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52 lines
2.4 KiB
TypeScript
52 lines
2.4 KiB
TypeScript
export const MIN_WALLPAPER_FREQUENCY_HOURS = 1;
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export const MAX_WALLPAPER_FREQUENCY_HOURS = 48;
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export const DEFAULT_WALLPAPER_FREQUENCY_HOURS = 24;
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export const getWallpaperFrequencyHours = (frequency: string): number => {
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if (!frequency) return DEFAULT_WALLPAPER_FREQUENCY_HOURS;
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const match = frequency.match(/^(\d+)(h|d)$/);
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if (!match) return DEFAULT_WALLPAPER_FREQUENCY_HOURS;
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const value = parseInt(match[1], 10);
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const hours = match[2] === 'd' ? value * 24 : value;
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return Math.min(MAX_WALLPAPER_FREQUENCY_HOURS, Math.max(MIN_WALLPAPER_FREQUENCY_HOURS, hours));
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};
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export const getWallpaperFrequencyMs = (frequency: string): number =>
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getWallpaperFrequencyHours(frequency) * 60 * 60 * 1000;
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export const formatWallpaperFrequency = (hours: number): string =>
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`${hours} ${hours === 1 ? 'hour' : 'hours'}`;
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export const getRandomWallpaperIndex = (wallpaperCount: number, currentIndex: number): number => {
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if (wallpaperCount <= 1) return 0;
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const offset = Math.floor(Math.random() * (wallpaperCount - 1)) + 1;
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return (currentIndex + offset) % wallpaperCount;
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};
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export const loadWallpaperState = (names: string[], now = Date.now()) => {
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let state: Record<string, unknown> = {};
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try {
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const parsed: unknown = JSON.parse(localStorage.getItem('wallpaperState') || '{}');
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if (parsed && typeof parsed === 'object') state = parsed as Record<string, unknown>;
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} catch {
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state = {};
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}
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const namedIndex = typeof state.currentName === 'string' ? names.indexOf(state.currentName) : -1;
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const index = namedIndex >= 0 ? namedIndex : typeof state.currentName === 'string' ? 0 : state.currentIndex;
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const currentIndex = typeof index === 'number' && Number.isInteger(index) && index >= 0 && index < names.length ? index : 0;
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const timestamp = typeof state.lastWallpaperChange === 'string' ? Date.parse(state.lastWallpaperChange) : NaN;
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const lastChange = Number.isFinite(timestamp) && timestamp <= now && timestamp >= 0 ? timestamp : now;
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return { currentIndex, lastChange };
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};
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export const saveWallpaperState = (names: string[], currentIndex: number, lastChange: number): void => {
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const payload = JSON.stringify({
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currentIndex,
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currentName: names[currentIndex],
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lastWallpaperChange: new Date(lastChange).toISOString(),
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});
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if (localStorage.getItem('wallpaperState') !== payload) {
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localStorage.setItem('wallpaperState', payload);
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}
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};
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