import logging
from typing import Annotated, Optional, Tuple
import os
from fastapi import APIRouter, BackgroundTasks, HTTPException, Response, UploadFile, Depends
from components.llm.common import LlmParams, LlmPredictParams, Message
from components.llm.deepinfra_api import DeepInfraApi
from components.llm.llm_api import LlmApi
from components.llm.common import ChatRequest

from common.constants import PROMPT
from components.llm.prompts import SYSTEM_PROMPT
from components.llm.utils import append_llm_response_to_history, convert_to_openai_format
from components.nmd.aggregate_answers import preprocessed_chunks
from components.nmd.llm_chunk_search import LLMChunkSearch
from components.services.dataset import DatasetService
from common.configuration import Configuration, Query, SummaryChunks
from components.datasets.dispatcher import Dispatcher
from common.exceptions import LLMResponseException
from components.dbo.models.log import Log
from components.services.llm_config import LLMConfigService
from components.services.llm_prompt import LlmPromptService
from schemas.dataset import (Dataset, DatasetExpanded, DatasetProcessing,
                             SortQuery, SortQueryList)
import common.dependencies as DI
from sqlalchemy.orm import Session

router = APIRouter(prefix='/llm')
logger = logging.getLogger(__name__)

conf = DI.get_config()
llm_params = LlmParams(**{
    "url": conf.llm_config.base_url,
    "model": conf.llm_config.model,
    "tokenizer": "unsloth/Llama-3.3-70B-Instruct",
    "type": "deepinfra",
    "default": True,
    "predict_params": LlmPredictParams(
        temperature=0.15, top_p=0.95, min_p=0.05, seed=42,
        repetition_penalty=1.2, presence_penalty=1.1, n_predict=2000
    ),
    "api_key": os.environ.get(conf.llm_config.api_key_env),
    "context_length": 128000
})
#TODO: унести в DI
llm_api = DeepInfraApi(params=llm_params)

@router.post("/chunks")
def get_chunks(query: Query, dispatcher: Annotated[Dispatcher, Depends(DI.get_dispatcher)]) -> SummaryChunks:
    logger.info(f"Handling POST request to /chunks with query: {query.query}")
    try:
        result = dispatcher.search_answer(query)
        logger.info("Successfully retrieved chunks")
        return result
    except Exception as e:
        logger.error(f"Error retrieving chunks: {str(e)}")
        raise e


def llm_answer(query: str, answer_chunks: SummaryChunks, config: Configuration
    ) -> Tuple[str, str, str, int]:
        """
        Метод для поиска правильного ответа с помощью LLM.
        Args:
            query: Запрос.
            answer_chunks: Ответы векторного поиска и elastic.

        Returns:
            Возвращает исходные chunks из поисков, и chunk который выбрала модель.
        """
        prompt = PROMPT
        llm_search = LLMChunkSearch(config.llm_config, PROMPT, logger)
        return llm_search.llm_chunk_search(query, answer_chunks, prompt)
    

@router.post("/answer_llm")
def get_llm_answer(query: Query, chunks: SummaryChunks, db: Annotated[Session, Depends(DI.get_db)], config: Annotated[Configuration, Depends(DI.get_config)]):
    logger.info(f"Handling POST request to /answer_llm with query: {query.query}")
    try:
        text_chunks, answer_llm, llm_prompt, _ = llm_answer(query.query, chunks, config)

        if not answer_llm:
            logger.error("LLM returned empty response")
            raise LLMResponseException()

        log_entry = Log(
            llmPrompt=llm_prompt,
            llmResponse=answer_llm,
            userRequest=query.query,
            query_type=chunks.query_type,
            userName=query.userName,
        )
        with db() as session:
            session.add(log_entry)
            session.commit()
            session.refresh(log_entry)

        logger.info(f"Successfully processed LLM request, log_id: {log_entry.id}")
        return {
            "answer_llm": answer_llm,
            "log_id": log_entry.id,
        }

    except Exception as e:
        logger.error(f"Error processing LLM request: {str(e)}")
        raise e


@router.post("/chat")
async def chat(request: ChatRequest, config: Annotated[Configuration, Depends(DI.get_config)], llm_api: Annotated[DeepInfraApi, Depends(DI.get_llm_service)], prompt_service: Annotated[LlmPromptService, Depends(DI.get_llm_prompt_service)], llm_config_service: Annotated[LLMConfigService, Depends(DI.get_llm_config_service)], dispatcher: Annotated[Dispatcher, Depends(DI.get_dispatcher)]):
    try:
        p = llm_config_service.get_default()
        system_prompt = prompt_service.get_default()
        
        predict_params = LlmPredictParams(
            temperature=p.temperature, top_p=p.top_p, min_p=p.min_p, seed=p.seed,
            frequency_penalty=p.frequency_penalty, presence_penalty=p.presence_penalty, n_predict=p.n_predict, stop=[]
        )
        
        #TODO: Вынести
        def get_last_user_message(chat_request: ChatRequest) -> Optional[Message]:
            return next(
                (
                    msg for msg in reversed(chat_request.history) 
                    if msg.role == "user" and (msg.searchResults is None or not msg.searchResults)
                ),
                None
            )
            
        def insert_search_results_to_message(chat_request: ChatRequest, new_content: str) -> bool:
            for msg in reversed(chat_request.history):
                if msg.role == "user" and (msg.searchResults is None or not msg.searchResults):
                    msg.content = new_content
                    return True
            return False
    
        last_query = get_last_user_message(request)
        search_result = None
        
        if last_query:
            search_result = dispatcher.search_answer(Query(query=last_query.content, query_abbreviation=last_query.content))
            text_chunks = preprocessed_chunks(search_result, None, logger)
            
            new_message = f'{last_query.content} /n<search-results>/n{text_chunks}/n</search-results>'
            insert_search_results_to_message(request, new_message)
            
        response = await llm_api.predict_chat_stream(request, system_prompt.text, predict_params)
        result = append_llm_response_to_history(request, response)
        return result
    except Exception as e:
        logger.error(f"Error processing LLM request: {str(e)}", stack_info=True, stacklevel=10)
        return {"error": str(e)}