import { useEffect, useState } from 'react';
import Button from '../../components/Button';
import Input from '../../components/Input';
import Select from '../../components/Select';
import DataTable from '../../components/DataTable';
import Modal from '../../components/Modal';
import { groupsApi, usersApi, errMsg } from '../../api';
import { formatDateRange } from '../../utils/export';
import type { UserItem, UserDetail, WorkGroup } from '../../types';
import { IconUsers, IconPlus, IconEdit, IconTrash, IconEye } from '../../components/Icons';

type Form = { class: string; name: string; volunteer_no: string; group_id: number | null };
const emptyForm: Form = { class: '', name: '', volunteer_no: '', group_id: null };

export default function Users() {
  const [list, setList] = useState<UserItem[]>([]);
  const [groups, setGroups] = useState<WorkGroup[]>([]);
  const [loading, setLoading] = useState(false);
  const [keyword, setKeyword] = useState('');
  const [modalOpen, setModalOpen] = useState(false);
  const [form, setForm] = useState<Form>(emptyForm);
  const [editId, setEditId] = useState<number | null>(null);
  const [error, setError] = useState('');
  const [detailOpen, setDetailOpen] = useState(false);
  const [detail, setDetail] = useState<UserDetail | null>(null);

  const load = async () => {
    setLoading(true);
    try {
      const [u, g] = await Promise.all([usersApi.list(), groupsApi.list()]);
      setList(u);
      setGroups(g);
    } finally {
      setLoading(false);
    }
  };
  useEffect(() => { load(); }, []);

  const filtered = list.filter(u => {
    if (!keyword.trim()) return true;
    const k = keyword.trim().toLowerCase();
    return [u.name, u.class, u.volunteer_no, u.group_name || ''].some(s => String(s || '').toLowerCase().includes(k));
  });

  const openNew = () => { setForm(emptyForm); setEditId(null); setError(''); setModalOpen(true); };
  const openEdit = (u: UserItem) => {
    setForm({ class: u.class, name: u.name, volunteer_no: u.volunteer_no || '', group_id: u.group_id });
    setEditId(u.id); setError(''); setModalOpen(true);
  };
  const onDelete = (u: UserItem) => {
    if (!confirm(`确认删除部员「${u.class} ${u.name}」？其所有时长登记也会一并删除。`)) return;
    usersApi.remove(u.id).then(load).catch(e => alert(errMsg(e)));
  };
  const openDetail = async (u: UserItem) => {
    try { const d = await usersApi.detail(u.id); setDetail(d); setDetailOpen(true); } catch (e) { alert(errMsg(e)); }
  };

  const submit = async () => {
    if (!form.class.trim() || !form.name.trim()) { setError('班级与姓名不能为空'); return; }
    try {
      const payload = { ...form, volunteer_no: form.volunteer_no.trim() || null, group_id: form.group_id || null };
      if (editId) await usersApi.update(editId, payload);
      else await usersApi.create(payload);
      setModalOpen(false);
      load();
    } catch (e) { setError(errMsg(e)); }
  };

  return (
    <div>
      <div className="mb-5 flex items-start gap-2">
        <div className="shrink-0 p-2 bg-primary-50 text-primary-600 rounded-md mt-0.5">
          <IconUsers size={26} />
        </div>
        <div>
          <h1 className="section-title">用户管理</h1>
          <p className="muted mt-1">管理部员信息，查看个人累计义工时长与参与活动明细</p>
        </div>
      </div>

      <div className="card p-4 mb-4 flex flex-col md:flex-row gap-3 md:items-center md:justify-between">
        <Input placeholder="搜索 姓名/班级/义工号/工作组..." value={keyword} onChange={(e) => setKeyword(e.target.value)} className="md:max-w-md" />
        <Button onClick={openNew}><span className="inline-flex items-center gap-2"><IconPlus size={18} />新增部员</span></Button>
      </div>

