#!/bin/python3
import os
import sys
import logging
import requests
import json
import argparse

from lib.diffie_hellman import decrypt

sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
from lib import digest

from subject import main

logging.basicConfig(format='%(levelname)s\t- %(message)s')
logger = logging.getLogger()
logger.setLevel(logging.INFO)

state = main(sys.argv)

BASE_DIR = os.path.join(os.path.expanduser('~'), '.sio/')

# session file - document name
def getDocMetadata(args):
    parser = argparse.ArgumentParser()


    parser.add_argument("-k", '--key', nargs=1, help="Path to the key file")
    parser.add_argument("-r", '--repo', nargs=1, help="Address:Port of the repository")
    parser.add_argument("-v", '--verbose', help="Increase verbosity", action="store_true")

    parser.add_argument('session', nargs='?', default=None)
    parser.add_argument('name', nargs='?', default=None)

    args = parser.parse_args()

    if not args.session or not args.name:
        logger.error("Need session file and document's name.")
        sys.exit(1)

    if (not os.path.isfile(BASE_DIR + args.session)):
        logger.error("File '" + args.session + "' not found.")
        sys.exit(1)

    # Get session file content
    with open(BASE_DIR + args.session, 'r') as f:
        args.session = json.load(f)

    doc_name = digest.get_hash(bytes(args.name, encoding='utf-8'))
    derived_key = bytes.fromhex(args.session['derived_key'])

    try:
        metadata = requests.get(f'http://{state['REP_ADDRESS']}/file/get/' + doc_name + '/metadata', headers={'Authorization': args.session['token']})
        metadata.raise_for_status()

    except requests.exceptions.HTTPError:
        logger.error("%d: %s", metadata.status_code, metadata.json()['error'])
        sys.exit(-1)

    except requests.exceptions.RequestException as errex: 
        logger.error("Failed to obtain response from server.")
        sys.exit(-1)

    if metadata.status_code == 200:
        try:
            response_data = json.loads(decrypt(bytes.fromhex(metadata.text), derived_key).decode('utf-8'))
        except Exception:
            logger.error("Failed to decrypt the content")
            sys.exit(1)
        sys.stdout.write(json.dumps(response_data, indent=4))
        sys.exit(0)
    else:
        logger.error("Failed to retrieve metadata")
        sys.exit(-1)


if __name__ == '__main__':
    getDocMetadata(sys.argv[1:])