import argparse
from pathlib import Path
from itertools import zip_longest
from ..configuration import Config
from ..chat import ChatDB
from ..message import Message, Question
from ..ai_factory import create_ai
from ..ai import AI, AIResponse


def create_message(chat: ChatDB, args: argparse.Namespace) -> Message:
    """
    Creates (and writes) a new message from the given arguments.
    """
    question_parts = []
    question_list = args.ask if args.ask is not None else []
    source_list = args.source if args.source is not None else []
    code_list = args.source_code if args.source_code is not None else []

    for question, source, code in zip_longest(question_list, source_list, code_list, fillvalue=None):
        if question is not None and len(question.strip()) > 0:
            question_parts.append(question)
        if source is not None and len(source) > 0:
            with open(source) as r:
                content = r.read().strip()
                if len(content) > 0:
                    question_parts.append(content)
        if code is not None and len(code) > 0:
            with open(code) as r:
                content = r.read().strip()
                if len(content) > 0:
                    question_parts.append(f"```\n{content}\n```")

    full_question = '\n\n'.join(question_parts)

    message = Message(question=Question(full_question),
                      tags=args.output_tags,  # FIXME
                      ai=args.AI,
                      model=args.model)
    chat.add_to_cache([message])
    return message


def question_cmd(args: argparse.Namespace, config: Config) -> None:
    """
    Handler for the 'question' command.
    """
    chat = ChatDB.from_dir(cache_path=Path('.'),
                           db_path=Path(config.db))
    # if it's a new question, create and store it immediately
    if args.ask or args.create:
        message = create_message(chat, args)
    if args.create:
        return

    # create the correct AI instance
    ai: AI = create_ai(args, config)
    if args.ask:
        response: AIResponse = ai.request(message,
                                          chat,
                                          args.num_answers,  # FIXME
                                          args.output_tags)  # FIXME
        assert response
        # TODO:
        # * add answer to the message above (and create
        #   more messages for any additional answers)
        pass
    elif args.repeat:
        lmessage = chat.latest_message()
        assert lmessage
        # TODO: repeat either the last question or the
        # one(s) given in 'args.repeat' (overwrite
        # existing ones if 'args.overwrite' is True)
        pass
    elif args.process:
        # TODO: process either all questions without an
        # answer or the one(s) given in 'args.process'
        pass