"""
OpenRouter AI client and prompt management
"""

import time
import json
from pathlib import Path
from typing import Optional, Dict, Any
from openai import OpenAI, RateLimitError, APIError, APIConnectionError, APITimeoutError
from src.core.config import get_config

AVAILABLE_MODELS = {
    "gpt-4o-mini": "openai/gpt-4o-mini",
    "claude-sonnet-3.5": "anthropic/claude-3.5-sonnet",
    "grok-4-fast": "x-ai/grok-4-fast"
}


class AIClient:
    """OpenRouter API client using OpenAI SDK"""
    
    def __init__(
        self, 
        api_key: str, 
        model: str, 
        base_url: str = "https://openrouter.ai/api/v1"
    ):
        self.client = OpenAI(
            api_key=api_key,
            base_url=base_url,
            default_headers={
                "HTTP-Referer": "https://github.com/yourusername/Big-Link-Man",
                "X-Title": "Big-Link-Man"
            }
        )
        
        if model in AVAILABLE_MODELS:
            self.model = AVAILABLE_MODELS[model]
        else:
            self.model = model
    
    def generate_completion(
        self, 
        prompt: str, 
        system_message: Optional[str] = None,
        max_tokens: int = 4000,
        temperature: float = 0.7,
        json_mode: bool = False,
        override_model: Optional[str] = None,
        title: Optional[str] = None
    ) -> str:
        """
        Generate completion from OpenRouter API
        
        Args:
            prompt: User prompt text
            system_message: Optional system message
            max_tokens: Maximum tokens to generate
            temperature: Sampling temperature (0-1)
            json_mode: If True, requests JSON response format
            override_model: If provided, use this model instead of self.model
        
        Returns:
            Tuple of (generated text completion, finish_reason)
        """
        messages = []
        if system_message:
            messages.append({"role": "system", "content": system_message})
        messages.append({"role": "user", "content": prompt})
        
        model_to_use = override_model if override_model else self.model
        
        kwargs: Dict[str, Any] = {
            "model": model_to_use,
            "messages": messages,
            "max_tokens": max_tokens,
            "temperature": temperature
        }
        
        if json_mode:
            kwargs["response_format"] = {"type": "json_object"}
        
        retries = 3
        wait_times = [10, 20]
        
        for attempt in range(retries):
            try:
                response = self.client.chat.completions.create(**kwargs)
                content = response.choices[0].message.content or ""
                finish_reason = response.choices[0].finish_reason
                
                if finish_reason != "stop":
                    title_str = title if title else "N/A"
                    print(f"{title_str} - {finish_reason} - {model_to_use}")
                
                if json_mode:
                    print(f"[DEBUG] AI Response (first 200 chars): {content[:200]}")
                return content, finish_reason
            
            except RateLimitError as e:
                if attempt < retries - 1:
                    wait_time = wait_times[attempt]
                    print(f"[API] Rate limit hit. Retrying in {wait_time}s... (attempt {attempt + 1}/{retries})")
                    time.sleep(wait_time)
                else:
                    print(f"[API] Rate limit exceeded after {retries} attempts")
                    raise
            
            except (APIConnectionError, APITimeoutError) as e:
                if attempt < retries - 1:
                    wait_time = wait_times[attempt]
                    print(f"[API] Connection/timeout error. Retrying in {wait_time}s... (attempt {attempt + 1}/{retries})")
                    time.sleep(wait_time)
                else:
                    print(f"[API] Connection failed after {retries} attempts")
                    raise
            
            except json.JSONDecodeError as e:
                if attempt < retries - 1:
                    wait_time = wait_times[attempt]
                    print(f"[API] Invalid JSON response (likely API error page). Retrying in {wait_time}s... (attempt {attempt + 1}/{retries})")
                    time.sleep(wait_time)
                else:
                    print(f"[API] Failed to get valid response after {retries} attempts")
                    raise
            
            except APIError as e:
                if attempt < retries - 1:
                    wait_time = wait_times[attempt]
                    print(f"[API] API error: {str(e)[:100]}. Retrying in {wait_time}s... (attempt {attempt + 1}/{retries})")
                    time.sleep(wait_time)
                else:
                    print(f"[API] API error after {retries} attempts: {str(e)[:200]}")
                    raise
            
            except Exception as e:
                print(f"[API] Unexpected error: {type(e).__name__}: {str(e)[:200]}")
                raise
        
        return ""


class PromptManager:
    """Manages loading and formatting of prompt templates"""
    
    def __init__(self, prompts_dir: str = "src/generation/prompts"):
        self.prompts_dir = Path(prompts_dir)
        self.prompts: Dict[str, dict] = {}
    
    def load_prompt(self, prompt_name: str) -> dict:
        """Load prompt from JSON file"""
        if prompt_name in self.prompts:
            return self.prompts[prompt_name]
        
        prompt_file = self.prompts_dir / f"{prompt_name}.json"
        if not prompt_file.exists():
            raise FileNotFoundError(f"Prompt file not found: {prompt_file}")
        
        with open(prompt_file, 'r', encoding='utf-8') as f:
            prompt_data = json.load(f)
        
        self.prompts[prompt_name] = prompt_data
        return prompt_data
    
    def format_prompt(self, prompt_name: str, **kwargs) -> tuple[str, str]:
        """
        Format prompt with variables
        
        Args:
            prompt_name: Name of the prompt template
            **kwargs: Variables to inject into the template
        
        Returns:
            Tuple of (system_message, user_prompt)
        """
        prompt_data = self.load_prompt(prompt_name)
        
        system_message = prompt_data.get("system_message", "")
        user_prompt = prompt_data.get("user_prompt", "")
        
        if system_message:
            system_message = system_message.format(**kwargs)
        
        user_prompt = user_prompt.format(**kwargs)
        
        return system_message, user_prompt