"""
Evennia MUD/MUX/MU* creation system

This is the main top-level API for Evennia. You can also explore the
evennia library by accessing evennia.<subpackage> directly. From
inside the game you can read docs of all object by viewing its
`__doc__` string, such as through

    @py evennia.ObjectDB.__doc__

For full functionality you should explore this module via a django-
aware shell. Go to your game directory and use the command

   evennia shell

to launch such a shell (using python or ipython depending on your install).
See www.evennia.com for full documentation.

"""
from __future__ import print_function
from __future__ import absolute_import
from builtins import object

# Delayed loading of properties

# Typeclasses

DefaultAccount = None
DefaultGuest = None
DefaultObject = None
DefaultCharacter = None
DefaultRoom = None
DefaultExit = None
DefaultChannel = None
DefaultScript = None

# Database models
ObjectDB = None
AccountDB = None
ScriptDB = None
ChannelDB = None
Msg = None

# commands
Command = None
CmdSet = None
default_cmds = None
syscmdkeys = None
InterruptCommand = None

# search functions
search_object = None
search_script = None
search_account = None
search_channel = None
search_message = None
search_help = None
search_tag = None

# create functions
create_object = None
create_script = None
create_account = None
create_channel = None
create_message = None
create_help_entry = None

# utilities
settings = None
lockfuncs = None
inputhandler = None
logger = None
gametime = None
ansi = None
spawn = None
managers = None
contrib = None
EvMenu = None
EvTable = None
EvForm = None
EvEditor = None
EvMore = None

# Handlers
SESSION_HANDLER = None
TASK_HANDLER = None
TICKER_HANDLER = None
MONITOR_HANDLER = None
CHANNEL_HANDLER = None


def _create_version():
    """
    Helper function for building the version string
    """
    import os
    from subprocess import check_output, CalledProcessError, STDOUT

    version = "Unknown"
    root = os.path.dirname(os.path.abspath(__file__))
    try:
        with open(os.path.join(root, "VERSION.txt"), 'r') as f:
            version = f.read().strip()
    except IOError as err:
        print(err)
    try:
        version = "%s (rev %s)" % (version, check_output("git rev-parse --short HEAD", shell=True, cwd=root, stderr=STDOUT).strip())
    except (IOError, CalledProcessError):
        # ignore if we cannot get to git
        pass
    return version


__version__ = _create_version()
del _create_version


def _init():
    """
    This function is called automatically by the launcher only after
    Evennia has fully initialized all its models. It sets up the API
    in a safe environment where all models are available already.
    """
    global DefaultAccount, DefaultObject, DefaultGuest, DefaultCharacter
    global DefaultRoom, DefaultExit, DefaultChannel, DefaultScript
    global ObjectDB, AccountDB, ScriptDB, ChannelDB, Msg
    global Command, CmdSet, default_cmds, syscmdkeys, InterruptCommand
    global search_object, search_script, search_account, search_channel, search_help, search_tag, search_message
    global create_object, create_script, create_account, create_channel, create_message, create_help_entry
    global settings, lockfuncs, logger, utils, gametime, ansi, spawn, managers
    global contrib, TICKER_HANDLER, MONITOR_HANDLER, SESSION_HANDLER, CHANNEL_HANDLER, TASK_HANDLER
    global EvMenu, EvTable, EvForm, EvMore, EvEditor

    from .accounts.accounts import DefaultAccount
    from .accounts.accounts import DefaultGuest
    from .objects.objects import DefaultObject
    from .objects.objects import DefaultCharacter
    from .objects.objects import DefaultRoom
    from .objects.objects import DefaultExit
    from .comms.comms import DefaultChannel
    from .scripts.scripts import DefaultScript

    # Database models
    from .objects.models import ObjectDB
    from .accounts.models import AccountDB
    from .scripts.models import ScriptDB
    from .comms.models import ChannelDB
    from .comms.models import Msg

    # commands
    from .commands.command import Command, InterruptCommand
    from .commands.cmdset import CmdSet

    # search functions
    from .utils.search import search_object
    from .utils.search import search_script
    from .utils.search import search_account
    from .utils.search import search_message
    from .utils.search import search_channel
    from .utils.search import search_help
    from .utils.search import search_tag

    # create functions
    from .utils.create import create_object
    from .utils.create import create_script
    from .utils.create import create_account
    from .utils.create import create_channel
    from .utils.create import create_message
    from .utils.create import create_help_entry

    # utilities
    from django.conf import settings
    from .locks import lockfuncs
    from .utils import logger
    from .utils import gametime
    from .utils import ansi
    from .prototypes.spawner import spawn
    from . import contrib
    from .utils.evmenu import EvMenu
    from .utils.evtable import EvTable
    from .utils.evform import EvForm
    from .utils.eveditor import EvEditor

    # handlers
    from .scripts.tickerhandler import TICKER_HANDLER
    from .scripts.taskhandler import TASK_HANDLER
    from .server.sessionhandler import SESSION_HANDLER
    from .comms.channelhandler import CHANNEL_HANDLER
    from .scripts.monitorhandler import MONITOR_HANDLER

    # API containers

    class _EvContainer(object):
        """
        Parent for other containers

        """

        def _help(self):
            "Returns list of contents"
            names = [name for name in self.__class__.__dict__ if not name.startswith('_')]
            names += [name for name in self.__dict__ if not name.startswith('_')]
            print(self.__doc__ + "-" * 60 + "\n" + ", ".join(names))
        help = property(_help)

    class DBmanagers(_EvContainer):
        """
        Links to instantiated database managers.

