From a61457bc90d4f2552dc7824d62345c037bdac382 Mon Sep 17 00:00:00 2001
From: gnezim <gnezim@gmail.com>
Date: Fri, 17 Apr 2026 08:35:01 +0300
Subject: [PATCH] Port Angular CityCategoryService to feature-local
 cityCategory module

---
 src/features/flights-map/cityCategory.test.ts | 66 +++++++++++++++++++
 src/features/flights-map/cityCategory.ts      | 43 ++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 src/features/flights-map/cityCategory.test.ts
 create mode 100644 src/features/flights-map/cityCategory.ts

diff --git a/src/features/flights-map/cityCategory.test.ts b/src/features/flights-map/cityCategory.test.ts
new file mode 100644
index 00000000..8451a2be
--- /dev/null
+++ b/src/features/flights-map/cityCategory.test.ts
@@ -0,0 +1,66 @@
+import { describe, it, expect } from "vitest";
+import {
+  POPULATION_1KK,
+  POPULATION_500K,
+  POPULATION_100K,
+  POPULAR_RESORTS,
+  getCityZoomLevel,
+} from "./cityCategory.js";
+
+describe("cityCategory — set sizes", () => {
+  it("POPULATION_1KK has 30 entries (Angular parity)", () => {
+    expect(POPULATION_1KK.size).toBe(30);
+  });
+
+  it("POPULATION_500K has 23 entries", () => {
+    expect(POPULATION_500K.size).toBe(23);
+  });
+
+  it("POPULATION_100K has 39 entries", () => {
+    expect(POPULATION_100K.size).toBe(39);
+  });
+
+  it("POPULAR_RESORTS has 15 entries", () => {
+    expect(POPULAR_RESORTS.size).toBe(15);
+  });
+});
+
+describe("cityCategory — membership spot checks", () => {
+  it("MOW is in POPULATION_1KK", () => {
+    expect(POPULATION_1KK.has("MOW")).toBe(true);
+  });
+
+  it("DXB is in POPULAR_RESORTS", () => {
+    expect(POPULAR_RESORTS.has("DXB")).toBe(true);
+  });
+
+  it("TJM is in POPULATION_500K", () => {
+    expect(POPULATION_500K.has("TJM")).toBe(true);
+  });
+
+  it("MMK is in POPULATION_100K", () => {
+    expect(POPULATION_100K.has("MMK")).toBe(true);
+  });
+});
+
+describe("getCityZoomLevel", () => {
+  it("returns 2 for a 1kk-population city", () => {
+    expect(getCityZoomLevel("MOW")).toBe(2);
+  });
+
+  it("returns 2 for a popular resort", () => {
+    expect(getCityZoomLevel("DXB")).toBe(2);
+  });
+
+  it("returns 5 for a 500k-population city", () => {
+    expect(getCityZoomLevel("TJM")).toBe(5);
+  });
+
+  it("returns 6 for a 100k-population city", () => {
+    expect(getCityZoomLevel("MMK")).toBe(6);
+  });
+
+  it("returns 6 for an unknown city code", () => {
+    expect(getCityZoomLevel("XXX")).toBe(6);
+  });
+});
diff --git a/src/features/flights-map/cityCategory.ts b/src/features/flights-map/cityCategory.ts
new file mode 100644
index 00000000..6465beeb
--- /dev/null
+++ b/src/features/flights-map/cityCategory.ts
@@ -0,0 +1,43 @@
+/**
+ * City category data + zoom-level lookup.
+ *
+ * Direct port of Angular `CityCategoryService`. Cities are partitioned into
+ * four population/resort tiers; `getCityZoomLevel` maps a city code to the
+ * minimum map zoom at which its marker should render.
+ *
+ * Keep the Sets exported for regression tests — editing them should be an
+ * intentional product decision.
+ */
+
+export const POPULATION_1KK: ReadonlySet<string> = new Set([
+  "QIN", "THR", "FRU", "KZN", "LED", "IST", "HKG", "PEE", "UFA",
+  "OVB", "CEK", "CAI", "SVX", "EVN", "DEL", "MSQ",
+  "KJA", "KUF", "NQZ", "OMS", "ALA", "SHA", "VOG",
+  "BAK", "BKK", "BJS", "MOW", "GOJ", "VVO", "KHV",
+]);
+
+export const POPULATION_500K: ReadonlySet<string> = new Set([
+  "TJM", "TOF", "SKD", "ULY", "PEZ", "MCX", "KEJ",
+  "IJK", "REN", "ASF", "NOZ", "BAX", "RTW", "DOH",
+  "AUH", "SSH", "TAS", "CIT", "SGN", "CAN", "HRB",
+  "VRA", "KGF",
+]);
+
+export const POPULATION_100K: ReadonlySet<string> = new Set([
+  "MMK", "GDX", "SGC", "DYR", "ESL", "OSS", "KVD", "KVK", "GUW", "SCW",
+  "SCO", "NJC", "NBC", "UGC", "UUD", "YKS", "MJZ", "SKX", "STW", "KSN",
+  "KGD", "HMA", "HTA", "RGK", "GRV", "ABA", "PKC", "NAL", "MQF", "MRV",
+  "OSW", "ARH", "UUS", "NUX", "BHK", "PYJ", "CSY", "BQS", "DLM",
+]);
+
+export const POPULAR_RESORTS: ReadonlySet<string> = new Set([
+  "AER", "AYT", "BJV", "CMB", "DPS", "DXB", "GOI",
+  "HAV", "HKT", "HRG", "MLE", "NHA", "SEZ", "SYX", "IKT",
+]);
+
+export function getCityZoomLevel(code: string): number {
+  if (POPULATION_1KK.has(code) || POPULAR_RESORTS.has(code)) return 2;
+  if (POPULATION_500K.has(code)) return 5;
+  if (POPULATION_100K.has(code)) return 6;
+  return 6;
+}