40 lines
1.5 KiB
TypeScript
40 lines
1.5 KiB
TypeScript
import { SONG_DURATION_MAX_SECONDS, SONG_DURATION_MIN_SECONDS } from '../config/constants.ts'
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/** 时长差异容差（秒），差异不超过此值视为一致 */
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export const DURATION_TOLERANCE_SECONDS = 5
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export type SongDurationOutcome = 'keep' | 'clear' | 'fill' | 'nocheck'
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export interface SongDurationDecision {
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outcome: SongDurationOutcome
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durationSeconds: number | null
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}
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/** 归一化已有时长：非法值或越出合法区间视为无时长 */
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export function normalizeStoredDuration(value: unknown): number | null {
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if (value === null || value === undefined || value === '') return null
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const parsed = Number(value)
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if (!Number.isFinite(parsed)) return null
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const seconds = Math.floor(parsed)
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if (seconds < SONG_DURATION_MIN_SECONDS || seconds > SONG_DURATION_MAX_SECONDS) return null
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return seconds
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}
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/** 时长决策：库中无值且平台可查则补齐，有值但与平台不符则清空 */
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export function decideDurationOutcome(
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storedDurationSeconds: number | null,
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actualDurationSeconds: number | null,
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toleranceSeconds: number = DURATION_TOLERANCE_SECONDS
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): SongDurationDecision {
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if (actualDurationSeconds === null) {
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return { outcome: 'nocheck', durationSeconds: storedDurationSeconds }
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}
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if (storedDurationSeconds === null) {
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return { outcome: 'fill', durationSeconds: actualDurationSeconds }
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}
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if (Math.abs(actualDurationSeconds - storedDurationSeconds) > toleranceSeconds) {
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return { outcome: 'clear', durationSeconds: null }
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}
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return { outcome: 'keep', durationSeconds: storedDurationSeconds }
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}
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