Restructure

src-angular/app/core/services/album-art.service.ts

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+import { Injectable } from '@angular/core'
+
+import { ElectronService } from './electron.service'
+
+@Injectable({
+	providedIn: 'root',
+})
+export class AlbumArtService {
+
+	private imageCache: { [songID: number]: string } = {}
+
+	constructor(private electronService: ElectronService) { }
+
+	async getImage(songID: number): Promise<string | null> {
+		if (this.imageCache[songID] == undefined) {
+			const albumArtResult = await this.electronService.invoke('album-art', songID)
+			if (albumArtResult) {
+				this.imageCache[songID] = albumArtResult.base64Art
+			} else {
+				this.imageCache[songID] = null
+			}
+		}
+
+		return this.imageCache[songID]
+	}
+}

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 })
+	}
+}

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

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+import { Injectable } from '@angular/core'
+
+// If you import a module but never use any of the imported values other than as TypeScript types,
+// the resulting javascript file will look as if you never imported the module at all.
+import * as electron from 'electron'
+
+import { IPCEmitEvents, IPCInvokeEvents } from '../../../electron/shared/IPCHandler'
+
+const { app, getCurrentWindow, dialog, session } = window.require('@electron/remote')
+
+@Injectable({
+	providedIn: 'root',
+})
+export class ElectronService {
+	electron: typeof electron
+
+	get isElectron() {
+		return !!(window && window.process && window.process.type)
+	}
+
+	constructor() {
+		if (this.isElectron) {
+			this.electron = window.require('electron')
+			this.receiveIPC('log', results => results.forEach(result => console.log(result)))
+		}
+	}
+
+	get currentWindow() {
+		return getCurrentWindow()
+	}
+
+	/**
+	 * Calls an async function in the main process.
+	 * @param event The name of the IPC event to invoke.
+	 * @param data The data object to send across IPC.
+	 * @returns A promise that resolves to the output data.
+	 */
+	async invoke<E extends keyof IPCInvokeEvents>(event: E, data: IPCInvokeEvents[E]['input']) {
+		return this.electron.ipcRenderer.invoke(event, data) as Promise<IPCInvokeEvents[E]['output']>
+	}
+
+	/**
+	 * Sends an IPC message to the main process.
+	 * @param event The name of the IPC event to send.
+	 * @param data The data object to send across IPC.
+	 */
+	sendIPC<E extends keyof IPCEmitEvents>(event: E, data: IPCEmitEvents[E]) {
+		this.electron.ipcRenderer.send(event, data)
+	}
+
+	/**
+	 * Receives an IPC message from the main process.
+	 * @param event The name of the IPC event to receive.
+	 * @param callback The data object to receive across IPC.
+	 */
+	receiveIPC<E extends keyof IPCEmitEvents>(event: E, callback: (result: IPCEmitEvents[E]) => void) {
+		this.electron.ipcRenderer.on(event, (_event, ...results) => {
+			callback(results[0])
+		})
+	}
+
+	quit() {
+		app.exit()
+	}
+
+	openFolder(filepath: string) {
+		this.electron.shell.openPath(filepath)
+	}
+
+	showFolder(filepath: string) {
+		this.electron.shell.showItemInFolder(filepath)
+	}
+
+	showOpenDialog(options: Electron.OpenDialogOptions) {
+		return dialog.showOpenDialog(this.currentWindow, options)
+	}
+
+	get defaultSession() {
+		return session.defaultSession
+	}
+}

