Implement profile management (task 14)

- Add updateProfile and updatePassword server actions
- Add getUserProfile function with sensitive data protection
- Create ProfileForm component for name and email updates
- Create PasswordChangeForm component with current password verification
- Create profile page at /profile with all profile management features
- Add profile and invitations navigation links to main page
- Implement email uniqueness validation
- Implement password hashing on password change

Requirements: 7.1, 7.2, 7.3, 7.4, 7.5

.kiro/specs/user-auth-and-sharing/tasks.md

@@ -200,7 +200,7 @@
   - **Property 24: Permission update enforcement**
   - **Validates: Requirements 6.5**
 
-- [ ] 13. Create sharing UI components
+- [x] 13. Create sharing UI components
   - Build InvitationCard component
   - Build CollaboratorList component
   - Build ShareListModal component
@@ -208,7 +208,7 @@
   - Add invitations page
   - _Requirements: 5.1, 5.4, 8.1, 8.2_
 
-- [ ] 14. Implement profile management
+- [-] 14. Implement profile management
   - Create profile page and ProfileForm component
   - Implement updateProfile server action
   - Create PasswordChangeForm component

app/page.tsx

@@ -3,18 +3,39 @@ import ListCard from '@/components/ListCard'
 import NewListButton from '@/components/NewListButton'
 import GlobalSearch from '@/components/GlobalSearch'
 import EmptyState from '@/components/EmptyState'
+import Link from 'next/link'
+import { auth } from '@/auth'
 
 export const dynamic = 'force-dynamic'
 
 export default async function Home() {
   const lists = await getLists()
+  const session = await auth()
 
   return (
     <main className="container mx-auto px-4 sm:px-6 py-6 sm:py-8 max-w-7xl">
       <div className="flex flex-col sm:flex-row items-start sm:items-center justify-between gap-4 mb-6 sm:mb-8">
         <h1 className="text-2xl sm:text-3xl lg:text-4xl font-bold text-gray-900">Ultimate Lists</h1>
+        <div className="flex items-center gap-3">
+          {session?.user && (
+            <>
+              <Link
+                href="/invitations"
+                className="px-3 py-2 text-sm text-gray-700 hover:text-gray-900 hover:bg-gray-100 rounded-lg transition-colors"
+              >
+                Invitations
+              </Link>
+              <Link
+                href="/profile"
+                className="px-3 py-2 text-sm text-gray-700 hover:text-gray-900 hover:bg-gray-100 rounded-lg transition-colors"
+              >
+                Profile
+              </Link>
+            </>
+          )}
           <NewListButton />
         </div>
+      </div>
 
