app.py

"""
app.py
Flask application — serves DICOM scans as PNG images.

Usage:
    python app.py
"""

from flask import Flask, send_file, abort
from services.dicom_service import dicom_to_png
from services.db_service import get_scan as db_get_scan
import os

app = Flask(__name__)


@app.route('/scan/<int:scan_uid>')
def get_scan(scan_uid):
    """Returns a DICOM scan converted to PNG."""
    scan = db_get_scan(scan_uid)
    if scan is None:
        abort(404, description=f"Scan {scan_uid} not found in database")
        return  # unreachable; abort() raises — helps type checkers narrow the type

    image_path = scan["images_file"]
    if not os.path.exists(image_path):
        abort(404, description=f"DICOM file not found on disk: {image_path}")
        return

    img_bytes = dicom_to_png(image_path)
    return send_file(img_bytes, mimetype='image/png')


if __name__ == "__main__":
    app.run(debug=True)