const bcrypt = require('bcryptjs');

class AuthService {
    constructor() {
        this.db = null;
    }

    setDatabase(database) {
        this.db = database;
        this.initUsers();
    }

    initUsers() {
        if (!this.db) return;
        const users = [
            {
                login: process.env.USER_1_LOGIN,
                password: process.env.USER_1_PASSWORD,
                name: process.env.USER_1_NAME,
                email: process.env.USER_1_EMAIL,
                role: process.env.USER_1_ROLE || 'admin'
            }
        ];
        for (const u of users) {
            if (u.login && u.password) {
                this.createUserIfNotExists(u);
            }
        }
    }

    async createUserIfNotExists(userData) {
        const row = this.db.prepare('SELECT id FROM users WHERE login = ?').get(userData.login);
        if (!row) {
            const hashedPassword = await bcrypt.hash(userData.password, 10);
            this.db.prepare(
                'INSERT INTO users (login, password, name, email, role, auth_type, created_at) VALUES (?, ?, ?, ?, ?, ?, datetime(\'now\'))'
            ).run(userData.login, hashedPassword, userData.name, userData.email || null, userData.role, 'local');
            console.log('Создан пользователь: ' + userData.name);
        }
    }

    authenticate(login, password) {
        const user = this.db.prepare("SELECT * FROM users WHERE login = ? AND auth_type = 'local'").get(login);
        if (!user) return null;
        const isValid = bcrypt.compareSync(password, user.password);
        if (isValid) {
            this.db.prepare("UPDATE users SET last_login = datetime('now') WHERE id = ?").run(user.id);
            const { password, ...userWithoutPassword } = user;
            return userWithoutPassword;
        }
        return null;
    }

    getUserById(id) {
        const user = this.db.prepare('SELECT id, login, name, email, role, auth_type, created_at, last_login FROM users WHERE id = ?').get(id);
        return user || null;
    }
}

const authService = new AuthService();
module.exports = authService;