QR: render actual QR images with CoreImage; add copy button; keep scanner placeholder for now

bitchat/Views/VerificationViews.swift

@@ -1,17 +1,36 @@
 import SwiftUI
+import CoreImage
+import CoreImage.CIFilterBuiltins
+#if os(iOS)
+import UIKit
+#else
+import AppKit
+#endif
 
 /// Placeholder view to display the user's verification QR payload as text.
 struct MyQRView: View {
     let qrString: String
+
     var body: some View {
         VStack(spacing: 12) {
             Text("Scan to verify me")
                 .font(.system(size: 16, weight: .bold, design: .monospaced))
-            // Placeholder box where a future QR image will go
-            RoundedRectangle(cornerRadius: 8)
-                .stroke(Color.gray.opacity(0.5), lineWidth: 1)
-                .frame(width: 220, height: 220)
-                .overlay(Text("QR PREVIEW\ncoming soon").font(.system(size: 12, design: .monospaced)).multilineTextAlignment(.center).foregroundColor(.gray))
+
+            QRCodeImage(data: qrString, size: 240)
+                .accessibilityLabel("verification QR code")
+
+            HStack(spacing: 8) {
+                Button("Copy Link") {
+                    #if os(iOS)
+                    UIPasteboard.general.string = qrString
+                    #else
+                    NSPasteboard.general.clearContents()
+                    NSPasteboard.general.setString(qrString, forType: .string)
+                    #endif
+                }
+                .buttonStyle(.bordered)
+            }
+
             ScrollView {
                 Text(qrString)
                     .font(.system(size: 10, design: .monospaced))
@@ -19,12 +38,66 @@ struct MyQRView: View {
                     .padding(8)
                     .background(Color.gray.opacity(0.1))
                     .cornerRadius(6)
-            }.frame(maxHeight: 120)
+            }
+            .frame(maxHeight: 120)
         }
         .padding()
     }
 }
 
+// Render a QR code image for a given string using CoreImage
+struct QRCodeImage: View {
+    let data: String
+    let size: CGFloat
+
+    private let context = CIContext()
+    private let filter = CIFilter.qrCodeGenerator()
+
+    var body: some View {
+        Group {
+            if let image = generateImage() {
+                ImageWrapper(image: image)
+                    .interpolation(.none)
+                    .resizable()
+                    .frame(width: size, height: size)
+            } else {
+                RoundedRectangle(cornerRadius: 8)
+                    .stroke(Color.gray.opacity(0.5), lineWidth: 1)
+                    .frame(width: size, height: size)
+                    .overlay(
+                        Text("QR unavailable")
+                            .font(.system(size: 12, design: .monospaced))
+                            .foregroundColor(.gray)
+                    )
+            }
+        }
+    }
+
+    private func generateImage() -> CGImage? {
+        let inputData = Data(data.utf8)
+        filter.message = inputData
+        filter.correctionLevel = "M"
+        guard let outputImage = filter.outputImage else { return nil }
+        let scale = max(1, Int(size / 32))
+        let transformed = outputImage.transformed(by: CGAffineTransform(scaleX: CGFloat(scale), y: CGFloat(scale)))
+        return context.createCGImage(transformed, from: transformed.extent)
+    }
+}
+
+// Platform-specific wrapper to display CGImage in SwiftUI
+struct ImageWrapper: View {
+    let image: CGImage
+    var body: some View {
+        #if os(iOS)
+        let ui = UIImage(cgImage: image)
+        return Image(uiImage: ui)
+        #else
+        let ns = NSImage(cgImage: image, size: .zero)
+        return Image(nsImage: ns)
+        #endif
+    }
+}
+
 /// Placeholder scanner UI; real camera scanning will be added later.
 struct QRScanView: View {
     @State private var input = ""
@@ -52,4 +125,3 @@ struct QRScanView: View {
         .padding()
     }
 }
-