76 lines
2.4 KiB
TypeScript
76 lines
2.4 KiB
TypeScript
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import {
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Feature,
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type ThemeSwitcherData,
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fromStorage,
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} from "../../storage/exports.js";
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import {log, setBodyThemeClass, sleep} from "../../utilities/exports.js";
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export async function runThemeSwitcherFeature(): Promise<void> {
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const data = await fromStorage(Feature.ThemeSwitcher);
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const switchedTheme = await themeSwitcher(data.value);
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if (switchedTheme !== undefined) {
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log(`Theme Switcher: Switched to ${switchedTheme}`);
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}
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}
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async function themeSwitcher(
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data: ThemeSwitcherData,
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): Promise<string | undefined> {
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// Get the millisecond Unix times of each date for easier comparison.
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const [now, dateA, dateB] = [
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new Date(),
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getDateWithSpecificTime(data.hourA),
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getDateWithSpecificTime(data.hourB),
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].map((date) => date.getTime());
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// If we're in the range between date A and B then set it to theme A,
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// otherwise set it to theme B as we'll be in the other range.
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const theme = now > dateA && now <= dateB ? data.themeA : data.themeB;
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const themeSelector =
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document.querySelector<HTMLSelectElement>("select#theme") ?? undefined;
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if (themeSelector === undefined) {
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// If there is no theme selector on the page only change the body class.
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setBodyThemeClass(theme);
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return theme;
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}
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if (themeSelector.value === theme) {
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// If the theme is already set to the one we want to change to, do nothing.
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return;
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}
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themeSelector.value = theme;
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setBodyThemeClass(theme);
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// After 2 seconds dispatch a synthetic change event on the theme selector so
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// it changes the user's theme cookie. This isn't ideal because if it takes
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// longer than 2 seconds to initialize the Tildes JS handler for the theme
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// selector it won't do anything, but for now it's better than trying to set
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// the cookie ourselves which would require extra WebExtension permissions.
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void sleep(2000).then(() => {
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themeSelector.dispatchEvent(new Event("change"));
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});
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return theme;
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}
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/**
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* Create a date of today with the hours and minutes set to the given `HH:MM`
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* string, and the seconds and milliseconds set to 0.
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*/
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function getDateWithSpecificTime(time: string): Date {
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const components = time
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.split(":")
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.map(Number)
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// Make sure any conversions don't return `NaN`.
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.map((value) => (Number.isNaN(value) ? 0 : value));
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const date = new Date();
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date.setHours(components[0]);
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date.setMinutes(components[1]);
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date.setSeconds(0, 0);
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return date;
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}
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