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