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/*
This file is part of GNU Taler
(C) 2022 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import { classifyTalerUri, TalerUriType } from "@gnu-taler/taler-util";
import { styled } from "@linaria/react";
import { Fragment, h, VNode } from "preact";
import { Ref, useEffect, useRef, useState } from "preact/hooks";
import QrScanner from "qr-scanner";
import { Alert } from "../mui/Alert.js";
import { Button } from "../mui/Button.js";
import { TextField } from "../mui/TextField.js";
const QrVideo = styled.video`
width: 80%;
margin-left: auto;
margin-right: auto;
padding: 8px;
background-color: black;
`;
const Container = styled.div`
display: flex;
flex-direction: column;
& > * {
margin-bottom: 20px;
}
`;
interface Props {
onDetected: (url: string) => void;
}
export function QrReaderPage({ onDetected }: Props): VNode {
const videoRef = useRef<HTMLVideoElement>(null);
// const imageRef = useRef<HTMLImageElement>(null);
const qrScanner = useRef<QrScanner | null>(null);
const [value, onChange] = useState("");
const [active, setActive] = useState(false);
function start(): void {
qrScanner.current!.start();
onChange("");
setActive(true);
}
function stop(): void {
qrScanner.current!.stop();
setActive(false);
}
function check(v: string) {
return (
v.startsWith("taler://") && classifyTalerUri(v) !== TalerUriType.Unknown
);
}
useEffect(() => {
if (!videoRef.current) {
console.log("vide was not ready");
return;
}
const elem = videoRef.current;
setTimeout(() => {
qrScanner.current = new QrScanner(
elem,
({ data, cornerPoints }) => {
if (check(data)) {
onDetected(data);
return;
}
onChange(data);
stop();
},
{
maxScansPerSecond: 5, //default 25
highlightScanRegion: true,
},
);
start();
}, 1);
return () => {
qrScanner.current?.destroy();
};
}, []);
const isValid = check(value);
return (
<Container>
{/* <InputFile onChange={(f) => scanImage(imageRef, f)}>
Read QR from file
</InputFile>
<div ref={imageRef} /> */}
<QrVideo ref={videoRef} />
<TextField
label="Taler URI"
variant="standard"
fullWidth
value={value}
onChange={onChange}
/>
{isValid && (
<Button variant="contained" onClick={async () => onDetected(value)}>
Open
</Button>
)}
{!active && !isValid && (
<Fragment>
<Alert severity="error">
URI is not valid. Taler URI should start with `taler://`
</Alert>
<Button variant="contained" onClick={async () => start()}>
Try another
</Button>
</Fragment>
)}
</Container>
);
}
async function scanImage(
imageRef: Ref<HTMLImageElement>,
image: string,
): Promise<void> {
const imageEl = new Image();
imageEl.src = image;
imageEl.width = 200;
imageRef.current!.appendChild(imageEl);
QrScanner.scanImage(image, {
alsoTryWithoutScanRegion: true,
})
.then((result) => console.log(result))
.catch((error) => console.log(error || "No QR code found."));
}
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