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from kamaki.cli.config import Config

from kamaki.cli.errors import CLISyntaxError, raiseCLIError

from kamaki.cli.utils import split_input, to_bytes

from datetime import datetime as dtm

from time import mktime

from sys import stderr

from logging import getLogger

from argparse import ArgumentParser, ArgumentError

from argparse import RawDescriptionHelpFormatter

from progress.bar import ShadyBar as KamakiProgressBar

log = getLogger(__name__)

class Argument(object):

    """An argument that can be parsed from command line or otherwise.

    This is the top-level Argument class. It is suggested to extent this

    class into more specific argument types.

    """

    lvalue_delimiter = '/'

    def __init__(self, arity, help=None, parsed_name=None, default=None):

        self.arity = int(arity)

        self.help = '%s' % help or ''

        assert parsed_name, 'No parsed name for argument %s' % self

        self.parsed_name = list(parsed_name) if isinstance(

            parsed_name, list) or isinstance(parsed_name, tuple) else (

                '%s' % parsed_name).split()

        for name in self.parsed_name:

            assert name.count(' ') == 0, '%s: Invalid parse name "%s"' % (

                self, name)

            msg = '%s: Invalid parse name "%s" should start with a "-"' % (

                    self, name)

            assert name.startswith('-'), msg

        self.default = default or None

    @property

    def value(self):

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

    def update_parser(self, parser, name):

        """Update argument parser with self info"""

        action = 'append' if self.arity < 0 else (

            'store' if self.arity else 'store_true')

        parser.add_argument(

            *self.parsed_name,

            dest=name, action=action, default=self.default, help=self.help)

    @property

    def lvalue(self):

        """A printable form of the left value when calling an argument e.g.,

        --left-value=right-value"""

        return (self.lvalue_delimiter or ' ').join(self.parsed_name or [])

class ConfigArgument(Argument):

    """Manage a kamaki configuration (file)"""

    def __init__(self, help, parsed_name=('-c', '--config')):

        super(ConfigArgument, self).__init__(1, help, parsed_name, None)

        self.file_path = None

    @property

    def value(self):

        return getattr(self, '_value', None)

    @value.setter

    def value(self, config_file):

        if config_file:

            self._value = Config(config_file)

            self.file_path = config_file

        elif self.file_path:

            self._value = Config(self.file_path)

        else:

            self._value = Config()

    def get(self, group, term):

        """Get a configuration setting from the Config object"""

        return self.value.get(group, term)

    @property

    def groups(self):

        suffix = '_cli'

        slen = len(suffix)

        return [term[:-slen] for term in self.value.keys('global') if (

            term.endswith(suffix))]

    @property

    def cli_specs(self):

        suffix = '_cli'

        slen = len(suffix)

        return [(k[:-slen], v) for k, v in self.value.items('global') if (

            k.endswith(suffix))]

    def get_global(self, option):

        return self.value.get('global', option)

    def get_cloud(self, cloud, option):

        return self.value.get_cloud(cloud, option)

_config_arg = ConfigArgument('Path to config file')

class RuntimeConfigArgument(Argument):

    """Set a run-time setting option (not persistent)"""

    def __init__(self, config_arg, help='', parsed_name=None, default=None):

        super(self.__class__, self).__init__(1, help, parsed_name, default)

        self._config_arg = config_arg

    @property

    def value(self):

        return super(RuntimeConfigArgument, self).value

    @value.setter

    def value(self, options):

        if options == self.default:

            return

        if not isinstance(options, list):

            options = ['%s' % options]

        for option in options:

            keypath, sep, val = option.partition('=')

            if not sep:

                raiseCLIError(

                    CLISyntaxError('Argument Syntax Error '),

                    details=[

                        '%s is missing a "="',

                        ' (usage: -o section.key=val)' % option])

            section, sep, key = keypath.partition('.')

        if not sep:

            key = section

            section = 'global'

        self._config_arg.value.override(

            section.strip(),

            key.strip(),

            val.strip())

class FlagArgument(Argument):

    """

    :value: true if set, false otherwise

    """

    def __init__(self, help='', parsed_name=None, default=None):

        super(FlagArgument, self).__init__(0, help, parsed_name, default)

class ValueArgument(Argument):

    """

    :value type: string

    :value returns: given value or default

    """

    def __init__(self, help='', parsed_name=None, default=None):

        super(ValueArgument, self).__init__(1, help, parsed_name, default)

class CommaSeparatedListArgument(ValueArgument):

    """

    :value type: string

    :value returns: list of the comma separated values

    """

    @property

    def value(self):

        return self._value or list()

