// outbox.mjs — contención de salida a terceros (prioridad Cayce, 2026-10-31)
//
// CAYCE_PUBLISH_MODE=draft (default) → NADA sale a terceros: todo artefacto
//   (notas nostr, respuestas a menciones, posts a redes sociales, mail) se
//   guarda como BORRADOR en outbound_drafts con el hash del archivo de
//   identidad vigente. El DM al supervisor NO pasa por aquí (es interno).
// CAYCE_PUBLISH_MODE=live → comportamiento original, sin cambios.
//
// Fail-closed: en modo draft, si el guardado del borrador falla, NO se
// publica. Nunca. El error queda en el journal.
//
// Reversibilidad: una línea por servicio en su .env (CAYCE_PUBLISH_MODE=live).

import { readFileSync } from 'node:fs'
import { createHash } from 'node:crypto'
import { createRequire } from 'node:module'

const require_ = createRequire(import.meta.url)

const IDENTITY_PATH = process.env.IDENTITY_PATH || '/home/ubuntu/cayce-ops/prompts/cayce-identity.md'

export function publishMode() {
  return (process.env.CAYCE_PUBLISH_MODE || 'draft').toLowerCase()
}

let identityCache = null
export function identityFingerprint() {
  if (identityCache) return identityCache
  try {
    const raw = readFileSync(IDENTITY_PATH)
    identityCache = {
      path: IDENTITY_PATH,
      hash: createHash('sha256').update(raw).digest('hex'),
    }
  } catch (e) {
    identityCache = { path: IDENTITY_PATH, hash: null, error: String(e).slice(0, 120) }
  }
  return identityCache
}

export function loadIdentityBlock(name) {
  const raw = readFileSync(IDENTITY_PATH, 'utf8')
  const m = raw.match(
    new RegExp(`<!-- cayce-identity:block=${name} -->\\n([\\s\\S]*?)\\n<!-- /cayce-identity:block=${name} -->`)
  )
  if (!m) throw new Error(`identity block not found: ${name}`)
  return m[1]
}

export function ensureOutboxTable(poolPg) {
  return poolPg.query(`
    CREATE TABLE IF NOT EXISTS outbound_drafts (
      id bigserial PRIMARY KEY,
      ts timestamptz NOT NULL DEFAULT now(),
      channel text NOT NULL,
      type text NOT NULL,
      content text NOT NULL,
      original_event jsonb,
      identity_path text,
      identity_hash text,
      status text NOT NULL DEFAULT 'pending',
      meta jsonb
    )`).catch(e => console.error('[outbox] ensure table:', String(e).slice(0, 120)))
}

// pool auto-suficiente: si el host no pasa uno, se conecta a la BD de la
// entidad (PGURL de /srv/cayce-core/.env) para que todos los borradores
// vivan juntos en outbound_drafts
let ownPool = null
async function poolFor(poolPg) {
  if (poolPg) return poolPg
  if (!ownPool) {
    const pg = require_('/srv/cayce-core/node_modules/pg')
    const env = Object.fromEntries(
      readFileSync('/srv/cayce-core/.env', 'utf8').split('\n').filter(l => l.includes('=')).map(l => [l.slice(0, l.indexOf('=')), l.slice(l.indexOf('=') + 1)])
    )
    ownPool = new pg.Pool({ connectionString: env.PGURL })
  }
  return ownPool
}

export async function stageDraft(poolPg, { channel, type, content, original_event = null, meta = {} }) {
  poolPg = await poolFor(poolPg)
  const id = identityFingerprint()
  const r = await poolPg.query(
    `INSERT INTO outbound_drafts (channel, type, content, original_event, identity_path, identity_hash, meta)
     VALUES ($1,$2,$3,$4,$5,$6,$7) RETURNING id`,
    [channel, type, String(content), original_event ? JSON.stringify(original_event) : null,
     id.path, id.hash, JSON.stringify(meta)]
  )
  console.log(`[outbox] STAGED draft #${r.rows[0].id} (${channel}/${type}) — NO publicado (mode=${publishMode()})`)
  return { staged: true, draft_id: r.rows[0].id, mode: publishMode() }
}

// El único punto por el que debe pasar cualquier salida a terceros.
// publishFn SOLO se invoca en modo live.
export async function gateOutbound(poolPg, { channel, type, content, original_event = null, meta = {}, publishFn }) {
  if (publishMode() === 'live') {
    return { ...(await publishFn()), staged: false }
  }
  try {
    return await stageDraft(poolPg, { channel, type, content, original_event, meta })
  } catch (e) {
    // fail-closed: sin borrador guardado, no se publica
    console.error(`[outbox] FATAL: staging failed (${String(e).slice(0, 160)}) — evento DESCARTADO, no publicado`)
    return { staged: false, error: 'staging failed; discarded (fail-closed)' }
  }
}