from langchain_core.messages import HumanMessage, SystemMessage
from langchain_core.runnables.config import RunnableConfig
from langchain_gigachat.chat_models import GigaChat
import os
import re
from datetime import datetime
from pydantic import Field
from dotenv import load_dotenv
from typing import Any, Optional
import logging
from pathlib import Path
load_dotenv()

class AnswerGigaChat(GigaChat):
    THRESHOLD_INPUT_SYMBOLS: int = 40000
    THRESHOLD_COST: float = 5000.0
    ERROR_MESSAGE_EXCEEDED_COST: str = "\n\n\n\n\nALERT!!!!!!\nCOST NORM WAS EXCEEDED!!!!!!!!\n{} >= " + str(THRESHOLD_COST) + "\n\n\n\n"
    COST_PER_INPUT_TOKEN: float = 0.0
    COST_PER_OUTPUT_TOKEN: float = 1.95e-3
    LOG_FILE_PATH: str = os.path.join("/tmp", "gigachat.log")
    
    logger: Any = Field(default=None)

    def __init__(self):
        super().__init__(credentials="YWZhMjk1OTktNGY3My00ZTNkLTliZDMtMDE2MzU5MzcxNjAyOjc1ZjU4OTJjLTg3MDctNGVjMi04YTVhLTY2NGFlZTQ3MzQ4NQ==", # os.getenv("GIGACHAT_CREDENTIALS"),
                        verify_ssl_certs=False,
                        model="GigaChat-Max",
                        scope="GIGACHAT_API_PERS")
        self.logger = self._setup_logger(self.LOG_FILE_PATH)

    def _setup_logger(self, log_file: str) -> logging.Logger:
        logger = logging.getLogger(__name__)
        logger.setLevel(logging.INFO)

        if not logger.handlers:
            log_file = Path(log_file)
            log_file.parent.mkdir(parents=True, exist_ok=True)  # Создать папку для логов

            formatter = logging.Formatter(
                '%(asctime)s - %(name)s - %(levelname)s - '
                'input_tokens=%(input_tokens)d - output_tokens=%(output_tokens)d - '
                'cost=%(cost).5f - execution_time=%(execution_time)s - '
                'status=%(status)s'
            )

            file_handler = logging.FileHandler(log_file)
            file_handler.setFormatter(formatter)
            logger.addHandler(file_handler)

        return logger

    def invoke(self, input: Any, config: Optional[RunnableConfig] = None, **kwargs: Any) -> Any:
        # Извлекаем сообщения из входных данных
        if isinstance(input, list):
            # Если input - это список сообщений (например, [SystemMessage, HumanMessage])
            messages = input
        elif isinstance(input, dict) and "messages" in input:
            # Если input - это dict с ключом "messages" (формат LangGraph)
            messages = [
                SystemMessage(content=msg["content"]) if msg["role"] == "system"
                else HumanMessage(content=msg["content"])
                for msg in input["messages"]
                if msg["role"] in ["system", "user"]
            ]
        elif hasattr(input, "messages"):
            # Если input - это объект с атрибутом messages
            messages = input.messages
        else:
            # Попробуем интерпретировать input как одно сообщение
            messages = [HumanMessage(content=str(input))]

        # Проверяем длину ввода
        system_content = ""
        user_content = ""
        for msg in messages:
            if isinstance(msg, SystemMessage):
                system_content += msg.content
            elif isinstance(msg, HumanMessage):
                user_content += msg.content

        if not self._check_input_length(system_content, user_content):
            raise ValueError("Too long query")

        # Вызываем родительский метод invoke
        response = super().invoke(messages, config=config, **kwargs)

        # Логируем информацию о запросе
        num_input_tokens = response.usage_metadata["input_tokens"]
        num_output_tokens = response.usage_metadata["output_tokens"]
        cost = self._calculate_response_cost(num_input_tokens, num_output_tokens)
        self.logger.info(
            "got answer",
            extra={
                "input_tokens": num_input_tokens,
                "output_tokens": num_output_tokens,
                "cost": cost,
                "execution_time": str(datetime.now()),
                "status": "success"
            }
        )

        # Проверяем общую стоимость
        total_cost = self._calculate_total_cost()
        if total_cost >= self.THRESHOLD_COST:
            error_message = self.ERROR_MESSAGE_EXCEEDED_COST.format(total_cost)
            print(error_message)
            response.content = error_message + response.content

        # Возвращаем ответ в соответствующем формате
        if isinstance(input, dict):
            return {**input, "messages": [{"role": "assistant", "content": response.content}]}
        return response
    
    def _check_input_length(self, system_message: str, user_message: str) -> bool:
        return len(system_message) + len(user_message) < self.THRESHOLD_INPUT_SYMBOLS
    
    def _calculate_response_cost(self, num_input_tokens: int, num_output_tokens: int) -> float:
        return num_input_tokens * self.COST_PER_INPUT_TOKEN + \
        num_output_tokens * self.COST_PER_OUTPUT_TOKEN
        
    def _calculate_total_cost(self, 
                              start_date: str = '2025-06-01', 
                              end_date: str = str(datetime.now().date())):
        total_cost = 0.0
        start_date = datetime.strptime(start_date, '%Y-%m-%d').date()
        end_date = datetime.strptime(end_date, '%Y-%m-%d').date()
        
        # Регулярное выражение для извлечения даты и cost из строки лога
        log_pattern = re.compile(
            r'^(?P<date>\d{4}-\d{2}-\d{2}) \d{2}:\d{2}:\d{2},\d{3} - .*? - .*? - '
            r'input_tokens=\d+ - output_tokens=\d+ - '
            r'cost=(?P<cost>\d+\.\d{2}) - '
            r'execution_time=.*? - status=.*$'
        )
        
        with open(self.LOG_FILE_PATH, 'r', encoding='utf-8') as file:
            for line in file:
                match = log_pattern.match(line)
                if match:
                    log_date_str = match.group('date')
                    log_date = datetime.strptime(log_date_str, '%Y-%m-%d').date()
                    cost = float(match.group('cost'))
                    
                    if start_date <= log_date <= end_date:
                        total_cost += cost
        
        return total_cost