"""
LLM Helper for visualization agents
Handles OpenAI API calls with retry logic and error handling
"""
import os
import json
from typing import Dict, Any, Optional
from openai import OpenAI
from dotenv import load_dotenv
import time

# Load environment variables from root directory (parent of visualization)
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
VISUALIZATION_DIR = os.path.dirname(SCRIPT_DIR)
ROOT_DIR = os.path.dirname(VISUALIZATION_DIR)
load_dotenv(os.path.join(ROOT_DIR, '.env'))


class LLMHelper:
    """
    Helper class for LLM interactions
    """

    def __init__(self, model: str = "gpt-5-nano", temperature: float = 1):
        """
        Initialize LLM helper

        Args:
            model: Model name to use
            temperature: Temperature for generation
        """
        self.model = model
        self.temperature = temperature
        self.api_key = os.getenv('OPENAI_API_KEY')

        if not self.api_key:
            raise ValueError("OPENAI_API_KEY not found in environment variables")

        self.client = OpenAI(api_key=self.api_key)

    def get_completion(
        self,
        prompt: str,
        system_message: Optional[str] = None,
        max_retries: int = 3,
        json_mode: bool = False
    ) -> Dict[str, Any]:
        """
        Get completion from LLM with retry logic

        Args:
            prompt: User prompt
            system_message: Optional system message
            max_retries: Maximum number of retries
            json_mode: Whether to force JSON response

        Returns:
            Dictionary with response data
        """
        messages = []

        if system_message:
            messages.append({"role": "system", "content": system_message})

        messages.append({"role": "user", "content": prompt})

        for attempt in range(max_retries):
            try:
                # Prepare API call parameters
                api_params = {
                    "model": self.model,
                    "messages": messages,
                    "temperature": self.temperature,
                    "reasoning_effort": "low",
                    "n": 1
                }

                # Add response format if JSON mode requested
                if json_mode:
                    api_params["response_format"] = {"type": "json_object"}

                # Make API call
                response = self.client.chat.completions.create(**api_params)

                # Extract response
                content = response.choices[0].message.content

                # Parse JSON if requested
                if json_mode:
                    try:
                        content = json.loads(content)
                    except json.JSONDecodeError as e:
                        return {
                            'success': False,
                            'error': f"Failed to parse JSON response: {str(e)}",
                            'raw_content': content
                        }

                return {
                    'success': True,
                    'content': content,
                    'model': response.model,
                    'usage': {
                        'prompt_tokens': response.usage.prompt_tokens,
                        'completion_tokens': response.usage.completion_tokens,
                        'total_tokens': response.usage.total_tokens
                    }
                }

            except Exception as e:
                if attempt < max_retries - 1:
                    # Wait before retry (exponential backoff)
                    time.sleep(2 ** attempt)
                    continue
                else:
                    return {
                        'success': False,
                        'error': str(e),
                        'error_type': type(e).__name__
                    }

        return {
            'success': False,
            'error': f"Failed after {max_retries} attempts"
        }

    def get_structured_completion(
        self,
        prompt: str,
        system_message: str,
        max_retries: int = 3
    ) -> Dict[str, Any]:
        """
        Get structured JSON completion

        Args:
            prompt: User prompt
            system_message: System message
            max_retries: Maximum retries

        Returns:
            Structured response dictionary
        """
        return self.get_completion(
            prompt=prompt,
            system_message=system_message,
            max_retries=max_retries,
            json_mode=True
        )