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import { h, VNode } from "preact";
import { useRef, useState } from "preact/hooks";
const MAX_IMAGE_UPLOAD_SIZE = 1024 * 1024;
export interface FileTypeContent {
content: string;
type: string;
name: string;
}
interface Props {
label: string;
onChange: (v: FileTypeContent | undefined) => void;
}
export function FileButton(props: Props): VNode {
const fileInputRef = useRef<HTMLInputElement>(null);
const [sizeError, setSizeError] = useState(false);
return (
<div>
<button class="button" onClick={(e) => fileInputRef.current?.click()}>
<span>{props.label}</span>
</button>
<input
ref={fileInputRef}
style={{ display: "none" }}
type="file"
onChange={(e) => {
const f: FileList | null = e.currentTarget.files;
if (!f || f.length != 1) return props.onChange(undefined);
if (f[0].size > MAX_IMAGE_UPLOAD_SIZE) {
setSizeError(true);
return props.onChange(undefined);
}
setSizeError(false);
return f[0].arrayBuffer().then((b) => {
const content = new Uint8Array(b).reduce(
(data, byte) => data + String.fromCharCode(byte),
"",
);
return props.onChange({
content,
name: f[0].name,
type: f[0].type,
});
});
}}
/>
{sizeError && (
<p class="help is-danger">File should be smaller than 1 MB</p>
)}
</div>
);
}
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