/* eslint-disable no-use-before-define */
import axios from 'axios';
import { exec, spawn } from 'child_process';
import { green, red } from 'colors';
import { ExifData, ExifImage } from 'exif';
import * as exifr from 'exifr';
import * as ffmpeg from 'fluent-ffmpeg';
import * as formidable from 'formidable';
import { File } from 'formidable';
import * as fs from 'fs';
import { createReadStream, createWriteStream, existsSync, readFileSync, rename, unlinkSync, writeFile } from 'fs';
import { Jimp } from 'jimp';
import * as md5File from 'md5-file';
import * as path from 'path';
import { basename } from 'path';
import * as parse from 'pdf-parse';
import * as request from 'request-promise';
import { Duplex, Stream } from 'stream';
import { Worker, isMainThread, parentPort } from 'worker_threads';
import { Utils } from '../Utils';
import requestImageSize from '../client/util/request-image-size';
import { createIfNotExists } from './ActionUtilities';
import { AzureManager } from './ApiManagers/AzureManager';
import { AcceptableMedia, Upload } from './SharedMediaTypes';
import { Directory, clientPathToFile, filesDirectory, pathToDirectory, publicDirectory, serverPathToFile } from './SocketData';
import { resolvedServerUrl } from './server_Initialization';

// Create an array to store worker threads
enum workertasks {
    JIMP = 'jimp',
}
const JimpWorker: Worker | undefined = isMainThread ? new Worker(__filename) : undefined;
export const workerResample = (imgSourcePath: string, outputPath: string, origSuffix: SizeSuffix, unlinkSource: boolean) => {
    JimpWorker?.postMessage({ task: workertasks.JIMP, imgSourcePath, outputPath, origSuffix, unlinkSource });
};

if (isMainThread) {
    // main thread code if needed ...
} else {
    // Worker thread code - Listens for messages from the main thread
    parentPort?.on('message', message => {
        switch (message.task) {
            case workertasks.JIMP:
                return workerResampleImage(message);
            default:
        }
    });

    async function workerResampleImage(message: { imgSourcePath: string; outputPath: string; origSuffix: string; unlinkSource: boolean }) {
        const { imgSourcePath, outputPath, origSuffix, unlinkSource } = message;
        const extension = path.extname(imgSourcePath);
        const sizes = !origSuffix ? [{ width: 400, suffix: SizeSuffix.Medium }] : DashUploadUtils.imageResampleSizes(extension === '.xml' ? '.png' : extension);
        // prettier-ignore
        Jimp.read(imgSourcePath)
            .then(img => 
                sizes.forEach(({ width, suffix }) =>
                    img.resize({ w: width || img.bitmap.width })
                        .write(InjectSize(outputPath, suffix) as `${string}.${string}`)
                        .catch(e => console.log("Jimp error:", e))
                ))
            .catch(e => console.log('Error Jimp:', e))
            .finally(() => unlinkSource && unlinkSync(imgSourcePath));
    }
}

export enum SizeSuffix {
    Small = '_s',
    Medium = '_m',
    Large = '_l',
    Original = '_o',
    None = '',
}

export function InjectSize(filename: string, size: SizeSuffix) {
    const extension = path.extname(filename).toLowerCase();
    return filename.substring(0, filename.length - extension.length) + size + extension;
}

function isLocal() {
    return /Dash-Web[0-9]*[\\/]src[\\/]server[\\/]public[\\/](.*)/;
}

function usingAzure() {
    return process.env.USE_AZURE === 'true';
}

export namespace DashUploadUtils {
    export interface Size {
        width: number;
        suffix: SizeSuffix;
    }

    export const Sizes: { [size: string]: Size } = {
        LARGE: { width: 800, suffix: SizeSuffix.Large },
        MEDIUM: { width: 400, suffix: SizeSuffix.Medium },
        SMALL: { width: 100, suffix: SizeSuffix.Small },
    };

    export function validateExtension(url: string) {
        return AcceptableMedia.imageFormats.includes(path.extname(url).toLowerCase());
    }

    const size = 'content-length';
    const type = 'content-type';

