#! /bin/env python3
import os
import argparse

from revChatGPT.V1 import Chatbot
from typing import List
from marko.parser import Parser
from marko.block import FencedCode
from marko.inline import RawText

ENV_UUID = "GPTTRACE_CONV_UUID"
ENV_ACCESS_TOKEN = "GPTTRACE_ACCESS_TOKEN"

def main():
    parser = argparse.ArgumentParser(
        prog='GPTtrace',
        description='Use ChatGPT to write eBPF programs (bpftrace, etc.)')

    group = parser.add_mutually_exclusive_group()
    group.add_argument(
        "-e", "--explain", help="Let ChatGPT explain what's eBPF", action="store_true")
    group.add_argument(
        "-r", "--run", help="Generate commands using your input with ChatGPT, and run it", action="store", metavar="TEXT")

    parser.add_argument(
        "-u", "--uuid", help=f"Conversion UUID to use, or passed through environment variable `{ENV_UUID}`")
    parser.add_argument("-t", "--access-token",
                        help=f"ChatGPT access token, see `https://chat.openai.com/api/auth/session` or passed through `{ENV_ACCESS_TOKEN}`")
    args = parser.parse_args()

    if (args.explain or args.run) is None:
        parser.print_help()
        return

    access_token = args.access_token or os.environ.get(ENV_ACCESS_TOKEN, None)
    conv_uuid = args.uuid or os.environ.get(ENV_UUID, None)
    if access_token is None:
        print(
            f"Either provide your access token through `-t` or through environment variable {ENV_ACCESS_TOKEN}")
        return
    chatbot = Chatbot(config={"access_token": access_token})
    if args.explain:
        generate_result(chatbot, "解释一下什么是 eBPF", conv_uuid, True)
    elif args.run is not None:
        desc: str = args.run
        ret_val = generate_result(chatbot, desc, conv_uuid, True)
        # print(ret_val)
        parsed = extract_code_blocks(ret_val)
        print(f"Command to run: {parsed[0]}")
        os.system(parsed[0])

def generate_result(bot: Chatbot, text: str, session: str = None, print_out: bool = False) -> str:
    from io import StringIO
    prev_text = ""
    buf = StringIO()
    for data in bot.ask(
        text, conversation_id=session
    ):
        message = data["message"][len(prev_text):]
        if print_out:
            print(message, end="", flush=True)

        buf.write(message)
        prev_text = data["message"]
    if print_out:
        print()
    return buf.getvalue()

def extract_code_blocks(text: str) -> List[str]:
    result = []
    parser = Parser()
    for block in parser.parse(text).children:
        if type(block) is FencedCode:
            block: FencedCode
            blk: RawText = block.children[0]
            result.append(blk.children)
    return result

if __name__ == "__main__":
    main()