        helpentry - HelpEntry.objects
        accounts - AccountDB.objects
        scripts - ScriptDB.objects
        msgs    - Msg.objects
        channels - Channel.objects
        objects - ObjectDB.objects
        serverconfigs = ServerConfig.objects
        tags - Tags.objects
        attributes - Attributes.objects

        """
        from .help.models import HelpEntry
        from .accounts.models import AccountDB
        from .scripts.models import ScriptDB
        from .comms.models import Msg, ChannelDB
        from .objects.models import ObjectDB
        from .server.models import ServerConfig
        from .typeclasses.attributes import Attribute
        from .typeclasses.tags import Tag

        # create container's properties
        helpentries = HelpEntry.objects
        accounts = AccountDB.objects
        scripts = ScriptDB.objects
        msgs = Msg.objects
        channels = ChannelDB.objects
        objects = ObjectDB.objects
        serverconfigs = ServerConfig.objects
        attributes = Attribute.objects
        tags = Tag.objects
        # remove these so they are not visible as properties
        del HelpEntry, AccountDB, ScriptDB, Msg, ChannelDB
        #del ExternalChannelConnection
        del ObjectDB, ServerConfig, Tag, Attribute

    managers = DBmanagers()
    del DBmanagers

    class DefaultCmds(_EvContainer):
        """
        This container holds direct shortcuts to all default commands in Evennia.

        To access in code, do 'from evennia import default_cmds' then
        access the properties on the imported default_cmds object.

        """

        from .commands.default.cmdset_character import CharacterCmdSet
        from .commands.default.cmdset_account import AccountCmdSet
        from .commands.default.cmdset_unloggedin import UnloggedinCmdSet
        from .commands.default.cmdset_session import SessionCmdSet
        from .commands.default.muxcommand import MuxCommand, MuxAccountCommand

        def __init__(self):
            "populate the object with commands"
            def add_cmds(module):
                "helper method for populating this object with cmds"
                from evennia.utils import utils
                cmdlist = utils.variable_from_module(module, module.__all__)
                self.__dict__.update(dict([(c.__name__, c) for c in cmdlist]))

            from .commands.default import (admin, batchprocess,
                                           building, comms, general,
                                           account, help, system, unloggedin)
            add_cmds(admin)
            add_cmds(building)
            add_cmds(batchprocess)
            add_cmds(building)
            add_cmds(comms)
            add_cmds(general)
            add_cmds(account)
            add_cmds(help)
            add_cmds(system)
            add_cmds(unloggedin)

    default_cmds = DefaultCmds()
    del DefaultCmds

    class SystemCmds(_EvContainer):
        """
        Creating commands with keys set to these constants will make
        them system commands called as a replacement by the parser when
        special situations occur. If not defined, the hard-coded
        responses in the server are used.

        CMD_NOINPUT - no input was given on command line
        CMD_NOMATCH - no valid command key was found
        CMD_MULTIMATCH - multiple command matches were found
        CMD_CHANNEL - the command name is a channel name
        CMD_LOGINSTART - this command will be called as the very
                         first command when an account connects to
                         the server.

        To access in code, do 'from evennia import syscmdkeys' then
        access the properties on the imported syscmdkeys object.

        """
        from .commands import cmdhandler
        CMD_NOINPUT = cmdhandler.CMD_NOINPUT
        CMD_NOMATCH = cmdhandler.CMD_NOMATCH
        CMD_MULTIMATCH = cmdhandler.CMD_MULTIMATCH
        CMD_CHANNEL = cmdhandler.CMD_CHANNEL
        CMD_LOGINSTART = cmdhandler.CMD_LOGINSTART
        del cmdhandler
    syscmdkeys = SystemCmds()
    del SystemCmds
    del _EvContainer


del object
del absolute_import
del print_function


def set_trace(debugger="auto", term_size=(140, 40)):
    """
    Helper function for running a debugger inside the Evennia event loop.

    Args:
        debugger (str, optional): One of 'auto', 'pdb' or 'pudb'. Pdb is the standard debugger. Pudb
            is an external package with a different, more 'graphical', ncurses-based UI. With
            'auto', will use pudb if possible, otherwise fall back to pdb. Pudb is available through
            `pip install pudb`.
        term_size (tuple, optional): Only used for Pudb and defines the size of the terminal
            (width, height) in number of characters.

    Notes:
        To use:

        1) add this to a line to act as a breakpoint for entering the debugger:

            from evennia import set_trace; set_trace()

        2) restart evennia in interactive mode

            evennia istart

        3) debugger will appear in the interactive terminal when breakpoint is reached. Exit
           with 'q', remove the break line and restart server when finished.

    """
    import sys
    dbg = None
    pudb_mode = False

    if debugger in ('auto', 'pudb'):
        try:
            from pudb import debugger
            dbg = debugger.Debugger(stdout=sys.__stdout__,
                                    term_size=term_size)
            pudb_mode = True
        except ImportError:
            if debugger == 'pudb':
                raise
            pass

    if not dbg:
        import pdb
        dbg = pdb.Pdb(stdout=sys.__stdout__)
        pudb_mode = False

    if pudb_mode:
        # Stopped at breakpoint. Press 'n' to continue into the code.
        dbg.set_trace()
    else:
        # Start debugger, forcing it up one stack frame (otherwise `set_trace` will start debugger
        # this point, not the actual code location)
        dbg.set_trace(sys._getframe().f_back)
