// guard.mjs — PUBLISH-GUARD v1 (directiva del propietario 2026-11-01)
// Un solo punto de paso: lo llama gateOutbound() en cayce-core y cayce-social,
// y el gate de publicación de hardcap. Rechaza, registra el motivo, nunca publica.
import { readFileSync } from 'node:fs'

const BLOCKLIST_PATH = process.env.GUARD_BLOCKLIST_PATH || '/srv/cayce-core/guard-blocklist.txt'
export const FORCE_DRAFT_CHANNELS = ['mail', 'proposal', 'dm'] // política 2026-11-01: siempre borrador
const METADATA_TYPES = ['profile', 'contact_list', 'inbox_relays', 'deletion'] // no caps, no formato texto
const DEFAULT_CAPS = { nostr: 3, hardcap: 4, bitcoinhotels: 1, facebook: 1, instagram: 1 }

function caps() {
  try { return { ...DEFAULT_CAPS, ...JSON.parse(process.env.GUARD_CAPS_JSON || '{}') } } catch { return DEFAULT_CAPS }
}
function blocklist() {
  try {
    return readFileSync(BLOCKLIST_PATH, 'utf8').split('\n')
      .map(l => l.trim()).filter(l => l && !l.startsWith('#')).map(l => l.toLowerCase())
  } catch { return [] }
}
const URL_RE = /https?:\/\/[^\s)>"]+/gi
const stripUrls = s => String(s).replace(URL_RE, ' ')

// ── reglas ───────────────────────────────────────────────────────────────────
// politica ronda-7 punto 4.6: R1 aplica SOLO a la voz propia de Cayce.
// Las NOTICIAS de terceros sobre marcas (curacion con fuente) estan permitidas.
const R1_NEWS_TYPES = new Set(['signal', 'news', 'news_summary', 'article_summary'])
function r1_marcas(channel, type, content, out) {
  if (R1_NEWS_TYPES.has(type)) return
  const c = stripUrls(content).toLowerCase()
  for (const b of blocklist()) {
    const re = new RegExp(`(^|[^a-z0-9])${b.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}([^a-z0-9]|$)`, 'i')
    if (re.test(c)) { out.push(`marca-bloqueada:${b}`); return }
  }
}
function r2_formato(content, out) {
  const c = stripUrls(content)
  if (/[?&](aff|ref|refid|refer)=[a-z0-9_-]+|\/ref\/|\/r\/[a-z0-9_-]{2,}|affiliate|referral|amzn\.to|[?&]tag=/i.test(String(content)))
    out.push('enlace-afiliado-o-referido')
  if (/(^|\s)#[a-z0-9_]+/i.test(c)) out.push('hashtag')
  if (/[\u{1F000}-\u{1FAFF}\u{2600}-\u{27BF}\u{FE0F}\u{2B00}-\u{2BFF}\u{2190}-\u{21FF}]/u.test(c)) out.push('emoji')
  if (/!/.test(c)) out.push('signo-de-exclamacion')
}
const DATE_RE = /(\b(19|20)\d{2}[-/.](0?[1-9]|1[0-2])[-/.](0?[1-9]|[12]\d|3[01])\b|\b(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)[a-z]*\.?\s+\d{1,2},?\s+(19|20)\d{2}\b|\b\d{1,2}\s+(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)[a-z]*\.?\s+(19|20)\d{2}\b|\b(19|20)\d{2}\b)/i
const FACT_RE = /(\d+(\.\d+)?\s*(%|usdt|usd|btc|sats?|vb|million|billion|bill|mill)|\b(19|20)\d{2}\b|\b(first|largest|biggest|most|record|all-time|only|highest|lowest|never|first ever)\b)/i
function r3_hechos(content, out) {
  const s = String(content)
  const hasUrl = URL_RE.test(s); URL_RE.lastIndex = 0
  if (FACT_RE.test(s) && (!hasUrl || !DATE_RE.test(s))) out.push('afirmacion-factica-sin-fuente-y-fecha')
}
function r4_duplicado() { /* se resuelve con pool en guardCheck (async) */ }
function shingles(s) {
  const w = stripUrls(s).toLowerCase().replace(/[^a-z0-9áéíóúñ\s]/g, ' ').split(/\s+/).filter(x => x.length > 2)
  const sh = new Set()
  for (let i = 0; i + 2 < w.length; i++) sh.add(w.slice(i, i + 3).join(' '))
  if (!sh.size && w.length) sh.add(w.join(' '))
  return sh
}
function jaccard(a, b) { let i = 0; for (const x of a) if (b.has(x)) i++; return i / (a.size + b.size - i || 1) }
const DUP_THRESHOLD = 0.55

