A/B Testing

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class ABTestingService {
    constructor(config) {
        this.experiments = new Map();
        this.initialize(config);
    }

    initialize(config) {
        config.experiments.forEach(exp => {
            this.experiments.set(exp.name, {
                variants: exp.variants,
                traffic_allocation: exp.traffic_allocation,
                metrics: exp.metrics,
                start_date: new Date(exp.start_date),
                end_date: new Date(exp.end_date)
            });
        });
    }

    assignVariant(userId, experimentName) {
        const experiment = this.experiments.get(experimentName);
        if (!experiment) return null;

        // 해시 기반 사용자 할당
        const hash = this.hashString(userId + experimentName);
        const normalizedHash = hash % 100;
        
        let accumulator = 0;
        for (const [variant, allocation] of Object.entries(experiment.traffic_allocation)) {
            accumulator += allocation;
            if (normalizedHash < accumulator) {
                return variant;
            }
        }
    }

    trackMetric(experimentName, userId, metricName, value) {
        // 지표 추적 및 저장
        const variant = this.assignVariant(userId, experimentName);
        if (!variant) return;

        this.storeMetric({
            experiment: experimentName,
            variant: variant,
            user: userId,
            metric: metricName,
            value: value,
            timestamp: new Date()
        });
    }
}