Restructure

src-angular/app/core/services/download.service.ts

@@ -0,0 +1,89 @@
+import { EventEmitter, Injectable } from '@angular/core'
+
+import { DownloadProgress, NewDownload } from '../../../electron/shared/interfaces/download.interface'
+import { ElectronService } from './electron.service'
+
+@Injectable({
+	providedIn: 'root',
+})
+export class DownloadService {
+
+	private downloadUpdatedEmitter = new EventEmitter<DownloadProgress>()
+	private downloads: DownloadProgress[] = []
+
+	constructor(private electronService: ElectronService) {
+		this.electronService.receiveIPC('download-updated', result => {
+			// Update <this.downloads> with result
+			const thisDownloadIndex = this.downloads.findIndex(download => download.versionID == result.versionID)
+			if (result.type == 'cancel') {
+				this.downloads = this.downloads.filter(download => download.versionID != result.versionID)
+			} else if (thisDownloadIndex == -1) {
+				this.downloads.push(result)
+			} else {
+				this.downloads[thisDownloadIndex] = result
+			}
+
+			this.downloadUpdatedEmitter.emit(result)
+		})
+	}
+
+	get downloadCount() {
+		return this.downloads.length
+	}
+
+	get completedCount() {
+		return this.downloads.filter(download => download.type == 'done').length
+	}
+
+	get totalDownloadingPercent() {
+		let total = 0
+		let count = 0
+		for (const download of this.downloads) {
+			if (!download.stale) {
+				total += download.percent
+				count++
+			}
+		}
+		return total / count
+	}
+
+	get anyErrorsExist() {
+		return this.downloads.find(download => download.type == 'error') ? true : false
+	}
+
+	addDownload(versionID: number, newDownload: NewDownload) {
+		if (!this.downloads.find(download => download.versionID == versionID)) { // Don't download something twice
+			if (this.downloads.every(download => download.type == 'done')) { // Reset overall progress bar if it finished
+				this.downloads.forEach(download => download.stale = true)
+			}
+			this.electronService.sendIPC('download', { action: 'add', versionID, data: newDownload })
+		}
+	}
+
+	onDownloadUpdated(callback: (download: DownloadProgress) => void) {
+		this.downloadUpdatedEmitter.subscribe(callback)
+	}
+
+	cancelDownload(versionID: number) {
+		const removedDownload = this.downloads.find(download => download.versionID == versionID)
+		if (['error', 'done'].includes(removedDownload.type)) {
+			this.downloads = this.downloads.filter(download => download.versionID != versionID)
+			removedDownload.type = 'cancel'
+			this.downloadUpdatedEmitter.emit(removedDownload)
+		} else {
+			this.electronService.sendIPC('download', { action: 'cancel', versionID })
+		}
+	}
+
+	cancelCompleted() {
+		for (const download of this.downloads) {
+			if (download.type == 'done') {
+				this.cancelDownload(download.versionID)
+			}
+		}
+	}
+
+	retryDownload(versionID: number) {
+		this.electronService.sendIPC('download', { action: 'retry', versionID })
+	}
+}