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# app/image_utils.py
from PIL import Image, ImageDraw, ImageFont
import numpy as np
from pathlib import Path
def add_watermark(image_array: np.ndarray, text: str, confidence: float) -> Image.Image:
"""
Adds a large, prominent, and professional-looking text banner to the top of an image.
"""
image = Image.fromarray(image_array).convert("RGBA")
# Create a transparent overlay layer
txt_overlay = Image.new("RGBA", image.size, (255, 255, 255, 0))
draw = ImageDraw.Draw(txt_overlay)
# --- DEFINE BANNER AND TEXT PROPERTIES ---
is_pneumonia = (text == "PNEUMONIA")
banner_color = (220, 53, 69, 210) if is_pneumonia else (25, 135, 84, 210) # Red/Green
text_color = (255, 255, 255)
# --- SIZING FIX: Banner height is 1/8th of the image height ---
banner_height = int(image.height / 8)
# --- FONT FIX: Use a bundled font and scale it to fit the banner ---
font_path = Path(__file__).parent / "Roboto-Bold.ttf"
try:
# Start with a font size that's a good proportion of the banner height
font_size = int(banner_height * 0.6)
font = ImageFont.truetype(str(font_path), font_size)
except IOError:
print(f"Font at '{font_path}' not found, using default.")
font = ImageFont.load_default()
# Text to draw
text_to_draw = f"{text} | Confidence: {confidence:.1%}"
# --- DRAW THE BANNER ---
draw.rectangle([0, 0, image.width, banner_height], fill=banner_color)
# --- POSITIONING: Center the text within the banner ---
try:
# getbbox is the modern, accurate way to measure text
_, top, _, bottom = draw.textbbox((0, 0), text_to_draw, font=font)
text_w = font.getlength(text_to_draw)
text_h = bottom - top
except Exception:
# Fallback for older Pillow
text_w = font.getsize(text_to_draw)[0]
text_h = font.getsize(text_to_draw)[1]
text_x = (image.width - text_w) / 2
text_y = (banner_height - text_h) / 2
# Draw text
draw.text((text_x, text_y), text_to_draw, font=font, fill=text_color)
# Composite the overlay onto the original image
watermarked_image = Image.alpha_composite(image, txt_overlay)
return watermarked_image.convert("RGB")
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