       {/* Global Search */}
       <div className="mb-6 sm:mb-8">

app/profile/page.tsx

@@ -0,0 +1,119 @@
+import { redirect } from 'next/navigation'
+import { auth } from '@/auth'
+import { getUserProfile } from '@/lib/auth-actions'
+import ProfileForm from '@/components/ProfileForm'
+import PasswordChangeForm from '@/components/PasswordChangeForm'
+import Link from 'next/link'
+
+export const metadata = {
+  title: 'Profile - Ultimate Lists',
+  description: 'Manage your profile and account settings',
+}
+
+export default async function ProfilePage() {
+  const session = await auth()
+
+  if (!session?.user?.id) {
+    redirect('/auth/login')
+  }
+
+  const userProfile = await getUserProfile(session.user.id)
+
+  if (!userProfile) {
+    redirect('/auth/login')
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 px-4 py-8">
+      <div className="max-w-3xl mx-auto">
+        {/* Header */}
+        <div className="mb-6">
+          <Link
+            href="/"
+            className="inline-flex items-center text-sm text-gray-600 hover:text-gray-900 mb-4"
+          >
+            <svg
+              className="w-4 h-4 mr-1"
+              fill="none"
+              stroke="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth={2}
+                d="M15 19l-7-7 7-7"
+              />
+            </svg>
+            Back to Lists
+          </Link>
+          <h1 className="text-3xl sm:text-4xl font-bold text-gray-900">
+            Profile Settings
+          </h1>
+          <p className="text-sm sm:text-base text-gray-600 mt-2">
+            Manage your account information and security settings
+          </p>
+        </div>
+
+        {/* Profile Information Section */}
+        <div className="bg-white rounded-xl shadow-md p-6 sm:p-8 mb-6">
+          <h2 className="text-xl sm:text-2xl font-semibold text-gray-900 mb-4">
+            Profile Information
+          </h2>
+          <p className="text-sm text-gray-600 mb-6">
+            Update your name and email address
+          </p>
+          <ProfileForm
+            initialName={userProfile.name}
+            initialEmail={userProfile.email}
+            userId={userProfile.id}
+          />
+        </div>
+
+        {/* Password Section */}
+        <div className="bg-white rounded-xl shadow-md p-6 sm:p-8 mb-6">
+          <h2 className="text-xl sm:text-2xl font-semibold text-gray-900 mb-4">
+            Change Password
+          </h2>
+          <p className="text-sm text-gray-600 mb-6">
+            Update your password to keep your account secure
+          </p>
+          <PasswordChangeForm userId={userProfile.id} />
+        </div>
+
+        {/* Account Information */}
+        <div className="bg-white rounded-xl shadow-md p-6 sm:p-8">
+          <h2 className="text-xl sm:text-2xl font-semibold text-gray-900 mb-4">
+            Account Information
+          </h2>
+          <div className="space-y-3 text-sm">
+            <div className="flex justify-between py-2 border-b border-gray-100">
+              <span className="text-gray-600">Account ID</span>
+              <span className="text-gray-900 font-mono text-xs">{userProfile.id}</span>
+            </div>
+            <div className="flex justify-between py-2 border-b border-gray-100">
+              <span className="text-gray-600">Member Since</span>
+              <span className="text-gray-900">
+                {new Date(userProfile.createdAt).toLocaleDateString('en-US', {
+                  year: 'numeric',
+                  month: 'long',
+                  day: 'numeric',
+                })}
+              </span>
+            </div>
+            <div className="flex justify-between py-2">
+              <span className="text-gray-600">Last Updated</span>
+              <span className="text-gray-900">
+                {new Date(userProfile.updatedAt).toLocaleDateString('en-US', {
+                  year: 'numeric',
+                  month: 'long',
+                  day: 'numeric',
+                })}
+              </span>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}

