import requests
import os
import re

from typing import List
from utils import encode_image
from PIL import Image
from google import genai
import torch
import subprocess
import psutil
import torch
from transformers import AutoModel, AutoTokenizer
from google import genai


class Rag:
    
    def _clean_raw_token_response(self, response_text):
        """
        Clean raw token responses that contain undecoded token IDs
        This handles cases where models return raw tokens instead of decoded text
        """
        if not response_text:
            return response_text
            
        # Check if response contains raw token patterns
        token_patterns = [
            r'<unused\d+>',  # unused tokens
            r'<bos>',        # beginning of sequence
            r'<eos>',        # end of sequence
            r'<unk>',        # unknown tokens
            r'<mask>',       # mask tokens
            r'<pad>',        # padding tokens
            r'\[multimodal\]', # multimodal tokens
        ]
        
        # If response contains raw tokens, try to clean them
        has_raw_tokens = any(re.search(pattern, response_text) for pattern in token_patterns)
        
        if has_raw_tokens:
            print("⚠️  Detected raw token response, attempting to clean...")
            
            # Remove common raw token patterns
            cleaned_text = response_text
            
            # Remove unused tokens
            cleaned_text = re.sub(r'<unused\d+>', '', cleaned_text)
            
            # Remove special tokens
            cleaned_text = re.sub(r'<(bos|eos|unk|mask|pad)>', '', cleaned_text)
            
            # Remove multimodal tokens
            cleaned_text = re.sub(r'\[multimodal\]', '', cleaned_text)
            
            # Clean up extra whitespace
            cleaned_text = re.sub(r'\s+', ' ', cleaned_text).strip()
            
            # If we still have mostly tokens, return an error message
            if len(cleaned_text.strip()) < 10:
                return "❌ **Model Response Error**: The model returned raw token IDs instead of decoded text. This may be due to model configuration issues. Please try:\n\n1. Restarting the Ollama server\n2. Using a different model\n3. Checking model compatibility with multimodal inputs"
            
            return cleaned_text
        
        return response_text
    
    def get_answer_from_gemini(self, query: str, image_paths: List[str]) -> str:
        print(f"Querying Gemini 2.5 Pro for query={query}, image_paths={image_paths}")
        try:
            # Use environment variable GEMINI_API_KEY
            api_key = os.environ.get('GEMINI_API_KEY')
            if not api_key:
                return "Error: GEMINI_API_KEY is not set."

            genai.configure(api_key=api_key)
            model = genai.GenerativeModel('gemini-2.5-pro')

            # Load images
            images = []
            for p in image_paths:
                try:
                    images.append(Image.open(p))
                except Exception:
                    pass

            chat_session = model.start_chat()
            response = chat_session.send_message([*images, query])
            return response.text
        except Exception as e:
            print(f"Gemini error: {e}")
            return f"Error: {str(e)}"
    
    #os.environ['OPENAI_API_KEY'] = "for the love of Jesus let this work"
    
    def get_answer_from_openai(self, query, imagesPaths):
        #import environ variables from .env
        import dotenv

        # Load the .env file
        dotenv_file = dotenv.find_dotenv()
        dotenv.load_dotenv(dotenv_file)
        
        # This function formerly used Ollama. Replace with Gemini 2.5 Pro.
        print(f"Querying Gemini (replacement for Ollama) for query={query}, imagesPaths={imagesPaths}")
        try:
            enhanced_query = f"Use all {len(imagesPaths)} pages to answer comprehensively.\n\nQuery: {query}"
            return self.get_answer_from_gemini(enhanced_query, imagesPaths)
        except Exception as e:
            print(f"Gemini replacement error: {e}")
            return None
        


    def __get_openai_api_payload(self, query:str, imagesPaths:List[str]):
        image_payload = []

        for imagePath in imagesPaths:
            base64_image = encode_image(imagePath)
            image_payload.append({
                "type": "image_url",
                "image_url": {
                    "url": f"data:image/jpeg;base64,{base64_image}"
                }
            })

        payload = {
            "model": "Llama3.2-vision", #change model here as needed
            "messages": [
                {
                    "role": "user",
                    "content": [
                        {
                            "type": "text",
                            "text": query
                        },
                        *image_payload
                    ]
                }
            ],
            "max_tokens": 1024 #reduce token size to reduce processing time
        }

        return payload
    


# if __name__ == "__main__":
#     rag = Rag()
    
#     query = "Based on attached images, how many new cases were reported during second wave peak"
#     imagesPaths = ["covid_slides_page_8.png", "covid_slides_page_8.png"]
    
#     rag.get_answer_from_gemini(query, imagesPaths)