      <DataTable<UserItem>
        columns={[
          { key: 'class', title: '班级', width: '120px', render: (r) => <span className="whitespace-nowrap">{r.class}</span> },
          { key: 'name', title: '姓名', render: (r) => <span className="font-semibold">{r.name}</span> },
          { key: 'volunteer_no', title: '义工号', render: (r) => r.volunteer_no || '—' },
          { key: 'group_name', title: '所属工作组', render: (r) => r.group_name || '—' },
          { key: 'total_hours', title: '累计时长（小时）', render: (r) => <span className="font-semibold text-primary-600">{Number(r.total_hours || 0).toFixed(2)}</span> },
          {
            key: 'op', title: '操作', width: '240px', render: (r) => (
              <div className="flex gap-1.5 flex-wrap">
                <Button size="sm" variant="secondary" onClick={() => openDetail(r)}><span className="inline-flex items-center gap-1.5"><IconEye size={14} />详情</span></Button>
                <Button size="sm" variant="secondary" onClick={() => openEdit(r)}><span className="inline-flex items-center gap-1.5"><IconEdit size={14} />编辑</span></Button>
                <Button size="sm" variant="danger" onClick={() => onDelete(r)}><span className="inline-flex items-center gap-1.5"><IconTrash size={14} />删除</span></Button>
              </div>
            )
          }
        ]}
        data={filtered}
        rowKey={(r) => r.id}
      />

      <Modal open={modalOpen} title={editId ? '编辑部员' : '新增部员'} onClose={() => setModalOpen(false)}
        footer={<><Button variant="secondary" onClick={() => setModalOpen(false)}>取消</Button><Button onClick={submit}>{editId ? '保存修改' : '添加部员'}</Button></>}>
        <div className="space-y-4 max-w-md">
          <div className="grid grid-cols-2 gap-4">
            <div><label className="block text-sm font-semibold mb-1.5">班级 *</label>
              <Input value={form.class} onChange={(e) => setForm({ ...form, class: e.target.value })} placeholder="如：高三(1)班" />
            </div>
            <div><label className="block text-sm font-semibold mb-1.5">姓名 *</label>
              <Input value={form.name} onChange={(e) => setForm({ ...form, name: e.target.value })} />
            </div>
          </div>
          <div><label className="block text-sm font-semibold mb-1.5">义工号</label>
            <Input value={form.volunteer_no} onChange={(e) => setForm({ ...form, volunteer_no: e.target.value })} />
          </div>
          <div><label className="block text-sm font-semibold mb-1.5">所属工作组</label>
            <Select value={String(form.group_id || '')} onChange={(e) => setForm({ ...form, group_id: e.target.value ? Number(e.target.value) : null })}>
              <option value="">-- 不设置 --</option>
              {groups.map(g => <option key={g.id} value={g.id}>{g.name}</option>)}
            </Select>
          </div>
          {error && <div className="text-sm text-red-600">{error}</div>}
        </div>
      </Modal>

      <Modal open={detailOpen} title="部员详情" onClose={() => setDetailOpen(false)} width="max-w-3xl"
        footer={<Button onClick={() => setDetailOpen(false)}>关闭</Button>}>
        {detail && (
          <div className="space-y-5">
            <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
              <div className="card p-3">
                <div className="muted mb-1">姓名</div><div className="font-semibold text-lg text-gray-800">{detail.name}</div>
              </div>
              <div className="card p-3">
                <div className="muted mb-1">班级</div><div className="font-semibold text-gray-800">{detail.class}</div>
              </div>
              <div className="card p-3">
                <div className="muted mb-1">义工号</div><div className="font-semibold text-gray-800">{detail.volunteer_no || '—'}</div>
              </div>
              <div className="card p-3 bg-primary-50/60">
                <div className="muted mb-1">累计时长</div><div className="font-semibold text-lg text-primary-600">{Number(detail.total_hours || 0).toFixed(2)}h</div>
              </div>
            </div>
            <div>
              <h3 className="font-semibold mb-2 text-gray-800">参与的活动（{detail.activities.length} 次）</h3>
              <DataTable columns={[
                { key: 'title', title: '活动名称', render: (r: any) => <span className="font-medium">{r.title}</span> },
                { key: 'time', title: '时间', render: (r: any) => formatDateRange(r.start_time, r.end_time) },
                { key: 'hours', title: '时长', render: (r: any) => <span className="font-semibold text-primary-600">{Number(r.hours || 0).toFixed(2)}h</span> },
                { key: 'remark', title: '备注', render: (r: any) => r.remark || '—' },
              ]} data={detail.activities} rowKey={(r: any) => r.id} />
            </div>
          </div>
        )}
      </Modal>
    </div>
  );
}