    const { BLOBSTORE_URL, RESIZE_FUNCTION_URL } = process.env;

    const { imageFormats, videoFormats, applicationFormats, audioFormats } = AcceptableMedia; // TODO:glr

    export function fExists(name: string, destination: Directory) {
        const destinationPath = serverPathToFile(destination, name);
        return existsSync(destinationPath);
    }

    export function getAccessPaths(directory: Directory, fileName: string) {
        return {
            client: clientPathToFile(directory, fileName),
            server: serverPathToFile(directory, fileName),
        };
    }
    export async function concatVideos(filePaths: string[]): Promise<Upload.AccessPathInfo> {
        // make a list of paths to create the ordered text file for ffmpeg
        const inputListName = 'concat.txt';
        const textFilePath = path.join(filesDirectory, inputListName);
        // make a list of paths to create the ordered text file for ffmpeg
        const filePathsText = filePaths.map(filePath => `file '${filePath}'`).join('\n');
        // write the text file to the file system
        await new Promise<void>((res, reject) => {
            writeFile(textFilePath, filePathsText, err => {
                if (err) {
                    reject();
                    console.log(err);
                } else res();
            });
        });

        // make output file name based on timestamp
        const outputFileName = `output-${Utils.GenerateGuid()}.mp4`;
        // create the output file path in the videos directory
        const outputFilePath = path.join(pathToDirectory(Directory.videos), outputFileName);

        // concatenate the videos
        await new Promise((resolve, reject) => {
            ffmpeg()
                .input(textFilePath)
                .inputOptions(['-f concat', '-safe 0'])
                // .outputOptions('-c copy')
                // .videoCodec("copy")
                .save(outputFilePath)
                .on('error', err => {
                    console.log(err);
                    reject();
                })
                .on('end', resolve);
        });

        // delete concat.txt from the file system
        unlinkSync(textFilePath);
        // delete the old segment videos from the server
        filePaths.forEach(filePath => unlinkSync(filePath));

        // return the path(s) to the output file
        return {
            accessPaths: getAccessPaths(Directory.videos, outputFileName),
        };
    }

    function resolveExistingFile(name: string, pat: string, directory: Directory, mimetype?: string | null, duration?: number, rawText?: string): Upload.FileResponse<Upload.FileInformation> {
        const data = { size: 0, filepath: pat, name, type: mimetype ?? '', originalFilename: name, newFilename: path.basename(pat), mimetype: mimetype || null, hashAlgorithm: false as falsetype };
        const file = { ...data, toJSON: () => ({ ...data, length: 0, filename: data.filepath.replace(/.*\//, ''), mtime: new Date(), mimetype: mimetype || null }) };
        return {
            source: file || null,
            result: {
                accessPaths: {
                    agnostic: getAccessPaths(directory, data.filepath),
                },
                rawText,
                duration,
            },
        };
    }

    export const uploadProgress = new Map<string, string>();

    export function QueryYoutubeProgress(videoId: string) {
        // console.log(`PROGRESS:${videoId}`, (user as any)?.email);
        return uploadProgress.get(videoId) ?? 'pending data upload';
    }

    /**
     * Basically just a wrapper around rename, which 'deletes'
     * the file at the old path and 'moves' it to the new one. For simplicity, the
     * caller just has to pass in the name of the target directory, and this function
     * will resolve the actual target path from that.
     * @param file The file to move
     * @param destination One of the specific media asset directories into which to move it
     * @param suffix If the file doesn't have a suffix and you want to provide it one
     * to appear in the new location
     */
    export async function MoveParsedFile(file: formidable.File, destination: Directory, suffix?: string, text?: string, duration?: number, targetName?: string): Promise<Upload.FileResponse> {
        const { filepath } = file;
        let name = targetName ?? path.basename(filepath);
        suffix && (name += suffix);
        return new Promise(resolve => {
            const destinationPath = serverPathToFile(destination, name);
            rename(filepath, destinationPath, error => {
                resolve({
                    source: file,
                    result: error ?? {
                        accessPaths: {
                            agnostic: getAccessPaths(destination, name),
                        },
                        rawText: text,
                        duration,
                    },
                });
            });
        });
    }

