import { useEffect, useState } from 'react';
import type { FormEvent } from 'react';
import { Link, useSearchParams } from 'react-router';
import { PermissionGate } from '../auth/PermissionGate';
import { Alert, EmptyState, LoadingBlock, errorMessage } from '../components/Feedback';
import { Icon } from '../components/Icon';
import { useOperationalContext } from '../context/OperationalContext';
import { OperationalFilters } from '../features/inspections/OperationalFilters';
import {
  INSPECTION_VISIT_STATUSES,
  inspectionStatusClass,
  inspectionVisitStatusLabel,
} from '../features/inspections/inspectionPresentation';
import { listInspectionVisits } from '../lib/api';
import type {
  InspectionVisitListItem,
  InspectionVisitStatus,
  PageMeta,
} from '../lib/api';
import { formatDate } from '../lib/format';

const statusTabs: Array<{ value: InspectionVisitStatus | ''; label: string }> = [
  { value: '', label: 'Todas' },
  ...INSPECTION_VISIT_STATUSES,
];

export function InspectionVisitsPage() {
  const [urlParams, setUrlParams] = useSearchParams();
  const context = useOperationalContext();
  const [visits, setVisits] = useState<InspectionVisitListItem[]>([]);
  const [meta, setMeta] = useState<PageMeta>({ page: 1, pageSize: 25, total: 0, totalPages: 0 });
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');
  const [draftSearch, setDraftSearch] = useState(urlParams.get('search') ?? '');
  const search = urlParams.get('search') ?? '';
  const rawStatus = urlParams.get('status') ?? '';
  const status = INSPECTION_VISIT_STATUSES.some((item) => item.value === rawStatus)
    ? rawStatus as InspectionVisitStatus
    : '';
  const companyId = context.companyId || urlParams.get('companyId') || '';
  const areaId = context.areaId || urlParams.get('areaId') || '';
  const inspectorId = urlParams.get('inspectorId') ?? '';
  const dateFrom = urlParams.get('dateFrom') ?? '';
  const dateTo = urlParams.get('dateTo') ?? '';
  const page = Math.max(1, Number(urlParams.get('page') ?? 1) || 1);

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

  const updateFilter = (key: string, value: string) => {
    const next = new URLSearchParams(urlParams);
    if (key === 'areaId') {
      context.setAreaId(value);
      next.delete('areaId');
      next.delete('companyId');
    } else if (key === 'companyId') {
      context.setCompanyId(value);
      next.delete('companyId');
    } else {
      value ? next.set(key, value) : next.delete(key);
    }
    next.delete('page');
    setUrlParams(next);
  };

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

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

  const statusHref = (value: InspectionVisitStatus | '') => {
    const next = new URLSearchParams(urlParams);
    value ? next.set('status', value) : next.delete('status');
    next.delete('page');
    return `/inspecciones${next.size ? `?${next}` : ''}`;
  };

  return <section>
    <div className="page-heading">
      <div><span className="eyebrow">OPERACIÓN</span><h1>Inspecciones</h1><p>Planificá, seguí y consultá todo el ciclo de una inspección desde un único lugar.</p></div>
      <PermissionGate permission="inspections.manage"><PermissionGate permission="inspections.assign"><Link className="button primary" to="/inspecciones/nueva"><Icon name="plus" />Planificar inspección</Link></PermissionGate></PermissionGate>
    </div>

    <nav className="inspection-status-tabs" aria-label="Estados de inspección">
      {statusTabs.map((item) => <Link key={item.value || 'all'} className={status === item.value ? 'active' : ''} to={statusHref(item.value)}>{item.label}</Link>)}
    </nav>

    <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 por código" /><button>Buscar</button></label>
      <OperationalFilters inspectorId={inspectorId} dateFrom={dateFrom} dateTo={dateTo} onChange={updateFilter} />
    </form>

    {error && <Alert>{error}</Alert>}
    {loading ? <LoadingBlock label="Cargando inspecciones…" /> : visits.length === 0 ? <EmptyState title="Sin inspecciones" text="No hay inspecciones que coincidan con el estado y contexto seleccionados." /> : <div className="table-panel"><div className="table-summary"><strong>{meta.total} inspección{meta.total === 1 ? '' : 'es'}</strong><span>Página {page} de {Math.max(meta.totalPages, 1)}</span></div><div className="table-scroll"><table><thead><tr><th>Inspección</th><th>Estado</th><th>Área / Operadora</th><th>Responsable</th><th>Fecha prevista</th><th>Inventario</th><th /></tr></thead><tbody>{visits.map((visit) => <tr key={visit.id}><td><div className="asset-cell"><span className="asset-symbol"><Icon name="clipboard" size={17} /></span><div><strong>{visit.code}</strong><small>{visit.operationalArea?.name ?? 'Sin Área'} · {visit.operatorCompany?.name ?? 'Sin Operadora'}</small></div></div></td><td><span className={`status-badge ${inspectionStatusClass(visit.status)}`}>{inspectionVisitStatusLabel(visit.status)}</span></td><td>{visit.operationalArea || visit.operatorCompany ? <span><strong className="table-primary">{visit.operationalArea?.name ?? 'Sin Área'}</strong><small className="cell-subtext">{visit.operatorCompany?.name ?? 'Sin Operadora'}</small></span> : <span className="muted">Sin contexto</span>}</td><td>{visit.leadInspector ? `${visit.leadInspector.firstName} ${visit.leadInspector.lastName}` : 'Sin asignar'}</td><td><span className="survey-date-range">{formatDate(visit.plannedStartAt)}<small>inicio planificado</small></span></td><td>{visit.scopeAsset ? <Link className="text-link" to={`/inventarios/${visit.scopeAsset.id}`}>{visit.scopeAsset.name}<small className="block-muted">{visit.scopeAsset.code}</small></Link> : <><strong>{visit.assetCount} registro{visit.assetCount === 1 ? '' : 's'}</strong><small className="block-muted">{visit.memberCount} integrante{visit.memberCount === 1 ? '' : 's'}</small></>}</td><td className="action-cell"><Link className="icon-button" to={`/inspecciones/${visit.id}`} aria-label={`Abrir ${visit.code}`}><Icon name="chevron" /></Link></td></tr>)}</tbody></table></div><div className="pagination"><button className="button secondary" disabled={page <= 1} onClick={() => setPage(page - 1)}>Anterior</button><span>{meta.total ? `${(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>;
}