// import * as zipBin from '7zip-bin'
// import { mkdir as _mkdir, readdir, unlink } from 'fs'
// import * as node7z from 'node-7z'
// import * as unrarjs from 'node-unrar-js' // TODO find better rar library that has async extraction
// import { FailReason } from 'node-unrar-js/dist/js/extractor'
// import { extname, join } from 'path'
// import { promisify } from 'util'

// import { devLog } from '../../shared/ElectronUtilFunctions'
// import { AnyFunction } from '../../shared/UtilFunctions'
// import { DownloadError } from './ChartDownload'

// const mkdir = promisify(_mkdir)

// interface EventCallback {
// 	'start': (filename: string) => void
// 	'extractProgress': (percent: number, fileCount: number) => void
// 	'error': (err: DownloadError, retry: () => void | Promise<void>) => void
// 	'complete': () => void
// }
// type Callbacks = { [E in keyof EventCallback]: EventCallback[E] }

// const extractErrors = {
// 	readError: (err: NodeJS.ErrnoException) => ({ header: `Failed to read file (${err.code})`, body: `${err.name}: ${err.message}` }),
// 	emptyError: () => ({ header: 'Failed to extract archive', body: 'File archive was downloaded but could not be found' }),
// 	rarmkdirError: (err: NodeJS.ErrnoException, sourceFile: string) => {
// 		return { header: `Extracting archive failed. (${err.code})`, body: `${err.name}: ${err.message} (${sourceFile})` }
// 	},
// 	rarextractError: (result: { reason: FailReason; msg: string }, sourceFile: string) => {
// 		return { header: `Extracting archive failed: ${result.reason}`, body: `${result.msg} (${sourceFile})` }
// 	},
// }

// export class FileExtractor {

// 	private callbacks = {} as Callbacks
// 	private wasCanceled = false
// 	constructor(private sourceFolder: string) { }

// 	/**
// 	 * Calls `callback` when `event` fires. (no events will be fired after `this.cancelExtract()` is called)
// 	 */
// 	on<E extends keyof EventCallback>(event: E, callback: EventCallback[E]) {
// 		this.callbacks[event] = callback
// 	}

// 	/**
// 	 * Extract the chart from `this.sourceFolder`. (assumes there is exactly one archive file in that folder)
// 	 */
// 	beginExtract() {
// 		setTimeout(this.cancelable(() => {
// 			readdir(this.sourceFolder, (err, files) => {
// 				if (err) {
// 					this.callbacks.error(extractErrors.readError(err), () => this.beginExtract())
// 				} else if (files.length == 0) {
// 					this.callbacks.error(extractErrors.emptyError(), () => this.beginExtract())
// 				} else {
// 					this.callbacks.start(files[0])
// 					this.extract(join(this.sourceFolder, files[0]), extname(files[0]) == '.rar')
// 				}
// 			})
// 		}), 100) // Wait for filesystem to process downloaded file
// 	}

// 	/**
// 	 * Extracts the file at `fullPath` to `this.sourceFolder`.
// 	 */
// 	private async extract(fullPath: string, useRarExtractor: boolean) {
// 		if (useRarExtractor) {
// 			await this.extractRar(fullPath) // Use node-unrar-js to extract the archive
// 		} else {
// 			this.extract7z(fullPath) // Use node-7z to extract the archive
// 		}
// 	}

// 	/**
// 	 * Extracts a .rar archive found at `fullPath` and puts the extracted results in `this.sourceFolder`.
// 	 * @throws an `ExtractError` if this fails.
// 	 */
// 	private async extractRar(fullPath: string) {
// 		const extractor = unrarjs.createExtractorFromFile(fullPath, this.sourceFolder)

// 		const fileList = extractor.getFileList()

// 		if (fileList[0].state != 'FAIL') {

// 			// Create directories for nested archives (because unrarjs didn't feel like handling that automatically)
// 			const headers = fileList[1].fileHeaders
// 			for (const header of headers) {
// 				if (header.flags.directory) {
// 					try {
// 						await mkdir(join(this.sourceFolder, header.name), { recursive: true })
// 					} catch (err) {
// 						this.callbacks.error(
// 							extractErrors.rarmkdirError(err, fullPath),
// 							() => this.extract(fullPath, extname(fullPath) == '.rar'),
// 						)
// 						return
// 					}
// 				}
// 			}
// 		}

// 		const extractResult = extractor.extractAll()

// 		if (extractResult[0].state == 'FAIL') {
// 			this.callbacks.error(
// 				extractErrors.rarextractError(extractResult[0], fullPath),
// 				() => this.extract(fullPath, extname(fullPath) == '.rar'),
// 			)
// 		} else {
// 			this.deleteArchive(fullPath)
// 		}
// 	}

// 	/**
// 	 * Extracts a .zip or .7z archive found at `fullPath` and puts the extracted results in `this.sourceFolder`.
// 	 */
// 	private extract7z(fullPath: string) {
// 		const zipBinPath = zipBin.path7za.replace('app.asar', 'app.asar.unpacked') // I love electron-builder packaging :)
// 		const stream = node7z.extractFull(fullPath, this.sourceFolder, { $progress: true, $bin: zipBinPath })

// 		stream.on('progress', this.cancelable((progress: { percent: number; fileCount: number }) => {
// 			this.callbacks.extractProgress(progress.percent, isNaN(progress.fileCount) ? 0 : progress.fileCount)
// 		}))

// 		let extractErrorOccured = false
// 		stream.on('error', this.cancelable(() => {
// 			extractErrorOccured = true
// 			devLog(`Failed to extract [${fullPath}]; retrying with .rar extractor...`)
// 			this.extract(fullPath, true)
// 		}))

// 		stream.on('end', this.cancelable(() => {
// 			if (!extractErrorOccured) {
// 				this.deleteArchive(fullPath)
// 			}
// 		}))
// 	}

// 	/**
// 	 * Tries to delete the archive at `fullPath`.
// 	 */
// 	private deleteArchive(fullPath: string) {
// 		unlink(fullPath, this.cancelable(err => {
// 			if (err && err.code != 'ENOENT') {
// 				devLog(`Warning: failed to delete archive at [${fullPath}]`)
// 			}

// 			this.callbacks.complete()
// 		}))
// 	}

// 	/**
// 	 * Stop the process of extracting the file. (no more events will be fired after this is called)
// 	 */
// 	cancelExtract() {
// 		this.wasCanceled = true
// 	}

// 	/**
// 	 * Wraps a function that is able to be prevented if `this.cancelExtract()` was called.
// 	 */
// 	private cancelable<F extends AnyFunction>(fn: F) {
// 		return (...args: Parameters<F>): ReturnType<F> => {
// 			if (this.wasCanceled) { return }
// 			return fn(...Array.from(args))
// 		}
// 	}
// }