    @value.setter

    def value(self, newvalue):

        self._value = newvalue.split(',') if newvalue else list()

class IntArgument(ValueArgument):

    @property

    def value(self):

        """integer (type checking)"""

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        if newvalue == self.default:

            self._value = newvalue

            return

        try:

            if int(newvalue) == float(newvalue):

                self._value = int(newvalue)

            else:

                raise ValueError('Raise int argument error')

        except ValueError:

            raiseCLIError(CLISyntaxError(

                'IntArgument Error',

                details=['Value %s not an int' % newvalue]))

class DataSizeArgument(ValueArgument):

    """Input: a string of the form <number><unit>

    Output: the number of bytes

    Units: B, KiB, KB, MiB, MB, GiB, GB, TiB, TB

    """

    @property

    def value(self):

        return getattr(self, '_value', self.default)

    def _calculate_limit(self, user_input):

        limit = 0

        try:

            limit = int(user_input)

        except ValueError:

            index = 0

            digits = [str(num) for num in range(0, 10)] + ['.']

            while user_input[index] in digits:

                index += 1

            limit = user_input[:index]

            format = user_input[index:]

            try:

                return to_bytes(limit, format)

            except Exception as qe:

                msg = 'Failed to convert %s to bytes' % user_input,

                raiseCLIError(qe, msg, details=[

                    'Syntax: containerlimit set <limit>[format] [container]',

                    'e.g.,: containerlimit set 2.3GB mycontainer',

                    'Valid formats:',

                    '(*1024): B, KiB, MiB, GiB, TiB',

                    '(*1000): B, KB, MB, GB, TB'])

        return limit

    @value.setter

    def value(self, new_value):

        if new_value:

            self._value = self._calculate_limit(new_value)

class DateArgument(ValueArgument):

    DATE_FORMAT = '%a %b %d %H:%M:%S %Y'

    INPUT_FORMATS = [DATE_FORMAT, '%d-%m-%Y', '%H:%M:%S %d-%m-%Y']

    @property

    def timestamp(self):

        v = getattr(self, '_value', self.default)

        return mktime(v.timetuple()) if v else None

    @property

    def formated(self):

        v = getattr(self, '_value', self.default)

        return v.strftime(self.DATE_FORMAT) if v else None

    @property

    def value(self):

        return self.timestamp

    @value.setter

    def value(self, newvalue):

        self._value = self.format_date(newvalue) if newvalue else self.default

    def format_date(self, datestr):

        for format in self.INPUT_FORMATS:

            try:

                t = dtm.strptime(datestr, format)

            except ValueError:

                continue

            return t  # .strftime(self.DATE_FORMAT)

        raiseCLIError(None, 'Date Argument Error', details=[

            '%s not a valid date' % datestr,

            'Correct formats:\n\t%s' % self.INPUT_FORMATS])

class VersionArgument(FlagArgument):

    """A flag argument with that prints current version"""

    @property

    def value(self):

        """bool"""

        return super(self.__class__, self).value

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

        if newvalue:

            import kamaki

            print('kamaki %s' % kamaki.__version__)

class RepeatableArgument(Argument):

    """A value argument that can be repeated"""

    def __init__(self, help='', parsed_name=None, default=None):

        super(RepeatableArgument, self).__init__(

            -1, help, parsed_name, default)

    @property

    def value(self):

        return getattr(self, '_value', [])

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

class KeyValueArgument(Argument):

    """A Key=Value Argument that can be repeated

    :syntax: --<arg> key1=value1 --<arg> key2=value2 ...

    """

    def __init__(self, help='', parsed_name=None, default=None):

        super(KeyValueArgument, self).__init__(-1, help, parsed_name, default)

    @property

    def value(self):

        """

        :returns: (dict) {key1: val1, key2: val2, ...}

        """

        return getattr(self, '_value', {})

    @value.setter

    def value(self, keyvalue_pairs):

        """

        :param keyvalue_pairs: (str) ['key1=val1', 'key2=val2', ...]

