feat(ADM-018): completed feature

project/src/modules/shipping/infrastructure/pg-shipping-repository.ts

@@ -0,0 +1,58 @@
+import type pg from 'pg';
+import type { ShippingRepository } from '../domain/ports.js';
+
+interface ZoneRow {
+  id: string;
+  postal_code_prefix: string | null;
+}
+interface MethodRow {
+  id: string;
+  name: string;
+  base_cost_cents: number;
+  free_shipping_threshold_cents: number | null;
+  active: boolean;
+}
+
+interface ZoneMatch {
+  zoneId: string;
+  methods: Array<{
+    id: string;
+    name: string;
+    baseCostCents: number;
+    freeShippingThresholdCents: number | null;
+    active: boolean;
+  }>;
+}
+
+export class PgShippingRepository implements ShippingRepository {
+  constructor(private readonly pool: pg.Pool) {}
+
+  async findMatchingZone(country: string, postalCode: string): Promise<ZoneMatch | undefined> {
+    const zones = await this.pool.query<ZoneRow>(
+      `SELECT id, postal_code_prefix FROM shipping_zones
+       WHERE country = $1 AND active = true
+         AND (postal_code_prefix IS NULL OR $2 LIKE postal_code_prefix || '%')
+       ORDER BY postal_code_prefix NULLS LAST`,
+      [country, postalCode],
+    );
+    if (zones.rows.length === 0) return undefined;
+    const best = zones.rows[0];
+    if (!best) return undefined;
+
+    const methods = await this.pool.query<MethodRow>(
+      `SELECT id, name, base_cost_cents, free_shipping_threshold_cents, active
+       FROM shipping_methods WHERE zone_id = $1`,
+      [best.id],
+    );
+    return {
+      zoneId: best.id,
+      methods: methods.rows.map((row) => ({
+        id: row.id,
+        name: row.name,
+        baseCostCents: row.base_cost_cents,
+        freeShippingThresholdCents: row.free_shipping_threshold_cents,
+        active: row.active,
+      })),
+    };
+  }
+}