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

@@ -0,0 +1,119 @@
+import { EventEmitter, Injectable } from '@angular/core'
+
+import { SongResult, SongSearch } from 'src/electron/shared/interfaces/search.interface'
+import { VersionResult } from 'src/electron/shared/interfaces/songDetails.interface'
+import { ElectronService } from './electron.service'
+
+@Injectable({
+	providedIn: 'root',
+})
+export class SearchService {
+
+	private resultsChangedEmitter = new EventEmitter<SongResult[]>() // For when any results change
+	private newResultsEmitter = new EventEmitter<SongResult[]>()     // For when a new search happens
+	private errorStateEmitter = new EventEmitter<boolean>()          // To indicate the search's error state
+	private results: SongResult[] = []
+	private awaitingResults = false
+	private currentQuery: SongSearch
+	private _allResultsVisible = true
+
+	constructor(private electronService: ElectronService) { }
+
+	async newSearch(query: SongSearch) {
+		if (this.awaitingResults) { return }
+		this.awaitingResults = true
+		this.currentQuery = query
+		try {
+			this.results = this.trimLastChart(await this.electronService.invoke('song-search', this.currentQuery))
+			this.errorStateEmitter.emit(false)
+		} catch (err) {
+			this.results = []
+			console.log(err.message)
+			this.errorStateEmitter.emit(true)
+		}
+		this.awaitingResults = false
+
+		this.newResultsEmitter.emit(this.results)
+		this.resultsChangedEmitter.emit(this.results)
+	}
+
+	isLoading() {
+		return this.awaitingResults
+	}
+
+	/**
+	 * Event emitted when new search results are returned
+	 * or when more results are added to an existing search.
+	 * (emitted after `onNewSearch`)
+	 */
+	onSearchChanged(callback: (results: SongResult[]) => void) {
+		this.resultsChangedEmitter.subscribe(callback)
+	}
+
+	/**
+	 * Event emitted when a new search query is typed in.
+	 * (emitted before `onSearchChanged`)
+	 */
+	onNewSearch(callback: (results: SongResult[]) => void) {
+		this.newResultsEmitter.subscribe(callback)
+	}
+
+	/**
+	 * Event emitted when the error state of the search changes.
+	 * (emitted before `onSearchChanged`)
+	 */
+	onSearchErrorStateUpdate(callback: (isError: boolean) => void) {
+		this.errorStateEmitter.subscribe(callback)
+	}
+
+	get resultCount() {
+		return this.results.length
+	}
+
+	async updateScroll() {
+		if (!this.awaitingResults && !this._allResultsVisible) {
+			this.awaitingResults = true
+			this.currentQuery.offset += 50
+			this.results.push(...this.trimLastChart(await this.electronService.invoke('song-search', this.currentQuery)))
+			this.awaitingResults = false
+
+			this.resultsChangedEmitter.emit(this.results)
+		}
+	}
+
+	trimLastChart(results: SongResult[]) {
+		if (results.length > 50) {
+			results.splice(50, 1)
+			this._allResultsVisible = false
+		} else {
+			this._allResultsVisible = true
+		}
+
+		return results
+	}
+
+	get allResultsVisible() {
+		return this._allResultsVisible
+	}
+
+	/**
+	 * Orders `versionResults` by lastModified date, but prefer the
+	 * non-pack version if it's only a few days older.
+	 */
+	sortChart(versionResults: VersionResult[]) {
+		const dates: { [versionID: number]: number } = {}
+		versionResults.forEach(version => dates[version.versionID] = new Date(version.lastModified).getTime())
+		versionResults.sort((v1, v2) => {
+			const diff = dates[v2.versionID] - dates[v1.versionID]
+			if (Math.abs(diff) < 6.048e+8 && v1.driveData.inChartPack != v2.driveData.inChartPack) {
+				if (v1.driveData.inChartPack) {
+					return 1 // prioritize v2
+				} else {
+					return -1 // prioritize v1
+				}
+			} else {
+				return diff
+			}
+		})
+	}
+}