    const parseExifData = async (source: string) => {
        const image = await request.get(source, { encoding: null });
        const { /* data, */ error } = await new Promise<{ data: ExifData; error: string | undefined }>(resolve => {
            new ExifImage({ image }, (exifError, data) => resolve({ data, error: exifError?.message }));
        });
        return error ? { data: undefined, error } : { data: await exifr.parse(image), error };
    };
    /**
     * Based on the url's classification as local or remote, gleans
     * as much information as possible about the specified image
     *
     * @param source is the path or url to the image in question
     */
    export const InspectImage = async (sourceIn: string): Promise<Upload.InspectionResults | Error> => {
        let source = sourceIn;
        const rawMatches = /^data:image\/([a-z]+);base64,(.*)/.exec(source);
        let filename: string | undefined;
        /**
         * Just more edge case handling: this if clause handles the case where an image onto the canvas that
         * is represented by a base64 encoded data uri, rather than a proper file. We manually write it out
         * to the server and then carry on as if it had been put there by the Formidable form / file parser.
         */
        if (rawMatches !== null) {
            const [ext, data] = rawMatches.slice(1, 3);
            filename = `upload_${Utils.GenerateGuid()}.${ext}`;
            const resolved = filename;
            if (usingAzure()) {
                await AzureManager.UploadBase64ImageBlob(resolved, data);
                source = `${AzureManager.BASE_STRING}/${resolved}`;
            } else {
                source = `${resolvedServerUrl}${clientPathToFile(Directory.images, resolved)}`;
                source = serverPathToFile(Directory.images, resolved);
                const error = await new Promise<Error | null>(resolve => {
                    writeFile(serverPathToFile(Directory.images, resolved), data, 'base64', resolve);
                });
                if (error !== null) {
                    return error;
                }
            }
        }
        let resolvedUrl: string;
        /**
         *
         * At this point, we want to take whatever url we have and make sure it's requestable.
         * Anything that's hosted by some other website already is, but if the url is a local file url
         * (locates the file on this server machine), we have to resolve the client side url by cutting out the
         * basename subtree (i.e. /images/<some_guid>.<ext>) and put it on the end of the server's url.
         *
         * This can always be localhost, regardless of whether this is on the server or not, since we (the server, not the client)
         * will be the ones making the request, and from the perspective of dash-release or dash-web, localhost:<port> refers to the same thing
         * as the full dash-release.eastus.cloudapp.azure.com:<port>.
         */
        const matches = isLocal().exec(source);
        if (matches === null) {
            resolvedUrl = source;
        } else {
            resolvedUrl = `${resolvedServerUrl}/${matches[1].split('\\').join('/')}`;
        }
        // See header comments: not all image files have exif data (I believe only JPG is the only format that can have it)
        const exifData = await parseExifData(resolvedUrl);
        const results = {
            exifData,
            requestable: resolvedUrl,
        };

        // Use the request library to parse out file level image information in the headers
        const headerResult = await new Promise<{ headers: { [key: string]: string } }>((resolve, reject) => {
            request.head(resolvedUrl, (error, res) => (error ? reject(error) : resolve(res as { headers: { [key: string]: string } })));
        }).catch(e => {
            console.log('Error processing headers: ', e);
        });
        const { headers } = headerResult !== null && typeof headerResult === 'object' ? headerResult : { headers: {} as { [key: string]: string } };

        try {
            // Compute the native width and height ofthe image with an npm module
            const { width: nativeWidth, height: nativeHeight } = await requestImageSize(resolvedUrl).catch(() => ({ width: 0, height: 0 }));
            // Bundle up the information into an object
            return {
                source,
                contentSize: parseInt(headers[size]),
                contentType: headers[type],
                nativeWidth,
                nativeHeight,
                filename,
                ...results,
            };
        } catch (e: unknown) {
            return new Error(e ? e.toString?.() : 'unkown error');
        }
    };

