe, parser, cloud)

    except CLIError as err:

        print_error_message(err)

        if _debug:

            raise err

        exit(1)

    except KeyboardInterrupt:

        print('Canceled by user')

        exit(1)

    except Exception as er:

        print('Unknown Error: %s' % er)

        if _debug:

            raise

        exit(1)