From 771f0918fb807bef2cc6d83af3a4a85129f921ee Mon Sep 17 00:00:00 2001
From: Julien Calixte <juliencalixte@gmail.com>
Date: Sun, 26 Jul 2020 22:20:02 +0200
Subject: [PATCH] :sparkles: (spotify) add spotify utility file

---
 src/utils/spotify.ts | 79 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/utils/spotify.ts

diff --git a/src/utils/spotify.ts b/src/utils/spotify.ts
new file mode 100644
index 0000000..2eb8bd9
--- /dev/null
+++ b/src/utils/spotify.ts
@@ -0,0 +1,79 @@
+let PLAYLIST_LINKS: string[] | null = null
+
+interface SpotifyTracks {
+  items: Array<{ track: { name: string } }>
+}
+
+const random = (max: number) => {
+  return Math.floor(Math.random() * Math.floor(max))
+}
+
+const getHeaders = (token: string) => ({
+  headers: {
+    accept: 'application/json',
+    'content-type': 'application/json',
+    authorization: `Bearer ${token}`
+  }
+})
+
+export const redirectToSpotifyConnect = () => {
+  const authorizeURL = new URL('https://accounts.spotify.com/authorize')
+  authorizeURL.searchParams.append(
+    'client_id',
+    process.env.VUE_APP_SPOTIFY_CLIENT_ID || ''
+  )
+  authorizeURL.searchParams.append('response_type', 'token')
+  authorizeURL.searchParams.append('show_dialog', 'false')
+  authorizeURL.searchParams.append(
+    'scope',
+    'streaming,user-modify-playback-state'
+  )
+  authorizeURL.searchParams.append('redirect_uri', `${location.origin}/spotify`)
+
+  location.href = authorizeURL.toString()
+}
+
+export const playOnSpotify = async (token: string, deviceId: string) => {
+  if (process.env.VUE_APP_PLAYLIST_URL && !PLAYLIST_LINKS) {
+    const playlistResult = await fetch(process.env.VUE_APP_PLAYLIST_URL)
+    PLAYLIST_LINKS = (await playlistResult.json()).playlists
+  }
+
+  if (!PLAYLIST_LINKS) {
+    return
+  }
+
+  const playlistId = PLAYLIST_LINKS[random(PLAYLIST_LINKS.length - 1)]
+    .split(':')
+    .pop()
+
+  const trackResult = await fetch(
+    `https://api.spotify.com/v1/playlists/${playlistId}/tracks?fields=items(track(name))`,
+    getHeaders(token)
+  )
+  const tracks = (await trackResult.json()) as SpotifyTracks
+
+  await fetch(
+    `https://api.spotify.com/v1/me/player/play?device_id=${deviceId}`,
+    {
+      method: 'PUT',
+      ...getHeaders(token),
+      body: JSON.stringify({
+        context_uri: PLAYLIST_LINKS[random(PLAYLIST_LINKS.length - 1)],
+        offset: {
+          position: random(tracks?.items?.length || 0)
+        }
+      })
+    }
+  )
+}
+
+export const pauseOnSpotify = async (token: string, deviceId: string) => {
+  await fetch(
+    `https://api.spotify.com/v1/me/player/pause?device_id=${deviceId}`,
+    {
+      method: 'PUT',
+      ...getHeaders(token)
+    }
+  )
+}