From 9f235582631676b20cc49839dedfb2b9a500f3e5 Mon Sep 17 00:00:00 2001
From: Lazaro Alonso <lazarus.alon@gmail.com>
Date: Tue, 13 Jan 2026 09:25:49 +0100
Subject: [PATCH] accept all, validate later

---
 .../components/loading/LocalNetCDFMeta.tsx    | 47 +++++++++----
 docs/next-js/components/ui/alert.tsx          | 66 +++++++++++++++++++
 2 files changed, 102 insertions(+), 11 deletions(-)
 create mode 100644 docs/next-js/components/ui/alert.tsx

diff --git a/docs/next-js/components/loading/LocalNetCDFMeta.tsx b/docs/next-js/components/loading/LocalNetCDFMeta.tsx
index 3c18491..b349387 100644
--- a/docs/next-js/components/loading/LocalNetCDFMeta.tsx
+++ b/docs/next-js/components/loading/LocalNetCDFMeta.tsx
@@ -3,40 +3,56 @@
 import React, { ChangeEvent, useState } from 'react';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
-// import { MetaNetCDFAccordion } from './MetaNetCDFAccordion';
-import { MetaNetCDFButtons } from './MetaNetCDFButtons';
+import {
+  Alert,
+  AlertDescription,
+  AlertTitle,
+} from '@/components/ui/alert';
+import { Terminal } from 'lucide-react';
 
+import { MetaNetCDFButtons } from './MetaNetCDFButtons';
 import { NetCDF4 } from '@earthyscience/netcdf4-wasm';
 import BrowzarrCTA from './BrowzarrCTA';
+
+const NETCDF_EXT_REGEX = /\.(nc|netcdf|nc3|nc4)$/i;
+
 const LocalNetCDFMeta = () => {
   const [variables, setVariables] = useState<Record<string, unknown> | null>(null);
   const [attributes, setAttributes] = useState<Record<string, unknown> | null>(null);
   const [metadata, setMetadata] = useState<Record<string, unknown>[] | null>(null);
+  const [error, setError] = useState<string | null>(null);
 
   const handleFileSelect = async (
     event: ChangeEvent<HTMLInputElement>
   ) => {
+    setError(null);
+
     const files = event.target.files;
     if (!files || files.length === 0) return;
 
     const file = files[0];
 
+    // Manual validation (iOS-safe)
+    if (!NETCDF_EXT_REGEX.test(file.name)) {
+      setError('Please select a valid NetCDF (.nc, .netcdf, .nc3, .nc4) file.');
+      return;
+    }
+
     try {
       const data = await NetCDF4.fromBlobLazy(file);
 
-      const [variables, attrs, metadata] = await Promise.all([
+      const [vars, attrs, meta] = await Promise.all([
         data.getVariables(),
         data.getGlobalAttributes(),
         data.getFullMetadata(),
       ]);
 
-      setVariables(variables);
+      setVariables(vars);
       setAttributes(attrs);
-      setMetadata(metadata);
-
-    } catch (error) {
-      console.error('Error loading NetCDF file:', error);
-      alert('Failed to load NetCDF file. Check console for details.');
+      setMetadata(meta);
+    } catch (err) {
+      console.error('Error loading NetCDF file:', err);
+      setError('Failed to load NetCDF file. Check console for details.');
     }
   };
 
@@ -52,11 +68,20 @@ const LocalNetCDFMeta = () => {
       <Input
         id="netcdf-file"
         type="file"
-        accept=".nc,.netcdf,.nc3,.nc4"
         onChange={handleFileSelect}
         className="cursor-pointer"
       />
-      
+
+      {error && (
+        <Alert variant="destructive">
+          <Terminal className="h-4 w-4" />
+          <AlertTitle>Hey!</AlertTitle>
+          <AlertDescription>
+            {error}
+          </AlertDescription>
+        </Alert>
+      )}
+
       {variables && attributes && metadata && (
         <div className="justify-self-center">
           <MetaNetCDFButtons
diff --git a/docs/next-js/components/ui/alert.tsx b/docs/next-js/components/ui/alert.tsx
new file mode 100644
index 0000000..1421354
--- /dev/null
+++ b/docs/next-js/components/ui/alert.tsx
@@ -0,0 +1,66 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/lib/utils"
+
+const alertVariants = cva(
+  "relative w-full rounded-lg border px-4 py-3 text-sm grid has-[>svg]:grid-cols-[calc(var(--spacing)*4)_1fr] grid-cols-[0_1fr] has-[>svg]:gap-x-3 gap-y-0.5 items-start [&>svg]:size-4 [&>svg]:translate-y-0.5 [&>svg]:text-current",
+  {
+    variants: {
+      variant: {
+        default: "bg-card text-card-foreground",
+        destructive:
+          "text-destructive bg-card [&>svg]:text-current *:data-[slot=alert-description]:text-destructive/90",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Alert({
+  className,
+  variant,
+  ...props
+}: React.ComponentProps<"div"> & VariantProps<typeof alertVariants>) {
+  return (
+    <div
+      data-slot="alert"
+      role="alert"
+      className={cn(alertVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+function AlertTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-title"
+      className={cn(
+        "col-start-2 line-clamp-1 min-h-4 font-medium tracking-tight",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDescription({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-description"
+      className={cn(
+        "text-muted-foreground col-start-2 grid justify-items-start gap-1 text-sm [&_p]:leading-relaxed",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Alert, AlertTitle, AlertDescription }