// sources.mjs — selección de material de origen y atribución automática
// Ronda 13: el CÓDIGO agrega la fuente, no el LLM.
import { readFileSync } from 'node:fs'
import { createRequire } from 'node:module'
const require_ = createRequire(import.meta.url)

let _pool = null
function pool() {
  if (!_pool) {
    const pg = require_('/srv/cayce-core/node_modules/pg')
    const env = Object.fromEntries(
      readFileSync('/srv/hardcap-news/backend/.env', 'utf8').split('\n').filter(l => l.includes('=')).map(l => [l.slice(0, l.indexOf('=')), l.slice(l.indexOf('=') + 1)])
    )
    _pool = new pg.Pool({ connectionString: env.DATABASE_URL })
  }
  return _pool
}

export async function selectSource(topic = null) {
  const p = pool()
  const q = topic
    ? `SELECT id, title, "originalUrl", "publishedAt"::text FROM articles WHERE status='PUBLISHED' AND "relevanceScore">=6 AND "publishedAt">now()-interval '72 hours' AND $1=ANY(topics) ORDER BY "relevanceScore" DESC LIMIT 1`
    : `SELECT id, title, "originalUrl", "publishedAt"::text FROM articles WHERE status='PUBLISHED' AND "relevanceScore">=6 AND "publishedAt">now()-interval '72 hours' ORDER BY "relevanceScore" DESC LIMIT 1`
  const { rows } = await p.query(q, topic ? [topic] : [])
  return rows[0] || null
}

export async function selectBatch(n = 5, topic = null) {
  const p = pool()
  const q = topic
    ? `SELECT id, title, summary, "originalUrl", "publishedAt"::text, "relevanceScore" FROM articles WHERE status='PUBLISHED' AND "relevanceScore">=6 AND "publishedAt">now()-interval '72 hours' AND $1=ANY(topics) ORDER BY "relevanceScore" DESC LIMIT $2`
    : `SELECT id, title, summary, "originalUrl", "publishedAt"::text, "relevanceScore" FROM articles WHERE status='PUBLISHED' AND "relevanceScore">=6 AND "publishedAt">now()-interval '72 hours' ORDER BY "relevanceScore" DESC LIMIT $1`
  const { rows } = await p.query(q, topic ? [topic, n] : [n])
  return rows
}

export function attribute(source) {
  if (!source) return ''
  const date = (source.publishedAt || '').slice(0, 10) || new Date().toISOString().slice(0, 10)
  return `\n\n— fuente: ${source.originalUrl} · ${date}`
}

export function attributeURL(url, dateStr) {
  return `\n\n— fuente: ${url} · ${dateStr}`
}