import { PDFWorkerMessage } from "./worker"
import { PDFWorker } from "../dist/cache/worker"

const scriptUrlFromFunction = (fn: Function) => {
    const blob = new Blob(["(" + fn.toString() + ")()"], { type: "application/javascript" })
    return URL.createObjectURL(blob)
}

export class PDFWorkerHelper extends Worker {
    constructor() {
        const url = scriptUrlFromFunction(PDFWorker)
        super(url)
    }

    generatePDF(imgURLs: string[], imgType: "svg" | "png", width: number, height: number): Promise<ArrayBuffer> {
        const msg: PDFWorkerMessage = [
            imgURLs,
            imgType,
            width,
            height,
        ]
        this.postMessage(msg)
        return new Promise((resolve) => {
            this.addEventListener("message", (e) => {
                resolve(e.data)
            })
        })
    }
}