IOS小组件/文案

client/src/features/suixinTheme/index.ts

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+import type { SuixinBaseThemeId, SuixinThemeStateV1, UserProfileScoring } from '@/src/storage/appStorage';
+
+import { getThemeTriplet, NEUTRAL_THEME_COLORS } from './palette';
+import { lerpHex } from './colorMath';
+import { computeTFromStep } from './progress';
+import { pickSuixinBaseThemeId } from './pickTheme';
+
+export { NEUTRAL_THEME_COLORS } from './palette';
+export { pickSuixinBaseThemeId } from './pickTheme';
+
+/**
+ * 根据 base theme 与 step 计算当前背景纯色
+ */
+export function computeSuixinSolidColor(args: {
+  baseThemeId: SuixinBaseThemeId;
+  stepIndex: number;
+  seed: string;
+}): string {
+  const [top, _mid, bottom] = getThemeTriplet(args.baseThemeId);
+  const t = computeTFromStep({ stepIndex: args.stepIndex, segments: 12, seed: args.seed });
+  return lerpHex(top, bottom, t, NEUTRAL_THEME_COLORS[1]);
+}
+
+/**
+ * 初始化一份随心状态（在冷启动会话内锁定 base theme）
+ */
+export function buildInitialSuixinState(args: {
+  bootId: string;
+  profile: UserProfileScoring | null;
+  now?: Date;
+}): SuixinThemeStateV1 {
+  const now = args.now ?? new Date();
+  const baseThemeId = pickSuixinBaseThemeId(args.profile);
+  const seed = args.bootId;
+  const step_index = 0;
+  const last_color = computeSuixinSolidColor({ baseThemeId, stepIndex: step_index, seed });
+  return {
+    schema_version: 1,
+    saved_at: now.toISOString(),
+    boot_id: args.bootId,
+    base_theme_id: baseThemeId,
+    seed,
+    step_index,
+    last_color,
+  };
+}
+
+/**
+ * 切换文案时推进一步（不跨主题）
+ */
+export function advanceSuixinState(prev: SuixinThemeStateV1, now?: Date): SuixinThemeStateV1 {
+  const nextStep = (Number.isFinite(prev.step_index) ? prev.step_index : 0) + 1;
+  const last_color = computeSuixinSolidColor({
+    baseThemeId: prev.base_theme_id,
+    stepIndex: nextStep,
+    seed: prev.seed,
+  });
+  return {
+    ...prev,
+    saved_at: (now ?? new Date()).toISOString(),
+    step_index: nextStep,
+    last_color,
+  };
+}
+