import { useMemo } from 'react';
import { useApp } from '../../app/AppProvider';
import type { DatasetSheet, ImportedDataset } from '../../domain/dataset';
import type { ImportProfile } from '../../domain/import-profile';
import type { Review } from '../../domain/review';
import { measureNavigationStep } from '../../app/navigation-diagnostics';
import { SECURITY_DOMAIN_FACET_ID, securityDomainCatalog } from '../dashboard/security-domains';
import { type DynamicFacetFilters } from '../search-filter/dynamic-facets';
import { selectWorkFacets } from '../search-filter/work-facets';
import type { ContextClusterIndex } from '../context-layer/context-cluster-facet';
import { useContextClusterIndex } from '../context-layer/use-context-cluster-index';
import { businessImpactControls, BUSINESS_IMPACT_FACET_ID } from '../search-filter/business-impact-controls';
import { useEnginePreferences } from '../../app/engine-preferences';

interface SecurityDomainOptions {
  sheet: DatasetSheet | undefined;
  dataset: ImportedDataset | null;
  activeProfile: ImportProfile;
  reviews: Record<string, Review>;
  statusFilter: string;
  facetFilters: DynamicFacetFilters;
  pathFindingIds?: readonly string[];
  search: string;
  actionOnly: boolean;
  contextClusters?: ContextClusterIndex;
}

export interface SidebarSecurityDomain {
  id: string;
  label: string;
  count: number;
}

export interface SidebarSecurityDomainSummary {
  facetId: typeof SECURITY_DOMAIN_FACET_ID;
  domains: SidebarSecurityDomain[];
}

/** Uses the exact shared Client Info facet, ordering and self-excluding counts. */
export function summarizeSecurityDomains(options: SecurityDomainOptions): SidebarSecurityDomainSummary | undefined {
  const { sheet, dataset, activeProfile, reviews, statusFilter, facetFilters, pathFindingIds, search, actionOnly, contextClusters } = options;
  if (!sheet) return undefined;

  const facets = selectWorkFacets(sheet, {
    dataset, activeProfile, reviews, statusFilter, facetFilters, pathFindingIds, search, actionOnly, contextClusters
  });
  const domainFacet = facets.find(facet => facet.id === SECURITY_DOMAIN_FACET_ID);
  if (!domainFacet) return undefined;

  const counts = new Map(domainFacet.values.map(value => [value.value, value.count]));
  const domains: SidebarSecurityDomain[] = securityDomainCatalog.map(domain => ({
    id: domain.id,
    label: domain.label,
    count: counts.get(domain.id) ?? 0
  }));
  return { facetId: SECURITY_DOMAIN_FACET_ID, domains };
}

export function toggleSecurityDomainSelection(selected: string[], domainId: string): string[] {
  return selected.includes(domainId) ? [] : [domainId];
}

export function SidebarSecurityDomains({ sheet }: { sheet: DatasetSheet | undefined }) {
  const {
    dataset,
    activeProfile,
    reviews,
    statusFilter,
    facetFilters,
    pathFindingIds,
    search,
    actionOnly,
    setFacetFilter,
    setStatusFilter
  } = useApp();
  const contextClusters = useContextClusterIndex();
  const engines = useEnginePreferences();
  const impactCounts = useMemo(() => {
    if (!engines.report || !engines.context || !contextClusters) return undefined;
    const facet = selectWorkFacets(sheet, { dataset, activeProfile, reviews, statusFilter: 'deviation', facetFilters,
      pathFindingIds, search, actionOnly, contextClusters }).find(item => item.id === BUSINESS_IMPACT_FACET_ID);
    if (!facet) return undefined;
    const counts = new Map(facet.values.map(value => [value.value, value.count]));
    return businessImpactControls.map(theme => ({ ...theme, count: counts.get(theme.id) ?? 0 }));
  }, [engines.report, engines.context, contextClusters, sheet, dataset, activeProfile, reviews, facetFilters, pathFindingIds, search, actionOnly]);
  const summary = useMemo(() => measureNavigationStep('security-domain-summary', () => summarizeSecurityDomains({
    sheet,
    dataset,
    activeProfile,
    reviews,
    statusFilter,
    facetFilters,
    pathFindingIds,
    search,
    actionOnly,
    contextClusters
  })), [actionOnly, activeProfile, contextClusters, dataset, facetFilters, pathFindingIds, reviews, search, sheet, statusFilter]);
  if (!summary) return null;

  const selected = facetFilters[summary.facetId]?.values ?? [];
  return (
    <section className="sidebar-domain-rack" aria-labelledby="sidebar-domain-heading">
      <h2 id="sidebar-domain-heading">Security Domains</h2>
      {summary.domains.map(domain => {
        const active = selected.includes(domain.id);
        return <button
          aria-label={`${domain.label}: ${domain.count.toLocaleString('en-US')}`}
          aria-pressed={active}
          className="sidebar-domain-button"
          key={domain.id}
          type="button"
          onClick={() => {
            const next = toggleSecurityDomainSelection(selected, domain.id);
            setFacetFilter(summary.facetId, next.length ? { values: next } : null);
          }}
        >
          <span>{domain.label}</span>
          <strong>{domain.count.toLocaleString('en-US')}</strong>
        </button>;
      })}
      {impactCounts && <section className="sidebar-business-impact" aria-labelledby="sidebar-business-impact-heading">
        <h2 id="sidebar-business-impact-heading">Possible Business Impact</h2>
        {impactCounts.map(theme => {
          const active = facetFilters[BUSINESS_IMPACT_FACET_ID]?.values?.includes(theme.id) ?? false;
          return <button type="button" className="sidebar-domain-button" key={theme.id} aria-pressed={active}
            aria-label={`${theme.label}: ${theme.count.toLocaleString('en-US')}`} disabled={!active && theme.count === 0}
            onClick={() => {
              setStatusFilter('deviation');
              setFacetFilter(BUSINESS_IMPACT_FACET_ID, active ? null : { values: [theme.id] });
            }}><span>{theme.label}</span><strong>{theme.count.toLocaleString('en-US')}</strong></button>;
        })}
      </section>}
    </section>
  );
}