From f7032e37c8a93f6d6be2cb983d0b5d8ec170678d Mon Sep 17 00:00:00 2001
From: Potenz <vishnu10kumar11@gmail.com>
Date: Tue, 30 Sep 2025 01:53:44 +0530
Subject: [PATCH] feat(preview modal added)

---
 .../documents/file-preview-modal.tsx          | 229 ++++++++++++++++++
 apps/Frontend/src/pages/documents-page.tsx    |  61 +++--
 2 files changed, 258 insertions(+), 32 deletions(-)
 create mode 100644 apps/Frontend/src/components/documents/file-preview-modal.tsx

diff --git a/apps/Frontend/src/components/documents/file-preview-modal.tsx b/apps/Frontend/src/components/documents/file-preview-modal.tsx
new file mode 100644
index 0000000..231b21d
--- /dev/null
+++ b/apps/Frontend/src/components/documents/file-preview-modal.tsx
@@ -0,0 +1,229 @@
+import React, { useEffect, useState } from "react";
+import { apiRequest } from "@/lib/queryClient";
+import { toast } from "@/hooks/use-toast";
+import { Maximize2, Minimize2, Download, X } from "lucide-react";
+
+type Props = {
+  fileId: number | null;
+  isOpen: boolean;
+  onClose: () => void;
+  initialFileName?: string | null;
+};
+
+export default function DocumentsFilePreviewModal({
+  fileId,
+  isOpen,
+  onClose,
+  initialFileName,
+}: Props) {
+  const [loading, setLoading] = useState(false);
+  const [mime, setMime] = useState<string | null>(null);
+  const [fileName, setFileName] = useState<string | null>(
+    initialFileName ?? null
+  );
+  const [blobUrl, setBlobUrl] = useState<string | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [isFullscreen, setIsFullscreen] = useState(false);
+
+  useEffect(() => {
+    if (!isOpen || !fileId) return;
+    let cancelled = false;
+    let createdUrl: string | null = null;
+
+    async function load() {
+      setLoading(true);
+      setError(null);
+      setMime(null);
+      setFileName(initialFileName ?? null);
+      setBlobUrl(null);
+
+      try {
+        // Fetch the file bytes using the Documents API endpoint (returns raw bytes)
+        const res = await apiRequest(
+          "GET",
+          `/api/documents/pdf-files/${fileId}`
+        );
+
+        if (!res.ok) {
+          // try to parse error message from JSON body
+          let msg = `Preview request failed (${res.status})`;
+          try {
+            const j = await res.json();
+            msg = j?.message ?? msg;
+          } catch {}
+          throw new Error(msg);
+        }
+
+        // try to infer MIME from headers; fallback to application/pdf
+        const contentType =
+          res.headers.get("content-type") ?? "application/pdf";
+        setMime(contentType);
+        // If server provided filename in headers (Content-Disposition), we could parse it here.
+        // Use initialFileName if provided, otherwise keep unset until download.
+        if (!fileName && initialFileName) setFileName(initialFileName);
+
+        const arrayBuffer = await res.arrayBuffer();
+        if (cancelled) return;
+        const blob = new Blob([arrayBuffer], { type: contentType });
+        createdUrl = URL.createObjectURL(blob);
+        setBlobUrl(createdUrl);
+      } catch (err: any) {
+        if (!cancelled) setError(err?.message ?? String(err));
+      } finally {
+        if (!cancelled) setLoading(false);
+      }
+    }
+
+    load();
+
+    return () => {
+      cancelled = true;
+      if (createdUrl) URL.revokeObjectURL(createdUrl);
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [isOpen, fileId]);
+
+  useEffect(() => {
+    function onKey(e: KeyboardEvent) {
+      if (e.key === "Escape") onClose();
+    }
+    if (isOpen) {
+      window.addEventListener("keydown", onKey);
+      return () => window.removeEventListener("keydown", onKey);
+    }
+  }, [isOpen, onClose]);
+
+  if (!isOpen) return null;
+
+  async function handleDownload() {
+    if (!fileId) return;
+    try {
+      const res = await apiRequest("GET", `/api/documents/pdf-files/${fileId}`);
+      if (!res.ok) {
+        const j = await res.json().catch(() => ({}));
+        throw new Error(j?.message || `Download failed (${res.status})`);
+      }
+      const arrayBuffer = await res.arrayBuffer();
+      const blob = new Blob([arrayBuffer], {
+        type: mime ?? "application/octet-stream",
