import json
import os
import time  # type: ignore
import traceback
import types
from enum import Enum
from typing import Callable, Optional

import httpx
import requests  # type: ignore

import litellm
from litellm.utils import Choices, Message, ModelResponse


class AI21Error(Exception):
    def __init__(self, status_code, message):
        self.status_code = status_code
        self.message = message
        self.request = httpx.Request(
            method="POST", url="https://api.ai21.com/studio/v1/"
        )
        self.response = httpx.Response(status_code=status_code, request=self.request)
        super().__init__(
            self.message
        )  # Call the base class constructor with the parameters it needs


class AI21Config:
    """
    Reference: https://docs.ai21.com/reference/j2-complete-ref

    The class `AI21Config` provides configuration for the AI21's API interface. Below are the parameters:

    - `numResults` (int32): Number of completions to sample and return. Optional, default is 1. If the temperature is greater than 0 (non-greedy decoding), a value greater than 1 can be meaningful.

    - `maxTokens` (int32): The maximum number of tokens to generate per result. Optional, default is 16. If no `stopSequences` are given, generation stops after producing `maxTokens`.

    - `minTokens` (int32): The minimum number of tokens to generate per result. Optional, default is 0. If `stopSequences` are given, they are ignored until `minTokens` are generated.

    - `temperature` (float): Modifies the distribution from which tokens are sampled. Optional, default is 0.7. A value of 0 essentially disables sampling and results in greedy decoding.

    - `topP` (float): Used for sampling tokens from the corresponding top percentile of probability mass. Optional, default is 1. For instance, a value of 0.9 considers only tokens comprising the top 90% probability mass.

    - `stopSequences` (array of strings): Stops decoding if any of the input strings is generated. Optional.

    - `topKReturn` (int32): Range between 0 to 10, including both. Optional, default is 0. Specifies the top-K alternative tokens to return. A non-zero value includes the string representations and log-probabilities for each of the top-K alternatives at each position.

    - `frequencyPenalty` (object): Placeholder for frequency penalty object.

    - `presencePenalty` (object): Placeholder for presence penalty object.

    - `countPenalty` (object): Placeholder for count penalty object.
    """

    numResults: Optional[int] = None
    maxTokens: Optional[int] = None
    minTokens: Optional[int] = None
    temperature: Optional[float] = None
    topP: Optional[float] = None
    stopSequences: Optional[list] = None
    topKReturn: Optional[int] = None
    frequencePenalty: Optional[dict] = None
    presencePenalty: Optional[dict] = None
    countPenalty: Optional[dict] = None

    def __init__(
        self,
        numResults: Optional[int] = None,
        maxTokens: Optional[int] = None,
        minTokens: Optional[int] = None,
        temperature: Optional[float] = None,
        topP: Optional[float] = None,
        stopSequences: Optional[list] = None,
        topKReturn: Optional[int] = None,
        frequencePenalty: Optional[dict] = None,
        presencePenalty: Optional[dict] = None,
        countPenalty: Optional[dict] = None,
    ) -> None:
        locals_ = locals()
        for key, value in locals_.items():
            if key != "self" and value is not None:
                setattr(self.__class__, key, value)

    @classmethod
    def get_config(cls):
        return {
            k: v
            for k, v in cls.__dict__.items()
            if not k.startswith("__")
            and not isinstance(
                v,
                (
                    types.FunctionType,
                    types.BuiltinFunctionType,
                    classmethod,
                    staticmethod,
                ),
            )
            and v is not None
        }


def validate_environment(api_key):
    if api_key is None:
        raise ValueError(
            "Missing AI21 API Key - A call is being made to ai21 but no key is set either in the environment variables or via params"
        )
    headers = {
        "accept": "application/json",
        "content-type": "application/json",
        "Authorization": "Bearer " + api_key,
    }
    return headers


def completion(
    model: str,
    messages: list,
    api_base: str,
    model_response: ModelResponse,
    print_verbose: Callable,
    encoding,
    api_key,
    logging_obj,
    optional_params=None,
    litellm_params=None,
    logger_fn=None,
):
    headers = validate_environment(api_key)
    model = model
    prompt = ""
    for message in messages:
        if "role" in message:
            if message["role"] == "user":
                prompt += f"{message['content']}"
            else:
                prompt += f"{message['content']}"
        else:
            prompt += f"{message['content']}"

    ## Load Config
    config = litellm.AI21Config.get_config()
    for k, v in config.items():
        if (
            k not in optional_params
        ):  # completion(top_k=3) > ai21_config(top_k=3) <- allows for dynamic variables to be passed in
            optional_params[k] = v

    data = {
        "prompt": prompt,
        # "instruction": prompt, # some baseten models require the prompt to be passed in via the 'instruction' kwarg
        **optional_params,
    }

    ## LOGGING
    logging_obj.pre_call(
        input=prompt,
        api_key=api_key,
        additional_args={"complete_input_dict": data},
    )
    ## COMPLETION CALL
    response = requests.post(
        api_base + model + "/complete", headers=headers, data=json.dumps(data)
    )
    if response.status_code != 200:
        raise AI21Error(status_code=response.status_code, message=response.text)
    if "stream" in optional_params and optional_params["stream"] == True:
        return response.iter_lines()
    else:
        ## LOGGING
        logging_obj.post_call(
            input=prompt,
            api_key=api_key,
            original_response=response.text,
            additional_args={"complete_input_dict": data},
        )
        ## RESPONSE OBJECT
        completion_response = response.json()
        try:
            choices_list = []
            for idx, item in enumerate(completion_response["completions"]):
                if len(item["data"]["text"]) > 0:
                    message_obj = Message(content=item["data"]["text"])
                else:
                    message_obj = Message(content=None)
                choice_obj = Choices(
                    finish_reason=item["finishReason"]["reason"],
                    index=idx + 1,
                    message=message_obj,
                )
                choices_list.append(choice_obj)
            model_response.choices = choices_list  # type: ignore
        except Exception as e:
            raise AI21Error(
                message=traceback.format_exc(), status_code=response.status_code
            )

        ## CALCULATING USAGE - baseten charges on time, not tokens - have some mapping of cost here.
        prompt_tokens = len(encoding.encode(prompt))
        completion_tokens = len(
            encoding.encode(model_response["choices"][0]["message"].get("content"))
        )

        model_response.created = int(time.time())
        model_response.model = model
        setattr(
            model_response,
            "usage",
            litellm.Usage(
                prompt_tokens=prompt_tokens,
                completion_tokens=completion_tokens,
                total_tokens=prompt_tokens + completion_tokens,
            ),
        )
        return model_response


def embedding():
    # logic for parsing in - calling - parsing out model embedding calls
    pass
