/**
 * The ONE search index — Cmd+K AND Q0 « déjà décidé ? » (same index, by
 * doctrine): clauses (code + title), decisions (title), mandates (title).
 * Case- and accent-insensitive. Pure selector over the collective store.
 *
 * EXPLICIT imports (no Nuxt auto-imports) — testable under plain vitest.
 */

import type { Id } from '../types/domain'
import { STATUS_LABELS } from '../lexicon'
import { useCollectiveStore } from '../stores/collective'

export interface SearchHit {
  kind: 'clause' | 'decision' | 'mandate'
  id: Id
  label: string
  sublabel: string
}

const MAX_HITS = 20

/** Case/accent-insensitive folding (same folding as the stores). */
function fold(text: string): string {
  return text.normalize('NFD').replace(/[̀-ͯ]/g, '').toLowerCase()
}

export function useSearch() {
  const col = useCollectiveStore()

  /** Search the unique index. Empty (or blank) query ⇒ no hit. */
  const search = (query: string): SearchHit[] => {
    const needle = fold(query.trim())
    if (needle.length === 0) return []
    const hits: SearchHit[] = []

    for (const clause of col.clauses) {
      if (hits.length >= MAX_HITS) break
      if (fold(clause.code).includes(needle) || fold(clause.title).includes(needle)) {
        const doc = col.docs.find(d => d.id === clause.docId)
        hits.push({
          kind: 'clause',
          id: clause.id,
          label: `${clause.code} — ${clause.title}`,
          sublabel: doc?.title ?? '',
        })
      }
    }

    for (const decision of col.decisions) {
      if (hits.length >= MAX_HITS) break
      if (fold(decision.title).includes(needle)) {
        hits.push({
          kind: 'decision',
          id: decision.id,
          label: decision.title,
          sublabel: STATUS_LABELS[decision.status],
        })
      }
    }

    for (const mandate of col.mandates) {
      if (hits.length >= MAX_HITS) break
      if (fold(mandate.title).includes(needle)) {
        const holder = col.people.find(p => p.id === mandate.holderId)
        hits.push({
          kind: 'mandate',
          id: mandate.id,
          label: mandate.title,
          sublabel: holder?.displayName ?? '',
        })
      }
    }

    return hits
  }

  return { search }
}