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// Copyright (C) 2026 Max Boksem. See NOTICE for additional terms under GPLv3 section 7.
import {
createContext,
useContext,
useState,
useCallback,
useEffect,
useMemo,
useRef,
useSyncExternalStore,
} from "react";
import type { Channel, Category, Provider } from "@/lib/types";
import {
createRefreshTracker,
findDueRefreshes,
refreshKeys,
type RefreshTracker,
} from "@/lib/refresh-schedule";
import { deriveCategories } from "@/lib/channels";
import { readStorage, writeStorage } from "@/lib/storage";
import { useLatestRef } from "@/hooks/useLatestRef";
import {
loadM3uPlaylist,
loadM3uFile as loadM3uFileApi,
loadXtreamProvider,
getProviders,
removeProvider as removeProviderApi,
getAllChannels,
refreshProvider as refreshProviderApi,
refreshEpg as refreshEpgApi,
updateProvider as updateProviderApi,
toggleFavorite as toggleFavoriteApi,
} from "@/lib/tauri";
// --- Provider settings (stored in localStorage) ---
export interface ProviderSettings {
autoRefresh: boolean;
refreshIntervalHours: number;
epgAutoRefresh: boolean;
epgRefreshIntervalHours: number;
}
export const loadProviderSettings = (id: string): ProviderSettings => {
try {
const raw = localStorage.getItem(`provider-settings-${id}`);
if (raw) {
const parsed = JSON.parse(raw);
// Migrate from old 3-way string format ("disabled"|"startup"|"interval")
if (typeof parsed.autoRefresh === "string") {
return {
autoRefresh: parsed.autoRefresh !== "disabled",
refreshIntervalHours: parsed.refreshIntervalHours ?? 24,
epgAutoRefresh: parsed.epgAutoRefresh ?? true,
epgRefreshIntervalHours: parsed.epgRefreshIntervalHours ?? 24,
};
}
return {
epgAutoRefresh: true,
epgRefreshIntervalHours: 24,
...parsed,
} as ProviderSettings;
}
} catch {}
return {
autoRefresh: false,
refreshIntervalHours: 24,
epgAutoRefresh: true,
epgRefreshIntervalHours: 24,
};
};
export const saveProviderSettings = (id: string, settings: ProviderSettings) => {
localStorage.setItem(`provider-settings-${id}`, JSON.stringify(settings));
};
// EPG last-refresh timestamp stored separately (providers have no epg_last_updated field)
const epgLastRefreshKey = (id: string) => `epg-last-refresh-${id}`;
// A copy in memory keeps blocked storage from making every poll refresh the guide again.
const epgLastRefreshThisSession = new Map<string, number>();
export const getEpgLastRefresh = (id: string): number => {
const stored = parseInt(readStorage(epgLastRefreshKey(id)) ?? "0", 10) || 0;
return Math.max(stored, epgLastRefreshThisSession.get(id) ?? 0);
};
// Counts the guide refreshes that have finished, so the channel list knows to
// load the guide again. Every refresh, from the splash screen, the poll, an add
// or the settings dialog, records itself through setEpgLastRefresh.
let guideVersion = 0;
const guideListeners = new Set<() => void>();
/** Calls the listener after each guide refresh finishes, and returns a function that stops it. */
export const subscribeToGuide = (listener: () => void) => {
guideListeners.add(listener);
return () => {
guideListeners.delete(listener);
};
};
const getGuideVersion = () => guideVersion;
/** Records that this provider's guide just refreshed, and tells the channel list it changed. */
export const setEpgLastRefresh = (id: string) => {
const now = Date.now();
epgLastRefreshThisSession.set(id, now);
writeStorage(epgLastRefreshKey(id), String(now));
guideVersion += 1;
for (const listener of guideListeners) listener();
};
// Where the poll reads each provider's settings and last guide refresh.
const refreshLookups = {
settingsFor: loadProviderSettings,
epgLastRefreshFor: getEpgLastRefresh,
};
// Refreshes a provider's guide through the tracker, so the poll and an add
// never fetch the same guide at once.
const refreshGuide = (tracker: RefreshTracker, id: string) =>
tracker.run(refreshKeys.epg(id), () => refreshEpgApi(id).then(() => setEpgLastRefresh(id)));
// --- Context ---
interface ChannelsContextValue {
channels: Channel[];
categories: Category[];
providers: Provider[];
initialized: boolean;
loading: boolean;
error: string | null;
loadM3u: (name: string, url: string) => Promise<void>;
loadM3uFile: (name: string, path: string) => Promise<void>;
loadXtream: (name: string, url: string, username: string, password: string) => Promise<void>;
/** Loads the provider list again, and returns it, or null when it fails. */
refreshProviders: () => Promise<Provider[] | null>;
refreshChannels: () => Promise<void>;
refreshProvider: (id: string) => Promise<void>;
updateProvider: (
id: string,
name: string,
url: string,
username?: string,
password?: string
) => Promise<void>;
removeProvider: (id: string) => Promise<void>;
toggleFavorite: (channelId: string) => Promise<void>;
/** Runs the automatic refreshes, shared by the splash screen and the poll. */
autoRefresh: RefreshTracker;
/**
* Goes up each time a provider's guide finishes refreshing, so the guide on
* screen can load again.