const NEWS_CHANNELS = new Set(['nostr', 'hardcap'])
const FRESH_WINDOW_MS = 72 * 3600e3
function parseDates(s) {
  const ds = []
  const iso = /\b(20\d{2})[-/.](\d{1,2})[-/.](\d{1,2})\b/g
  for (const m of s.matchAll(iso)) ds.push(new Date(+m[1], +m[2] - 1, +m[3]))
  const mon = /\b(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)[a-z]*\.?\s+(\d{1,2}),?\s+(20\d{2})\b/gi
  const MO = { jan: 0, feb: 1, mar: 2, apr: 3, may: 4, jun: 5, jul: 6, aug: 7, sep: 8, oct: 9, nov: 10, dec: 11 }
  for (const m of s.matchAll(mon)) ds.push(new Date(+m[3], MO[m[1].slice(0, 3).toLowerCase()], +m[2]))
  return ds
}
function r7_frescura(channel, content, out) {
  if (!NEWS_CHANNELS.has(channel)) return
  const s = String(content)
  const hasUrl = URL_RE.test(s); URL_RE.lastIndex = 0
  if (!hasUrl) return // sin fuente, R3 ya exige lo suyo si hay hechos
  const dates = parseDates(s)
  if (!dates.length) return // sin fecha: R3 se encarga
  const newest = new Date(Math.max(...dates.map(d => d.getTime())))
  if (Date.now() - newest.getTime() > FRESH_WINDOW_MS) out.push(`fuente-mayor-72h (${newest.toISOString().slice(0, 10)})`)
}
function r8_cierre(content, out) {
  const s = String(content).trim()
  if (!s) return
  const sentences = s.split(/(?<=[.?])\s+/).filter(Boolean)
  let last = sentences[sentences.length - 1] || ''
  // la atribución de fuente final no cuenta como "cierre"
  last = last.replace(/(source|fuente)\s*:.*/i, '').replace(/https?:\/\/[^\s)>"]+/g, '').trim().replace(/[.?\s]+$/, '')
  if (!/[a-z0-9]/i.test(last)) last = (sentences[sentences.length - 2] || '').replace(/(source|fuente)\s*:.*/i, '').trim()
  if (!last) return
  const words = last.split(/\s+/).filter(Boolean)
  if (!words.length) return
  // aporta dato: cifra, año, nombre propio, o marcador factual (récord/superlativo/magnitud) — refino ronda-6
  const hasDato = /\d/.test(last) || /\b(19|20)\d{2}\b/.test(last) || /\b[A-Z][a-z]{2,}\b/.test(words.slice(1).join(' ')) || /\b(first|largest|biggest|most|record|all-time|highest|lowest)\b/i.test(last)
  if (!hasDato && words.length < 12) out.push('cierre-aforismo-sin-dato')
}
async function r4_casiDuplicado(pool, content, out) {
  if (!pool) return
  const since = new Date(Date.now() - 30 * 86400e3)
  const cand = []
  try {
    const a = await pool.query("SELECT body AS c FROM drafts WHERE ts >= $1 AND body IS NOT NULL", [since])
    cand.push(...a.rows.map(r => r.c))
    const b = await pool.query("SELECT content AS c FROM outbound_drafts WHERE ts >= $1 AND content IS NOT NULL", [since])
    cand.push(...b.rows.map(r => r.c))
  } catch { /* sin corpus → pasa */ }
  const sh = shingles(content)
  let best = 0, bestTxt = ''
  for (const c of cand) {
    if (!c || c === content) continue
    const j = jaccard(sh, shingles(c))
    if (j > best) { best = j; bestTxt = String(c).slice(0, 60) }
  }
  if (best >= DUP_THRESHOLD) out.push(`casi-duplicado (jaccard=${best.toFixed(2)} vs "${bestTxt}…")`)
}
async function r5_caps(pool, channel, type, out) {
  if (!pool) return
  if (METADATA_TYPES.includes(type)) return
  let ch = channel
  if (/facebook/i.test(type)) ch = 'facebook'
  else if (/instagram/i.test(type)) ch = 'instagram'
  const cap = caps()[ch]
  if (!cap) return
  try {
    const r = await pool.query(
      "SELECT count(*)::int AS n FROM outbound_drafts WHERE channel=$1 AND type<>ALL($2) AND status='published' AND ts >= date_trunc('day', now())",
      [ch, METADATA_TYPES])
    if (r.rows[0].n >= cap) out.push(`tope-diario:${ch}(${r.rows[0].n}/${cap})`)
  } catch { /* sin tabla → pasa (fail-open solo en caps, el resto es fail-closed) */ }
}