        """

        if keyvalue_pairs:

            self._value = self.value

            try:

                for pair in keyvalue_pairs:

                    key, sep, val = pair.partition('=')

                    assert sep, ' %s misses a "=" (usage: key1=val1 )\n' % (

                        pair)

                    self._value[key] = val

            except Exception as e:

                raiseCLIError(e, 'KeyValueArgument Syntax Error')

class ProgressBarArgument(FlagArgument):

    """Manage a progress bar"""

    def __init__(self, help='', parsed_name='', default=True):

        self.suffix = '%(percent)d%%'

        super(ProgressBarArgument, self).__init__(help, parsed_name, default)

    def clone(self):

        """Get a modifiable copy of this bar"""

        newarg = ProgressBarArgument(

            self.help, self.parsed_name, self.default)

        newarg._value = self._value

        return newarg

    def get_generator(

            self, message, message_len=25, countdown=False, timeout=100):

        """Get a generator to handle progress of the bar (gen.next())"""

        if self.value:

            return None

        try:

            self.bar = KamakiProgressBar()

        except NameError:

            self.value = None

            return self.value

        if countdown:

            bar_phases = list(self.bar.phases)

            self.bar.empty_fill, bar_phases[0] = bar_phases[-1], ''

            bar_phases.reverse()

            self.bar.phases = bar_phases

            self.bar.bar_prefix = ' '

            self.bar.bar_suffix = ' '

            self.bar.max = timeout or 100

            self.bar.suffix = '%(remaining)ds to timeout'

        else:

            self.bar.suffix = '%(percent)d%% - %(eta)ds'

        self.bar.eta = timeout or 100

        self.bar.message = message.ljust(message_len)

        self.bar.start()

        def progress_gen(n):

            for i in self.bar.iter(range(int(n))):

                yield

            yield

        return progress_gen

    def finish(self):

        """Stop progress bar, return terminal cursor to user"""

        if self.value:

            return

        mybar = getattr(self, 'bar', None)

        if mybar:

            mybar.finish()

_arguments = dict(

    config=_config_arg,

    cloud=ValueArgument('Chose a cloud to connect to', ('--cloud')),

    help=Argument(0, 'Show help message', ('-h', '--help')),

    debug=FlagArgument('Include debug output', ('-d', '--debug')),

    #include=FlagArgument(

    #    'Include raw connection data in the output', ('-i', '--include')),

    silent=FlagArgument('Do not output anything', ('-s', '--silent')),

    verbose=FlagArgument('More info at response', ('-v', '--verbose')),

    version=VersionArgument('Print current version', ('-V', '--version')),

    options=RuntimeConfigArgument(

        _config_arg, 'Override a config value', ('-o', '--options'))

)

#  Initial command line interface arguments

class ArgumentParseManager(object):

    """Manage (initialize and update) an ArgumentParser object"""

    def __init__(

            self, exe,

            arguments=None, required=None, syntax=None, description=None,

            check_required=True):

        """

        :param exe: (str) the basic command (e.g. 'kamaki')

        :param arguments: (dict) if given, overrides the global _argument as

            the parsers arguments specification

        :param required: (list or tuple) an iterable of argument keys, denoting

            which arguments are required. A tuple denoted an AND relation,

            while a list denotes an OR relation e.g., ['a', 'b'] means that

            either 'a' or 'b' is required, while ('a', 'b') means that both 'a'

            and 'b' ar required.

            Nesting is allowed e.g., ['a', ('b', 'c'), ['d', 'e']] means that

            this command required either 'a', or both 'b' and 'c', or one of

            'd', 'e'.

            Repeated arguments are also allowed e.g., [('a', 'b'), ('a', 'c'),

            ['b', 'c']] means that the command required either 'a' and 'b' or

            'a' and 'c' or at least one of 'b', 'c' and could be written as

            [('a', ['b', 'c']), ['b', 'c']]

        :param syntax: (str) The basic syntax of the arguments. Default:

            exe <cmd_group> [<cmd_subbroup> ...] <cmd>

        :param description: (str) The description of the commands or ''

        :param check_required: (bool) Set to False inorder not to check for

            required argument values while parsing

        """

        self.parser = ArgumentParser(

            add_help=False, formatter_class=RawDescriptionHelpFormatter)

        self._exe = exe

        self.syntax = syntax or (

            '%s <cmd_group> [<cmd_subbroup> ...] <cmd>' % exe)

        self.required, self.check_required = required, check_required

        self.parser.description = description or ''

        if arguments:

            self.arguments = arguments

        else:

            global _arguments

            self.arguments = _arguments

        self._parser_modified, self._parsed, self._unparsed = False, None, None

        self.parse()

