Download Selected button, Various small improvements

src/electron/ipc/BatchSongDetailsHandler.ipc.ts

@@ -0,0 +1,22 @@
+import { IPCInvokeHandler } from '../shared/IPCHandler'
+import Database from '../shared/Database'
+import { VersionResult } from '../shared/interfaces/songDetails.interface'
+
+export default class BatchSongDetailsHandler implements IPCInvokeHandler<'batch-song-details'> {
+  event: 'batch-song-details' = 'batch-song-details'
+  // TODO: add method documentation
+
+  async handler(songIDs: number[]) {
+    const db = await Database.getInstance()
+
+    return db.sendQuery(this.getVersionQuery(songIDs)) as Promise<VersionResult[]>
+  }
+
+  private getVersionQuery(songIDs: number[]) {
+    return `
+      SELECT *
+      FROM VersionMetaFull
+      WHERE songID IN (${songIDs.join(',')});
+    `
+  }
+}