#!/usr/bin/env python3
import argparse
import logging
import typing as t

from gradio_ui import build_gradio_ui_for
from koboldai_client import run_raw_inference_on_kai, wait_for_kai_server
from parsing import parse_messages_from_str
from prompting import build_prompt_for
from utils import clear_stdout

logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)

# For UI debugging purposes.
DONT_USE_MODEL = False


def main(server_port: int,
         share_gradio_link: bool = False,
         model_name: t.Optional[str] = None,
         koboldai_url: t.Optional[str] = None) -> None:
    '''Script entrypoint.'''
    if model_name and not DONT_USE_MODEL:
        from model import build_model_and_tokenizer_for, run_raw_inference
        model, tokenizer = build_model_and_tokenizer_for(model_name)
    else:
        model, tokenizer = None, None

    def inference_fn(history: t.List[str], user_input: str,
                     generation_settings: t.Dict[str, t.Any],
                     *char_settings: t.Any) -> str:
        if DONT_USE_MODEL:
            return "Mock response for UI tests."

        # Brittle. Comes from the order defined in gradio_ui.py.
        [
            char_name,
            _user_name,
            char_persona,
            char_greeting,
            world_scenario,
            example_dialogue,
        ] = char_settings

        # If we're just starting the conversation and the character has a greeting
        # configured, return that instead. This is a workaround for the fact that
        # Gradio assumed that a chatbot cannot possibly start a conversation, so we
        # can't just have the greeting there automatically, it needs to be in
        # response to a user message.
        if len(history) == 0 and char_greeting is not None:
            return f"{char_name}: {char_greeting}"

        prompt = build_prompt_for(history=history,
                                  user_message=user_input,
                                  char_name=char_name,
                                  char_persona=char_persona,
                                  example_dialogue=example_dialogue,
                                  world_scenario=world_scenario)

        if model and tokenizer:
            model_output = run_raw_inference(model, tokenizer, prompt,
                                             user_input, **generation_settings)
        elif koboldai_url:
            model_output = f"{char_name}:"
            model_output += run_raw_inference_on_kai(koboldai_url, prompt,
                                                     **generation_settings)
        else:
            raise Exception(
                "Not using local inference, but no Kobold instance URL was"
                " given. Nowhere to perform inference on.")

        generated_messages = parse_messages_from_str(model_output,
                                                     ["You", char_name])
        logger.debug("Parsed model response is: `%s`", generated_messages)
        bot_message = generated_messages[0]

        return bot_message

    ui = build_gradio_ui_for(inference_fn, for_kobold=koboldai_url is not None)
    ui.launch(server_port=server_port, share=share_gradio_link)


def _parse_args_from_argv() -> argparse.Namespace:
    '''Parses arguments coming in from the command line.'''
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-m",
        "--model-name",
        help=
        "HuggingFace Transformers model name, if not using a KoboldAI instance as an inference server.",
    )
    parser.add_argument(
        "-p",
        "--port",
        type=int,
        default=3000,
        help="Port to listen on.",
    )
    parser.add_argument(
        "-k",
        "--koboldai-url",
        help="URL to a KoboldAI instance to use as an inference server.",
    )
    parser.add_argument(
        "-s",
        "--share",
        action="store_true",
        help="Enable to generate a public link for the Gradio UI.",
    )

    return parser.parse_args()


if __name__ == "__main__":
    args = _parse_args_from_argv()

    if args.koboldai_url:
        # I have no idea how long a safe wait time is, but we'd rather wait for
        # too long rather than just cut the user off _right_ when the setup is
        # about to finish, so let's pick something absurd here.
        wait_for_kai_server(args.koboldai_url, max_wait_time_seconds=60 * 30)

        # Clear out any Kobold logs so the user can clearly see the Gradio link
        # that's about to show up afterwards.
        clear_stdout()

    main(model_name=args.model_name,
         server_port=args.port,
         koboldai_url=args.koboldai_url,
         share_gradio_link=args.share)