+      });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement("a");
+      a.href = url;
+      a.download = fileName ?? `file-${fileId}`;
+      document.body.appendChild(a);
+      a.click();
+      a.remove();
+      setTimeout(() => URL.revokeObjectURL(url), 5000);
+    } catch (err: any) {
+      toast({
+        title: "Download failed",
+        description: err?.message ?? String(err),
+        variant: "destructive",
+      });
+    }
+  }
+
+  const containerBase =
+    "bg-white rounded-md p-3 flex flex-col overflow-hidden shadow-xl";
+  const sizeClass = isFullscreen
+    ? "w-[95vw] h-[95vh]"
+    : "w-[min(1200px,95vw)] h-[85vh]";
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black bg-opacity-60 p-4">
+      <div className={`${containerBase} ${sizeClass} max-w-full max-h-full`}>
+        <div className="flex items-start justify-between gap-3 pb-2 border-b">
+          <div className="min-w-0">
+            <h3 className="text-lg font-semibold truncate">
+              {fileName ?? `File #${fileId}`}
+            </h3>
+            <div className="text-sm text-gray-500 truncate">{mime ?? ""}</div>
+          </div>
+
+          <div className="flex items-center gap-2">
+            <button
+              onClick={() => setIsFullscreen((s) => !s)}
+              title={isFullscreen ? "Exit fullscreen" : "Fullscreen"}
+              className="p-2 rounded hover:bg-gray-100"
+            >
+              {isFullscreen ? (
+                <Minimize2 className="w-4 h-4" />
+              ) : (
+                <Maximize2 className="w-4 h-4" />
+              )}
+            </button>
+
+            <button
+              onClick={handleDownload}
+              title="Download"
+              className="p-2 rounded hover:bg-gray-100"
+            >
+              <Download className="w-4 h-4" />
+            </button>
+
+            <button
+              onClick={onClose}
+              title="Close"
+              className="p-2 rounded hover:bg-gray-100"
+            >
+              <X className="w-4 h-4" />
+            </button>
+          </div>
+        </div>
+
+        <div className="flex-1 overflow-auto mt-3">
+          {loading && (
+            <div className="w-full h-full flex items-center justify-center">
+              Loading preview…
+            </div>
+          )}
+          {error && <div className="text-red-600">{error}</div>}
+
+          {!loading && !error && blobUrl && mime?.startsWith("image/") && (
+            <div className="flex items-center justify-center w-full h-full">
+              <img
+                src={blobUrl}
+                alt={fileName ?? ""}
+                className="max-w-full max-h-full object-contain"
+              />
+            </div>
+          )}
+
+          {!loading &&
+            !error &&
+            blobUrl &&
+            (mime === "application/pdf" || mime?.endsWith("/pdf")) && (
+              <div className="w-full h-full">
+                <iframe
+                  src={blobUrl}
+                  title={fileName ?? `PDF ${fileId}`}
+                  className="w-full h-full border-0"
+                />
+              </div>
+            )}
+
+          {!loading &&
+            !error &&
+            blobUrl &&
+            !mime?.startsWith("image/") &&
+            !mime?.includes("pdf") && (
+              <div className="p-4">
+                <p>Preview not available for this file type.</p>
+                <p className="mt-2">
+                  <a
+                    href={blobUrl}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="underline"
+                  >
+                    Open raw
+                  </a>
+                </p>
+              </div>
+            )}
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/apps/Frontend/src/pages/documents-page.tsx b/apps/Frontend/src/pages/documents-page.tsx
index 72a45e6..d91181d 100644
--- a/apps/Frontend/src/pages/documents-page.tsx
+++ b/apps/Frontend/src/pages/documents-page.tsx
@@ -22,6 +22,7 @@ import {
   PaginationNext,
   PaginationPrevious,
 } from "@/components/ui/pagination";
+import DocumentsFilePreviewModal from "@/components/documents/file-preview-modal";
 
