import subprocess
import sys
import torch
import base64
from io import BytesIO
from PIL import Image
import requests
from transformers import AutoModelForCausalLM, AutoProcessor
import os

def install(package):
    subprocess.check_call([sys.executable, "-m", "pip", "install", "--no-warn-script-location", package])

class EndpointHandler:
    def __init__(self, path=""):
        required_packages = ['timm', 'einops', 'flash-attn', 'Pillow','-U transformers']
        for package in required_packages:
            try:
                install(package)
                print(f"Successfully installed {package}")
            except Exception as e:
                print(f"Failed to install {package}: {str(e)}")
        
        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
        print(f"Using device: {self.device}")
        
        self.model_name = "arjunanand13/LADP_Florence-60e"
        self.model = AutoModelForCausalLM.from_pretrained(
            self.model_name,
            trust_remote_code=True,
        ).to(self.device)
        
        self.processor = AutoProcessor.from_pretrained(
            self.model_name,
            trust_remote_code=True,
        )
        
        if torch.cuda.is_available():
            torch.cuda.empty_cache()

    def process_image(self,image_data):
        print("[DEBUG] Attempting to process image")
        try:
            # Check if image_data is a file path
            if isinstance(image_data, str) and len(image_data) < 256 and os.path.exists(image_data):
                with open(image_data, 'rb') as image_file:
                    print("[DEBUG] File opened successfully")
                    image = Image.open(image_file)
            else:
                # Assume image_data is base64 encoded
                print("[DEBUG] Decoding base64 image data")
                image_bytes = base64.b64decode(image_data)
                image = Image.open(BytesIO(image_bytes))
            
            print("[DEBUG] Image opened with PIL:", image.format, image.size, image.mode)
            return image
        except Exception as e:
            print(f"[ERROR] Error processing image: {str(e)}")
            return None

    def __call__(self, data):
        try:
            # Extract inputs from the expected Hugging Face format
            inputs = data.pop("inputs", data)
            
            # Check if inputs is a dict or string
            if isinstance(inputs, dict):
                image_path = inputs.get("image", None)
                text_input = inputs.get("text", "")
            else:
                # If inputs is not a dict, assume it's the image path
                image_path = inputs
                text_input = "What is in this image?"
            print("[INFO]",image_path,text_input)
            # Process image
            image = self.process_image(image_path) if image_path else None
            print("[INFO]",image)
            # Prepare inputs for the model
            model_inputs = self.processor(
                images=image if image else None,
                text=text_input,
                return_tensors="pt"
            )
            
            # Move inputs to device
            model_inputs = {k: v.to(self.device) if isinstance(v, torch.Tensor) else v 
                           for k, v in model_inputs.items()}
            
            # Generate output
            with torch.no_grad():
                outputs = self.model.generate(**model_inputs)
            
            # Decode outputs
            decoded_outputs = self.processor.batch_decode(outputs, skip_special_tokens=True)
            print(f"[INFO],{decoded_outputs}")
            print(f"[INFO],{decoded_outputs[0]}")
            return {"generated_text": decoded_outputs[0]}
        
        except Exception as e:
            return {"error": str(e)}