export const runtime = 'edge';

import Link from 'next/link';

const API_BASE = process.env.NEXT_PUBLIC_API_BASE ?? 'https://cypher.arcrun.dev';

export default function LoginPage({
  searchParams,
}: {
  searchParams: Promise<{ error?: string; redirect?: string }>;
}) {
  return (
    <LoginContent searchParamsPromise={searchParams} />
  );
}

async function LoginContent({
  searchParamsPromise,
}: {
  searchParamsPromise: Promise<{ error?: string; redirect?: string }>;
}) {
  const params = await searchParamsPromise;
  const error = params.error;
  const redirect = params.redirect ?? '/dashboard';

  const googleUrl = `${API_BASE}/auth/google/start?redirect=${encodeURIComponent(redirect)}`;
  const githubUrl = `${API_BASE}/auth/github/start?redirect=${encodeURIComponent(redirect)}`;

  const errorMessages: Record<string, string> = {
    cancelled: '登入已取消。',
    invalid_state: '安全性驗證失敗，請重試。',
    server_error: '伺服器錯誤，請稍後重試。',
    github_email_required: 'GitHub 帳號需要設定公開 Email 才能登入。',
  };

  return (
    <div className="min-h-screen bg-[#0a0a0a] flex flex-col items-center justify-center px-6">
      {/* Logo */}
      <div className="mb-8 text-center">
        <Link href="/" className="text-white font-bold text-2xl tracking-tight hover:opacity-80 transition-opacity">
          arcrun
        </Link>
      </div>

      {/* Card */}
      <div className="w-full max-w-sm bg-[#111] border border-[#222] rounded-2xl p-8">
        <h1 className="text-xl font-semibold text-white mb-2 text-center">登入或建立帳號</h1>
        <p className="text-[#555] text-sm text-center mb-8">取得您的 API Key，立即開始使用</p>

        {error && (
          <div className="bg-red-950/50 border border-red-900/50 text-red-400 text-sm px-4 py-3 rounded-lg mb-6">
            {errorMessages[error] ?? '登入時發生錯誤，請重試。'}
          </div>
        )}

        <div className="flex flex-col gap-3">
          {/* Google */}
          <a href={googleUrl}
            className="flex items-center justify-center gap-3 bg-white hover:bg-gray-100 text-gray-900 px-4 py-3 rounded-lg font-medium text-sm transition-colors">
            <GoogleIcon />
            Continue with Google
          </a>

          {/* GitHub */}
          <a href={githubUrl}
            className="flex items-center justify-center gap-3 bg-[#24292e] hover:bg-[#2f363d] text-white border border-[#444] px-4 py-3 rounded-lg font-medium text-sm transition-colors">
            <GitHubIcon />
            Continue with GitHub
          </a>
        </div>

        <p className="text-[#444] text-xs text-center mt-6 leading-relaxed">
          登入即表示您同意我們的服務條款。
          不需要信用卡。
        </p>
      </div>

      <Link href="/" className="mt-6 text-[#444] hover:text-[#888] text-sm transition-colors">
        ← 返回首頁
      </Link>
    </div>
  );
}

function GoogleIcon() {
  return (
    <svg width="18" height="18" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
      <path d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z" fill="#4285F4"/>
      <path d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z" fill="#34A853"/>
      <path d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z" fill="#FBBC05"/>
      <path d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z" fill="#EA4335"/>
    </svg>
  );
}

function GitHubIcon() {
  return (
    <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
      <path d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z"/>
    </svg>
  );
}
