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# Copyright 2012-2013 GRNET S.A. All rights reserved.

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from kamaki.clients import Client

class Command(object):

    """Store a command and the next-level (2 levels)"""

    _name = None

    path = None

    cmd_class = None

    subcommands = {}

    help = ' '

    def __init__(self, path, help=' ', subcommands={}, cmd_class=None):

        self.path = path

        self.help = help

        self.subcommands = dict(subcommands)

        self.cmd_class = cmd_class

    @property

    def name(self):

        if self._name is None:

            self._name = self.path.split('_')[-1]

        return str(self._name)

    def add_subcmd(self, subcmd):

        if subcmd.path == '%s_%s' % (self.path, subcmd.name):

            self.subcommands[subcmd.name] = subcmd

            return True

        return False

    def get_subcmd(self, name):

        try:

            return self.subcommands[name]

        except KeyError:

            return None

    def contains(self, name):

        """Check if a name is a direct child of self"""

        return name in self.subcommands

    @property

    def is_command(self):

        return self.cmd_class is not None and len(self.subcommands) == 0

    @property

    def has_description(self):

        return len(self.help.strip()) > 0

    @property

    def description(self):

        return self.help

    @property

    def parent_path(self):

        parentpath, sep, name = self.path.rpartition('_')

        return parentpath

    def set_class(self, cmd_class):

        self.cmd_class = cmd_class

    def get_class(self):

        return self.cmd_class

    def has_subname(self, subname):

        return subname in self.subcommands

    def get_subnames(self):

        return self.subcommands.keys()

    def get_subcommands(self):

        return self.subcommands.values()

    def sublen(self):

        return len(self.subcommands)

    def parse_out(self, args):

        cmd = self

        index = 0

        for term in args:

            try:

                cmd = cmd.subcommands[term]

            except KeyError:

                break

            index += 1

        return cmd, args[index:]

    def pretty_print(self, recursive=False):

        print('Path: %s (Name: %s) is_cmd: %s\n\thelp: %s' % (

            self.path,

            self.name,

            self.is_command,

            self.help))

        for cmd in self.get_subcommands():

            cmd.pretty_print(recursive)

class CommandTree(object):

    groups = {}

    _all_commands = {}

    name = None

    description = None

    def __init__(self, name, description=''):

        self.name = name

        self.description = description

    def exclude(self, groups_to_exclude=[]):

        for group in groups_to_exclude:

            self.groups.pop(group, None)

    def add_command(self, command_path, description=None, cmd_class=None):

        terms = command_path.split('_')

        try:

            cmd = self.groups[terms[0]]

        except KeyError:

            cmd = Command(terms[0])

            self.groups[terms[0]] = cmd

            self._all_commands[terms[0]] = cmd

        path = terms[0]

        for term in terms[1:]:

            path += '_' + term

            try:

                cmd = cmd.subcommands[term]

            except KeyError:

                new_cmd = Command(path)

                self._all_commands[path] = new_cmd

                cmd.add_subcmd(new_cmd)

                cmd = new_cmd

        if cmd_class:

            cmd.set_class(cmd_class)

        if description is not None:

            cmd.help = description

    def find_best_match(self, terms):

        """Find a command that best matches a given list of terms

        :param terms: (list of str) match them against paths in cmd_tree

        :returns: (Command, list) the matching command, the remaining terms

        """

        path = []

        for term in terms:

            check_path = path + [term]

            if '_'.join(check_path) not in self._all_commands:

                break

            path = check_path

        if path:

            return (self._all_commands['_'.join(path)], terms[len(path):])

        return (None, terms)

    def add_tree(self, new_tree):

        tname = new_tree.name

        tdesc = new_tree.description

        self.groups.update(new_tree.groups)

        self._all_commands.update(new_tree._all_commands)

        self.set_description(tname, tdesc)

    def has_command(self, path):

        return path in self._all_commands

    def get_command(self, path):

        return self._all_commands[path]

    def get_groups(self):

        return self.groups.values()

    def get_group_names(self):

        return self.groups.keys()

    def set_description(self, path, description):

        self._all_commands[path].help = description

    def get_description(self, path):

        return self._all_commands[path].help

    def set_class(self, path, cmd_class):

        self._all_commands[path].set_class(cmd_class)

    def get_class(self, path):

        return self._all_commands[path].get_class()

    def get_subnames(self, path=None):

        if path in (None, ''):

            return self.get_group_names()

        return self._all_commands[path].get_subnames()

    def get_subcommands(self, path=None):

        if path in (None, ''):

            return self.get_groups()

        return self._all_commands[path].get_subcommands()

    def get_parent(self, path):

        if '_' not in path:

            return None

        terms = path.split('_')

        parent_path = '_'.join(terms[:-1])

        return self._all_commands[parent_path]

    def get_closest_ancestor_command(self, path):

        path, sep, name = path.rpartition('_')

        while len(path) > 0:

            cmd = self._all_commands[path]

            if cmd.is_command:

                return cmd

            path, sep, name = path.rpartition('_')

        return None

        if '_' not in path:

            return None

        terms = path.split()[:-1]

        while len(terms) > 0:

            tmp_path = '_'.join(terms)

            cmd = self._all_commands[tmp_path]

            if cmd.is_command:

                return cmd

            terms = terms[:-1]

        raise KeyError('No ancestor commands')

    def pretty_print(self, group=None):

        if group is None:

            for group in self.groups:

                self.pretty_print(group)

        else:

            self.groups[group].pretty_print(recursive=True)