import os
import tempfile
import shutil
import logging

from flask import Flask, request, send_from_directory, jsonify
from werkzeug.utils import secure_filename
from ankiai import images_to_package
from constants import IMAGE_KEY, APKG_FILE, NO_IMAGE_PART_ERROR, NO_SELECTED_FILE_ERROR, INVALID_FILENAME_ERROR


from logging_config import setup_logging
setup_logging()


app = Flask(__name__)

def save_uploaded_images(images, directory):
    for img in images:
        safe_filename = secure_filename(img.filename)
        if not safe_filename:
            raise ValueError(INVALID_FILENAME_ERROR)

        filename = os.path.join(directory, safe_filename)
        img.save(filename)


@app.route('/deck-from-images', methods=['POST'])
def deck_from_images():
    if IMAGE_KEY not in request.files:
        return jsonify({'error': NO_IMAGE_PART_ERROR}), 400

    images = request.files.getlist(IMAGE_KEY)

    if not images or not any(img.filename != '' for img in images):
        return jsonify({'error': NO_SELECTED_FILE_ERROR}), 400

    temp_dir = tempfile.mkdtemp()

    save_uploaded_images(images, temp_dir)

    try:
        images_to_package(temp_dir).write_to_file(APKG_FILE)
        logging.info(f"Anki package written to {APKG_FILE}")
        return send_from_directory('.', APKG_FILE, as_attachment=True)
    except Exception as e:
        logging.error("Exception occurred: "+str(e), exc_info=True)
        return jsonify({'error': str(e)}), 500
    finally:
        shutil.rmtree(temp_dir)


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