importScripts('cdimage.js');

declare function postMessage(data: any, transfers:any): void;

class Installer {
    private imgFile:File;
    private cueFile:File;
    private imageReader:CDImageReader;

    constructor() {
        addEventListener('message', this.onMessage.bind(this));
    }

    private onMessage(evt: MessageEvent) {
        switch (evt.data.command) {
        case 'setFile':
            this.setFile(evt.data.file);
            var imgName = this.imgFile && this.imgFile.name;
            var cueName = this.cueFile && this.cueFile.name;
            postMessage({command:'readyState', img:imgName, cue:cueName});
            break;
        case 'extractFiles':
            if (this.ready())
                this.extractFiles();
            break;
        case 'getTrack':
            if (this.ready())
                this.getTrack(evt.data.track);
            break;
        }
    }

    private setFile(file:File) {
        var name = file.name.toLowerCase();
        if (name.endsWith('.img') || name.endsWith('.mdf'))
            this.imgFile = file;
        else if (name.endsWith('.cue') || name.endsWith('.mds'))
            this.cueFile = file;
        if (this.imgFile && this.cueFile) {
            if (this.cueFile.name.endsWith('.cue'))
                this.imageReader = new ImgCueReader(this.imgFile, this.cueFile);
            else
                this.imageReader = new MdfMdsReader(this.imgFile, this.cueFile);
        }
    }

    private ready(): boolean {
        return !!this.imageReader;
    }

    private extractFiles() {
        var isofs = new ISO9660FileSystem(this.imageReader);
        //this.walk(isofs, isofs.rootDir(), '/');
        var gamedata = isofs.getDirEnt('gamedata', isofs.rootDir());
        if (!gamedata) {
            postMessage({command:'error', message:'インストールできません。GAMEDATAフォルダが見つかりません。'});
            return;
        }
        var files: any = {};
        var transfers = [];
        for (var e of isofs.readDir(gamedata)) {
            if (e.name.toLowerCase().endsWith('.ald')) {
                var buffer = new ArrayBuffer(e.size);
                var uint8 = new Uint8Array(buffer);
                var ptr = 0;
                isofs.readFile(e, (bufs) => {
                    for (var buf of bufs) {
                        uint8.set(buf, ptr);
                        ptr += buf.byteLength;
                    }
                });
                if (ptr != e.size)
                    throw('expected ' + e.size + ' bytes, but read ' + ptr + 'bytes');
                files[e.name] = buffer;
                transfers.push(buffer);
            }
        }
        postMessage({command: 'extractFiles',
                     volumeLabel: isofs.volumeLabel(),
                     files: files}, transfers);
    }

    private walk(isofs:ISO9660FileSystem, dir:DirEnt, dirname:string) {
        for (var e of isofs.readDir(dir)) {
            if (e.name != '\0' && e.name != '\x01') {
                console.log(dirname + e.name);
                if (e.isDirectory)
                    this.walk(isofs, e, dirname + e.name + '/');
            }
        }
    }

    private getTrack(track:number) {
        var blob = this.imageReader.extractTrack(track);
        postMessage({command:'complete', track:track, wav:blob});
    }
}

var installer = new Installer();