Added csv export functionality

VoiceInk/Services/VoiceInkCSVExportService.swift

@@ -0,0 +1,53 @@
+
+import Foundation
+import AppKit
+import SwiftData
+
+class VoiceInkCSVExportService {
+    
+    func exportTranscriptionsToCSV(transcriptions: [Transcription]) {
+        let csvString = generateCSV(for: transcriptions)
+        
+        let savePanel = NSSavePanel()
+        savePanel.allowedContentTypes = [.commaSeparatedText]
+        savePanel.nameFieldStringValue = "VoiceInk-transcription.csv"
+        
+        savePanel.begin { result in
+            if result == .OK, let url = savePanel.url {
+                do {
+                    try csvString.write(to: url, atomically: true, encoding: .utf8)
+                } catch {
+                    print("Error writing CSV file: \(error)")
+                }
+            }
+        }
+    }
+    
+    private func generateCSV(for transcriptions: [Transcription]) -> String {
+        var csvString = "Original Transcript,Enhanced Transcript,Enhancement Model,Transcription Model,Enhancement Time,Transcription Time,Timestamp,Duration\n"
+        
+        for transcription in transcriptions {
+            let originalText = escapeCSVString(transcription.text)
+            let enhancedText = escapeCSVString(transcription.enhancedText ?? "")
+            let enhancementModel = escapeCSVString(transcription.aiEnhancementModelName ?? "")
+            let transcriptionModel = escapeCSVString(transcription.transcriptionModelName ?? "")
+            let enhancementTime = transcription.enhancementDuration ?? 0
+            let transcriptionTime = transcription.transcriptionDuration ?? 0
+            let timestamp = transcription.timestamp.ISO8601Format()
+            let duration = transcription.duration
+            
+            let row = "\(originalText),\(enhancedText),\(enhancementModel),\(transcriptionModel),\(enhancementTime),\(transcriptionTime),\(timestamp),\(duration)\n"
+            csvString.append(row)
+        }
+        
+        return csvString
+    }
+    
+    private func escapeCSVString(_ string: String) -> String {
+        let escapedString = string.replacingOccurrences(of: "\"", with: "\"\"")
+        if escapedString.contains(",") || escapedString.contains("\n") {
+            return "\"\(escapedString)\""
+        }
+        return escapedString
+    }
+} 

VoiceInk/Views/TranscriptionHistoryView.swift

@@ -10,6 +10,8 @@ struct TranscriptionHistoryView: View {
     @State private var isViewCurrentlyVisible = false
     @State private var showAnalysisView = false
     
+    private let exportService = VoiceInkCSVExportService()
+    
     // Pagination states
     @State private var displayedTranscriptions: [Transcription] = []
     @State private var isLoading = false
@@ -235,6 +237,16 @@ struct TranscriptionHistoryView: View {
             }
             .buttonStyle(.borderless)
             
+            Button(action: {
+                exportService.exportTranscriptionsToCSV(transcriptions: Array(selectedTranscriptions))
+            }) {
+                HStack(spacing: 4) {
+                    Image(systemName: "square.and.arrow.up")
+                    Text("Export")
+                }
+            }
+            .buttonStyle(.borderless)
+            
             Button(action: {
                 showDeleteConfirmation = true
             }) {