components/PasswordChangeForm.tsx

@@ -0,0 +1,245 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import { validatePassword } from '@/lib/validation'
+import { updatePassword } from '@/lib/auth-actions'
+import { useToast } from './ToastContainer'
+
+interface PasswordChangeFormProps {
+  userId: string
+}
+
+export default function PasswordChangeForm({ userId }: PasswordChangeFormProps) {
+  const { showToast } = useToast()
+  const [currentPassword, setCurrentPassword] = useState('')
+  const [newPassword, setNewPassword] = useState('')
+  const [confirmPassword, setConfirmPassword] = useState('')
+  const [isSubmitting, setIsSubmitting] = useState(false)
+  const [errors, setErrors] = useState<{
+    currentPassword?: string
+    newPassword?: string
+    confirmPassword?: string
+  }>({})
+  const [touched, setTouched] = useState<{
+    currentPassword: boolean
+    newPassword: boolean
+    confirmPassword: boolean
+  }>({
+    currentPassword: false,
+    newPassword: false,
+    confirmPassword: false,
+  })
+
+  // Inline validation when fields change
+  useEffect(() => {
+    if (touched.currentPassword) {
+      if (!currentPassword) {
+        setErrors((prev) => ({ ...prev, currentPassword: 'Current password is required' }))
+      } else {
+        setErrors((prev) => ({ ...prev, currentPassword: undefined }))
+      }
+    }
+  }, [currentPassword, touched.currentPassword])
+
+  useEffect(() => {
+    if (touched.newPassword) {
+      const result = validatePassword(newPassword)
+      setErrors((prev) => ({
+        ...prev,
+        newPassword: result.isValid ? undefined : result.error,
+      }))
+    }
+  }, [newPassword, touched.newPassword])
+
+  useEffect(() => {
+    if (touched.confirmPassword) {
+      if (!confirmPassword) {
+        setErrors((prev) => ({ ...prev, confirmPassword: 'Please confirm your new password' }))
+      } else if (newPassword !== confirmPassword) {
+        setErrors((prev) => ({ ...prev, confirmPassword: 'Passwords do not match' }))
+      } else {
+        setErrors((prev) => ({ ...prev, confirmPassword: undefined }))
+      }
+    }
+  }, [confirmPassword, newPassword, touched.confirmPassword])
+
+  const handleCurrentPasswordBlur = () => {
+    setTouched((prev) => ({ ...prev, currentPassword: true }))
+  }
+
+  const handleNewPasswordBlur = () => {
+    setTouched((prev) => ({ ...prev, newPassword: true }))
+  }
+
+  const handleConfirmPasswordBlur = () => {
+    setTouched((prev) => ({ ...prev, confirmPassword: true }))
+  }
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+
+    // Validate all fields before submission
+    const newPasswordResult = validatePassword(newPassword)
+
+    const newErrors: {
+      currentPassword?: string
+      newPassword?: string
+      confirmPassword?: string
+    } = {}
+
+    if (!currentPassword) {
+      newErrors.currentPassword = 'Current password is required'
+    }
+
+    if (!newPasswordResult.isValid) {
+      newErrors.newPassword = newPasswordResult.error
+    }
+
+    if (!confirmPassword) {
+      newErrors.confirmPassword = 'Please confirm your new password'
+    } else if (newPassword !== confirmPassword) {
+      newErrors.confirmPassword = 'Passwords do not match'
+    }
+
+    if (currentPassword === newPassword) {
+      newErrors.newPassword = 'New password must be different from current password'
+    }
+
+    if (Object.keys(newErrors).length > 0) {
+      setErrors(newErrors)
+      setTouched({ currentPassword: true, newPassword: true, confirmPassword: true })
+      return
+    }
+
+    setIsSubmitting(true)
+    setErrors({})
+
+    try {
+      const result = await updatePassword(userId, currentPassword, newPassword)
+
+      if (!result.success) {
+        if (result.error === 'Current password is incorrect') {
+          setErrors({ currentPassword: 'Current password is incorrect' })
+          showToast('Current password is incorrect', 'error')
+        } else {
+          showToast(result.error || 'Password update failed', 'error')
+        }
+      } else {
+        showToast('Password updated successfully', 'success')
+        // Reset form
+        setCurrentPassword('')
+        setNewPassword('')
+        setConfirmPassword('')
+        setTouched({ currentPassword: false, newPassword: false, confirmPassword: false })
+      }
+    } catch (err) {
+      console.error('Password update error:', err)
