/**
 * Strip PII from monitoring endpoints for unauthenticated visitors.
 */

export function maskEmail(email) {
    const [local, domain] = String(email || '').split('@');
    if (!local || !domain) {
        return 'account';
    }
    if (local.length <= 4) {
        return `${local[0]}***@${domain}`;
    }
    return `${local.slice(0, 2)}******${local.slice(-2)}@${domain}`;
}

function sanitizeSubscription(subscription) {
    if (!subscription || typeof subscription !== 'object') {
        return undefined;
    }
    return {
        tier: subscription.tier || 'unknown'
    };
}

function sanitizeModelQuotas(models) {
    if (!models || typeof models !== 'object') {
        return {};
    }

    const sanitized = {};
    for (const [modelId, info] of Object.entries(models)) {
        sanitized[modelId] = {
            remaining: info?.remaining ?? null,
            remainingFraction: info?.remainingFraction ?? null,
            resetTime: info?.resetTime ?? null
        };
    }
    return sanitized;
}

export function sanitizeHealthAccount(account, index) {
    return {
        id: `account-${index + 1}`,
        email: maskEmail(account?.email),
        status: account?.status || 'unknown',
        modelRateLimits: {},
        rateLimitCooldownRemaining: account?.rateLimitCooldownRemaining ?? 0,
        models: sanitizeModelQuotas(account?.models),
        ...(account?.error ? { error: 'Unavailable' } : {})
    };
}

export function sanitizeHealthPayload(payload) {
    return {
        status: payload?.status,
        timestamp: payload?.timestamp,
        latencyMs: payload?.latencyMs,
        summary: payload?.summary,
        counts: payload?.counts,
        accounts: (payload?.accounts || []).map(sanitizeHealthAccount)
    };
}

export function sanitizeAccountLimitsAccount(account, index) {
    return {
        id: `account-${index + 1}`,
        email: maskEmail(account?.email),
        status: account?.status || 'unknown',
        error: account?.error ? 'Unavailable' : null,
        source: account?.source || 'unknown',
        enabled: account?.enabled !== false,
        isInvalid: Boolean(account?.isInvalid),
        subscription: sanitizeSubscription(account?.subscription),
        limits: sanitizeModelQuotas(account?.limits || account?.models),
        models: sanitizeModelQuotas(account?.models)
    };
}

export function sanitizeAccountLimitsPayload(payload) {
    return {
        timestamp: payload?.timestamp,
        totalAccounts: payload?.totalAccounts,
        models: payload?.models || [],
        modelConfig: {},
        globalQuotaThreshold: payload?.globalQuotaThreshold ?? 0,
        accounts: (payload?.accounts || []).map(sanitizeAccountLimitsAccount)
    };
}