// uo-link sidecar connection config store. Mirrors botConfig/emailConfig: the DB
// layer only ever sees ciphertext, and only getWithToken() (used server-side to
// call the sidecar over REST/WS) decrypts it. The admin-facing getSafe() never
// includes the token — it exposes only `hasToken`. A blank `token` on save means
// "leave the existing token unchanged" (same convention as the other configs).

const db = require('./uoLinkConfig.db')
const { secretBox } = require('../../core')

// The wire protocol this build speaks (link/sidecar/src/main.rs PROTOCOL_VERSION).
// Only used before an admin has saved anything — the stored row wins once it exists,
// and UOLINK_PROTOCOL still overrides for an operator running an older sidecar.
//
// This says 7 because this build speaks protocol 7: the idempotency key and the
// participation ledger (6), and the world verbs plus the targeted lease planes (7).
//
// It said 4 before 5, and 3 for a while after protocol 4 shipped — which is the bug this
// constant was introduced to fix. A FRESH install pinned 3, the sidecar answered
// `409 protocol version mismatch` to every REST call, and a new deployment read nothing
// from its shard until an admin edited the number by hand in Admin → Shard.
//
// **And it happened again, twice, in Phases 11a and 12a** — this constant and the two in
// `db/schema.sql` all sat at 5 while the wire went to 6 and then 7, so every sidecar call
// on a real deployment would have been refused. Both live walks set the column by hand
// while standing the rig up, which is exactly what makes a migration nobody runs
// invisible. Phase 12b carries all three to 7.
//
// **Nothing in this repo can check this against the wire**, and that is worth knowing
// before trusting the test that guards it: `schemaFragment.test.js` asserts the three
// declarations agree WITH EACH OTHER, which is a real check — they drifted apart once —
// but all three being equally stale passes it. The wire's version lives in `link`
// (`PROTOCOL_VERSION`) and the overlay's in `servuo-plugins/overlay.toml`; the thing that
// actually pairs them is the installer's bundle check, at deploy time. So bumping this in
// the same change as the emitters is still the discipline, and no test here replaces it.
const DEFAULT_PROTOCOL = Number(process.env.UOLINK_PROTOCOL) || 7

function toSafe(row) {
  if (!row) {
    return {
      baseUrl: process.env.UOLINK_BASE_URL || null,
      wsUrl: process.env.UOLINK_WS_URL || null,
      protocol: DEFAULT_PROTOCOL,
      enabled: false,
      hasToken: false,
      status: 'disconnected',
      statusDetail: null,
      pluginConnected: false,
      lastEventAt: null,
      bootId: null,
    }
  }
  return {
    baseUrl: row.base_url || null,
    wsUrl: row.ws_url || null,
    protocol: row.protocol || DEFAULT_PROTOCOL,
    enabled: Boolean(row.enabled),
    hasToken: Boolean(row.auth_token_enc),
    status: row.status || 'disconnected',
    statusDetail: row.status_detail || null,
    pluginConnected: Boolean(row.plugin_connected),
    lastEventAt: row.last_event_at || null,
    bootId: row.boot_id || null,
  }
}

async function getSafe() {
  return toSafe(await db.get())
}

// Decrypted token included — server-side only (calling the sidecar's REST/WS
// API). Returns null when nothing has been saved yet.
async function getWithToken() {
  const row = await db.get()
  if (!row) return null
  return { ...toSafe(row), token: row.auth_token_enc ? secretBox.decrypt(row.auth_token_enc) : null }
}

// Save admin-supplied config. `token` undefined or '' means "leave the existing
// token unchanged" (same convention as botConfig.save).
async function save({ baseUrl, wsUrl, token, protocol, enabled, updatedBy }) {
  const fields = {}
  if (baseUrl !== undefined) fields.base_url = baseUrl
  if (wsUrl !== undefined) fields.ws_url = wsUrl
  if (token) fields.auth_token_enc = secretBox.encrypt(token)
  if (protocol !== undefined) fields.protocol = protocol
  if (enabled !== undefined) fields.enabled = enabled ? 1 : 0
  if (updatedBy !== undefined) fields.updated_by = updatedBy
  const row = await db.upsert(fields)
  return toSafe(row)
}

// Mirror the sidecar's last-reported connection state into the DB so the admin
// panel has something to show between polls and the public status endpoint can
// read it without a live round-trip.
async function recordStatus({ status, statusDetail, pluginConnected, lastEventAt, bootId }) {
  const fields = {}
  if (status !== undefined) fields.status = status
  if (statusDetail !== undefined) fields.status_detail = statusDetail
  if (pluginConnected !== undefined) fields.plugin_connected = pluginConnected ? 1 : 0
  // lastEventAt may arrive as an ISO string (e.g. "2026-07-10T22:08:27Z"); the
  // mariadb DATETIME parser rejects the "T"/"Z", so hand it a real Date (same
  // fix as botConfig.recordStatus's last_connected_at).
  if (lastEventAt !== undefined) fields.last_event_at = lastEventAt ? new Date(lastEventAt) : null
  if (bootId !== undefined) fields.boot_id = bootId
  if (Object.keys(fields).length === 0) return getSafe()
  const row = await db.upsert(fields)
  return toSafe(row)
}

// DEFAULT_PROTOCOL is exported for the schema test, which asserts that this constant
// and schema.sql's two declarations of the same number AGREE, rather than asserting a
// hardcoded version at each site -- which is what let them drift apart before.
module.exports = { getSafe, getWithToken, save, recordStatus, DEFAULT_PROTOCOL }