"""
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 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 = "cloud", settings: Dict[str, Any] = 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}")
    
    async def generate(self, system_prompt: str, user_input: str, context: List[Dict]) -> str:
        """Generate response from Spark LLM"""
        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:
            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 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"
        }
        
        # Extract required fields from project config
        body = {
            "work_mode": self.provider_variant,
            "cloud_token": self.spark_token,
            "project_name": project_config.get("name"),
            "project_version": project_config.get("version_id"),
            "repo_id": project_config.get("repo_id"),
            "generation_config": project_config.get("generation_config", {}),
            "use_fine_tune": project_config.get("use_fine_tune", False),
            "fine_tune_zip": project_config.get("fine_tune_zip", "")
        }
        
        try:
            async with httpx.AsyncClient(timeout=10) as client:
                response = await client.post(
                    f"{self.spark_endpoint}/startup",
                    json=body,
                    headers=headers
                )
                
                if response.status_code >= 400:
                    log(f"❌ Spark startup failed: {response.status_code} - {response.text}")
                    return False
                
                log(f"✅ Spark acknowledged startup ({response.status_code})")
                return True
        except Exception as e:
            log(f"⚠️ Spark startup error: {e}")
            return False

class GPT4oLLM(LLMInterface):
    """OpenAI GPT integration"""
    
    def __init__(self, api_key: str, model: str = "gpt-4o-mini", settings: Dict[str, Any] = None):
        super().__init__(settings)
        self.api_key = api_key
        self.model = self._map_model_name(model)
        self.client = AsyncOpenAI(api_key=api_key)
        
        # Extract model-specific settings
        self.temperature = settings.get("temperature", 0.7) if settings else 0.7
        self.max_tokens = settings.get("max_tokens", 4096) if settings else 4096
        
        log(f"✅ Initialized GPT LLM with model: {self.model}")
    
    def _map_model_name(self, model: str) -> str:
        """Map provider name to actual model name"""
        mappings = {
            "gpt4o": "gpt-4",
            "gpt4o-mini": "gpt-4o-mini"
        }
        return mappings.get(model, model)
    
    async def generate(self, system_prompt: str, user_input: str, context: List[Dict]) -> str:
        """Generate response from OpenAI"""
        try:
            # Build messages
            messages = [{"role": "system", "content": system_prompt}]
            
            # Add context
            for msg in context:
                messages.append({
                    "role": msg.get("role", "user"),
                    "content": msg.get("content", "")
                })
            
            # Add current user input
            messages.append({"role": "user", "content": user_input})
            
            # Call OpenAI
            response = await self.client.chat.completions.create(
                model=self.model,
                messages=messages,
                temperature=self.temperature,
                max_tokens=self.max_tokens
            )
            
            return response.choices[0].message.content.strip()
        except Exception as e:
            log(f"❌ OpenAI error: {e}")
            raise
    
    async def startup(self, project_config: Dict) -> bool:
        """GPT doesn't need startup, always return True"""
        log("✅ GPT provider ready (no startup needed)")
        return True