"use client";

import { useState, useEffect, Suspense } from "react";
import { useSearchParams, useRouter } from "next/navigation";
import Link from "next/link";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { api } from "@/lib/api";

function ResetPasswordForm() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const token = searchParams.get("token");

  const [newPassword, setNewPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);
  const [success, setSuccess] = useState(false);
  const [countdown, setCountdown] = useState(3);

  useEffect(() => {
    if (success && countdown > 0) {
      const timer = setTimeout(() => setCountdown((c) => c - 1), 1000);
      return () => clearTimeout(timer);
    }
    if (success && countdown === 0) {
      router.push("/login");
    }
  }, [success, countdown, router]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError("");

    if (newPassword !== confirmPassword) {
      setError("两次输入的密码不一致");
      return;
    }

    if (!token) {
      setError("重置令牌无效或已过期");
      return;
    }

    setLoading(true);
    try {
      await api.auth.resetPassword(token, newPassword);
      setSuccess(true);
    } catch (err: unknown) {
      const message = err instanceof Error ? err.message : "重置失败";
      setError(message);
    } finally {
      setLoading(false);
    }
  };

  if (success) {
    return (
      <Card className="w-full max-w-md">
        <CardHeader className="space-y-1">
          <CardTitle className="text-2xl">密码重置成功</CardTitle>
          <CardDescription>
            您的密码已重置，{countdown} 秒后自动跳转到登录页
          </CardDescription>
        </CardHeader>
        <CardFooter>
          <Link href="/login" className="text-sm text-primary hover:underline">
            立即登录
          </Link>
        </CardFooter>
      </Card>
    );
  }

  return (
    <Card className="w-full max-w-md">
      <CardHeader className="space-y-1">
        <CardTitle className="text-2xl">重置密码</CardTitle>
        <CardDescription>请输入您的新密码</CardDescription>
      </CardHeader>
      <form onSubmit={handleSubmit}>
        <CardContent className="space-y-4">
          {error && (
            <p className="text-sm text-destructive">{error}</p>
          )}
          <div className="space-y-2">
            <Label htmlFor="newPassword">新密码</Label>
            <Input
              id="newPassword"
              type="password"
              placeholder="请输入新密码"
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              required
            />
          </div>
          <div className="space-y-2">
            <Label htmlFor="confirmPassword">确认密码</Label>
            <Input
              id="confirmPassword"
              type="password"
              placeholder="请再次输入新密码"
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              required
            />
          </div>
        </CardContent>
        <CardFooter className="flex flex-col space-y-4">
          <Button type="submit" className="w-full" disabled={loading}>
            {loading ? "提交中..." : "重置密码"}
          </Button>
          <Link href="/login" className="text-sm text-primary hover:underline">
            返回登录
          </Link>
        </CardFooter>
      </form>
    </Card>
  );
}

export default function ResetPasswordPage() {
  return (
    <Suspense
      fallback={
        <Card className="w-full max-w-md">
          <CardHeader className="space-y-1">
            <CardTitle className="text-2xl">重置密码</CardTitle>
            <CardDescription>加载中...</CardDescription>
          </CardHeader>
        </Card>
      }
    >
      <ResetPasswordForm />
    </Suspense>
  );
}