import json
import os
import hashlib

DATA_FILE = os.path.join(os.path.dirname(__file__), 'users.json')


def load_data():
    if not os.path.exists(DATA_FILE):
        return {}
    try:
        with open(DATA_FILE, 'r', encoding='utf-8') as f:
            return json.load(f)
    except Exception:
        return {}


def save_data(data):
    with open(DATA_FILE, 'w', encoding='utf-8') as f:
        json.dump(data, f, ensure_ascii=False, indent=4)


def hash_password(password):
    return hashlib.sha256(password.encode('utf-8')).hexdigest()


def register_user(login, password):
    data = load_data()
    if login in data:
        return False, 'Такой пользователь уже существует'
    data[login] = {
        'password': hash_password(password),
        'repositories': []
    }
    save_data(data)
    return True, 'Профиль создан'


def check_user(login, password):
    data = load_data()
    return login in data and data[login].get('password') == hash_password(password)


def get_repositories(login):
    data = load_data()
    return data.get(login, {}).get('repositories', [])


def add_repository(login, repo_link):
    data = load_data()
    if login not in data:
        return False
    repos = data[login].setdefault('repositories', [])
    if repo_link in repos:
        return False
    repos.append(repo_link)
    save_data(data)
    return True


def delete_repository(login, repo_link):
    data = load_data()
    if login in data and repo_link in data[login].get('repositories', []):
        data[login]['repositories'].remove(repo_link)
        save_data(data)