"""
LLM Provider Interface for Flare
"""
import os
from abc import ABC, abstractmethod
from typing import Dict, List, Optional, Any
import httpx
from openai import AsyncOpenAI
from utils import log

class LLMInterface(ABC):
    """Abstract base class for LLM providers"""
    
    def __init__(self, settings: Dict[str, Any] = None):
        """Initialize with provider-specific settings"""
        self.settings = settings or {}
        self.internal_prompt = self.settings.get("internal_prompt", "")
        self.parameter_collection_config = self.settings.get("parameter_collection_config", {})
    
    @abstractmethod
    async def generate(self, system_prompt: str, user_input: str, context: List[Dict]) -> str:
        """Generate response from LLM"""
        pass
    
    @abstractmethod
    async def startup(self, project_config: Dict) -> bool:
        """Initialize LLM with project config"""
        pass

class SparkLLM(LLMInterface):
    """Spark LLM integration"""
    
    def __init__(self, spark_endpoint: str, spark_token: str, provider_variant: str = "spark", settings: Dict = None):
        super().__init__(settings)
        self.spark_endpoint = spark_endpoint.rstrip("/")
        self.spark_token = spark_token
        self.provider_variant = provider_variant
        log(f"🔌 SparkLLM initialized with endpoint: {self.spark_endpoint}, variant: {self.provider_variant}")
    
    async def generate(self, system_prompt: str, user_input: str, context: List[Dict]) -> str:
        """Generate response from Spark"""
        headers = {
            "Authorization": f"Bearer {self.spark_token}",
            "Content-Type": "application/json"
        }
        
        # Build payload
        payload = {
            "system_prompt": system_prompt,
            "user_input": user_input,
            "context": context
        }
        
        try:
            log(f"📤 Spark request to {self.spark_endpoint}/generate")
            async with httpx.AsyncClient(timeout=60) as client:
                response = await client.post(
                    f"{self.spark_endpoint}/generate",
                    json=payload,
                    headers=headers
                )
                response.raise_for_status()
                data = response.json()
                
                # Try different response fields
                raw = data.get("model_answer", "").strip()
                if not raw:
                    raw = (data.get("assistant") or data.get("text", "")).strip()
                
                return raw
        except httpx.TimeoutException:
            log("⏱️ Spark timeout")
            raise
        except Exception as e:
            log(f"❌ Spark error: {e}")
            raise
    
    async def startup(self, project_config: Dict) -> bool:
        """Send startup request to Spark"""
        headers = {
            "Authorization": f"Bearer {self.spark_token}",
            "Content-Type": "application/json"
        }
        
        try:
            log(f"🚀 Sending startup to Spark for project: {project_config.get('project_name')}")
            async with httpx.AsyncClient(timeout=30) as client:
                response = await client.post(
                    f"{self.spark_endpoint}/startup",
                    json=project_config,
                    headers=headers
                )
                response.raise_for_status()
                log("✅ Spark startup successful")
                return True
        except Exception as e:
            log(f"❌ Spark startup failed: {e}")
            return False

class GPT4oLLM(LLMInterface):
    """OpenAI GPT integration"""
    
    def __init__(self, api_key: str, model: str = "gpt-4o-mini", settings: Dict = None):
        super().__init__(settings)
        self.api_key = api_key
        self.model = model
        self.client = AsyncOpenAI(api_key=api_key)
        # Default GPT settings
        self.temperature = settings.get("temperature", 0.3) if settings else 0.3
        self.max_tokens = settings.get("max_tokens", 512) if settings else 512
        log(f"✅ Initialized GPT LLM with model: {model}")
    
    async def generate(self, system_prompt: str, user_input: str, context: List[Dict]) -> str:
        """Generate response from GPT"""
        try:
            # Convert context to OpenAI format
            messages = []
            
            # Add system prompt
            messages.append({"role": "system", "content": system_prompt})
            
            # Add conversation history
            for msg in context[-10:]:  # Last 10 messages
                role = "user" if msg["role"] == "user" else "assistant"
                messages.append({"role": role, "content": msg["content"]})
            
            # Add current user input
            messages.append({"role": "user", "content": user_input})
            
            log(f"📤 GPT request with {len(messages)} messages")
            
            # Call OpenAI API
            response = await self.client.chat.completions.create(
                model=self.model,
                messages=messages,
                temperature=self.temperature,
                max_tokens=self.max_tokens
            )
            
            content = response.choices[0].message.content
            log(f"✅ GPT response received: {len(content)} chars")
            
            return content
            
        except Exception as e:
            log(f"❌ GPT error: {e}")
            raise
    
    async def startup(self, project_config: Dict) -> bool:
        """GPT doesn't need startup - just validate API key"""
        try:
            # Test API key with a minimal request
            response = await self.client.chat.completions.create(
                model=self.model,
                messages=[{"role": "user", "content": "test"}],
                max_tokens=5
            )
            log("✅ GPT API key validated")
            return True
        except Exception as e:
            log(f"❌ GPT API key validation failed: {e}")
            return False