    /**
     * define the resizers to use
     * @param ext the extension
     * @returns an array of resize descriptions
     */
    export function imageResampleSizes(ext: string): DashUploadUtils.ImageResizer[] {
        return [
            { suffix: SizeSuffix.Original, width: 0 },
            ...[...(AcceptableMedia.imageFormats.includes(ext.toLowerCase()) ? Object.values(DashUploadUtils.Sizes) : [])].map(({ suffix, width }) => ({
                width,
                suffix,
            })),
        ];
    }

    /**
     * outputResizedImages takes in a readable stream and resizes the images according to the sizes defined at the top of this file.
     *
     * The new images will be saved to the server with the corresponding prefixes.
     * @param imgSourcePath file path for image being resized
     * @param outputFileName the basename (No suffix) of the outputted file.
     * @param outputDirectory the directory to output to, usually Directory.Images
     * @returns a map with suffixes as keys and resized filenames as values.
     */
    export async function outputResizedImages(imgSourcePath: string, outputFileName: string, unlinkSource: boolean) {
        const writtenFiles: { [suffix: string]: string } = {};
        const outputPath = path.resolve(pathToDirectory(Directory.images), outputFileName);
        const sizes = imageResampleSizes(path.extname(outputFileName));

        if (unlinkSource) {
            const imgReadStream = new Duplex();
            imgReadStream.push(fs.readFileSync(imgSourcePath));
            imgReadStream.push(null);
            await Promise.all(
                sizes.map(({ suffix }) => 
                    new Promise<void>(res =>
                        imgReadStream.pipe(createWriteStream(writtenFiles[suffix] = InjectSize(outputPath, suffix))).on('close', res)
                    )
            )); // prettier-ignore
        } else {
            await Promise.all(
                sizes.map(({ suffix }) => 
                    new Promise<void>(res =>
                        request.get(imgSourcePath).pipe(createWriteStream(writtenFiles[suffix] = InjectSize(outputPath, suffix))).on('close', res)
                    )
            )); // prettier-ignore
        }

        workerResample(imgSourcePath, outputPath, SizeSuffix.Original, unlinkSource);
        return writtenFiles;
    }

    /**
     * UploadInspectedImage() takes an image with its metadata. If Azure is being used, this method will call the Azure function
     * to execute the resizing. If Azure is not used, the function will begin to resize the image.
     *
     * @param metadata metadata object from InspectImage()
     * @param filename the name of the file
     * @param prefix the prefix to use, which will be set to '' if none is provided.
     * @param cleanUp a boolean indicating if the files should be deleted after upload. True by default.
     * @returns the accessPaths for the resized files.
     */
    export const UploadInspectedImage = async (metadata: Upload.InspectionResults, filename: string, prefix = '', cleanUp = true): Promise<Upload.ImageInformation> => {
        const { requestable, ...remaining } = metadata;
        const dfltSuffix = remaining.contentType.split('/')[1].toLowerCase();
        const resolved = filename || `${prefix}upload_${Utils.GenerateGuid()}.${dfltSuffix === 'xml' ? 'jpg' : dfltSuffix}`;
        const { images } = Directory;
        const information: Upload.ImageInformation = {
            accessPaths: {
                agnostic: usingAzure()
                    ? {
                          client: BLOBSTORE_URL + `/${resolved}`,
                          server: BLOBSTORE_URL + `/${resolved}`,
                      }
                    : getAccessPaths(images, resolved),
            },
            ...metadata,
        };
        let writtenFiles: { [suffix: string]: string };

        if (usingAzure()) {
            if (!RESIZE_FUNCTION_URL) {
                throw new Error('Resize function URL not provided.');
            }

