import hashlib
import os
import subprocess
import sys

from pymongo import MongoClient


def _execute_exiftool(img_file: str) -> dict:
    res = subprocess.run(
        ['exiftool', img_file],
        capture_output=True,
        text=True,
    )

    exif_metadata = {}

    for line in res.stdout.splitlines():
        parts = line.split(':', 1)
        exif_metadata[parts[0].strip().lower().replace(' ', '_')] = parts[1].strip()

    return exif_metadata


if __name__ == '__main__':
    # Authenticate against MongoDB server
    mongo = MongoClient(os.environ['MONGO_URI'])
    database = mongo.exif_database
    collection = database.pictures

    picture_metadata = _execute_exiftool(sys.argv[1])

    # Append MongoDB identifier
    picture_metadata['_id'] = hashlib.sha256(sys.argv[1].encode('utf-8')).hexdigest()
    picture_metadata['path'] = sys.argv[1]

    # Insert into MongoDB
    collection.insert_one(picture_metadata)