import { SearchableSelect } from '../components/SearchableSelect';
import { useEffect, useState } from 'react';
import type { FormEvent } from 'react';
import { Link, useSearchParams } from 'react-router';
import { Alert, EmptyState, LoadingBlock, errorMessage } from '../components/Feedback';
import { Icon } from '../components/Icon';
import { useOperationalContext } from '../context/OperationalContext';
import { DocumentCenterTabs } from '../features/documents/DocumentCenterTabs';
import { inspectionActStatusClass, inspectionActStatusLabel } from '../features/inspections/inspectionActPresentation';
import { OperationalFilters } from '../features/inspections/OperationalFilters';
import type { PageMeta } from '../lib/api';
import {
  listInspectionActsGlobalF4,
  type InspectionActListItemF4,
  type InspectionActStatusF4,
} from '../lib/inspectionActF4Api';
import { formatDate } from '../lib/format';

const statuses: Array<{ value: InspectionActStatusF4 | ''; label: string }> = [
  { value: '', label: 'Todos los estados' },
  { value: 'DRAFT', label: 'Borrador' },
  { value: 'LOCKED', label: 'Bloqueada · esperando manifestación' },
  { value: 'SEALED', label: 'Sellada' },
  { value: 'CANCELLED', label: 'Cancelada' },
  { value: 'READY', label: 'Lista para cerrar · legado' },
  { value: 'CLOSED', label: 'Cerrada · legado' },
  { value: 'RECTIFIED', label: 'Rectificada · legado' },
];

function contextLabel(items: Array<{ name: string }>, empty: string): string {
  if (items.length === 0) return empty;
  const first = items[0];
  if (!first) return empty;
  if (items.length === 1) return first.name;
  return `${first.name} +${items.length - 1}`;
}

export function ActsPage() {
  const [params, setParams] = useSearchParams();
  const operationalContext = useOperationalContext();
  const [items, setItems] = useState<InspectionActListItemF4[]>([]);
  const [meta, setMeta] = useState<PageMeta>({ page: 1, pageSize: 25, total: 0, totalPages: 0 });
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');
  const search = params.get('search') ?? '';
  const rawStatus = params.get('status') ?? '';
  const status = statuses.some((item) => item.value === rawStatus)
    ? rawStatus as InspectionActStatusF4 | ''
    : '';
  const year = params.get('year') ?? '';
  const companyId = operationalContext.companyId || params.get('companyId') || '';
  const areaId = operationalContext.areaId || params.get('areaId') || '';
  const inspectorId = params.get('inspectorId') ?? '';
  const dateFrom = params.get('dateFrom') ?? '';
  const dateTo = params.get('dateTo') ?? '';
  const page = Math.max(1, Number(params.get('page') ?? 1) || 1);
  const [draftSearch, setDraftSearch] = useState(search);

  useEffect(() => {
    setLoading(true);
    setError('');
    listInspectionActsGlobalF4({ page, pageSize: 25, search, status, year: year ? Number(year) : '', companyId, areaId, inspectorId, dateFrom, dateTo })
      .then((response) => {
        setItems(response.data);
        setMeta(response.meta);
      })
      .catch((requestError) => setError(errorMessage(requestError)))
      .finally(() => setLoading(false));
  }, [page, search, status, year, companyId, areaId, inspectorId, dateFrom, dateTo]);

  const setFilter = (key: string, value: string) => {
    const next = new URLSearchParams(params);
    if (key === 'areaId') {
      operationalContext.setAreaId(value);
      next.delete('areaId');
      next.delete('companyId');
    } else if (key === 'companyId') {
      operationalContext.setCompanyId(value);
      next.delete('companyId');
    } else {
      value ? next.set(key, value) : next.delete(key);
    }
    next.delete('page');
    setParams(next);
  };

  const applySearch = (event: FormEvent) => {
    event.preventDefault();
    setFilter('search', draftSearch.trim());
  };

  const setPage = (value: number) => {
    const next = new URLSearchParams(params);
    value > 1 ? next.set('page', String(value)) : next.delete('page');
    setParams(next);
  };

  return <section>
    <div className="page-heading">
      <div><span className="eyebrow">CENTRO DOCUMENTAL</span><h1>Actas</h1><p>Consulta global de actas con acceso a la inspección, hallazgos, inventario e informe relacionado.</p></div>
    </div>
    <DocumentCenterTabs />