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

@@ -0,0 +1,85 @@
+import { EventEmitter, Injectable } from '@angular/core'
+
+import { SongResult } from '../../../electron/shared/interfaces/search.interface'
+import { SearchService } from './search.service'
+
+// Note: this class prevents event cycles by only emitting events if the checkbox changes
+
+@Injectable({
+	providedIn: 'root',
+})
+export class SelectionService {
+
+	private searchResults: SongResult[] = []
+
+	private selectAllChangedEmitter = new EventEmitter<boolean>()
+	private selectionChangedCallbacks: { [songID: number]: (selection: boolean) => void } = {}
+
+	private allSelected = false
+	private selections: { [songID: number]: boolean | undefined } = {}
+
+	constructor(searchService: SearchService) {
+		searchService.onSearchChanged(results => {
+			this.searchResults = results
+			if (this.allSelected) {
+				this.selectAll() // Select newly added rows if allSelected
+			}
+		})
+
+		searchService.onNewSearch(results => {
+			this.searchResults = results
+			this.selectionChangedCallbacks = {}
+			this.selections = {}
+			this.selectAllChangedEmitter.emit(false)
+		})
+	}
+
+	getSelectedResults() {
+		return this.searchResults.filter(result => this.selections[result.id] == true)
+	}
+
+	onSelectAllChanged(callback: (selected: boolean) => void) {
+		this.selectAllChangedEmitter.subscribe(callback)
+	}
+
+	/**
+	 * Emits an event when the selection for `songID` needs to change.
+	 * (note: only one emitter can be registered per `songID`)
+	 */
+	onSelectionChanged(songID: number, callback: (selection: boolean) => void) {
+		this.selectionChangedCallbacks[songID] = callback
+	}
+
+
+	deselectAll() {
+		if (this.allSelected) {
+			this.allSelected = false
+			this.selectAllChangedEmitter.emit(false)
+		}
+
+		setTimeout(() => this.searchResults.forEach(result => this.deselectSong(result.id)), 0)
+	}
+
+	selectAll() {
+		if (!this.allSelected) {
+			this.allSelected = true
+			this.selectAllChangedEmitter.emit(true)
+		}
+
+		setTimeout(() => this.searchResults.forEach(result => this.selectSong(result.id)), 0)
+	}
+
+	deselectSong(songID: number) {
+		if (this.selections[songID]) {
+			this.selections[songID] = false
+			this.selectionChangedCallbacks[songID](false)
+		}
+	}
+
+	selectSong(songID: number) {
+		if (!this.selections[songID]) {
+			this.selections[songID] = true
+			this.selectionChangedCallbacks[songID](true)
+		}
+	}
+}

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

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+import { Injectable } from '@angular/core'
+
+import { Settings } from 'src/electron/shared/Settings'
+import { ElectronService } from './electron.service'
+
+@Injectable({
+	providedIn: 'root',
+})
+export class SettingsService {
+	readonly builtinThemes = ['Default', 'Dark']
+
+	private settings: Settings
+	private currentThemeLink: HTMLLinkElement
+
+	constructor(private electronService: ElectronService) { }
+
+	async loadSettings() {
+		this.settings = await this.electronService.invoke('get-settings', undefined)
+		if (this.settings.theme != this.builtinThemes[0]) {
+			this.changeTheme(this.settings.theme)
+		}
+	}
+
+	saveSettings() {
+		this.electronService.sendIPC('set-settings', this.settings)
+	}
+
+	changeTheme(theme: string) {
+		if (this.currentThemeLink != undefined) this.currentThemeLink.remove()
+		if (theme == 'Default') { return }
+
+		const link = document.createElement('link')
+		link.type = 'text/css'
+		link.rel = 'stylesheet'
+		link.href = `./assets/themes/${theme.toLowerCase()}.css`
+		this.currentThemeLink = document.head.appendChild(link)
+	}
+
+	async getCacheSize() {
+		return this.electronService.defaultSession.getCacheSize()
+	}
+
+	async clearCache() {
+		this.saveSettings()
+		await this.electronService.defaultSession.clearCache()
+		await this.electronService.invoke('clear-cache', undefined)
+	}
+
+	// Individual getters/setters
+	get libraryDirectory() {
+		return this.settings.libraryPath
+	}
+	set libraryDirectory(newValue: string) {
+		this.settings.libraryPath = newValue
+		this.saveSettings()
+	}
+
+	get downloadVideos() {
+		return this.settings.downloadVideos
+	}
+	set downloadVideos(isChecked) {
+		this.settings.downloadVideos = isChecked
+		this.saveSettings()
+	}
+
+	get theme() {
+		return this.settings.theme
+	}
+	set theme(newValue: string) {
+		this.settings.theme = newValue
+		this.changeTheme(newValue)
+		this.saveSettings()
+	}
+
+	get rateLimitDelay() {
+		return this.settings.rateLimitDelay
+	}
+	set rateLimitDelay(delay: number) {
+		this.settings.rateLimitDelay = delay
+		this.saveSettings()
+	}
+}