            try {
                const response = await axios.post(RESIZE_FUNCTION_URL, {
                    url: requestable,
                    filename: resolved,
                });
                writtenFiles = response.data.writtenFiles;
            } catch (err) {
                console.error(err);
                writtenFiles = {};
            }
        } else {
            const unlinkSrcWhenFinished = cleanUp; // isLocal().test(source) && cleanUp;
            try {
                writtenFiles = await outputResizedImages(metadata.source, resolved, unlinkSrcWhenFinished);
            } catch {
                // input is a blob or other, try reading it to create a metadata source file.
                const reqSource = request(metadata.source);
                const readStream: Stream = reqSource instanceof Promise ? await reqSource : reqSource;
                const readSource = `${prefix}upload_${Utils.GenerateGuid()}.${metadata.contentType.split('/')[1].toLowerCase()}`;
                await new Promise<void>((res, rej) => {
                    readStream
                        .pipe(createWriteStream(readSource))
                        .on('close', () => res())
                        .on('error', () => rej());
                });
                writtenFiles = await outputResizedImages(readSource, resolved, unlinkSrcWhenFinished);
                //fs.unlink(readSource, err => console.log("Couldn't unlink temporary image file:" + readSource, err));
            }
        }
        Array.from(Object.keys(writtenFiles)).forEach(suffix => {
            information.accessPaths[suffix] = getAccessPaths(images, writtenFiles[suffix]);
        });

        return information;
    };

    /**
     * Uploads an image specified by the @param source to Dash's /public/files/
     * directory, and returns information generated during that upload
     *
     * @param {string} source is either the absolute path of an already uploaded image or
     * the url of a remote image
     * @param {string} filename dictates what to call the image. If not specified,
     * the name {@param prefix}_upload_{GUID}
     * @param {string} prefix is a string prepended to the generated image name in the
     * event that @param filename is not specified
     *
     * @returns {ImageUploadInformation | Error} This method returns
     * 1) the paths to the uploaded images (plural due to resizing)
     * 2) the exif data embedded in the image, or the error explaining why exif couldn't be parsed
     * 3) the size of the image, in bytes (4432130)
     * 4) the content type of the image, i.e. image/(jpeg | png | ...)
     */
    export const UploadImage = (source: string, filename?: string, prefix: string = ''): Promise<Upload.ImageInformation | Error> =>
        InspectImage(source).then(async result =>
            result instanceof Error
                ? ({ name: result.name, message: result.message } as Error) //
                : UploadInspectedImage(result, filename || result.filename || '', prefix, isLocal().exec(source) || source.startsWith('data:') ? true : false)
        );

    type md5 = 'md5';
    type falsetype = false;
    export function uploadYoutube(videoId: string, overwriteId: string): Promise<Upload.FileResponse> {
        return new Promise<Upload.FileResponse<Upload.FileInformation>>(res => {
            const name = videoId;
            const filepath = name.replace(/^-/, '__') + '.mp4';
            const finalPath = serverPathToFile(Directory.videos, filepath);
            if (existsSync(finalPath)) {
                uploadProgress.set(overwriteId, 'computing duration');
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                exec(`yt-dlp -o ${finalPath} "https://www.youtube.com/watch?v=${videoId}" --get-duration`, (error: any, stdout: any /* , stderr: any */) => {
                    const time = Array.from(stdout.trim().split(':')).reverse();
                    const duration = (time.length > 2 ? Number(time[2]) * 1000 * 60 : 0) + (time.length > 1 ? Number(time[1]) * 60 : 0) + (time.length > 0 ? Number(time[0]) : 0);
                    res(resolveExistingFile(name, filepath, Directory.videos, 'video/mp4', duration, undefined));
                });
            } else {
                uploadProgress.set(overwriteId, 'starting download');
                const ytdlp = spawn(`yt-dlp`, ['-o', filepath, `https://www.youtube.com/watch?v=${videoId}`, '--max-filesize', '100M', '-f', 'mp4']);

                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                ytdlp.stdout.on('data', (data: any) => uploadProgress.set(overwriteId, data.toString()));

                let errors = '';
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                ytdlp.stderr.on('data', (data: any) => {
                    uploadProgress.set(overwriteId, 'error:' + data.toString());
                    errors = data.toString();
                });

