refactor: 抽取 UI 组件、改进错误页面、统一导入路径并简化数据库接口

src/components/Error.tsx

@@ -1,3 +1,40 @@
-export function ErrorComponent() {
-  return <div>An unhandled error happened!</div>
+export const ErrorComponent = ({ error, reset }: { error: Error; reset: () => void }) => {
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-slate-50 px-4">
+      <div className="max-w-md w-full text-center space-y-6">
+        <div className="inline-flex items-center justify-center w-16 h-16 rounded-full bg-red-100">
+          <svg
+            className="w-8 h-8 text-red-500"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+            strokeWidth={1.5}
+            aria-hidden="true"
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              d="M12 9v3.75m9-.75a9 9 0 11-18 0 9 9 0 0118 0zm-9 3.75h.008v.008H12v-.008z"
+            />
+          </svg>
+        </div>
+        <div>
+          <h1 className="text-2xl font-bold text-slate-900">出错了</h1>
+          <p className="text-slate-500 mt-2">{error.message}</p>
+        </div>
+        <div className="flex items-center justify-center gap-4">
+          <button
+            type="button"
+            onClick={reset}
+            className="px-6 py-2.5 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl font-medium transition-colors"
+          >
+            重试
+          </button>
+          <a href="/" className="px-6 py-2.5 text-slate-600 hover:text-slate-900 font-medium transition-colors">
+            返回首页
+          </a>
+        </div>
+      </div>
+    </div>
+  )
 }

src/components/NotFound.tsx

@@ -1,3 +1,23 @@
-export function NotFoundComponent() {
-  return <div>404 - Not Found</div>
+import { Link } from '@tanstack/react-router'
+
+export const NotFoundComponent = () => {
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-slate-50 px-4">
+      <div className="max-w-md w-full text-center space-y-6">
+        <div className="inline-flex items-center justify-center w-16 h-16 rounded-full bg-slate-100">
+          <span className="text-3xl font-bold text-slate-400">404</span>
+        </div>
+        <div>
+          <h1 className="text-2xl font-bold text-slate-900">页面不存在</h1>
+          <p className="text-slate-500 mt-2">您访问的页面可能已被移除或地址有误</p>
+        </div>
+        <Link
+          to="/"
+          className="inline-block px-6 py-2.5 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl font-medium transition-colors"
+        >
+          返回首页
+        </Link>
+      </div>
+    </div>
+  )
 }

src/components/TodoForm.tsx

@@ -0,0 +1,41 @@
+import type { SubmitEventHandler } from 'react'
+import { useState } from 'react'
+
+interface TodoFormProps {
+  onSubmit: (title: string) => void
+  isPending: boolean
+}
+
+export const TodoForm = ({ onSubmit, isPending }: TodoFormProps) => {
+  const [title, setTitle] = useState('')
+
+  const handleSubmit: SubmitEventHandler<HTMLFormElement> = (e) => {
+    e.preventDefault()
+    if (title.trim()) {
+      onSubmit(title.trim())
+      setTitle('')
+    }
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="relative group z-10">
+      <div className="relative transform transition-all duration-200 focus-within:-translate-y-1">
+        <input
+          type="text"
+          value={title}
+          onChange={(e) => setTitle(e.target.value)}
+          placeholder="添加新任务..."
+          className="w-full pl-6 pr-32 py-5 bg-white rounded-2xl shadow-[0_8px_30px_rgb(0,0,0,0.04)] border-0 ring-1 ring-slate-100 focus:ring-2 focus:ring-indigo-500/50 outline-none transition-all placeholder:text-slate-400 text-lg text-slate-700"
+          disabled={isPending}
+        />
+        <button
+          type="submit"
+          disabled={isPending || !title.trim()}
+          className="absolute right-3 top-3 bottom-3 px-6 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl font-medium transition-all shadow-md shadow-indigo-200 disabled:opacity-50 disabled:shadow-none hover:shadow-lg hover:shadow-indigo-300 active:scale-95"
+        >
+          {isPending ? '添加中' : '添加'}
+        </button>
+      </div>
+    </form>
+  )
+}

