feat: 首次登录引导与注册修复

src/app/(auth)/register/page.tsx

@@ -2,8 +2,6 @@ import { Metadata } from "next"
 import { createId } from "@paralleldrive/cuid2"
 import { eq } from "drizzle-orm"
 
-import { db } from "@/shared/db"
-import { users } from "@/shared/db/schema"
 import type { ActionState } from "@/shared/types/action-state"
 import { RegisterForm } from "@/modules/auth/components/register-form"
 
@@ -16,29 +14,100 @@ export default function RegisterPage() {
   async function registerAction(formData: FormData): Promise<ActionState> {
     "use server"
 
-    const name = String(formData.get("name") ?? "").trim()
-    const email = String(formData.get("email") ?? "").trim().toLowerCase()
-    const password = String(formData.get("password") ?? "")
+    const databaseUrl = process.env.DATABASE_URL
+    if (!databaseUrl) return { success: false, message: "DATABASE_URL 未配置" }
 
-    if (!email) return { success: false, message: "Email is required" }
-    if (!password) return { success: false, message: "Password is required" }
-    if (password.length < 6) return { success: false, message: "Password must be at least 6 characters" }
+    try {
+      const [{ db }, { users }] = await Promise.all([
+        import("@/shared/db"),
+        import("@/shared/db/schema"),
+      ])
 
-    const existing = await db.query.users.findFirst({
-      where: eq(users.email, email),
-      columns: { id: true },
-    })
-    if (existing) return { success: false, message: "Email already registered" }
+      const name = String(formData.get("name") ?? "").trim()
+      const email = String(formData.get("email") ?? "").trim().toLowerCase()
+      const password = String(formData.get("password") ?? "")
 
-    await db.insert(users).values({
-      id: createId(),
-      name: name.length ? name : null,
-      email,
-      password,
-      role: "student",
-    })
+      if (!email) return { success: false, message: "请输入邮箱" }
+      if (!password) return { success: false, message: "请输入密码" }
+      if (password.length < 6) return { success: false, message: "密码至少 6 位" }
 
-    return { success: true, message: "Account created" }
+      const existing = await db.query.users.findFirst({
+        where: eq(users.email, email),
+        columns: { id: true },
+      })
+      if (existing) return { success: false, message: "该邮箱已注册" }
+
+      await db.insert(users).values({
+        id: createId(),
+        name: name.length ? name : null,
+        email,
+        password,
+        role: "student",
+      })
+
+      return { success: true, message: "账户创建成功" }
+    } catch (error) {
+      const isProd = process.env.NODE_ENV === "production"
+
+      const anyErr = error as unknown as {
+        code?: string
+        message?: string
+        sqlMessage?: string
+        cause?: unknown
+      }
+
+      const cause1 = anyErr?.cause as
+        | { code?: string; message?: string; sqlMessage?: string; cause?: unknown }
+        | undefined
+      const cause2 = (cause1?.cause ?? undefined) as
+        | { code?: string; message?: string; sqlMessage?: string }
+        | undefined
+
+      const code = String(cause2?.code ?? cause1?.code ?? anyErr?.code ?? "").trim()
+      const msg = String(
+        cause2?.sqlMessage ??
+          cause1?.sqlMessage ??
+          anyErr?.sqlMessage ??
+          cause2?.message ??
+          cause1?.message ??
+          anyErr?.message ??
+          ""
+      ).trim()
+      const msgLower = msg.toLowerCase()
+
+      if (
+        code === "ER_DUP_ENTRY" ||
+        msgLower.includes("duplicate") ||
+        msgLower.includes("unique")
+      ) {
+        return { success: false, message: "该邮箱已注册" }
+      }
+
+      if (
+        code === "ER_NO_SUCH_TABLE" ||
+        msgLower.includes("doesn't exist") ||
+        msgLower.includes("unknown column")
+      ) {
+        return {
+          success: false,
+          message: "数据库未初始化或未迁移，请先运行 npm run db:migrate",
+        }
+      }
+
+      if (code === "ER_ACCESS_DENIED_ERROR") {
+        return { success: false, message: "数据库账号/权限错误，请检查 DATABASE_URL" }
+      }
+
+      if (code === "ECONNREFUSED" || code === "ENOTFOUND") {
+        return { success: false, message: "数据库连接失败，请检查 DATABASE_URL 与网络" }
+      }
+
+      if (!isProd && msg) {
+        return { success: false, message: `创建账户失败：${msg}` }
+      }
+
+      return { success: false, message: "创建账户失败，请稍后重试" }
+    }
   }
 
   return <RegisterForm registerAction={registerAction} />