"use client";

import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { api } from "@/lib/api";
import { zodResolver } from "@hookform/resolvers/zod";
import axios from "axios";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { useState } from "react";
import { useForm } from "react-hook-form";
import z, { email } from "zod";

const SignupSchema = z
  .object({
    name: z.string().min(1, "아이디를 입력하세요."),
    password: z.string().min(4, "비밀번호는 4자 이상이어야 합니다."),
    confirmPassword: z.string().min(1, "비밀번호 확인을 입력하세요."),
    email: z.email("이메일 형식이 아닙니다.").optional(),
  })
  .refine((v) => v.password === v.confirmPassword, {
    path: ["confirmPassword"],
    message: "비밀번호가 일치하지 않습니다.",
  });

type SignupInput = z.infer<typeof SignupSchema>;

export default function SignupPage() {
  const form = useForm<SignupInput>({
    resolver: zodResolver(SignupSchema),
    defaultValues: {
      name: "",
      password: "",
      confirmPassword: "",
      email: undefined,
    },
    mode: "onTouched",
  });

  const [error, setError] = useState<string | null>(null);
  const [ok, setOk] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  const onSubmit = async (values: SignupInput) => {
    setError(null);
    setOk(null);
    setLoading(true);
    try {
      const payload: Record<string, unknown> = {
        name: values.name.trim(),
        password: values.password,
      };
      const emailTrim = values.email?.trim();
      if (emailTrim) payload.email = emailTrim;

      await api.post("/auth/signup", payload);
      setOk("회원가입이 완료되어습니다. 로그인 페이지로 이동합니다.");
      setTimeout(() => router.replace("/login"), 800);
    } catch (e: unknown) {
      if (axios.isAxiosError(e)) {
        setError(
          e.request?.data?.message ?? e.message ?? "회원가입에 실패했습니다."
        );
      } else if (e instanceof Error) {
        setError(e.message);
      } else {
        setError("회원가입에 실패했습니다.");
      }
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="flex items-center justify-center min-h-screen">
      <div className="mx-auto w-full max-w-sm">
        <Card className="shadow-lg">
          <CardHeader>
            <CardTitle>회원가입</CardTitle>
          </CardHeader>
          <CardContent className="flex flex-col gap-y-2 pb-4">
            <Form {...form}>
              <form
                className="space-y-4"
                onSubmit={form.handleSubmit(onSubmit)}
              >
                {/* name */}
                <FormField
                  control={form.control}
                  name="name"
                  render={({ field }) => (
                    <FormItem>
                      <FormControl>
                        <Input
                          placeholder="아이디"
                          autoComplete="username"
                          {...field}
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                {/* email */}
                <FormField
                  control={form.control}
                  name="email"
                  render={({ field }) => (
                    <FormItem>
                      <FormControl>
                        <Input
                          placeholder="이메일(선택)"
                          type="email"
                          autoComplete="email"
                          {...field}
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                {/* password */}
                <FormField
                  control={form.control}
                  name="password"
                  render={({ field }) => (
                    <FormItem>
                      <FormControl>
                        <Input
                          placeholder="비밀번호"
                          type="password"
                          autoComplete="new-password"
                          {...field}
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                {/* confirmPassword */}
                <FormField
                  control={form.control}
                  name="confirmPassword"
                  render={({ field }) => (
                    <FormItem>
                      <FormControl>
                        <Input
                          placeholder="비밀번호 확인"
                          type="password"
                          autoComplete="new-password"
                          {...field}
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <Button type="submit" className="w-full" disabled={loading}>
                  {loading ? "처리 중..." : "가입하기"}
                </Button>

                {error && (
                  <p className="text-center text-sm text-red-600">{error}</p>
                )}
                {ok && (
                  <p className="text-center text-sm text-green-600">{ok}</p>
                )}

                <p className="text-center text-xs text-gray-500">
                  이미 계정이 있으신가요?{" "}
                  <Link href="/login" className="underline">
                    로그인
                  </Link>
                </p>
              </form>
            </Form>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}