''' Interactive Python interpreter '''

from typing import MutableMapping, Any, Callable, ContextManager, Dict, Optional

import builtins
import asyncio
import re

from ptpython.repl import PythonRepl
from prompt_toolkit.patch_stdout import patch_stdout as patch_stdout_context

import zasd.config as config

@asyncio.coroutine
async def repl():
    _globals = dict(
        config = DictObject(config.reference(), 'config'))

    _locals = dict(a = 'b')

    # Create REPL.
    _repl = PythonRepl(
        get_globals=lambda: _globals,
        get_locals=lambda: _locals,
        vi_mode=True)
    _repl.confirm_exit = False
    _repl.highlight_matching_parenthesis = True
    _repl.insert_blank_line_after_output = False
    try:
        with patch_stdout_context():
            await _repl.run_async()
    except EOFError:
        quit()

class DictObject:
    def __init__(self, dictionary: MutableMapping[str, Any], name):
        DictObject._dictionary = dictionary
        DictObject._name = name

    def __getattribute__(self, name):
        if not name in DictObject._dictionary:
            raise AttributeError("name '{}' is not defined".format(name))
        return DictObject._dictionary[name]

    def __setattr__(self, name, value):
        DictObject._dictionary[name] = value

    def __delattr__(self, name):
        if not name in DictObject._dictionary:
            raise AttributeError("name {} is not defined".format(name))
        del self._dictionary[name]

    def __dir__(self):
        return DictObject._dictionary.keys()

    def __repr__(self):
        return DictObject.make_repr(DictObject._dictionary, DictObject._name)

    @staticmethod
    def make_repr(obj, name, level=0, path=[]):
        if not isinstance(obj, dict):
            repstr = repr(obj)
            if re.search(r'^<.+>$', repstr):
                repstr = repstr[1:-1]
            return '{}.{} = {}'.format(name, '.'.join(path), repstr)
        else:
            keys = sorted(obj.keys())
            strs = list()
            for key in keys:
                value = DictObject.make_repr(
                    obj[key], name, level + 1, path = path + [key])
                strs.append(value)
            return '\n'.join(strs)