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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 _arguments, parse_known_args, init_parser,\

    update_arguments

from kamaki.cli.history import History

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

from kamaki.cli.errors import CLIError

_help = False

_debug = False

_verbose = False

_colors = False

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>' % x\

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

            .replace('___', ':')\

            .replace('__', ']').\

            replace('_', ' ') for x in args[:n])

        optional = ' '.join('[%s]' % x\

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

            .replace('___', ':')\

            .replace('__', ']').\

            replace('_', ' ') 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 _get_cmd_tree_from_spec(spec, cmd_tree_list):

    for tree in cmd_tree_list:

        if tree.name == spec:

            return tree

    return None

_best_match = []

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

        spec_cmd0_cmd1 will be command spec cmd0

        @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

    """

    def wrap(cls):

        cls_name = cls.__name__

        if not cmd_tree:

            if _debug:

                print('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:

                print('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:

                print('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

def get_cmd_terms():

    global command

    return [term for term in command.func_defaults[0]\

        if not term.startswith('-')]

cmd_spec_locations = [

    'kamaki.cli.commands',

    'kamaki.commands',

    'kamaki.cli',

    'kamaki',

    '']

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

    """handle logging for clients package"""

    def add_handler(name, level, prefix=''):

        h = logging.StreamHandler()

        fmt = logging.Formatter(prefix + '%(message)s')

        h.setFormatter(fmt)

        logger = logging.getLogger(name)

        logger.addHandler(h)

        logger.setLevel(level)

    if silent:

        add_handler('', logging.CRITICAL)

    elif debug:

        add_handler('requests', logging.INFO, prefix='* ')

        add_handler('clients.send', logging.DEBUG, prefix='> ')

        add_handler('clients.recv', logging.DEBUG, prefix='< ')

    elif verbose:

        add_handler('requests', logging.INFO, prefix='* ')

        add_handler('clients.send', logging.INFO, prefix='> ')

        add_handler('clients.recv', logging.INFO, prefix='< ')

    elif include:

        add_handler('clients.recv', logging.INFO)

    else:

        add_handler('', logging.WARNING)

def _init_session(arguments):

    global _help

    _help = arguments['help'].value

    global _debug

    _debug = arguments['debug'].value

    global _verbose

    _verbose = arguments['verbose'].value

    global _colors

    _colors = arguments['config'].get('global', 'colors')

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

        from kamaki.cli.utils import remove_colors

        remove_colors()

    _silent = arguments['silent'].value

    _include = arguments['include'].value

    _setup_logging(_silent, _debug, _verbose, _include)

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 _load_spec_module(spec, arguments, module):

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

    if spec_name is None:

        return None

    pkg = None

    for location in cmd_spec_locations:

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

        try:

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

            return pkg

        except ImportError:

            continue

    return pkg

def _groups_help(arguments):

    global _debug

    descriptions = {}

    for spec in arguments['config'].get_groups():

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

        if pkg:

            cmds = None

            try:

                cmds = [

                    cmd for cmd in getattr(pkg, '_commands')\

                    if arguments['config'].get(cmd.name, 'cli')

                ]

            except AttributeError:

                if _debug:

                    print('Warning: No description for %s' % spec)

            try:

                for cmd in cmds:

                    descriptions[cmd.name] = cmd.description

            except TypeError:

                if _debug:

                    print('Warning: no cmd specs in module %s' % spec)

        elif _debug:

            print('Warning: Loading of %s cmd spec failed' % spec)

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

    print_dict(descriptions)

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

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

    if cmd.is_command:

        cls = cmd.get_class()

        parser.prog += ' ' + cls.syntax

        arguments = cls().arguments

        update_arguments(parser, arguments)

    else:

        parser.prog += ' <...>'

    if cmd.has_description:

        parser.description = cmd.help

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)

    print_list(cli_err.details)

def _get_best_match_from_cmd_tree(cmd_tree, unparsed):

    matched = [term for term in unparsed if not term.startswith('-')]

    while matched:

        try:

            return cmd_tree.get_command('_'.join(matched))

        except KeyError:

            matched = matched[:-1]

    return None

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 set_command_param(param, value):

    if param == 'prefix':

        pos = 0

    elif param == 'descedants_depth':

        pos = 1

    else:

        return

    global command

    def_params = list(command.func_defaults)

    def_params[pos] = value

    command.func_defaults = tuple(def_params)

def one_cmd(parser, unparsed, arguments):

    group = get_command_group(list(unparsed), arguments)

    if not group:

        parser.print_help()

        _groups_help(arguments)

        exit(0)

    set_command_param(

        'prefix',

        [term for term in unparsed if not term.startswith('-')]

    )

    global _best_match

    _best_match = []

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

    cmd_tree = _get_cmd_tree_from_spec(group, spec_module._commands)

    if _best_match:

        cmd = cmd_tree.get_command('_'.join(_best_match))

    else:

        cmd = _get_best_match_from_cmd_tree(cmd_tree, unparsed)

        _best_match = cmd.path.split('_')

    if cmd is None:

        if _debug or _verbose:

            print('Unexpected error: failed to load command')

        exit(1)

    _update_parser_help(parser, cmd)

    if _help or not cmd.is_command:

        parser.print_help()

        _print_subcommands_help(cmd)

        exit(0)

    cls = cmd.get_class()

    executable = cls(arguments)

    parsed, unparsed = parse_known_args(parser, executable.arguments)

    for term in _best_match:

        unparsed.remove(term)

    _exec_cmd(executable, unparsed, parser.print_help)

def _load_all_commands(cmd_tree, arguments):

    _config = arguments['config']

    for spec in [spec for spec in _config.get_groups()\

            if _config.get(spec, 'cli')]:

        try:

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

            spec_commands = getattr(spec_module, '_commands')

        except AttributeError:

            if _debug:

                print('Warning: No valid description for %s' % spec)

            continue

        for spec_tree in spec_commands:

            if spec_tree.name == spec:

                cmd_tree.add_tree(spec_tree)

                break

def run_shell(exe_string, arguments):

    from command_shell import _init_shell

    shell = _init_shell(exe_string, arguments)

    _load_all_commands(shell.cmd_tree, arguments)

    shell.run(arguments)

def main():

    try:

        exe = basename(argv[0])

        parser = init_parser(exe, _arguments)

        parsed, unparsed = parse_known_args(parser, _arguments)

        if _arguments['version'].value:

            exit(0)

        _init_session(_arguments)

        if unparsed:

            _history = History(_arguments['config'].get('history', 'file'))

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

            one_cmd(parser, unparsed, _arguments)

        elif _help:

            parser.print_help()

            _groups_help(_arguments)

        else:

            run_shell(exe, _arguments)

    except CLIError as err:

        if _debug:

            raise err

        _print_error_message(err)

        exit(1)

    except Exception as err:

        if _debug:

            raise err

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