import archiver from "archiver";
import { createWriteStream } from "fs";
import { Observable } from "rxjs";
import recursive from "recursive-readdir";
import * as _path from "path";
import { Progression } from "main/helpers/fs.helpers";

export class Archive {
    private archive: archiver.Archiver;
    private readonly output: string;

    private readonly directories: string[] = [];
    private readonly files: string[] = [];

    constructor(output: string, options?: archiver.ArchiverOptions) {
        this.output = output;
        this.initArchive(options);
    }

    private initArchive(options?: archiver.ArchiverOptions): void {
        const defaultOptions: archiver.ArchiverOptions = {
            zlib: { level: 9 },
        };

        this.archive = archiver("zip", { ...defaultOptions, ...options });
    }

    private async loadTotalFiles(): Promise<number> {
        let totalFiles = this.files.length;
        for (const path of this.directories) {
            const files = await recursive(path);
            totalFiles += files.length;
        }
        return totalFiles;
    }

    public addDirectory(path: string, destPath?: string | false): void {
        this.directories.push(path);
        this.archive.directory(path, destPath ?? _path.basename(path));
    }

    public addFile(path: string, destPath?: string): void {
        this.files.push(path);
        destPath ||= _path.basename(path);
        this.archive.file(path, { name: destPath });
    }

    public finalize(): Observable<Progression<string>> {
        const progress: Progression<string> = {
            total: 0,
            current: 0,
            data: this.output,
        };

        return new Observable<Progression<string>>(observer => {
            (async () => {
                progress.total = await this.loadTotalFiles();

                this.archive.on("entry", e => {
                    if (e.stats.isDirectory()) {
                        return;
                    }
                    progress.current++;
                    observer.next(progress);
                });

                this.archive.pipe(createWriteStream(this.output));

                this.archive.on("error", err => observer.error(err));
                this.archive.finalize().then(() => observer.complete());
            })();
        });
    }
}