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import React, { useEffect, useMemo, useState } from "react";
import { ActivityIndicator, StyleSheet, View } from "react-native";
import ReactNativeBlobUtil from "react-native-blob-util";
import Pdf from "react-native-pdf";
import { Text } from "@/components/ui/Text";
import { useQuery } from "@tanstack/react-query";
import { useColorScheme } from "nativewind";
interface PDFViewerProps {
source: string;
headers?: Record<string, string>;
}
export function PDFViewer({ source, headers }: PDFViewerProps) {
const [pdfRenderError, setPdfRenderError] = useState<string | null>(null);
const { colorScheme } = useColorScheme();
const isDark = colorScheme === "dark";
const colors = {
background: isDark ? "#000" : "#fff",
foreground: isDark ? "#fff" : "#000",
mutedForeground: isDark ? "#888" : "#666",
};
const {
data: localPath,
isLoading,
error: downloadError,
} = useQuery({
queryKey: ["pdf", source],
queryFn: async () => {
// Create a temporary filename
const fileName = `temp_${Date.now()}.pdf`;
const { dirs } = ReactNativeBlobUtil.fs;
const path = `${dirs.DocumentDir}/${fileName}`;
const response = await ReactNativeBlobUtil.config({
fileCache: true,
path,
}).fetch("GET", source, headers ?? {});
return response.path();
},
enabled: !!source,
});
// Merge download and render errors
const error = useMemo(() => {
if (downloadError) {
let errorMessage = "Failed to download PDF";
if (downloadError.message.includes("Network request failed")) {
errorMessage = "Network error. Please check your connection.";
} else if (
downloadError.message.includes("401") ||
downloadError.message.includes("403")
) {
errorMessage = "Authentication failed. Please sign in again.";
} else if (downloadError.message.includes("404")) {
errorMessage = "PDF not found.";
}
return errorMessage;
}
if (pdfRenderError) {
return pdfRenderError;
}
return null;
}, [downloadError, pdfRenderError]);
// Cleanup function to remove temporary file on unmount
useEffect(() => {
return () => {
if (localPath) {
ReactNativeBlobUtil.fs.unlink(localPath).catch(() => ({}));
}
};
}, [source, headers]);
if (error) {
return (
<View style={[styles.container, { backgroundColor: colors.background }]}>
<Text style={[styles.errorText, { color: colors.foreground }]}>
{error}
</Text>
</View>
);
}
if (isLoading || !localPath) {
return (
<View style={[styles.container, { backgroundColor: colors.background }]}>
<View style={styles.loadingContainer}>
<ActivityIndicator size="large" color={colors.foreground} />
<Text style={[styles.loadingText, { color: colors.mutedForeground }]}>
Downloading PDF...
</Text>
</View>
</View>
);
}
return (
<View style={[styles.container, { backgroundColor: colors.background }]}>
<Pdf
style={StyleSheet.absoluteFillObject}
source={{ uri: `file://${localPath}`, cache: true }}
spacing={16}
maxScale={3}
onLoadComplete={() => ({})}
onError={() => setPdfRenderError("Failed to render PDF")}
trustAllCerts={false}
renderActivityIndicator={() => (
<ActivityIndicator size="large" color={colors.foreground} />
)}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
loadingContainer: {
...StyleSheet.absoluteFillObject,
justifyContent: "center",
alignItems: "center",
zIndex: 1,
},
loadingText: {
marginTop: 12,
fontSize: 16,
},
errorText: {
fontSize: 16,
textAlign: "center",
padding: 20,
},
});
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