import requests
from uuid import uuid4
import json
from typing import Any, Dict, Optional

class OPENGPT:
    def __init__(
        self,
        max_tokens: int = 600,
        timeout: int = 30,
        intro: Optional[str] = None,
        filepath: Optional[str] = None,
        update_file: bool = True,
        proxies: Dict[str, str] = {},
        history_offset: int = 10250,
        act: Optional[str] = None,
    ):
        """Instantiates OPENGPT
        Args:
            max_tokens (int, optional): Maximum number of tokens to be generated upon completion. Defaults to 600.
            timeout (int, optional): Http request timeout. Defaults to 30.
            intro (str, optional): Conversation introductory prompt. Defaults to None.
            filepath (str, optional): Path to file containing conversation history. Defaults to None.
            update_file (bool, optional): Add new prompts and responses to the file. Defaults to True.
            proxies (dict, optional): Http request proxies. Defaults to {}.
            history_offset (int, optional): Limit conversation history to this number of last texts. Defaults to 10250.
            act (str|int, optional): Awesome prompt key or index. (Used as intro). Defaults to None.
        """
        self.session = requests.Session()
        self.max_tokens_to_sample = max_tokens
        self.chat_endpoint = "https://opengpts-example-vz4y4ooboq-uc.a.run.app/runs/stream"
        self.stream_chunk_size = 64
        self.timeout = timeout
        self.last_response = {}
        self.assistant_id = "bca37014-6f97-4f2b-8928-81ea8d478d88"
        self.authority = "opengpts-example-vz4y4ooboq-uc.a.run.app"

        self.headers = {
            "authority": self.authority,
            "accept": "text/event-stream",
            "accept-language": "en-US,en;q=0.7",
            "cache-control": "no-cache",
            "content-type": "application/json",
            "origin": "https://opengpts-example-vz4y4ooboq-uc.a.run.app",
            "pragma": "no-cache",
            "referer": "https://opengpts-example-vz4y4ooboq-uc.a.run.app/",
            "sec-fetch-site": "same-origin",
            "sec-gpc": "1",
            "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
        }

    def ask(
        self,
        prompt: str,
        stream: bool = False,
        raw: bool = False,
        optimizer: Optional[str] = None,
    ) -> Dict[str, Any]:
        """Chat with AI
        Args:
            prompt (str): Prompt to be send.
            stream (bool, optional): Flag for streaming response. Defaults to False.
            raw (bool, optional): Stream back raw response as received. Defaults to False.
            optimizer (str, optional): Prompt optimizer name - `[code, shell_command]`. Defaults to None.
        Returns:
           dict: Response from the AI.
        """
        self.session.headers.update(self.headers)
        self.session.headers.update(
            dict(
                cookie=f"opengpts_user_id={uuid4().__str__()}",
            )
        )
        payload = {
            "input": [
                {
                    "additional_kwargs": {},
                    "type": "human",
                    "example": False,
                },
            ],
            "assistant_id": self.assistant_id,
            "thread_id": "",
        }

        def for_stream():
            response = self.session.post(
                self.chat_endpoint, json=payload, stream=True, timeout=self.timeout
            )
            if (
                not response.ok
                or not response.headers.get("Content-Type")
                == "text/event-stream; charset=utf-8"
            ):
                raise Exception(
                    f"Failed to generate response - ({response.status_code}, {response.reason}) - {response.text}"
                )

            for value in response.iter_lines(
                decode_unicode=True,
                chunk_size=self.stream_chunk_size,
            ):
                try:
                    modified_value = re.sub("data:", "", value)
                    resp = json.loads(modified_value)
                    if len(resp) == 1:
                        continue
                    self.last_response.update(resp[1])
                    yield value if raw else resp[1]
                except json.decoder.JSONDecodeError:
                    pass

        def for_non_stream():
            for _ in for_stream():
                pass
            return self.last_response

        return for_stream() if stream else for_non_stream()

    def chat(
        self,
        prompt: str,
        stream: bool = False,
        optimizer: Optional[str] = None,
    ) -> str:
        """Generate response `str`
        Args:
            prompt (str): Prompt to be send.
            stream (bool, optional): Flag for streaming response. Defaults to False.
            optimizer (str, optional): Prompt optimizer name - `[code, shell_command]`. Defaults to None.
        Returns:
            str: Response generated
        """
        def for_stream():
            for response in self.ask(prompt, True):
                yield self.get_message(response)

        def for_non_stream():
            return self.get_message(self.ask(prompt, False, optimizer=optimizer))

        return for_stream() if stream else for_non_stream()

    def get_message(self, response: Dict[str, Any]) -> str:
        """Retrieves message only from response
        Args:
            response (dict): Response generated by `self.ask`
        Returns:
            str: Message extracted
        """
        assert isinstance(response, dict), "Response should be of dict data-type only"
        return response["content"]