R524809
72 lines
1.9 KiB
TypeScript
72 lines
1.9 KiB
TypeScript
export type ClockReadingTimeMode =
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| 'random'
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| 'whole-hour'
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| 'half-hour'
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| 'quarter-hour';
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export interface ClockProblem {
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hour: number;
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minute: number;
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}
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export interface ClockReadingData {
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problems: ClockProblem[];
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timeMode: ClockReadingTimeMode;
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}
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export const CLOCK_PROBLEM_COUNT = 12;
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const MINUTES_BY_MODE: Record<
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Exclude<ClockReadingTimeMode, 'random'>,
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readonly number[]
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> = {
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'whole-hour': [0],
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'half-hour': [30],
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'quarter-hour': [15, 45],
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};
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function pickMinute(timeMode: ClockReadingTimeMode): number {
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if (timeMode === 'random') {
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return Math.floor(Math.random() * 60);
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}
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const pool = MINUTES_BY_MODE[timeMode];
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return pool[Math.floor(Math.random() * pool.length)] ?? 0;
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}
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/** 生成一页 12 道钟表题，同一页内时刻不重复 */
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export function generateClockProblems(
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timeMode: ClockReadingTimeMode,
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): ClockProblem[] {
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const used = new Set<string>();
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const problems: ClockProblem[] = [];
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let guard = 0;
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while (problems.length < CLOCK_PROBLEM_COUNT && guard < 500) {
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guard += 1;
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const hour = Math.floor(Math.random() * 12) + 1;
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const minute = pickMinute(timeMode);
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const key = `${hour}:${minute}`;
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if (used.has(key)) continue;
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used.add(key);
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problems.push({ hour, minute });
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}
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return problems;
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}
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export function buildClockReadingData(
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timeMode: ClockReadingTimeMode,
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): ClockReadingData {
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return {
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timeMode,
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problems: generateClockProblems(timeMode),
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};
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}
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export const CLOCK_TIME_MODE_OPTIONS = [
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{ id: 'random' as const, label: '随机', subtitle: '0–59 分均可' },
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{ id: 'whole-hour' as const, label: '整点', subtitle: '如 3:00' },
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{ id: 'half-hour' as const, label: '半点', subtitle: '如 6:30' },
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{ id: 'quarter-hour' as const, label: '刻钟', subtitle: '如 2:15、7:45' },
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];
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