 export default function DocumentsPage() {
   const [selectedPatient, setSelectedPatient] = useState<Patient | null>(null);
@@ -37,7 +38,11 @@ export default function DocumentsPage() {
   >(null);
 
   // PDF view state - viewing / downloading
-  const [fileBlobUrl, setFileBlobUrl] = useState<string | null>(null);
+  const [previewFileId, setPreviewFileId] = useState<number | null>(null);
+  const [isPreviewOpen, setIsPreviewOpen] = useState(false);
+  const [previewFileNameHint, setPreviewFileNameHint] = useState<string | null>(
+    null
+  );
   const [currentPdf, setCurrentPdf] = useState<PdfFile | null>(null);
 
   // Delete dialog
@@ -49,7 +54,11 @@ export default function DocumentsPage() {
     setLimit(5);
     setCurrentPage(1);
     setTotalForExpandedGroup(null);
-    setFileBlobUrl(null);
+
+    // close the preview modal and clear any preview hints
+    setIsPreviewOpen(false);
+    setPreviewFileId(null);
+    setPreviewFileNameHint(null);
   }, [selectedPatient]);
 
   // FETCH GROUPS for patient (includes `category` on each group)
@@ -151,12 +160,10 @@ export default function DocumentsPage() {
     }
   };
 
-  const handleViewPdf = async (pdfId: number) => {
-    const res = await apiRequest("GET", `/api/documents/pdf-files/${pdfId}`);
-    const arrayBuffer = await res.arrayBuffer();
-    const blob = new Blob([arrayBuffer], { type: "application/pdf" });
-    const url = URL.createObjectURL(blob);
-    setFileBlobUrl(url);
+  const handleViewPdf = (pdfId: number, filename?: string) => {
+    setPreviewFileNameHint(filename ?? null);
+    setPreviewFileId(pdfId);
+    setIsPreviewOpen(true);
   };
 
   const handleDownloadPdf = async (pdfId: number, filename: string) => {
@@ -309,7 +316,10 @@ export default function DocumentsPage() {
                                               variant="ghost"
                                               size="sm"
                                               onClick={() =>
-                                                handleViewPdf(Number(pdf.id))
+                                                handleViewPdf(
+                                                  Number(pdf.id),
+                                                  pdf.filename
+                                                )
                                               }
                                             >
                                               <Eye className="w-4 h-4" />
@@ -437,29 +447,16 @@ export default function DocumentsPage() {
           </Card>
         )}
 
-        {fileBlobUrl && (
-          <Card>
-            <CardHeader className="flex justify-between items-center">
-              <CardTitle>Viewing PDF</CardTitle>
-              <Button
-                variant="outline"
-                className="ml-auto text-red-600 border-red-500 hover:bg-red-100 hover:border-red-600"
-                onClick={() => {
-                  setFileBlobUrl(null);
-                }}
-              >
-                ✕ Close
-              </Button>
-            </CardHeader>
-            <CardContent>
-              <iframe
-                src={fileBlobUrl}
-                className="w-full h-[80vh] border rounded"
-                title="PDF Viewer"
-              />
-            </CardContent>
-          </Card>
-        )}
+        <DocumentsFilePreviewModal
+          fileId={previewFileId}
+          isOpen={isPreviewOpen}
+          onClose={() => {
+            setIsPreviewOpen(false);
+            setPreviewFileId(null);
+            setPreviewFileNameHint(null);
+          }}
+          initialFileName={previewFileNameHint}
+        />
 
         <Card>
           <CardHeader>