/**
 * 登录页(ADR-010)—— 两份原型都没有这一屏,是新造的。
 *
 * 它在两个台面**之前**渲染,拿不到任一台面的皮肤(工作台补充样式通篇作用域 `.proto-root`,
 * 治理台压根不加载它),所以视觉全部由 `login.css` 自带 —— 类名一律 `jc-login-*`,
 * 不蹭原型的类,免得在另一台面上落空。
 */
import { useState } from 'react';
import type { Session } from '@contracts';
import { loginRoute } from '@contracts';
import { Ico } from '@web-shared/Ico.tsx';
import { ApiCallError, call } from '@web-shared/typed-fetch.ts';

export function LoginPage({ onLogin }: { onLogin(session: Session): void }) {
  const [account, setAccount] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState<string>();
  const [busy, setBusy] = useState(false);

  const ready = account.trim() !== '' && password !== '';

  const submit = async () => {
    if (!ready || busy) return;
    setBusy(true);
    setError(undefined);
    try {
      onLogin(await call<Session>(loginRoute, { body: { account: account.trim(), password } }));
    } catch (e) {
      // 后端只回一句话(不区分账号不存在 / 已停用 / 口令错),这里照实呈现,不替它猜
      setError(e instanceof ApiCallError ? e.message : '登录失败,请稍后再试');
      setBusy(false);
    }
  };

  return (
    <div className="jc-login">
      <form
        className="jc-login-card"
        onSubmit={(e) => {
          e.preventDefault();
          void submit();
        }}
      >
        <span className="jc-login-mark">
          <Ico name="bot" s={24} />
        </span>
        <h1 className="jc-login-title">JCAI 任务操作系统</h1>
        <p className="jc-login-sub">登录后进入你的工位</p>

        <label className="jc-login-field">
          <span>账号</span>
          <input
            value={account}
            autoFocus
            autoComplete="username"
            placeholder="如 fengbing"
            onChange={(e) => setAccount(e.target.value)}
          />
        </label>
        <label className="jc-login-field">
          <span>口令</span>
          <input
            type="password"
            value={password}
            autoComplete="current-password"
            placeholder="口令"
            onChange={(e) => setPassword(e.target.value)}
          />
        </label>

        {error !== undefined && (
          <div className="jc-login-err" role="alert">
            <Ico name="alert-circle" s={15} />
            <p>{error}</p>
          </div>
        )}

        <button className="jc-login-go" type="submit" disabled={busy || !ready}>
          {busy ? '登录中…' : '登录'}
        </button>
        <p className="jc-login-hint">初始口令由部署时的 JCAI_SEED_PASSWORD 决定</p>
      </form>
    </div>
  );
}