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import { forwardRef, useEffect, useImperativeHandle, useRef } from "react";
import { View } from "react-native";
import WebView from "react-native-webview";
import { WEBVIEW_FONT_FAMILIES } from "@/lib/readerSettings";
import { useColorScheme } from "@/lib/useColorScheme";
import { ZReaderFontFamily } from "@karakeep/shared/types/users";
const PREVIEW_TEXT =
"The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs. How vexingly quick daft zebras jump!";
export interface ReaderPreviewRef {
updateStyles: (
fontFamily: ZReaderFontFamily,
fontSize: number,
lineHeight: number,
) => void;
}
interface ReaderPreviewProps {
initialFontFamily: ZReaderFontFamily;
initialFontSize: number;
initialLineHeight: number;
}
export const ReaderPreview = forwardRef<ReaderPreviewRef, ReaderPreviewProps>(
({ initialFontFamily, initialFontSize, initialLineHeight }, ref) => {
const webViewRef = useRef<WebView>(null);
const { isDarkColorScheme: isDark } = useColorScheme();
const fontFamily = WEBVIEW_FONT_FAMILIES[initialFontFamily];
const textColor = isDark ? "#e5e7eb" : "#374151";
const bgColor = isDark ? "#000000" : "#ffffff";
useImperativeHandle(ref, () => ({
updateStyles: (
newFontFamily: ZReaderFontFamily,
newFontSize: number,
newLineHeight: number,
) => {
const cssFontFamily = WEBVIEW_FONT_FAMILIES[newFontFamily];
webViewRef.current?.injectJavaScript(`
window.updateStyles("${cssFontFamily}", ${newFontSize}, ${newLineHeight});
true;
`);
},
}));
// Update colors when theme changes
useEffect(() => {
webViewRef.current?.injectJavaScript(`
document.body.style.color = "${textColor}";
document.body.style.background = "${bgColor}";
true;
`);
}, [isDark, textColor, bgColor]);
const html = `
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html, body {
height: 100%;
overflow: hidden;
}
body {
font-family: ${fontFamily};
font-size: ${initialFontSize}px;
line-height: ${initialLineHeight};
color: ${textColor};
background: ${bgColor};
padding: 16px;
word-wrap: break-word;
overflow-wrap: break-word;
}
</style>
<script>
window.updateStyles = function(fontFamily, fontSize, lineHeight) {
document.body.style.fontFamily = fontFamily;
document.body.style.fontSize = fontSize + 'px';
document.body.style.lineHeight = lineHeight;
};
</script>
</head>
<body>
${PREVIEW_TEXT}
</body>
</html>
`;
return (
<View className="h-32 w-full overflow-hidden rounded-lg">
<WebView
ref={webViewRef}
originWhitelist={["*"]}
source={{ html }}
style={{
flex: 1,
backgroundColor: bgColor,
}}
scrollEnabled={false}
showsVerticalScrollIndicator={false}
showsHorizontalScrollIndicator={false}
/>
</View>
);
},
);
ReaderPreview.displayName = "ReaderPreview";
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