*/
guideVersion: number;
}
export const ChannelsContext = createContext<ChannelsContextValue | null>(null);
export const useChannelsProvider = (): ChannelsContextValue => {
const [channels, setChannels] = useState<Channel[]>([]);
const [categories, setCategories] = useState<Category[]>([]);
const [providers, setProviders] = useState<Provider[]>([]);
const [initialized, setInitialized] = useState(false);
const [loading, setLoading] = useState(false);
const [error, setError] = useState<string | null>(null);
const guideVersion = useSyncExternalStore(subscribeToGuide, getGuideVersion);
const channelIndex = useMemo(() => {
const m = new Map<string, number>();
channels.forEach((ch, i) => m.set(ch.id, i));
return m;
}, [channels]);
const refreshChannels = useCallback(async () => {
try {
const chs = await getAllChannels();
setChannels(chs);
setCategories(deriveCategories(chs));
} catch (e) {
setError(String(e));
}
}, []);
const refreshProviders = useCallback(async () => {
try {
const list = await getProviders();
setProviders(list);
return list;
} catch (e) {
setError(String(e));
return null;
}
}, []);
const refreshProvider = useCallback(
async (id: string) => {
try {
await refreshProviderApi(id);
await refreshProviders();
await refreshChannels();
} catch (e) {
setError(String(e));
throw e;
}
},
[refreshProviders, refreshChannels]
);
const updateProvider = useCallback(
async (id: string, name: string, url: string, username?: string, password?: string) => {
try {
await updateProviderApi(id, name, url, username, password);
await refreshProviders();
} catch (e) {
setError(String(e));
throw e;
}
},
[refreshProviders]
);
// Keep providers ref current so the poll and an add can read it without re-registering
const providersRef = useLatestRef(providers);
const refreshProviderRef = useLatestRef(refreshProvider);
// The splash screen runs its startup refreshes through this tracker too, so
// the poll skips one the splash started that is still running.
const [autoRefresh] = useState(() => createRefreshTracker());
// Adding a provider of any kind runs the same steps around a different backend call.
const addProvider = useCallback(
async (add: () => Promise<unknown>) => {
setLoading(true);
setError(null);
const known = new Set(providersRef.current.map((p) => p.id));
try {
await add();
const list = await refreshProviders();
await refreshChannels();
// Fetch the new provider's guide now rather than at the next poll.
// Adding doesn't wait for it, since a guide can take a while.
if (list) {
const added = list.filter((p) => !known.has(p.id));
for (const id of findDueRefreshes(added, refreshLookups).epgIds) {
refreshGuide(autoRefresh, id);
}
}
} catch (e) {
setError(String(e));
throw e;
} finally {
setLoading(false);
}
},
// Stryker disable next-line ArrayDeclaration: every one of these stays the same object while the context provider is mounted, so an empty list gives the same callback.
[providersRef, refreshProviders, refreshChannels, autoRefresh]
);
const loadM3u = useCallback(
(name: string, url: string) => addProvider(() => loadM3uPlaylist(name, url)),
[addProvider]
);
const loadM3uFile = useCallback(
(name: string, path: string) => addProvider(() => loadM3uFileApi(name, path)),
[addProvider]
);
const loadXtream = useCallback(
(name: string, url: string, username: string, password: string) =>
addProvider(() => loadXtreamProvider(name, url, username, password)),
[addProvider]
);
const removeProvider = useCallback(
async (id: string) => {
try {
await removeProviderApi(id);
await refreshProviders();
await refreshChannels();
} catch (e) {
setError(String(e));
}
},
[refreshProviders, refreshChannels]
);
const toggleFavorite = useCallback(
async (channelId: string) => {
try {
const newFavorite = await toggleFavoriteApi(channelId);
setChannels((prev) => {
const idx = channelIndex.get(channelId);
if (idx === undefined) return prev;
const next = [...prev];
next[idx] = { ...next[idx], isFavorite: newFavorite };
return next;
});
} catch (e) {
setError(String(e));
}
},
[channelIndex]
);
// Initial load — ref guard prevents StrictMode double-mount from firing twice.
// Both providers and channels must load before `initialized` is set so the
// splash screen does not dismiss before the UI has data to display.
const didInit = useRef(false);
useEffect(() => {
Iif (didInit.current) return;
didInit.current = true;
Promise.all([refreshProviders(), refreshChannels()]).finally(() => {
setInitialized(true);
});
}, [refreshProviders, refreshChannels]);
// Poll every 60s to check if any provider/EPG is due for refresh.
// Using a ref-based approach avoids resetting timers on every providers update.
// The tracker skips refreshes still running and backs off after failures.
useEffect(() => {
const tick = () => {
const { playlistIds, epgIds } = findDueRefreshes(providersRef.current, refreshLookups);
for (const id of playlistIds) {
autoRefresh.run(refreshKeys.playlist(id), () => refreshProviderRef.current(id));
}
for (const id of epgIds) refreshGuide(autoRefresh, id);
};
tick(); // fire immediately on mount
const id = setInterval(tick, 60_000);
return () => clearInterval(id);
}, [autoRefresh, providersRef, refreshProviderRef]);
return {
channels,
categories,
providers,
initialized,
loading,
error,
loadM3u,
loadM3uFile,
loadXtream,
refreshProviders,
refreshChannels,
refreshProvider,
updateProvider,
removeProvider,
toggleFavorite,
autoRefresh,
guideVersion,
};
};
export const useChannels = (): ChannelsContextValue => {
const ctx = useContext(ChannelsContext);
if (!ctx) throw new Error("useChannels must be used within a ChannelsProvider");
return ctx;
};
/** The ids of the user's providers, which tell which provider a channel is from. */
export const useProviderIds = (): string[] => {
const { providers } = useChannels();
return useMemo(() => providers.map((p) => p.id), [providers]);
};
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