QR Code

import { to_readable, to_writable } from "@sveu/shared"

import QRCode from "qrcode"

/**
 * Wrapper for qrcode.
 *
 * @param text - The text to encode.
 *
 * @see options in https://github.com/soldair/node-qrcode#qr-code-options
 *
 * @returns
 * - output - Readable store of the generated QR code.
 * - error  - Error if one occurred.
 * - pending - Whether the QR code is being generated.
 */
export function qrcode(text: string, options?: QRCode.QRCodeToDataURLOptions) {
    const output = to_writable<string>("")

    const error = to_writable<boolean | unknown>(false)

    const pending = to_writable(true)

    /** Generate the QR code. */
    async function generate() {
        pending.set(true)

        error.set(false)

        try {
            output.set(await QRCode.toDataURL(text, options))
        } catch (e) {
            error.set(e)
        } finally {
            pending.set(false)
        }
    }

    generate()

    return {
        output: to_readable(output),
        error: to_readable(error),
        pending: to_readable(pending),
    }
}