"use server"

import { z } from "zod"
import { eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { users } from "@/lib/db/schema"
import { hashPassword } from "@/lib/auth/password"

const registerSchema = z
  .object({
    name: z.string().min(1, "请输入姓名/昵称").max(100),
    email: z.string().email("请输入有效的邮箱地址").max(255),
    password: z.string().min(8, "密码长度至少需要 8 个字符"),
    confirmPassword: z.string().min(1, "请确认密码"),
  })
  .refine(
    (data: { password: string; confirmPassword: string }) =>
      data.password === data.confirmPassword,
    {
      message: "两次输入的密码不一致",
      path: ["confirmPassword"],
    }
  )

export type RegisterState = {
  success?: boolean
  error?: string
  fieldErrors?: Record<string, string[]>
}

export async function registerAction(
  prevState: RegisterState | null,
  formData: FormData
): Promise<RegisterState> {
  const rawData = {
    name: formData.get("name"),
    email: formData.get("email"),
    password: formData.get("password"),
    confirmPassword: formData.get("confirmPassword"),
  }

  const parsed = registerSchema.safeParse(rawData)
  if (!parsed.success) {
    return {
      success: false,
      fieldErrors: parsed.error.flatten().fieldErrors,
    }
  }

  const { name, email, password } = parsed.data
  const normalizedEmail = email.toLowerCase().trim()

  try {
    // 检查邮箱是否已被注册
    const [existing] = await db
      .select()
      .from(users)
      .where(eq(users.email, normalizedEmail))
      .limit(1)

    if (existing) {
      return {
        success: false,
        error: "该邮箱已被注册，请直接登录",
      }
    }

    // 使用 Argon2 哈希密码
    const passwordHash = await hashPassword(password)

    // 插入新用户
    await db.insert(users).values({
      name: name.trim(),
      email: normalizedEmail,
      passwordHash,
      isActive: true,
    })

    return {
      success: true,
    }
  } catch (err) {
    console.error("Registration error:", err)
    return {
      success: false,
      error: "注册失败，请稍后重试",
    }
  }
}