more ts switches, use setcontext instead of stores

src/lib/stores.svelte.ts

@@ -1,10 +1,5 @@
-import { writable } from 'svelte/store';
 import { browser } from '$app/environment';
 import { SvelteSet } from 'svelte/reactivity';
-import type { Stream } from '$lib/types';
-
-export const currentStream = writable<Stream | null>(null);
-export const currentSongIndex = writable<number | null>(null);
 
 export const favoritedStreams = new SvelteSet<string>(
     JSON.parse((browser && localStorage.getItem('favoritedStreams')) || '[]')
@@ -42,45 +37,3 @@ export const tagList = [
     'moody',
     'uplifting'
 ];
-
-let timestampList: number[];
-
-// utility
-
-function locationOf(element: number, array: number[], start?: number, end?: number): number {
-    start = start || 0;
-    end = end || array.length;
-    const pivot = parseInt(String(start + (end - start) / 2), 10);
-    if (end - start <= 1 || array[pivot] === element) return pivot;
-    if (array[pivot] < element) {
-        return locationOf(element, array, pivot, end);
-    } else {
-        return locationOf(element, array, start, pivot);
-    }
-}
-
-// exported methods
-
-export function getSongAtTime(currentTime: number): number {
-    return locationOf(currentTime, timestampList) - 1;
-}
-
-// less operations needed when doing regular lookups
-export function updateCurrentSong(currentTime: number, songIndex: number): void {
-    function updateCurrentSongRecurse(songIndex: number): number {
-        if (currentTime >= timestampList[songIndex + 2]) {
-            return updateCurrentSongRecurse(songIndex + 1);
-        } else if (currentTime < timestampList[songIndex + 1]) {
-            return updateCurrentSongRecurse(songIndex - 1);
-        }
-        return songIndex;
-    }
-
-    currentSongIndex.set(updateCurrentSongRecurse(songIndex));
-}
-
-export function updateCurrentStream(stream: Stream): void {
-    currentStream.set(stream);
-    timestampList = [-Infinity, ...stream.tracks.map((track) => track[0]), Infinity];
-    currentSongIndex.set(0);
-}