Implement audio player component with HTML5 audio and download functionality

frontend/src/App.tsx

@@ -2,8 +2,9 @@ import { useState } from 'react'
 import './App.css'
 import TextInputSection from './components/TextInputSection'
 import VoiceAssignmentSection from './components/VoiceAssignmentSection'
+import AudioPlayerSection from './components/AudioPlayerSection'
 import type { Role } from './api/tts'
-import { detectRoles } from './api/tts'
+import { detectRoles, generateAudiobook } from './api/tts'
 
 function App() {
   const [text, setText] = useState('')
@@ -15,6 +16,7 @@ function App() {
   const [speed, setSpeed] = useState(1.0) // Default: 1.0x
   const [isGenerating, setIsGenerating] = useState(false)
   const [error, setError] = useState<string | null>(null)
+  const [audioUrl, setAudioUrl] = useState<string | null>(null)
 
   const handleTextChange = (newText: string) => {
     setText(newText)
@@ -63,26 +65,46 @@ function App() {
     setError(null)
     
     try {
-      // TODO: Implement audio generation
-      console.log('Generating audiobook with:', {
+      // Convert voice assignments to the format expected by the API
+      const rolesArray = Array.from(voiceAssignments.entries()).map(([id, voice]) => ({
+        id,
+        voice
+      }))
+      
+      // Generate the audiobook
+      const audioBlob = await generateAudiobook({
         text,
-        language,
-        voiceAssignments: Array.from(voiceAssignments.entries()),
+        lang: language,
+        roles: rolesArray,
         speed
       })
       
-      // Placeholder - will be implemented in later tasks
-      setTimeout(() => {
-        setIsGenerating(false)
-        setPhase('generated')
-      }, 1000)
+      // Create a blob URL for the audio
+      const url = URL.createObjectURL(audioBlob)
+      setAudioUrl(url)
+      
+      // Move to generated phase
+      setPhase('generated')
     } catch (err) {
       setError(err instanceof Error ? err.message : 'Failed to generate audiobook')
       console.error('Generation error:', err)
+    } finally {
       setIsGenerating(false)
     }
   }
 
+  const handleDownload = () => {
+    if (!audioUrl) return
+    
+    // Create a temporary anchor element to trigger download
+    const link = document.createElement('a')
+    link.href = audioUrl
+    link.download = 'audiobook.wav'
+    document.body.appendChild(link)
+    link.click()
+    document.body.removeChild(link)
+  }
+
   // Check if all roles have assigned voices
   const allRolesAssigned = roles.length > 0 && roles.every(role => voiceAssignments.has(role.id))
 
@@ -122,10 +144,11 @@ function App() {
           />
         )}
 
-        {phase === 'generated' && (
-          <div className="text-center">
-            <p>Audio player phase (to be implemented)</p>
-          </div>
+        {phase === 'generated' && audioUrl && (
+          <AudioPlayerSection
+            audioUrl={audioUrl}
+            onDownload={handleDownload}
+          />
         )}
       </div>
     </div>

frontend/src/components/AudioPlayerSection.tsx

@@ -0,0 +1,36 @@
+interface AudioPlayerSectionProps {
+  audioUrl: string;
+  onDownload: () => void;
+}
+
+export default function AudioPlayerSection({
+  audioUrl,
+  onDownload
+}: AudioPlayerSectionProps) {
+  return (
+    <div className="w-full max-w-4xl mx-auto p-6">
+      <h2 className="text-2xl font-bold mb-6">Your Audiobook is Ready!</h2>
+      
+      <div className="bg-white rounded-lg shadow-md p-6 mb-6">
+        <h3 className="text-lg font-semibold mb-4">Listen to your audiobook</h3>
+        <audio
+          controls
+          src={audioUrl}
+          className="w-full"
+          preload="metadata"
+        >
+          Your browser does not support the audio element.
+        </audio>
+      </div>
+
+      <div className="flex justify-center">
+        <button
+          onClick={onDownload}
+          className="px-6 py-3 bg-green-600 hover:bg-green-700 text-white font-semibold rounded-lg transition-colors cursor-pointer"
+        >
+          Download audiobook
+        </button>
+      </div>
+    </div>
+  );
+}