@juspay/neurolink/dist/proxy/routingPolicy.js

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export function inferClaudeProxyModelTier(modelName) {
    const normalized = modelName.toLowerCase();
    if (normalized.includes("opus")) {
        return "opus";
    }
    if (normalized.includes("sonnet")) {
        return "sonnet";
    }
    if (normalized.includes("haiku")) {
        return "haiku";
    }
    return "other";
}
/**
 * Build a translation plan for a Claude-compatible proxy request.
 * The plan lists the primary provider followed by eligible fallback targets.
 * All configured fallback entries are always eligible — no contract-based gating.
 * When no fallback chain is configured, an "auto-provider" entry is appended.
 */
export function buildProxyTranslationPlan(primary, fallbackChain, requestedModel, _parsed) {
    const attempts = [
        {
            provider: primary.provider,
            model: primary.model,
            label: `${primary.provider}/${primary.model ?? "unknown"}`,
        },
    ];
    for (const fallback of fallbackChain) {
        if (fallback.provider === primary.provider &&
            fallback.model === primary.model) {
            continue;
        }
        attempts.push({
            provider: fallback.provider,
            model: fallback.model,
            label: `${fallback.provider}/${fallback.model}`,
        });
    }
    // Append auto-provider when no configured fallback chain exists,
    // or when all configured entries were deduped (same as primary).
    if (fallbackChain.length === 0 || attempts.length === 1) {
        attempts.push({ label: "auto-provider" });
    }
    return {
        requestedModel,
        modelTier: inferClaudeProxyModelTier(requestedModel),
        attempts,
        skipped: [],
    };
}
// ---------------------------------------------------------------------------
// Retry-after parsing helper
// ---------------------------------------------------------------------------
/**
 * Parse the retry-after header from an upstream 429 response.
 * Returns milliseconds to wait, or 0 if no valid header present.
 */
export function parseRetryAfterMs(retryAfterHeader) {
    if (!retryAfterHeader) {
        return 0;
    }
    const seconds = parseInt(retryAfterHeader, 10);
    if (!Number.isNaN(seconds)) {
        return Math.max(1, seconds) * 1000;
    }
    const date = new Date(retryAfterHeader);
    if (!Number.isNaN(date.getTime())) {
        return Math.max(1000, date.getTime() - Date.now());
    }
    return 0;
}