feat: create routes to load popular titles

src/libs/getCurrentAndNextSeason.spec.ts

@@ -0,0 +1,69 @@
+import { DateTime } from "luxon";
+
+import { describe, expect, it } from "bun:test";
+
+import { getCurrentAndNextSeason } from "./getCurrentAndNextSeason";
+
+describe("getCurrentAndNextSeason", () => {
+  it("now is current year, next is current year", () => {
+    const now = DateTime.local(2023, 4, 1) as DateTime<true>;
+
+    const { current, next } = getCurrentAndNextSeason(now);
+
+    expect(current.year).toEqual(2023);
+    expect(next.year).toEqual(2023);
+  });
+
+  it("now is current year, next is next year", () => {
+    const now = DateTime.local(2023, 11, 1) as DateTime<true>;
+
+    const { current, next } = getCurrentAndNextSeason(now);
+
+    expect(current.year).toEqual(2023);
+    expect(next.year).toEqual(2024);
+  });
+
+  it("months 1 - 3 are currently winter, next is spring", () => {
+    [1, 2, 3].forEach((month) => {
+      const now = DateTime.local(2023, month, 1) as DateTime<true>;
+
+      const { current, next } = getCurrentAndNextSeason(now);
+
+      expect(current.season).toEqual("WINTER");
+      expect(next.season).toEqual("SPRING");
+    });
+  });
+
+  it("months 4 - 6 are currently spring, next is summer", () => {
+    [4, 5, 6].forEach((month) => {
+      const now = DateTime.local(2023, month, 1) as DateTime<true>;
+
+      const { current, next } = getCurrentAndNextSeason(now);
+
+      expect(current.season).toEqual("SPRING");
+      expect(next.season).toEqual("SUMMER");
+    });
+  });
+
+  it("months 7 - 9 are currently summer, next is fall", () => {
+    [7, 8, 9].forEach((month) => {
+      const now = DateTime.local(2023, month, 1) as DateTime<true>;
+
+      const { current, next } = getCurrentAndNextSeason(now);
+
+      expect(current.season).toEqual("SUMMER");
+      expect(next.season).toEqual("FALL");
+    });
+  });
+
+  it("months 10 - 12 are currently fall, next is winter", () => {
+    [10, 11, 12].forEach((month) => {
+      const now = DateTime.local(2023, month, 1) as DateTime<true>;
+
+      const { current, next } = getCurrentAndNextSeason(now);
+
+      expect(current.season).toEqual("FALL");
+      expect(next.season).toEqual("WINTER");
+    });
+  });
+});

src/libs/getCurrentAndNextSeason.ts

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+import { DateTime } from "luxon";
+
+type Season = "WINTER" | "SPRING" | "SUMMER" | "FALL";
+
+interface SeasonInfo {
+  season: Season;
+  year: number;
+}
+
+export function getCurrentAndNextSeason(now = DateTime.now()): {
+  current: SeasonInfo;
+  next: SeasonInfo;
+} {
+  const seasons = ["WINTER", "SPRING", "SUMMER", "FALL"] as const;
+  const seasonStartingMonth = [1, 4, 7, 10];
+  const currentSeasonIndex = seasonStartingMonth.findLastIndex(
+    (month) => now.month >= month,
+  );
+  const nextSeasonIndex = currentSeasonIndex + 1;
+
+  const currentSeason = seasons[currentSeasonIndex];
+  const nextSeason = seasons[nextSeasonIndex % seasons.length];
+  const nextYear = nextSeasonIndex === seasons.length ? now.year + 1 : now.year;
+
+  return {
+    current: {
+      season: currentSeason,
+      year: now.year,
+    },
+    next: {
+      season: nextSeason,
+      year: nextYear,
+    },
+  };
+}