from dataclasses import dataclass
from typing import Any, Final, Optional, Union

import jinja2
from fastapi import Request
from loguru import logger

from aphrodite.config import ModelConfig
from aphrodite.endpoints.chat_utils import ChatTemplateContentFormatOption
from aphrodite.endpoints.logger import RequestLogger
# yapf conflicts with isort for this block
# yapf: disable
from aphrodite.endpoints.openai.protocol import (DetokenizeRequest,
                                                 DetokenizeResponse,
                                                 ErrorResponse,
                                                 TokenizeChatRequest,
                                                 TokenizeRequest,
                                                 TokenizeResponse,
                                                 TokenizerInfoResponse)
# yapf: enable
from aphrodite.endpoints.openai.serving_engine import OpenAIServing
from aphrodite.endpoints.openai.serving_models import OpenAIServingModels
from aphrodite.engine.protocol import EngineClient
from aphrodite.transformers_utils.tokenizer import AnyTokenizer


class OpenAIServingTokenization(OpenAIServing):

    def __init__(
        self,
        engine_client: EngineClient,
        model_config: ModelConfig,
        models: OpenAIServingModels,
        *,
        request_logger: Optional[RequestLogger],
        chat_template: Optional[str],
        chat_template_content_format: ChatTemplateContentFormatOption,
        log_error_stack: bool = False,
    ) -> None:
        super().__init__(engine_client=engine_client,
                         model_config=model_config,
                         models=models,
                         request_logger=request_logger,
                         log_error_stack=log_error_stack)

        self.chat_template = chat_template
        self.chat_template_content_format: Final = chat_template_content_format

    async def create_tokenize(
        self,
        request: TokenizeRequest,
        raw_request: Request,
    ) -> Union[TokenizeResponse, ErrorResponse]:
        error_check_ret = await self._check_model(request)
        if error_check_ret is not None:
            return error_check_ret

        request_id = f"tokn-{self._base_request_id(raw_request)}"

        try:
            lora_request = self._maybe_get_adapters(request)

            tokenizer = await self.engine_client.get_tokenizer(lora_request)

            if isinstance(request, TokenizeChatRequest):
                tool_dicts = (None if request.tools is None else
                              [tool.model_dump() for tool in request.tools])
                (
                    _,
                    request_prompts,
                    engine_prompts,
                ) = await self._preprocess_chat(
                    request,
                    tokenizer,
                    request.messages,
                    tool_dicts=tool_dicts,
                    chat_template=request.chat_template or self.chat_template,
                    chat_template_content_format=self.
                    chat_template_content_format,
                    add_generation_prompt=request.add_generation_prompt,
                    continue_final_message=request.continue_final_message,
                    chat_template_kwargs=request.chat_template_kwargs,
                    add_special_tokens=request.add_special_tokens,
                )
            else:
                (request_prompts,
                 engine_prompts) = await self._preprocess_completion(
                     request,
                     tokenizer,
                     request.prompt,
                     add_special_tokens=request.add_special_tokens,
                 )
        except (ValueError, TypeError, jinja2.TemplateError) as e:
            logger.exception("Error in preprocessing prompt inputs")
            return self.create_error_response(f"{e} {e.__cause__}")

        input_ids: list[int] = []
        for i, engine_prompt in enumerate(engine_prompts):
            self._log_inputs(request_id,
                             request_prompts[i],
                             params=None,
                             lora_request=lora_request)

            if isinstance(engine_prompt,
                          dict) and "prompt_token_ids" in engine_prompt:
                input_ids.extend(engine_prompt["prompt_token_ids"])

        token_strs = None
        if request.return_token_strs:
            token_strs = tokenizer.convert_ids_to_tokens(input_ids)

        return TokenizeResponse(tokens=input_ids,
                                token_strs=token_strs,
                                count=len(input_ids),
                                max_model_len=self.max_model_len)

    async def create_detokenize(
        self,
        request: DetokenizeRequest,
        raw_request: Request,
    ) -> Union[DetokenizeResponse, ErrorResponse]:
        error_check_ret = await self._check_model(request)
        if error_check_ret is not None:
            return error_check_ret

        request_id = f"tokn-{self._base_request_id(raw_request)}"

        lora_request = self._maybe_get_adapters(request)

        tokenizer = await self.engine_client.get_tokenizer(lora_request)

        self._log_inputs(request_id,
                         request.tokens,
                         params=None,
                         lora_request=lora_request)

        prompt_input = await self._tokenize_prompt_input_async(
            request,
            tokenizer,
            request.tokens,
        )
        input_text = prompt_input["prompt"]

        return DetokenizeResponse(prompt=input_text)

    async def get_tokenizer_info(
        self, ) -> Union[TokenizerInfoResponse, ErrorResponse]:
        """Get comprehensive tokenizer information."""
        try:
            tokenizer = await self.engine_client.get_tokenizer()
            info = TokenizerInfo(tokenizer, self.chat_template).to_dict()
            return TokenizerInfoResponse(**info)
        except Exception as e:
            return self.create_error_response(
                f"Failed to get tokenizer info: {str(e)}")


@dataclass
class TokenizerInfo:
    tokenizer: AnyTokenizer
    chat_template: Optional[str]

    def to_dict(self) -> dict[str, Any]:
        """Return the tokenizer configuration."""
        return self._get_tokenizer_config()

    def _get_tokenizer_config(self) -> dict[str, Any]:
        """Get tokenizer configuration directly from the tokenizer object."""
        config = dict(getattr(self.tokenizer, "init_kwargs", None) or {})

        # Remove file path fields
        config.pop("vocab_file", None)
        config.pop("merges_file", None)

        config = self._make_json_serializable(config)
        config["tokenizer_class"] = type(self.tokenizer).__name__
        if self.chat_template:
            config["chat_template"] = self.chat_template
        return config

    def _make_json_serializable(self, obj):
        """Convert any non-JSON-serializable objects to serializable format."""
        if hasattr(obj, "content"):
            return obj.content
        elif isinstance(obj, dict):
            return {k: self._make_json_serializable(v) for k, v in obj.items()}
        elif isinstance(obj, list):
            return [self._make_json_serializable(item) for item in obj]
        else:
            return obj