    <form className="toolbar survey-toolbar" onSubmit={applySearch}>
      <label className="search-field"><Icon name="search" /><input value={draftSearch} onChange={(event) => setDraftSearch(event.target.value)} placeholder="Buscar acta, inspección, empresa, área o elemento" /><button>Buscar</button></label>
      <label className="select-field"><span>Estado</span><SearchableSelect value={status} onChange={(event) => setFilter('status', event.target.value)}>{statuses.map((item) => <option key={item.value || 'all'} value={item.value}>{item.label}</option>)}</SearchableSelect></label>
      <label className="select-field"><span>Año</span><input inputMode="numeric" value={year} onChange={(event) => setFilter('year', event.target.value.replace(/\D/g, '').slice(0, 4))} placeholder="Todos" /></label>
      <OperationalFilters inspectorId={inspectorId} dateFrom={dateFrom} dateTo={dateTo} onChange={setFilter} />
    </form>

    {error && <Alert>{error}</Alert>}
    {loading ? <LoadingBlock label="Cargando actas…" /> : items.length === 0 ? <EmptyState title="Sin actas" text="No hay actas para los filtros seleccionados." /> : <div className="table-panel document-table">
      <div className="table-summary"><strong>{meta.total} acta{meta.total === 1 ? '' : 's'}</strong><span>Página {page} de {Math.max(meta.totalPages, 1)}</span></div>
      <div className="table-scroll"><table><thead><tr><th>Acta</th><th>Empresa / área</th><th>Inspección</th><th>Hallazgos</th><th>Estado</th><th>Informe</th><th /></tr></thead><tbody>{items.map((act) => <tr key={act.id}>
        <td><div className="document-primary"><strong>{act.code}</strong><small>{act.title} · {formatDate(act.occurredAt)}</small></div></td>
        <td><div className="document-primary"><strong>{contextLabel(act.companies, 'Empresa sin asignar')}</strong><small>{contextLabel(act.areas, 'Área sin asignar')}</small></div></td>
        <td><Link className="text-link" to={`/inspecciones/${act.visitId}`}>{act.visit.code}</Link></td>
        <td><Link className="text-link" to={`/hallazgos?search=${encodeURIComponent(act.code)}`}>{act.findingCount}</Link></td>
        <td><span className={`status-badge ${inspectionActStatusClass(act.status)}`}>{inspectionActStatusLabel(act.status)}</span></td>
        <td>{act.report ? <Link className="text-link" to={`/informes/${act.report.id}`}>{act.report.code}<small className="block-muted">{act.report.pdfStatus === 'READY' ? 'PDF disponible' : 'PDF pendiente'}</small></Link> : ['SEALED', 'CLOSED'].includes(act.status) ? <span className="status-badge pending">Pendiente de emisión</span> : <span className="muted">—</span>}</td>
        <td className="action-cell"><Link className="icon-button" to={`/inspecciones/actas/${act.id}`} aria-label={`Abrir ${act.code}`}><Icon name="chevron" /></Link></td>
      </tr>)}</tbody></table></div>
      <div className="pagination"><button className="button secondary" disabled={page <= 1} onClick={() => setPage(page - 1)}>Anterior</button><span>{meta.total ? `${(page - 1) * meta.pageSize + 1}–${Math.min(page * meta.pageSize, meta.total)} de ${meta.total}` : '0 resultados'}</span><button className="button secondary" disabled={page >= meta.totalPages} onClick={() => setPage(page + 1)}>Siguiente</button></div>
    </div>}
  </section>;
}