// ── Public: shard live data ────────────────────────────────────────────────
//
// Same-origin, token-free read endpoints backed by the data the WS ingest
// pipeline persists (shard_online / shard_events / shard_economy / shard_houses)
// plus a live character round-trip to the sidecar. The browser never sees the
// sidecar URL or token — every sidecar call is server-side (uoLinkClient).
//
// The stored-data endpoints are cheap DB reads. The live /char endpoint hits the
// running shard, so it is briefly cached and degrades gracefully: a 503 (shard
// restarting) surfaces as a retry-able banner rather than an error.

const shardEvents = require('../../../model/shardEvents/shardEvents.model')
const shardState = require('../../../model/shardState/shardState.model')
const uoLinkConfig = require('../../../model/uoLinkConfig/uoLinkConfig.model')
const broadcast = require('../../../utils/shardBroadcast')

const log = require('../../../utils/logger')('public-shard')

// GET /public/shard/status — connection state + online count + latest economy.
async function getStatus(req, res) {
  try {
    const config = await uoLinkConfig.getSafe()
    const [online, economy] = await Promise.all([
      shardState.onlineCount(),
      shardState.latestEconomy(),
    ])
    return res.json({
      enabled: config.enabled,
      status: config.status,
      pluginConnected: config.pluginConnected,
      lastEventAt: config.lastEventAt,
      onlineCount: online,
      economy,
    })
  } catch (err) {
    log.error('shard.getStatus', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /public/shard/feed?kind=&limit= — recent notable events from the log,
// restricted to the public-safe allowlist so staff audit / cheat / link events
// (which are stored for the admin channel) can never leak to the public.
async function getFeed(req, res) {
  try {
    const { kind, limit } = req.query
    let events
    if (kind) {
      // A specific kind is only served if it is itself public-safe.
      if (!broadcast.PUBLIC_KINDS.has(kind)) return res.json([])
      events = await shardEvents.list({ kind, limit })
    } else {
      events = await shardEvents.list({ kinds: [...broadcast.PUBLIC_KINDS], limit })
    }
    return res.json(events)
  } catch (err) {
    log.error('shard.getFeed', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /public/shard/economy — gold-supply series, oldest → newest.
async function getEconomy(req, res) {
  try {
    return res.json(await shardState.listEconomy(req.query.limit))
  } catch (err) {
    log.error('shard.getEconomy', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /public/shard/online — players online now whose account is linked to a
// STAFF website user (admin/editor/moderator). Shows name + location (map +
// coordinates); no vitals or account. Non-staff players are never listed.
async function getOnline(req, res) {
  try {
    const rows = await shardState.listOnlineLinked()
    return res.json(rows.map((r) => ({ serial: r.serial, name: r.name, map: r.map, x: r.x, y: r.y, z: r.z })))
  } catch (err) {
    log.error('shard.getOnline', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /public/shard/idoc — houses currently in danger (stage IDOC).
async function getIdoc(req, res) {
  try {
    return res.json(await shardState.listIdoc())
  } catch (err) {
    log.error('shard.getIdoc', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /public/shard/stream — public live-event SSE channel (safe kinds only).
function stream(req, res) {
  broadcast.subscribe(req, res, 'public')
}

module.exports = { getStatus, getFeed, getEconomy, getOnline, getIdoc, stream }