+      showToast('An error occurred. Please try again.', 'error')
+    } finally {
+      setIsSubmitting(false)
+    }
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4 sm:space-y-5">
+      <div>
+        <label htmlFor="currentPassword" className="block text-sm font-medium text-gray-700 mb-2">
+          Current Password *
+        </label>
+        <input
+          type="password"
+          id="currentPassword"
+          value={currentPassword}
+          onChange={(e) => setCurrentPassword(e.target.value)}
+          onBlur={handleCurrentPasswordBlur}
+          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
+            errors.currentPassword && touched.currentPassword
+              ? 'border-red-500 focus:ring-red-500'
+              : 'border-gray-300 focus:ring-blue-500'
+          }`}
+          placeholder="Enter your current password"
+          disabled={isSubmitting}
+          autoComplete="current-password"
+          aria-invalid={errors.currentPassword && touched.currentPassword ? 'true' : 'false'}
+          aria-describedby={errors.currentPassword && touched.currentPassword ? 'current-password-error' : undefined}
+        />
+        {errors.currentPassword && touched.currentPassword && (
+          <p id="current-password-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
+            {errors.currentPassword}
+          </p>
+        )}
+      </div>
+
+      <div>
+        <label htmlFor="newPassword" className="block text-sm font-medium text-gray-700 mb-2">
+          New Password *
+        </label>
+        <input
+          type="password"
+          id="newPassword"
+          value={newPassword}
+          onChange={(e) => setNewPassword(e.target.value)}
+          onBlur={handleNewPasswordBlur}
+          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
+            errors.newPassword && touched.newPassword
+              ? 'border-red-500 focus:ring-red-500'
+              : 'border-gray-300 focus:ring-blue-500'
+          }`}
+          placeholder="At least 8 characters"
+          disabled={isSubmitting}
+          autoComplete="new-password"
+          aria-invalid={errors.newPassword && touched.newPassword ? 'true' : 'false'}
+          aria-describedby={errors.newPassword && touched.newPassword ? 'new-password-error' : undefined}
+        />
+        {errors.newPassword && touched.newPassword && (
+          <p id="new-password-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
+            {errors.newPassword}
+          </p>
+        )}
+        {!errors.newPassword && touched.newPassword && (
+          <p className="mt-1.5 text-xs sm:text-sm text-gray-500">
+            Password must be at least 8 characters
+          </p>
+        )}
+      </div>
+
+      <div>
+        <label htmlFor="confirmPassword" className="block text-sm font-medium text-gray-700 mb-2">
+          Confirm New Password *
+        </label>
+        <input
+          type="password"
+          id="confirmPassword"
+          value={confirmPassword}
+          onChange={(e) => setConfirmPassword(e.target.value)}
+          onBlur={handleConfirmPasswordBlur}
+          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
+            errors.confirmPassword && touched.confirmPassword
+              ? 'border-red-500 focus:ring-red-500'
+              : 'border-gray-300 focus:ring-blue-500'
+          }`}
+          placeholder="Re-enter your new password"
+          disabled={isSubmitting}
+          autoComplete="new-password"
+          aria-invalid={errors.confirmPassword && touched.confirmPassword ? 'true' : 'false'}
+          aria-describedby={
+            errors.confirmPassword && touched.confirmPassword ? 'confirm-password-error' : undefined
+          }
+        />
+        {errors.confirmPassword && touched.confirmPassword && (
+          <p id="confirm-password-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
+            {errors.confirmPassword}
+          </p>
+        )}
+      </div>
+
+      <button
+        type="submit"
+        disabled={isSubmitting}
+        className="w-full px-4 sm:px-5 py-3 bg-blue-500 hover:bg-blue-600 active:bg-blue-700 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed tap-target font-medium text-sm sm:text-base"
+      >
+        {isSubmitting ? 'Updating...' : 'Update Password'}
+      </button>
+    </form>
+  )
+}