                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                ytdlp.on('exit', (code: any) => {
                    if (code) {
                        res({
                            source: {
                                size: 0,
                                filepath: name,
                                originalFilename: name,
                                newFilename: name,
                                mimetype: 'video',
                                hashAlgorithm: 'md5',
                                toJSON: () => ({ newFilename: name, filepath, mimetype: 'video', mtime: new Date(), size: 0, length: 0, originalFilename: name }),
                            },
                            result: { name: 'failed youtube query', message: `Could not archive video.  ${code ? errors : uploadProgress.get(videoId)}` },
                        });
                    } else {
                        uploadProgress.set(overwriteId, 'computing duration');
                        exec(`yt-dlp-o ${filepath} "https://www.youtube.com/watch?v=${videoId}" --get-duration`, (/* error: any, stdout: any, stderr: any */) => {
                            // const time = Array.from(stdout.trim().split(':')).reverse();
                            // const duration = (time.length > 2 ? Number(time[2]) * 1000 * 60 : 0) + (time.length > 1 ? Number(time[1]) * 60 : 0) + (time.length > 0 ? Number(time[0]) : 0);
                            const data = { size: 0, filepath, name, mimetype: 'video', originalFilename: name, newFilename: name, hashAlgorithm: 'md5' as md5, type: 'video/mp4' };
                            const file = { ...data, toJSON: () => ({ ...data, length: 0, filename: data.filepath.replace(/.*\//, ''), mtime: new Date() }) };
                            MoveParsedFile(file, Directory.videos).then(output => res(output));
                        });
                    }
                });
            }
        });
    }
    const manualSuffixes = ['.webm'];

    async function UploadAudio(file: File, format: string) {
        const suffix = manualSuffixes.includes(format) ? format : undefined;
        return MoveParsedFile(file, Directory.audio, suffix);
    }

    async function UploadPdf(file: File) {
        const fileKey = (await md5File(file.filepath)) + '.pdf';
        const textFilename = `${fileKey.substring(0, fileKey.length - 4)}.txt`;
        if (fExists(fileKey, Directory.pdfs) && fExists(textFilename, Directory.text)) {
            fs.unlink(file.filepath, () => {});
            return new Promise<Upload.FileResponse>(res => {
                const pdfTextFilename = `${fileKey.substring(0, fileKey.length - 4)}.txt`;
                const readStream = createReadStream(serverPathToFile(Directory.text, pdfTextFilename));
                let rawText = '';
                readStream
                    .on('data', chunk => {
                        rawText += chunk.toString();
                    })
                    .on('end', () => res(resolveExistingFile(file.originalFilename ?? '', fileKey, Directory.pdfs, file.mimetype, undefined, rawText)));
            });
        }
        const dataBuffer = readFileSync(file.filepath);
        const result: parse.Result = await parse(dataBuffer).catch(e => e);
        if (result?.text) {
            await new Promise<void>((resolve, reject) => {
                const writeStream = createWriteStream(serverPathToFile(Directory.text, textFilename));
                writeStream.write(result?.text ?? '', error => (error ? reject(error) : resolve()));
            });
            return MoveParsedFile(file, Directory.pdfs, undefined, result?.text, undefined, fileKey);
        }
        return { source: file, result: { name: 'failed pdf upload', message: `Could not upload (${file.originalFilename}) ${result}` } };
    }

    async function UploadCsv(file: File) {
        const { filepath: sourcePath } = file;
        // read the file as a string
        const data = readFileSync(sourcePath, 'utf8');
        // split the string into an array of lines
        return MoveParsedFile(file, Directory.csv, undefined, data);
        // console.log(csvParser(data));
    }

    export async function upload(file: File /* , overwriteGuid?: string */): Promise<Upload.FileResponse> {
        // const isAzureOn = usingAzure();
        const { mimetype, filepath, originalFilename } = file;
        const types = mimetype?.split('/') ?? [];
        // uploadProgress.set(overwriteGuid ?? name, 'uploading'); // If the client sent a guid it uses to track upload progress, use that guid. Otherwise, use the file's name.

