refactor

lib/editor/session/useTimelineState.ts

@@ -0,0 +1,45 @@
+import { useState } from "react";
+import type { TimelineRange } from "@/lib/editor/session/sessionTypes";
+
+type Options = {
+    currentYear: number;
+    fallbackTimelineRange: TimelineRange;
+};
+
+export function useTimelineState(options: Options) {
+    const [timelineYear, setTimelineYear] = useState<number>(() =>
+        clampYearValue(
+            options.currentYear,
+            options.fallbackTimelineRange.min,
+            options.fallbackTimelineRange.max
+        )
+    );
+    const [timelineDraftYear, setTimelineDraftYear] = useState<number>(() =>
+        clampYearValue(
+            options.currentYear,
+            options.fallbackTimelineRange.min,
+            options.fallbackTimelineRange.max
+        )
+    );
+    const [isTimelineLoading, setIsTimelineLoading] = useState(false);
+    const [timelineStatus, setTimelineStatus] = useState<string | null>(null);
+
+    return {
+        timelineYear,
+        setTimelineYear,
+        timelineDraftYear,
+        setTimelineDraftYear,
+        isTimelineLoading,
+        setIsTimelineLoading,
+        timelineStatus,
+        setTimelineStatus,
+    };
+}
+
+function clampYearValue(year: number, minYear: number, maxYear: number): number {
+    const lower = Math.min(minYear, maxYear);
+    const upper = Math.max(minYear, maxYear);
+    if (year < lower) return lower;
+    if (year > upper) return upper;
+    return year;
+}