import easyocr
import numpy as np
import cv2
import re

reader = easyocr.Reader(['en'], gpu=False)

def extract_weight_from_image(pil_img):
    try:
        img = np.array(pil_img)

        # Preprocessing for OCR
        gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
        gray = cv2.resize(gray, None, fx=2, fy=2, interpolation=cv2.INTER_LINEAR)
        gray = cv2.equalizeHist(gray)
        gray = cv2.GaussianBlur(gray, (3, 3), 0)
        inverted = cv2.bitwise_not(gray)

        # OCR read
        result = reader.readtext(inverted, detail=0)
        combined_text = " ".join(result)
        print("OCR Raw Text:", combined_text)

        # First try matching with "kg"
        match = re.search(r"(\d{1,4}(?:\.\d{1,2})?)\s*(kg|KG|Kg)", combined_text)
        if match:
            return f"{match.group(1)} kg", 95.0

        # Then try fallback match: only numbers
        fallback = re.search(r"\d{1,4}(?:\.\d{1,2})?", combined_text)
        if fallback:
            return f"{fallback.group(0)} kg", 75.0

        return "No weight detected kg", 0.0

    except Exception as e:
        return f"Error: {str(e)}", 0.0