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lib/history.js

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  1. // LEASH wallet-control — historical-activity profiles per customer.
  2. // Builds familiarity baselines from authorization_history.csv: which merchants and
  3. // devices the customer has actually used, and at which hours they normally buy.
  4. import { loadCsv, num, parseTs, round2 } from './util.js';
  6. export class HistoryProfiles {
  7. constructor(historyRows) {
  8. /** customer -> Map(merchant_id -> {name, approved, declined, lastTs, lastApprovedTs}) */
  9. this.merchants = new Map();
  10. /** customer -> Map(device_id -> {approved, lastTs}) */
  11. this.devices = new Map();
  12. /** customer -> Uint8Array(24) approved-purchase counts by hour-of-day */
  13. this.hours = new Map();
  14. /** customer -> total approved purchase count */
  15. this.purchaseCount = new Map();
  17. for (const r of historyRows) {
  18. const cust = r.customer_id;
  19. if (!cust) continue;
  20. const ts = parseTs(r.timestamp);
  21. const status = (r.status || '').toLowerCase();
  22. const approved = status === 'approved' || status === 'settled';
  23. const mid = r.merchant_id;
  24. if (mid) {
  25. if (!this.merchants.has(cust)) this.merchants.set(cust, new Map());
  26. const m = this.merchants.get(cust);
  27. if (!m.has(mid)) m.set(mid, { name: r.merchant_name || mid, approved: 0, declined: 0, lastTs: null, lastApprovedTs: null });
  28. const e = m.get(mid);
  29. if (r.merchant_name) e.name = r.merchant_name;
  30. if (status === 'declined') e.declined++;
  31. if (approved) { e.approved++; if (ts && (!e.lastApprovedTs || ts > e.lastApprovedTs)) e.lastApprovedTs = ts; }
  32. if (ts && (!e.lastTs || ts > e.lastTs)) e.lastTs = ts;
  33. }
  34. const dev = r.customer_device_id;
  35. if (dev) {
  36. if (!this.devices.has(cust)) this.devices.set(cust, new Map());
  37. const d = this.devices.get(cust);
  38. if (!d.has(dev)) d.set(dev, { approved: 0, lastTs: null });
  39. const e = d.get(dev);
  40. if (approved) e.approved++;
  41. if (ts && (!e.lastTs || ts > e.lastTs)) e.lastTs = ts;
  42. }
  43. if (approved && ts) {
  44. if (!this.hours.has(cust)) this.hours.set(cust, new Uint8Array(24));
  45. // saturating counter is fine: we only test "ever observed"
  46. const h = this.hours.get(cust);
  47. if (h[new Date(ts).getUTCHours()] < 255) h[new Date(ts).getUTCHours()]++;
  48. this.purchaseCount.set(cust, (this.purchaseCount.get(cust) || 0) + 1);
  49. }
  50. }
  51. }
  53. static load(path) {
  54. return new HistoryProfiles(loadCsv(path));
  55. }
  57. /** Has this customer bought at this merchant before (any approved purchase)? */
  58. merchantFamiliar(customerId, merchantId) {
  59. const e = this.merchants.get(customerId)?.get(merchantId);
  60. if (!e) return { familiar: false, approvedCount: 0, available: this.merchants.has(customerId) };
  61. return { available: true, familiar: e.approved > 0, approvedCount: e.approved, lastApprovedTs: e.lastApprovedTs, name: e.name };
  62. }
  64. /** All merchant names/ids this customer has approved purchases with (for lookalike checks). */
  65. knownMerchants(customerId) {
  66. const out = [];
  67. for (const [mid, e] of this.merchants.get(customerId) || []) {
  68. if (e.approved > 0) out.push({ merchantId: mid, name: e.name, approvedCount: e.approved });
  69. }
  70. return out;
  71. }
  73. deviceKnown(customerId, deviceId) {
  74. if (!deviceId) return { known: false, approvedCount: 0, available: false };
  75. const e = this.devices.get(customerId)?.get(deviceId);
  76. return { available: this.devices.has(customerId), known: !!e && (e.approved > 0 || !!e.lastTs), approvedCount: e?.approved || 0 };
  77. }
  79. /** Hour never observed in this customer's history AND outside a generous 07–23 envelope. */
  80. hourUnusual(customerId, ts) {
  81. const h = this.hours.get(customerId);
  82. const hour = new Date(ts).getUTCHours();
  83. const everSeen = h ? h[hour] > 0 : false;
  84. const envelope = hour >= 7 && hour <= 22;
  85. return { available: Boolean(h), unusual: Boolean(h) && !everSeen && !envelope, everSeen, hour };
  86. }
  87. }