134 lines
3.6 KiB
TypeScript
134 lines
3.6 KiB
TypeScript
import type { SubtitleCue, SubtitleTrack } from '../types';
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import { state } from '../state';
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import { parseVtt } from './vtt';
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// proxy subtitle URL through backend (avoids CORS)
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const proxyUrl = (token: string) => `/watch/proxy/subtitle?token=${encodeURIComponent(token)}`;
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// builds subtitle track list from current mode's source
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const subtitlesForMode = (): SubtitleTrack[] => {
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const src = state.modeSources[state.currentMode];
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if (!src?.subtitles) return [];
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return src.subtitles
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.map(t => ({
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lang: (t.lang || 'unknown').toLowerCase(),
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label: t.lang || 'Unknown',
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url: proxyUrl(t.token),
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}))
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.filter(t => t.url !== '');
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};
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const hideSubtitleText = (): void => {
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const el = state.container.querySelector('[data-subtitle-text]') as HTMLElement | null;
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if (!el) return;
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el.textContent = '';
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el.classList.remove('block');
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el.classList.add('hidden');
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};
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// fetches and parses VTT from proxy URL
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const loadSubtitle = async (url: string): Promise<SubtitleCue[]> => {
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try {
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const res = await fetch(url);
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if (!res.ok) return [];
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return parseVtt(await res.text());
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} catch {
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return [];
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}
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};
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/**
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* Rebuilds subtitle dropdown from current mode's available tracks.
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* Shows/hides dropdown based on availability.
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*/
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export const updateSubtitleOptions = (): void => {
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const select = state.container.querySelector(
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'[data-subtitle-select]'
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) as HTMLSelectElement | null;
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if (!select) return;
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state.currentSubtitleTracks = subtitlesForMode();
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select.innerHTML = '';
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const none = document.createElement('option');
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none.value = 'none';
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none.textContent = 'Off';
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select.appendChild(none);
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select.value = 'none';
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state.currentSubtitleTracks.forEach((t, i) => {
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const opt = document.createElement('option');
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opt.value = String(i);
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opt.textContent = t.label;
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select.appendChild(opt);
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});
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const wrapper = select.parentElement;
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wrapper?.classList.toggle('hidden', state.currentSubtitleTracks.length === 0);
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state.activeSubtitles = [];
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hideSubtitleText();
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};
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/**
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* Updates subtitle text display based on current video time.
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* Finds active cue and shows/hides overlay.
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*/
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export const updateSubtitleRender = (time: number): void => {
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const el = state.container.querySelector('[data-subtitle-text]') as HTMLElement | null;
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if (!el) return;
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if (!state.activeSubtitles.length) {
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hideSubtitleText();
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return;
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}
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// binary search: cues are sorted by start time
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let lo = 0;
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let hi = state.activeSubtitles.length - 1;
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let cue: SubtitleCue | undefined;
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while (lo <= hi) {
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const mid = (lo + hi) >> 1;
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const c = state.activeSubtitles[mid];
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if (time < c.start) {
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hi = mid - 1;
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continue;
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}
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if (time > c.end) {
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lo = mid + 1;
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continue;
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}
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cue = c;
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break;
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}
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if (!cue) {
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hideSubtitleText();
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return;
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}
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el.textContent = cue.text;
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el.classList.remove('hidden');
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};
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/**
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* Binds subtitle select change handler.
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* Loads and parses selected VTT track.
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*/
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export const setupSubtitles = (): void => {
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const select = state.container.querySelector(
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'[data-subtitle-select]'
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) as HTMLSelectElement | null;
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select?.addEventListener('change', async () => {
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if (select.value === 'none') {
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state.activeSubtitles = [];
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hideSubtitleText();
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return;
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}
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const track = state.currentSubtitleTracks[Number(select.value)];
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if (!track) {
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state.activeSubtitles = [];
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return;
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}
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const cues = await loadSubtitle(track.url);
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cues.sort((a, b) => a.start - b.start);
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state.activeSubtitles = cues;
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});
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};
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