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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 consistently sized text banner to the top of an image.
"""
image = Image.fromarray(image_array).convert("RGBA")
txt_overlay = Image.new("RGBA", image.size, (255, 255, 255, 0))
draw = ImageDraw.Draw(txt_overlay)
is_pneumonia = (text == "PNEUMONIA")
banner_color = (220, 53, 69, 215) if is_pneumonia else (25, 135, 84, 215)
text_color = (255, 255, 255)
# --- SIZING FIX: Banner is 1/7th of the image height ---
banner_height = int(image.height / 7)
# --- FONT FIX: Start large and shrink to fit ---
font_path = Path(__file__).parent / "Roboto-Bold.ttf"
font_size = int(banner_height * 0.75) # Start with a large font
text_to_draw = f"{text} | {confidence:.1%}"
# Shrink font until the text fits within 90% of the image width
while True:
try:
font = ImageFont.truetype(str(font_path), font_size)
text_width = font.getlength(text_to_draw)
if text_width < image.width * 0.9:
break
font_size -= 2
except IOError:
print(f"Font at '{font_path}' not found, using default.")
font = ImageFont.load_default()
break # Exit loop if font fails
# Draw banner
draw.rectangle([0, 0, image.width, banner_height], fill=banner_color)
# Center the text within the banner
text_height = font.getbbox(text_to_draw)[3]
text_x = (image.width - text_width) / 2
text_y = (banner_height - text_height) / 2
# Draw text
draw.text((text_x, text_y), text_to_draw, font=font, fill=text_color)
watermarked_image = Image.alpha_composite(image, txt_overlay)
return watermarked_image.convert("RGB")
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