class SessionManager {
    constructor(provider) {
        this.sessions = provider.sessions;
    }

    // 获取所有可用会话
    getAvailableSessions() {
        return Object.keys(this.sessions).filter(username => this.sessions[username].valid);
    }

    // 随机选择会话
    getRandomSession() {
        const availableSessions = this.getAvailableSessions();
        if (availableSessions.length === 0) {
            throw new Error('没有可用的会话');
        }
        const randomIndex = Math.floor(Math.random() * availableSessions.length);
        return availableSessions[randomIndex];
    }

    // 策略
    getSessionByStrategy(strategy = 'random') {
        if (strategy === 'random') {
            return this.getRandomSession();
        }
        throw new Error(`未实现的策略: ${strategy}`);
    }
}

export default SessionManager;