// R9 (ronda-14): la pieza debe compartir terminos con su fuente
function r9_atribucion(full, reasons) {
  const idx = full.indexOf('\n\n\u2014 fuente: ')
  if (idx === -1) return
  const text = full.slice(0, idx).toLowerCase()
  const words = text.split(/[^a-z0-9]+/).filter(w => w.length > 4)
  if (words.length < 5) return
  const DOMAIN = ['fee','block','channel','lightning','transaction','script','taproot','multisig','utxo','satoshi','chain','node','mining','pool','hash','signature','key','address','protocol','wallet','custody','exchange','etf','outflow','treasury','hack','exploit','phishing','security','privacy','regulation','stablecoin','nostr','zap','invoice','payment','merchant','btcpay','server','self-hosted','open-source','spot','futures','leverage','liquidation']
  const hasDomain = words.some(w => DOMAIN.includes(w) || w.includes('bitcoin') || w.includes('lightning') || w.includes('chain') || w.includes('taproot'))
  if (!hasDomain && words.length > 12) {
    reasons.push('R9-atribucion-no-verificable')
  }
}

// ── API ──────────────────────────────────────────────────────────────────────
export function ensureGuardTables(pool) {
  return pool.query(`
    CREATE TABLE IF NOT EXISTS guard_rejections (
      id bigserial PRIMARY KEY,
      ts timestamptz NOT NULL DEFAULT now(),
      channel text NOT NULL, type text NOT NULL,
      reasons text NOT NULL, content text NOT NULL
    )`)
}
export async function guardCheck(pool, { channel, type, content }) {
  const reasons = []
  const full = String(content ?? '')
  // ronda-14: separar el texto del LLM de la línea de atribución
  // la atribución ("— fuente: ... · ...") solo cuenta para R3 y R7
  // R1/R2/R8/R4/R5 se evalúan sobre el TEXTO puro
  const attrMatch = full.match(/\n\n\u2014 fuente: .+$/)
  const attribution = attrMatch ? attrMatch[0] : ''
  const body = attrMatch ? full.slice(0, attrMatch.index) : full
  r1_marcas(channel, type, body, reasons)
  if (!METADATA_TYPES.includes(type)) {
    r2_formato(body, reasons)
    r3_hechos(full, reasons)
    r7_frescura(channel, full, reasons)
    r8_cierre(body, reasons)
    r9_atribucion(full, reasons)
    await r4_casiDuplicado(pool, body, reasons)
    await r5_caps(pool, channel, type, reasons)
  }
  return { ok: reasons.length === 0, reasons }
}
export async function logRejection(pool, { channel, type, content, reasons }) {
  try {
    const r = await pool.query(
      'INSERT INTO guard_rejections (channel, type, reasons, content) VALUES ($1,$2,$3,$4) RETURNING id',
      [channel, type, reasons.join('; '), String(content).slice(0, 5000)])
    console.log(`[guard] RECHAZADO (${channel}/${type}): ${reasons.join('; ')}`)
    return r.rows[0].id
  } catch (e) { console.error('[guard] logRejection:', String(e).slice(0, 120)); return null }
}
export async function recordPublish(pool, { channel, type, content, meta = {} }) {
  try {
    const r = await pool.query(
      `INSERT INTO outbound_drafts (channel, type, content, meta, status) VALUES ($1,$2,$3,$4,'published') RETURNING id`,
      [channel, type, String(content).slice(0, 8000), JSON.stringify(meta)])
    return r.rows[0].id
  } catch (e) { console.error('[guard] recordPublish:', String(e).slice(0, 120)); return null }
}