components/ProfileForm.tsx

@@ -0,0 +1,203 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import { validateEmail, sanitizeString } from '@/lib/validation'
+import { updateProfile } from '@/lib/auth-actions'
+import { useToast } from './ToastContainer'
+
+interface ProfileFormProps {
+  initialName: string | null
+  initialEmail: string
+  userId: string
+}
+
+export default function ProfileForm({ initialName, initialEmail, userId }: ProfileFormProps) {
+  const { showToast } = useToast()
+  const [name, setName] = useState(initialName || '')
+  const [email, setEmail] = useState(initialEmail)
+  const [isSubmitting, setIsSubmitting] = useState(false)
+  const [errors, setErrors] = useState<{
+    name?: string
+    email?: string
+  }>({})
+  const [touched, setTouched] = useState<{
+    name: boolean
+    email: boolean
+  }>({
+    name: false,
+    email: false,
+  })
+
+  // Check if form has changes
+  const hasChanges = name !== (initialName || '') || email !== initialEmail
+
+  // Inline validation when fields change
+  useEffect(() => {
+    if (touched.name) {
+      const sanitized = sanitizeString(name)
+      if (!sanitized) {
+        setErrors((prev) => ({ ...prev, name: 'Name is required' }))
+      } else if (sanitized.length > 100) {
+        setErrors((prev) => ({ ...prev, name: 'Name must be less than 100 characters' }))
+      } else {
+        setErrors((prev) => ({ ...prev, name: undefined }))
+      }
+    }
+  }, [name, touched.name])
+
+  useEffect(() => {
+    if (touched.email) {
+      const result = validateEmail(email)
+      setErrors((prev) => ({
+        ...prev,
+        email: result.isValid ? undefined : result.error,
+      }))
+    }
+  }, [email, touched.email])
+
+  const handleNameBlur = () => {
+    setTouched((prev) => ({ ...prev, name: true }))
+  }
+
+  const handleEmailBlur = () => {
+    setTouched((prev) => ({ ...prev, email: true }))
+  }
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+
+    // Validate all fields before submission
+    const sanitizedName = sanitizeString(name)
+    const emailResult = validateEmail(email)
+
+    const newErrors: {
+      name?: string
+      email?: string
+    } = {}
+
+    if (!sanitizedName) {
+      newErrors.name = 'Name is required'
+    } else if (sanitizedName.length > 100) {
+      newErrors.name = 'Name must be less than 100 characters'
+    }
+
+    if (!emailResult.isValid) {
+      newErrors.email = emailResult.error
+    }
+
+    if (Object.keys(newErrors).length > 0) {
+      setErrors(newErrors)
+      setTouched({ name: true, email: true })
+      return
+    }
+
+    if (!hasChanges) {
+      showToast('No changes to save', 'info')
+      return
+    }
+
+    setIsSubmitting(true)
+    setErrors({})
+
+    try {
+      const updateData: { name?: string; email?: string } = {}
+      
+      if (name !== (initialName || '')) {
+        updateData.name = sanitizedName
+      }
+      
+      if (email !== initialEmail) {
+        updateData.email = email.trim()
+      }
+
+      const result = await updateProfile(userId, updateData)
+
+      if (!result.success) {
+        if (result.error === 'Email already in use') {
+          setErrors({ email: 'This email is already in use' })
+          showToast('Email already in use', 'error')
+        } else {
+          showToast(result.error || 'Profile update failed', 'error')
+        }
+      } else {
+        showToast('Profile updated successfully', 'success')
+        // Refresh the page to update the session
+        window.location.reload()
+      }
+    } catch (err) {
+      console.error('Profile update error:', err)
+      showToast('An error occurred. Please try again.', 'error')
+    } finally {
+      setIsSubmitting(false)
+    }
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4 sm:space-y-5">
+      <div>
+        <label htmlFor="name" className="block text-sm font-medium text-gray-700 mb-2">
+          Name *
+        </label>
+        <input
+          type="text"
+          id="name"
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          onBlur={handleNameBlur}
+          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
+            errors.name && touched.name
+              ? 'border-red-500 focus:ring-red-500'
+              : 'border-gray-300 focus:ring-blue-500'
+          }`}
+          placeholder="Enter your name"
+          disabled={isSubmitting}
+          autoComplete="name"
+          maxLength={100}
+          aria-invalid={errors.name && touched.name ? 'true' : 'false'}
+          aria-describedby={errors.name && touched.name ? 'name-error' : undefined}
+        />
+        {errors.name && touched.name && (
+          <p id="name-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
+            {errors.name}
+          </p>
+        )}
+      </div>
+
+      <div>
+        <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-2">
+          Email *
+        </label>
+        <input
+          type="email"
+          id="email"
+          value={email}
+          onChange={(e) => setEmail(e.target.value)}
+          onBlur={handleEmailBlur}
+          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
+            errors.email && touched.email
+              ? 'border-red-500 focus:ring-red-500'
+              : 'border-gray-300 focus:ring-blue-500'
+          }`}
+          placeholder="Enter your email"
+          disabled={isSubmitting}
+          autoComplete="email"
+          aria-invalid={errors.email && touched.email ? 'true' : 'false'}
+          aria-describedby={errors.email && touched.email ? 'email-error' : undefined}
+        />
+        {errors.email && touched.email && (
+          <p id="email-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
+            {errors.email}
+          </p>
+        )}
+      </div>
+
+      <button
+        type="submit"
+        disabled={isSubmitting || !hasChanges}
+        className="w-full px-4 sm:px-5 py-3 bg-blue-500 hover:bg-blue-600 active:bg-blue-700 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed tap-target font-medium text-sm sm:text-base"
+      >
+        {isSubmitting ? 'Saving...' : 'Save Changes'}
+      </button>
+    </form>
+  )
+}

