Refactor download queue

src/electron/ipc/download/DownloadQueue.ts

@@ -0,0 +1,43 @@
+import Comparators from 'comparators'
+import { ChartDownload } from './ChartDownload'
+
+export class DownloadQueue {
+
+  downloadQueue: ChartDownload[] = []
+
+  isEmpty() {
+    return this.downloadQueue.length == 0
+  }
+
+  push(chartDownload: ChartDownload) {
+    this.downloadQueue.push(chartDownload)
+    this.sort()
+  }
+
+  pop() {
+    return this.downloadQueue.pop()
+  }
+
+  get(versionID: number) {
+    return this.downloadQueue.find(download => download.versionID == versionID)
+  }
+
+  remove(versionID: number) {
+    const index = this.downloadQueue.findIndex(download => download.versionID == versionID)
+    if (index != -1) {
+      this.downloadQueue[index].cancel()
+      this.downloadQueue.splice(index, 1)
+    }
+  }
+
+  private sort() { // TODO: make this order be reflected in the GUI (along with currentDownload)
+    let comparator = Comparators.comparing('allFilesProgress', { reversed: true })
+
+    const prioritizeArchives = true
+    if (prioritizeArchives) {
+      comparator = comparator.thenComparing('isArchive', { reversed: true })
+    }
+
+    this.downloadQueue.sort(comparator)
+  }
+}