    @staticmethod

    def required2list(required):

        if isinstance(required, list) or isinstance(required, tuple):

            terms = []

            for r in required:

                terms.append(ArgumentParseManager.required2list(r))

            return list(set(terms).union())

        return required

    @staticmethod

    def required2str(required, arguments, tab=''):

        if isinstance(required, list):

            return ' %sat least one of the following:\n%s' % (tab, ''.join(

                [ArgumentParseManager.required2str(

                    r, arguments, tab + '  ') for r in required]))

        elif isinstance(required, tuple):

            return ' %sall of the following:\n%s' % (tab, ''.join(

                [ArgumentParseManager.required2str(

                    r, arguments, tab + '  ') for r in required]))

        else:

            lt_pn, lt_all, arg = 23, 80, arguments[required]

            tab2 = ' ' * lt_pn

            ret = '%s%s' % (tab, ', '.join(arg.parsed_name))

            if arg.arity != 0:

                ret += ' %s' % required.upper()

            ret = ('{:<%s}' % lt_pn).format(ret)

            prefix = ('\n%s' % tab2) if len(ret) > lt_pn else ' '

            cur = 0

            while arg.help[cur:]:

                next = cur + lt_all - lt_pn

                ret += prefix

                ret += ('{:<%s}' % (lt_all - lt_pn)).format(arg.help[cur:next])

                cur, finish = next, '\n%s' % tab2

            return ret + '\n'

    @staticmethod

    def _patch_with_required_args(arguments, required):

        if isinstance(required, tuple):

            return ' '.join([ArgumentParseManager._patch_with_required_args(

                arguments, k) for k in required])

        elif isinstance(required, list):

            return '< %s >' % ' | '.join([

                ArgumentParseManager._patch_with_required_args(

                    arguments, k) for k in required])

        arg = arguments[required]

        return '/'.join(arg.parsed_name) + (

            ' %s [...]' % required.upper() if arg.arity < 0 else (

                ' %s' % required.upper() if arg.arity else ''))

    def print_help(self, out=stderr):

        if self.required:

            tmp_args = dict(self.arguments)

            for term in self.required2list(self.required):

                tmp_args.pop(term)

            tmp_parser = ArgumentParseManager(self._exe, tmp_args)

            tmp_parser.syntax = self.syntax + self._patch_with_required_args(

                self.arguments, self.required)

            tmp_parser.parser.description = '%s\n\nrequired arguments:\n%s' % (

                self.parser.description,

                self.required2str(self.required, self.arguments))

            tmp_parser.update_parser()

            tmp_parser.parser.print_help()

        else:

            self.parser.print_help()

    @property

    def syntax(self):

        """The command syntax (useful for help messages, descriptions, etc)"""

        return self.parser.prog

    @syntax.setter

    def syntax(self, new_syntax):

        self.parser.prog = new_syntax

    @property

    def arguments(self):

        """:returns: (dict) arguments the parser should be aware of"""

        return self._arguments

    @arguments.setter

    def arguments(self, new_arguments):

        assert isinstance(new_arguments, dict), 'Arguments must be in a dict'

        self._arguments = new_arguments

        self.update_parser()

    @property

    def parsed(self):

        """(Namespace) parser-matched terms"""

        if self._parser_modified:

            self.parse()

        return self._parsed

    @property

    def unparsed(self):

        """(list) parser-unmatched terms"""

        if self._parser_modified:

            self.parse()

        return self._unparsed

    def update_parser(self, arguments=None):

        """Load argument specifications to parser

        :param arguments: if not given, update self.arguments instead

        """

        arguments = arguments or self._arguments

        for name, arg in arguments.items():

            try:

                arg.update_parser(self.parser, name)

                self._parser_modified = True

            except ArgumentError:

                pass

    def update_arguments(self, new_arguments):

        """Add to / update existing arguments

        :param new_arguments: (dict)

        """

        if new_arguments:

            assert isinstance(new_arguments, dict), 'Arguments not in dict !!!'

            self._arguments.update(new_arguments)

            self.update_parser()

    def _parse_required_arguments(self, required, parsed_args):

        if not (self.check_required and required):

            return True

        if isinstance(required, tuple):

            for item in required:

                if not self._parse_required_arguments(item, parsed_args):

                    return False

            return True

        if isinstance(required, list):

            for item in required:

                if self._parse_required_arguments(item, parsed_args):

                    return True

            return False

        return required in parsed_args

    def parse(self, new_args=None):

        """Parse user input"""

        try:

            pkargs = (new_args,) if new_args else ()

            self._parsed, unparsed = self.parser.parse_known_args(*pkargs)

            parsed_args = [

                k for k, v in vars(self._parsed).items() if v not in (None, )]

            if not self._parse_required_arguments(self.required, parsed_args):

                self.print_help()

                raise CLISyntaxError('Missing required arguments')

        except SystemExit:

            raiseCLIError(CLISyntaxError('Argument Syntax Error'))

        for name, arg in self.arguments.items():

            arg.value = getattr(self._parsed, name, arg.default)

        self._unparsed = []

        for term in unparsed:

            self._unparsed += split_input(' \'%s\' ' % term)

        self._parser_modified = False