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import logging

from sys import argv, exit, stdout

from os.path import basename

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

from kamaki.cli import logger

_help = False

_debug = False

_include = 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

        (

            cls.description, sep, cls.long_description

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

        _construct_command_syntax(cls)

        cmd_tree.add_command(cls_name, cls.description, cls)

        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, include=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)

    if include:

        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.WARNING)

    global kloger

    kloger = logger.get_logger(__name__)

def _init_session(arguments):

    global _help

    _help = arguments['help'].value

    global _debug

    _debug = arguments['debug'].value

    global _include

    _include = arguments['include'].value

    global _verbose

    _verbose = arguments['verbose'].value

    _cnf = arguments['config']

    guess = _cnf.value.guess_version()

    if guess < 3.0:

        print('PLEASE DO NOT PANIC: EXIT THE BUILDING QUIETLY')

    raise CLIError('STOP HERE, PLEASE %s' % guess)

    global _colors

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

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

        from kamaki.cli.utils import remove_colors

        remove_colors()

    _silent = arguments['silent'].value

    _setup_logging(_silent, _debug, _verbose, _include)

    picked_cloud = arguments['cloud'].value

    if picked_cloud:

        global_url = _cnf.get('remotes', picked_cloud)

        if not global_url:

            raise CLIError(

                'No remote cloud "%s" in kamaki configuration' % picked_cloud,

                importance=3, details=[

                    'To check if this remote cloud alias is declared:',

                    '  /config get remotes.%s' % picked_cloud,

                    'To set a remote authentication URI aliased as "%s"' % (

                        picked_cloud),

                    '  /config set remotes.%s <URI>' % picked_cloud

                ])

    else:

        global_url = _cnf.get('global', 'auth_url')

    global_token = _cnf.get('global', 'token')

    from kamaki.clients.astakos import AstakosClient as AuthCachedClient

    try:

        return AuthCachedClient(global_url, global_token)

    except AssertionError as ae:

        kloger.warning('WARNING: Failed to load auth_url %s [ %s ]' % (

            global_url, ae))

        return None

def _load_spec_module(spec, arguments, module):

    #spec_name = arguments['config'].get('cli', spec)

    if not spec:

        return None

    pkg = None

    for location in cmd_spec_locations:

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

        try:

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

            return pkg

        except ImportError as ie:

            continue

    if not pkg:

        kloger.debug('Loading cmd grp %s failed: %s' % (spec, ie))

    return pkg

def _groups_help(arguments):

    global _debug

    global kloger

    descriptions = {}

    for cmd_group, spec in arguments['config'].get_cli_specs():

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

        if pkg:

            cmds = getattr(pkg, '_commands')

            try:

                for cmd in cmds:

                    descriptions[cmd.name] = cmd.description

            except TypeError:

                if _debug:

                    kloger.warning(

                        'No cmd description 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']

    #specs = [spec for spec in _cnf.get_groups() if _cnf.get(spec, 'cli')]

    for cmd_group, spec in _cnf.get_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.get_subcommands():

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

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

    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.get_class()

        parser.syntax += ' ' + cls.syntax

        parser.update_arguments(cls().arguments)

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

        description = description.strip()

    else:

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

    if cmd.has_description:

        parser.parser.description = cmd.help + (

            ('\n%s' % description) if description else '')

    else:

        parser.parser.description = description

def print_error_message(cli_err):

    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)

    stdout.write(errmsg)

    for errmsg in cli_err.details:

        print('|  %s' % errmsg)

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'].get_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, auth_base):

    global _history

    _history = History(

        parser.arguments['config'].get('history', 'file'))

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

    from kamaki.cli import one_command

    one_command.run(auth_base, parser, _help)

def run_shell(exe_string, parser, auth_base):

    from command_shell import _init_shell

    shell = _init_shell(exe_string, parser)

    _load_all_commands(shell.cmd_tree, parser.arguments)

    shell.run(auth_base, parser)

def main():

    try:

        exe = basename(argv[0])

        parser = ArgumentParseManager(exe)

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

            exit(0)

        log_file = parser.arguments['config'].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))

        auth_base = _init_session(parser.arguments)

        from kamaki.cli.utils import suggest_missing

        suggest_missing()

        if parser.unparsed:

            run_one_cmd(exe, parser, auth_base)

        elif _help:

            parser.parser.print_help()

            _groups_help(parser.arguments)

        else:

            run_shell(exe, parser, auth_base)

    except CLIError as err:

        print_error_message(err)

        if _debug:

            raise err

        exit(1)

    except Exception as er:

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

        if _debug:

            raise

        exit(1)