/**
 * Agent API Pricing
 * 
 * USD cost per API call, stored in microdollars (integers).
 * 1 microdollar = $0.000001
 * 
 * Example: search-quotes costs $0.002 = 2,000 microdollars
 * 
 * These are starter values — tune based on actual cost-to-serve.
 */

const AGENT_PRICING_MICRO_USD = {
  'search-quotes':        4000,    // $0.002 per search (embedding + Pinecone)
  'search-quotes-3d':     10000,   // $0.01 per 3D search (embedding + UMAP)
  'make-clip':            50000,   // $0.05 per clip (video processing)
  'jamie-assist':         20000,   // $0.02 per assist (LLM call)
  'ai-analyze':           20000,   // $0.02 per analysis (LLM call)
  'submit-on-demand-run': 450000,  // $0.45 per on-demand run (heavy processing)
  'discover-podcasts':    5000,    // $0.005 per discovery (LLM extraction + Podcast Index search)
  'chapter-search':       8000,    // $0.008 per chapter search (keyword match across ~70K chapters + episode enrichment)
  'pull':                 100000   // $0.10 per pull (LLM-orchestrated corpus query)
};

// Deposit limits (in sats)
const AGENT_MIN_DEPOSIT_SATS = 10;        // 10 sats minimum
const AGENT_MAX_DEPOSIT_SATS = 500000;    // 500,000 sats maximum

// Default amount for inline 402 challenges on protected endpoints
const DEFAULT_CREDIT_PURCHASE_SATS = parseInt(process.env.DEFAULT_CREDIT_PURCHASE_SATS) || 1000;

// Safety buffer applied when auto-sizing per-endpoint default invoices.
// Absorbs BTC price drift between the cached rate used for sizing (up to ~60 min old)
// and the time the user actually pays. 1.02 = 2% extra headroom.
const AGENT_DEFAULT_SATS_BUFFER = 1.02;

/**
 * Get the microdollar cost for a given entitlement type.
 * Returns null if the entitlement type has no agent pricing (not billable).
 * 
 * @param {string} entitlementType
 * @returns {number|null} cost in microdollars, or null if not priced
 */
function getAgentCostMicroUsd(entitlementType) {
  return AGENT_PRICING_MICRO_USD[entitlementType] ?? null;
}

/**
 * Compute a right-sized default 402 invoice amount (in sats) for a priced
 * endpoint, covering exactly one call plus ~2% safety headroom (AGENT_DEFAULT_SATS_BUFFER).
 *
 * Returns null when the endpoint is not priced or no BTC rate is available
 * (caller should fall back to DEFAULT_CREDIT_PURCHASE_SATS).
 *
 * @param {string} entitlementType - e.g. 'pull', 'search-quotes'
 * @param {number} btcUsdRate - current BTC/USD rate
 * @returns {number|null} default sats (integer), or null if not sizable
 */
function computeDefaultSatsForEndpoint(entitlementType, btcUsdRate) {
  const costMicroUsd = getAgentCostMicroUsd(entitlementType);
  if (!costMicroUsd || !btcUsdRate || btcUsdRate <= 0) return null;
  const costUsd = costMicroUsd / 1_000_000;
  const satsPerUsd = 100_000_000 / btcUsdRate;
  const raw = costUsd * satsPerUsd * AGENT_DEFAULT_SATS_BUFFER;
  return Math.max(AGENT_MIN_DEPOSIT_SATS, Math.ceil(raw));
}

module.exports = {
  AGENT_PRICING_MICRO_USD,
  AGENT_MIN_DEPOSIT_SATS,
  AGENT_MAX_DEPOSIT_SATS,
  DEFAULT_CREDIT_PURCHASE_SATS,
  AGENT_DEFAULT_SATS_BUFFER,
  getAgentCostMicroUsd,
  computeDefaultSatsForEndpoint
};