import React from 'react';
import { ContentTemplate } from '@/components/templates';
import { Button, Icon } from '@/components/atoms';
import { isAuthed } from '@/services/auth';
import { getTask, grabTask } from '@/services/tasks';
import '@/styles/tasks.css';

const MODE = { grab: '抢单', bid: '投标', assign: '指派', recommend: '推荐' };
const money = (a, b) => (a || b) ? (a && b && a !== b ? `¥${a}–${b}` : `¥${a || b}`) : '面议';
const getId = () => new URLSearchParams((window.location.hash.split('?')[1] || '')).get('id');

export default function TaskDetail() {
  const [task, setTask] = React.useState(null);
  const [err, setErr] = React.useState('');
  const [loaded, setLoaded] = React.useState(false);
  const [busy, setBusy] = React.useState(false);

  React.useEffect(() => {
    getId() && getTask(getId()).then((t) => { setTask(t || null); setLoaded(true); });
  }, []);

  const reasons = Array.isArray(task && task.accept_reasons) ? task.accept_reasons : [];
  const can = task && task.can_accept; // true/false/undefined

  const onGrab = async () => {
    if (!isAuthed()) { setErr('抢单需先登录（OPC 端身份）。'); return; }
    setBusy(true); setErr('');
    const r = await grabTask(task.id);
    setBusy(false);
    if (r.ok) setErr('抢单成功，可在「我的接单」查看。');
    else setErr(r.error || '抢单失败');
  };

  if (!loaded) return <ContentTemplate><div className="tk-page"><p className="tk-empty">加载中…</p></div></ContentTemplate>;
  if (!task) return <ContentTemplate><div className="tk-page"><p className="tk-empty">任务不存在或已下线。</p></div></ContentTemplate>;

  return (
    <ContentTemplate>
      <section className="tk-page">
        <a className="tk-back" href="#/tasks"><Icon name="arrow-left" size="sm" />返回任务广场</a>
        <article className="tk-detail">
          <div className="tk-detail-head">
            <div className="tk-cat-row">
              <span className="tk-cat">{task.category || '综合'}</span>
              <span className="tk-mode">{MODE[task.mode] || '抢单'}</span>
              {task.exclusive && <span className="tk-excl">独占</span>}
              <span className="tk-status">{task.status === 'published' ? '待接单' : task.status}</span>
              {can === true && <span className="tk-can">✓ 你可抢</span>}
              {can === false && <span className="tk-nocan" title={reasons.join('；')}>条件不符</span>}
            </div>
            <h1 className="tk-detail-title">{task.title}</h1>
            {task.task_code && <span className="tk-code">短码 {task.task_code}</span>}
          </div>

          <div className="tk-detail-grid">
            <div className="tk-detail-main">
              <h2 className="tk-sec">任务说明</h2>
              <p className="tk-full-desc">{task.description}</p>
              {task.tags && <div className="tk-tags">{String(task.tags).split(',').filter(Boolean).map((x) => <span className="tk-tag" key={x}>{x}</span>)}</div>}
            </div>
            <aside className="tk-detail-side">
              <dl className="tk-facts">
                <div className="tk-fact"><dt>预算</dt><dd className="money">{money(task.budget_min, task.budget_max)}</dd></div>
                <div className="tk-fact"><dt>分类</dt><dd>{task.category}{task.sub_category ? ` · ${task.sub_category}` : ''}</dd></div>
                <div className="tk-fact"><dt>接单模式</dt><dd>{MODE[task.mode] || task.mode}</dd></div>
                <div className="tk-fact"><dt>截止</dt><dd>{task.deadline || '面议'}</dd></div>
                <div className="tk-fact"><dt>交付时限</dt><dd>{task.delivery_days ? `${task.delivery_days} 天` : '面议'}</dd></div>
                <div className="tk-fact"><dt>接单人数</dt><dd>{task.headcount ? `${task.headcount} 人` : '不限'}</dd></div>
                {task.publisher_name ? <div className="tk-fact"><dt>发包方</dt><dd>{task.publisher_name}</dd></div> : null}
              </dl>
              <div className="tk-detail-actions">
                {can === false ? (
                  <>
                    <Button variant="ghost" disabled>暂不可抢</Button>
                    <p className="tk-note tk-why">{reasons.join('；')}</p>
                  </>
                ) : (
                  <Button variant="cta" onClick={onGrab} loading={busy}>{task.mode === 'bid' ? '报名' : '抢单'}</Button>
                )}
                {err && <p className="tk-err">{err}</p>}
                {!isAuthed() && <p className="tk-note">抢单/报名需登录，<a href="#/profile">去登录 / 注册</a>。</p>}
              </div>
            </aside>
          </div>
        </article>
      </section>
    </ContentTemplate>
  );
}