/**
 * Shared RAG query utility for the Drafting Engine.
 *
 * Queries the DSFA RAG corpus via klausur-service for relevant legal context.
 * Used by both chat and draft routes.
 */

const KLAUSUR_SERVICE_URL = process.env.KLAUSUR_SERVICE_URL || 'http://klausur-service:8086'

/**
 * Query the RAG corpus for relevant legal documents.
 *
 * @param query - The search query (e.g. "DSFA Art. 35 DSGVO")
 * @param topK - Number of results to return (default: 3)
 * @returns Formatted string of legal context, or empty string on error
 */
export async function queryRAG(query: string, topK = 3): Promise<string> {
  try {
    const url = `${KLAUSUR_SERVICE_URL}/api/v1/dsfa-rag/search?query=${encodeURIComponent(query)}&top_k=${topK}`
    const res = await fetch(url, {
      headers: { 'Content-Type': 'application/json' },
      signal: AbortSignal.timeout(10000),
    })

    if (!res.ok) return ''

    const data = await res.json()
    if (data.results?.length > 0) {
      return data.results
        .map(
          (r: { source_name?: string; source_code?: string; content?: string }, i: number) =>
            `[Quelle ${i + 1}: ${r.source_name || r.source_code || 'Unbekannt'}]\n${r.content || ''}`
        )
        .join('\n\n---\n\n')
    }
    return ''
  } catch {
    return ''
  }
}