src/components/TodoItem.tsx

@@ -0,0 +1,77 @@
+import type { RouterOutputs } from '@/server/api/types'
+
+type Todo = RouterOutputs['todo']['list'][number]
+
+interface TodoItemProps {
+  todo: Todo
+  onToggle: (id: string, completed: boolean) => void
+  onDelete: (id: string) => void
+}
+
+export const TodoItem = ({ todo, onToggle, onDelete }: TodoItemProps) => {
+  return (
+    <div
+      className={`group relative flex items-center p-4 bg-white rounded-xl border border-slate-100 shadow-sm transition-all duration-200 hover:shadow-md hover:border-slate-200 ${
+        todo.completed ? 'bg-slate-50/50' : ''
+      }`}
+    >
+      <button
+        type="button"
+        onClick={() => onToggle(todo.id, todo.completed)}
+        className={`shrink-0 w-6 h-6 rounded-full border-2 transition-all duration-200 flex items-center justify-center mr-4 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 ${
+          todo.completed ? 'bg-indigo-500 border-indigo-500' : 'border-slate-300 hover:border-indigo-500 bg-white'
+        }`}
+      >
+        {todo.completed && (
+          <svg
+            className="w-3.5 h-3.5 text-white"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+            strokeWidth={3}
+            aria-hidden="true"
+          >
+            <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
+          </svg>
+        )}
+      </button>
+
+      <div className="flex-1 min-w-0">
+        <p
+          className={`text-lg transition-all duration-200 truncate ${
+            todo.completed ? 'text-slate-400 line-through decoration-slate-300 decoration-2' : 'text-slate-700'
+          }`}
+        >
+          {todo.title}
+        </p>
+      </div>
+
+      <div className="flex items-center opacity-0 group-hover:opacity-100 transition-opacity duration-200 absolute right-4 pl-4 bg-linear-to-l from-white via-white to-transparent sm:static sm:bg-none">
+        <span className="text-xs text-slate-400 mr-3 hidden sm:inline-block">
+          {new Date(todo.createdAt).toLocaleDateString('zh-CN')}
+        </span>
+        <button
+          type="button"
+          onClick={() => onDelete(todo.id)}
+          className="p-2 text-slate-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors focus:outline-none"
+          title="删除"
+        >
+          <svg
+            className="w-5 h-5"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+            strokeWidth={1.5}
+            aria-hidden="true"
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
+            />
+          </svg>
+        </button>
+      </div>
+    </div>
+  )
+}

src/routes/__root.tsx

@@ -34,8 +34,8 @@ export const Route = createRootRouteWithContext<RouterContext>()({
     ],
   }),
   shellComponent: RootDocument,
-  errorComponent: () => <ErrorComponent />,
-  notFoundComponent: () => <NotFoundComponent />,
+  errorComponent: ErrorComponent,
+  notFoundComponent: NotFoundComponent,
 })
 
 function RootDocument({ children }: Readonly<{ children: ReactNode }>) {

src/routes/index.tsx

@@ -1,8 +1,8 @@
 import { useMutation, useSuspenseQuery } from '@tanstack/react-query'
 import { createFileRoute } from '@tanstack/react-router'
-import type { ChangeEventHandler, SubmitEventHandler } from 'react'
-import { useState } from 'react'
 import { orpc } from '@/client/orpc'
+import { TodoForm } from '@/components/TodoForm'
+import { TodoItem } from '@/components/TodoItem'
 
 export const Route = createFileRoute('/')({
   component: Todos,
@@ -12,36 +12,11 @@ export const Route = createFileRoute('/')({
 })
 
 function Todos() {
-  const [newTodoTitle, setNewTodoTitle] = useState('')
-
   const listQuery = useSuspenseQuery(orpc.todo.list.queryOptions())
   const createMutation = useMutation(orpc.todo.create.mutationOptions())
   const updateMutation = useMutation(orpc.todo.update.mutationOptions())
   const deleteMutation = useMutation(orpc.todo.remove.mutationOptions())
 
-  const handleCreateTodo: SubmitEventHandler<HTMLFormElement> = (e) => {
-    e.preventDefault()
-    if (newTodoTitle.trim()) {
-      createMutation.mutate({ title: newTodoTitle.trim() })
-      setNewTodoTitle('')
-    }
-  }
-
-  const handleInputChange: ChangeEventHandler<HTMLInputElement> = (e) => {
-    setNewTodoTitle(e.target.value)
-  }
-
-  const handleToggleTodo = (id: string, currentCompleted: boolean) => {
-    updateMutation.mutate({
-      id,
-      data: { completed: !currentCompleted },
-    })
-  }
-
-  const handleDeleteTodo = (id: string) => {
-    deleteMutation.mutate({ id })
-  }
-
   const todos = listQuery.data
   const completedCount = todos.filter((todo) => todo.completed).length
   const totalCount = todos.length
@@ -65,28 +40,9 @@ function Todos() {
           </div>
         </div>
 
