"use client";
import { useState } from "react";
import { useRouter } from "next/navigation";

export default function RegisterPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [discordId, setDiscordId] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError("");
    try {
      const r = await fetch("/api/auth/register", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password, discord_id: discordId || undefined }),
      });
      const data = await r.json();
      if (!r.ok) { setError(data.detail || "注册失败"); return; }
      router.push("/login?registered=1");
    } catch {
      setError("网络错误，请重试");
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-[70vh] flex items-center justify-center">
      <div className="w-full max-w-md rounded-xl border border-slate-200 bg-white p-8 space-y-6">
        <div>
          <h1 className="text-2xl font-bold text-slate-900">注册账号</h1>
          <p className="text-slate-500 text-sm mt-1">注册后可接收套利信号推送</p>
        </div>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label className="block text-sm text-slate-700 mb-1">邮箱</label>
            <input
              type="email" required value={email} onChange={e => setEmail(e.target.value)}
              className="w-full bg-white border border-slate-200 rounded-lg px-3 py-2 text-slate-900 text-sm focus:outline-none focus:border-cyan-500"
              placeholder="your@email.com"
            />
          </div>
          <div>
            <label className="block text-sm text-slate-700 mb-1">密码</label>
            <input
              type="password" required value={password} onChange={e => setPassword(e.target.value)}
              className="w-full bg-white border border-slate-200 rounded-lg px-3 py-2 text-slate-900 text-sm focus:outline-none focus:border-cyan-500"
              placeholder="至少8位"
              minLength={8}
            />
          </div>
          <div>
            <label className="block text-sm text-slate-700 mb-1">Discord ID <span className="text-slate-500">（选填，用于接收信号）</span></label>
            <input
              type="text" value={discordId} onChange={e => setDiscordId(e.target.value)}
              className="w-full bg-white border border-slate-200 rounded-lg px-3 py-2 text-slate-900 text-sm focus:outline-none focus:border-cyan-500"
              placeholder="例：123456789012345678"
            />
          </div>
          {error && <p className="text-red-400 text-sm">{error}</p>}
          <button
            type="submit" disabled={loading}
            className="w-full bg-cyan-600 hover:bg-cyan-500 disabled:opacity-50 text-white font-medium py-2 rounded-lg text-sm transition-colors"
          >
            {loading ? "注册中..." : "注册"}
          </button>
        </form>
        <p className="text-center text-sm text-slate-500">
          已有账号？<a href="/login" className="text-blue-600 hover:underline">登录</a>
        </p>
      </div>
    </div>
  );
}