// Signup API endpoint - app/api/auth/signup/route.ts
const { email, firstName, lastName, password } = await request.json()

// Validate password length
if (password.length < 6) {
  return NextResponse.json(
    { error: "Password must be at least 6 characters" },
    { status: 400 }
  )
}

// Create user with Supabase Auth
const { data, error } = await supabase.auth.signUp({
  email,
  password,
  options: {
    data: {
      first_name: firstName,
      last_name: lastName,
    },
  },
})

// Insert user profile
if (data.user) {
  await supabase.from('users').insert({
    id: data.user.id,
    email: email,
    first_name: firstName,
    last_name: lastName,
    name: `${firstName} ${lastName}`,
    created_at: new Date().toISOString()
  })
  
  // Send welcome email
  sendWelcomeEmail(email, firstName)
}

// Dashboard structure - app/dashboard/page.tsx
export default function DashboardPage() {
  const [user, setUser] = useState<any>(null)
  
  // Fetch authenticated user
  const supabase = createClient()
  const { data: { user: authUser } } = await supabase.auth.getUser()
  
  // Fetch user profile from profiles table
  const { data: profileData } = await supabase
    .from('profiles')
    .select('id, full_name, first_name, last_name, avatar_url')
    .eq('id', authUser.id)
    .maybeSingle()
  
  return (
    <UnifiedDashboard 
      user={user} 
      onOpenGenerator={() => setShowGenerator(true)} 
    />
  )
}

// Generator configuration - lib/generators-config.ts
export const generators = [
  {
    id: "quiz-generator",
    name: "Quiz Generator",
    slug: "quiz-generator",
    description: "Create customized quizzes instantly with AI-powered generation",
    shortDescription: "Generate quizzes from any topic",
    icon: "BookOpen",
    category: "Learning",
    toolPath: "/tools/quiz-generator",
    features: ["Multiple choice questions", "Instant feedback", "Adjustable difficulty"],
    useCases: ["Test your understanding", "Practice for exams", "Group study sessions"],
    buttonText: "Make a Quiz",
  },
  {
    id: "flashcard-generator",
    name: "Flashcard Generator",
    slug: "flashcard-generator",
    description: "Create beautiful flashcards to master any subject with AI",
    icon: "Card",
    category: "Memorization",
    toolPath: "/tools/flashcard-generator",
    buttonText: "Make Flashcards",
  },
  // Additional generators...
]

// Credit management system ensures fair usage
const GENERATION_COST = 20

// Atomic credit deduction
async function deductCredits(userId: string, amount: number) {
  const { data, error } = await supabase
    .from('users')
    .update({ credits: sql`credits - ${amount}` })
    .eq('id', userId)
    .select('credits')
    .single()
  
  // Log credit usage
  await supabase.from('credit_usage').insert({
    userId,
    amount: -amount,
    type: 'generation',
    description: 'AI content generation',
    createdAt: new Date().toISOString()
  })
  
  return data.credits
}

// Quiz interaction features
- Click through questions at your own pace
- Select your answer and get instant feedback
- See explanations for correct and incorrect answers
- Track your score in real-time
- Review missed questions at the end