-        {/* Add Todo Form */}
-        <form onSubmit={handleCreateTodo} className="relative group z-10">
-          <div className="relative transform transition-all duration-200 focus-within:-translate-y-1">
-            <input
-              type="text"
-              value={newTodoTitle}
-              onChange={handleInputChange}
-              placeholder="添加新任务..."
-              className="w-full pl-6 pr-32 py-5 bg-white rounded-2xl shadow-[0_8px_30px_rgb(0,0,0,0.04)] border-0 ring-1 ring-slate-100 focus:ring-2 focus:ring-indigo-500/50 outline-none transition-all placeholder:text-slate-400 text-lg text-slate-700"
-              disabled={createMutation.isPending}
-            />
-            <button
-              type="submit"
-              disabled={createMutation.isPending || !newTodoTitle.trim()}
-              className="absolute right-3 top-3 bottom-3 px-6 bg-indigo-600 hover:bg-indigo-700 text-white rounded-xl font-medium transition-all shadow-md shadow-indigo-200 disabled:opacity-50 disabled:shadow-none hover:shadow-lg hover:shadow-indigo-300 active:scale-95"
-            >
-              {createMutation.isPending ? '添加中' : '添加'}
-            </button>
-          </div>
-        </form>
+        <TodoForm onSubmit={(title) => createMutation.mutate({ title })} isPending={createMutation.isPending} />
 
-        {/* Progress Bar (Only visible when there are tasks) */}
+        {/* Progress Bar */}
         {totalCount > 0 && (
           <div className="h-1.5 w-full bg-slate-200 rounded-full overflow-hidden">
             <div
@@ -116,74 +72,12 @@ function Todos() {
             </div>
           ) : (
             todos.map((todo) => (
-              <div
+              <TodoItem
                 key={todo.id}
-                className={`group relative flex items-center p-4 bg-white rounded-xl border border-slate-100 shadow-sm transition-all duration-200 hover:shadow-md hover:border-slate-200 ${
-                  todo.completed ? 'bg-slate-50/50' : ''
-                }`}
-              >
-                <button
-                  type="button"
-                  onClick={() => handleToggleTodo(todo.id, todo.completed)}
-                  className={`flex-shrink-0 w-6 h-6 rounded-full border-2 transition-all duration-200 flex items-center justify-center mr-4 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 ${
-                    todo.completed
-                      ? 'bg-indigo-500 border-indigo-500'
-                      : 'border-slate-300 hover:border-indigo-500 bg-white'
-                  }`}
-                >
-                  {todo.completed && (
-                    <svg
-                      className="w-3.5 h-3.5 text-white"
-                      fill="none"
-                      viewBox="0 0 24 24"
-                      stroke="currentColor"
-                      strokeWidth={3}
-                      aria-hidden="true"
-                    >
-                      <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
-                    </svg>
-                  )}
-                </button>
-
-                <div className="flex-1 min-w-0">
-                  <p
-                    className={`text-lg transition-all duration-200 truncate ${
-                      todo.completed
-                        ? 'text-slate-400 line-through decoration-slate-300 decoration-2'
-                        : 'text-slate-700'
-                    }`}
-                  >
-                    {todo.title}
-                  </p>
-                </div>
-
-                <div className="flex items-center opacity-0 group-hover:opacity-100 transition-opacity duration-200 absolute right-4 pl-4 bg-gradient-to-l from-white via-white to-transparent sm:static sm:bg-none">
-                  <span className="text-xs text-slate-400 mr-3 hidden sm:inline-block">
-                    {new Date(todo.createdAt).toLocaleDateString('zh-CN')}
-                  </span>
-                  <button
-                    type="button"
-                    onClick={() => handleDeleteTodo(todo.id)}
-                    className="p-2 text-slate-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors focus:outline-none"
-                    title="删除"
-                  >
-                    <svg
-                      className="w-5 h-5"
-                      fill="none"
-                      viewBox="0 0 24 24"
-                      stroke="currentColor"
-                      strokeWidth={1.5}
-                      aria-hidden="true"
-                    >
-                      <path
-                        strokeLinecap="round"
-                        strokeLinejoin="round"
-                        d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
-                      />
-                    </svg>
-                  </button>
-                </div>
-              </div>
+                todo={todo}
+                onToggle={(id, completed) => updateMutation.mutate({ id, data: { completed: !completed } })}
+                onDelete={(id) => deleteMutation.mutate({ id })}
+              />
             ))
           )}
         </div>

src/server/api/routers/index.ts

@@ -1,4 +1,4 @@
-import { os } from '../server'
+import { os } from '@/server/api/server'
 import * as todo from './todo.router'
 
 export const router = os.router({

src/server/api/routers/todo.router.ts

@@ -1,8 +1,8 @@
 import { ORPCError } from '@orpc/server'
 import { eq } from 'drizzle-orm'
+import { db } from '@/server/api/middlewares'
+import { os } from '@/server/api/server'
 import { todoTable } from '@/server/db/schema'
-import { db } from '../middlewares'
-import { os } from '../server'
 
 export const list = os.todo.list.use(db).handler(async ({ context }) => {
   const todos = await context.db.query.todoTable.findMany({

src/server/db/index.ts

@@ -13,11 +13,7 @@ export type DB = ReturnType<typeof createDB>
 export const getDB = (() => {
   let db: DB | null = null
 
-  return (singleton = true): DB => {
-    if (!singleton) {
-      return createDB()
-    }
-
+  return (): DB => {
     db ??= createDB()
     return db
   }