        const category = types[0];
        let format = `.${types[1]}`;
        console.log(green(`Processing upload of file (${originalFilename}) and format (${format}) with upload type (${mimetype}) in category (${category}).`));

        switch (category) {
            case 'image':
                if (imageFormats.includes(format)) {
                    const outputName = basename(filepath);
                    const extname = path.extname(originalFilename ?? '');
                    const result = await UploadImage(filepath, outputName.endsWith(extname) ? outputName : outputName + extname, undefined);
                    return { source: file, result };
                }
                fs.unlink(filepath, () => {});
                return { source: file, result: { name: 'Unsupported image format', message: `Could not upload unsupported file (${originalFilename}). Please convert to an .jpg` } };
            case 'video': {
                const vidFile = file;
                if (format.includes('x-matroska')) {
                    await new Promise(res => {
                        ffmpeg(vidFile.filepath)
                            .videoCodec('copy') // this will copy the data instead of reencode it
                            .save(vidFile.filepath.replace('.mkv', '.mp4'))
                            .on('end', res)
                            .on('error', console.log);
                    });
                    vidFile.filepath = vidFile.filepath.replace('.mkv', '.mp4');
                    format = '.mp4';
                }
                if (format.includes('quicktime')) {
                    let abort = false;
                    await new Promise<void>(res => {
                        // eslint-disable-next-line @typescript-eslint/no-explicit-any
                        ffmpeg.ffprobe(vidFile.filepath, (err: any, metadata: ffmpeg.FfprobeData) => {
                            if (metadata.streams.some(stream => stream.codec_name === 'hevc')) {
                                abort = true;
                            }
                            res();
                        });
                    });
                    if (abort) {
                        // bcz: instead of aborting, we could convert the file using the code below to an mp4.  Problem is that this takes a long time and will clog up the server.
                        // await new Promise(res =>
                        //     ffmpeg(file.path)
                        //         .videoCodec('libx264') // this will copy the data instead of reencode it
                        //         .audioCodec('mp2')
                        //         .save(vidFile.path.replace('.MOV', '.mp4').replace('.mov', '.mp4'))
                        //         .on('end', res)
                        // );
                        // vidFile.path = vidFile.path.replace('.mov', '.mp4').replace('.MOV', '.mp4');
                        // format = '.mp4';
                        fs.unlink(filepath, () => {});
                        return { source: file, result: { name: 'Unsupported video format', message: `Could not upload unsupported file (${originalFilename}). Please convert to an .mp4` } };
                    }
                }
                if (videoFormats.includes(format) || format.includes('.webm')) {
                    return MoveParsedFile(vidFile, Directory.videos);
                }
                fs.unlink(filepath, () => {});
                return { source: vidFile, result: { name: 'Unsupported video format', message: `Could not upload unsupported file (${originalFilename}). Please convert to an .mp4` } };
            }
            case 'application':
                if (applicationFormats.includes(format)) {
                    const val = UploadPdf(file);
                    if (val) return val;
                }
                break;
            case 'audio': {
                const components = format.split(';');
                if (components.length > 1) {
                    [format] = components;
                }
                if (audioFormats.includes(format)) {
                    return UploadAudio(file, format);
                }
                fs.unlink(filepath, () => {});
                return { source: file, result: { name: 'Unsupported audio format', message: `Could not upload unsupported file (${originalFilename}). Please convert to an .mp3` } };
            }
            case 'text':
                if (types[1] === 'csv') {
                    return UploadCsv(file);
                }
                break;
            default:
        }

        console.log(red(`Ignoring unsupported file (${originalFilename}) with upload type (${mimetype}).`));
        fs.unlink(filepath, () => {});
        return { source: file, result: new Error(`Could not upload unsupported file (${originalFilename}) with upload type (${mimetype}).`) };
    }

    export async function buildFileDirectories() {
        if (!existsSync(publicDirectory)) {
            console.error('\nPlease ensure that the following directory exists...\n');
            console.log(publicDirectory);
            process.exit(0);
        }
        if (!existsSync(filesDirectory)) {
            console.error('\nPlease ensure that the following directory exists...\n');
            console.log(filesDirectory);
            process.exit(0);
        }
        const pending = Object.keys(Directory).map(sub => createIfNotExists(`${filesDirectory}/${sub}`));
        return Promise.all(pending);
    }

    export interface RequestedImageSize {
        width: number;
        height: number;
        type: string;
    }

    export interface ImageResizer {
        width: number;
        suffix: SizeSuffix;
    }
}