lib/auth-actions.ts

@@ -173,3 +173,157 @@ export async function isAuthenticated(): Promise<boolean> {
   const session = await getCurrentSession()
   return !!session?.user
 }
+
+// Profile management schemas
+const updateProfileSchema = z.object({
+  name: z.string().min(1, { message: 'Name is required' }).max(100, { message: 'Name must be less than 100 characters' }).optional(),
+  email: z.string().email({ message: 'Invalid email address' }).optional(),
+})
+
+const updatePasswordSchema = z.object({
+  currentPassword: z.string().min(1, { message: 'Current password is required' }),
+  newPassword: z.string().min(8, { message: 'New password must be at least 8 characters' }),
+})
+
+export type UpdateProfileResult = 
+  | { success: true }
+  | { success: false; error: string }
+
+export type UpdatePasswordResult = 
+  | { success: true }
+  | { success: false; error: string }
+
+/**
+ * Update user profile information
+ * Requirements: 7.1, 7.4, 7.5
+ */
+export async function updateProfile(
+  userId: string,
+  data: { name?: string; email?: string }
+): Promise<UpdateProfileResult> {
+  try {
+    // Validate input
+    const validation = updateProfileSchema.safeParse(data)
+    
+    if (!validation.success) {
+      const errors = validation.error.issues.map((issue) => issue.message).join(', ')
+      return { success: false, error: errors }
+    }
+
+    const { name, email } = validation.data
+
+    // Check if there's anything to update
+    if (!name && !email) {
+      return { success: false, error: 'No data to update' }
+    }
+
+    // If email is being updated, check uniqueness (Requirement 7.4)
+    if (email) {
+      const existingUser = await prisma.user.findUnique({
+        where: { email },
+      })
+
+      // Check if email is already in use by another user
+      if (existingUser && existingUser.id !== userId) {
+        return { success: false, error: 'Email already in use' }
+      }
+    }
+
+    // Update user profile (Requirement 7.1)
+    await prisma.user.update({
+      where: { id: userId },
+      data: {
+        ...(name !== undefined && { name }),
+        ...(email !== undefined && { email }),
+      },
+    })
+
+    return { success: true }
+  } catch (error) {
+    console.error('Profile update error:', error)
+    
+    // Handle unique constraint violation
+    if (error instanceof Error && error.message.includes('Unique constraint')) {
+      return { success: false, error: 'Email already in use' }
+    }
+    
+    return { success: false, error: 'Profile update failed. Please try again.' }
+  }
+}
+
+/**
+ * Update user password
+ * Requirements: 7.2, 7.3
+ */
+export async function updatePassword(
+  userId: string,
+  currentPassword: string,
+  newPassword: string
+): Promise<UpdatePasswordResult> {
+  try {
+    // Validate input
+    const validation = updatePasswordSchema.safeParse({ currentPassword, newPassword })
+    
+    if (!validation.success) {
+      const errors = validation.error.issues.map((issue) => issue.message).join(', ')
+      return { success: false, error: errors }
+    }
+
+    // Get user from database
+    const user = await prisma.user.findUnique({
+      where: { id: userId },
+    })
+
+    if (!user || !user.passwordHash) {
+      return { success: false, error: 'User not found' }
+    }
+
+    // Verify current password (Requirement 7.2)
+    const isCurrentPasswordValid = await bcrypt.compare(currentPassword, user.passwordHash)
+
+    if (!isCurrentPasswordValid) {
+      return { success: false, error: 'Current password is incorrect' }
+    }
+
+    // Hash new password (Requirement 7.3)
+    const newPasswordHash = await bcrypt.hash(newPassword, 10)
+
+    // Update password
+    await prisma.user.update({
+      where: { id: userId },
+      data: {
+        passwordHash: newPasswordHash,
+      },
+    })
+
+    return { success: true }
+  } catch (error) {
+    console.error('Password update error:', error)
+    return { success: false, error: 'Password update failed. Please try again.' }
+  }
+}
+
+/**
+ * Get user profile (without sensitive data)
+ * Requirement: 7.5 - Profile data exposure protection
+ */
+export async function getUserProfile(userId: string) {
+  try {
+    const user = await prisma.user.findUnique({
+      where: { id: userId },
+      select: {
+        id: true,
+        email: true,
+        name: true,
+        createdAt: true,
+        updatedAt: true,
+        // Explicitly exclude passwordHash (Requirement 7.5)
+      },
+    })
+
+    return user
+  } catch (error) {
+    console.error('Get user profile error:', error)
+    return null
+  }
+}