// ── Admin · Rust · Visibility — the handlers ──────────────────────────────

const core = require('../../core')

const clans = require('../../model/clans/clans.model')
const map = require('../../model/map/map.model')
const mapDb = require('../../model/map/map.db')
const mapImages = require('../../mapImages')
const visibility = require('../../model/visibility/visibility.model')
const visibilityDb = require('../../model/visibility/visibility.db')

const log = core.logger('visibility')

/**
 * The page's whole state: both settings, and each server's clan board beside
 * the roster setting. The board is where "this server runs the uMod Clans
 * plugin, whose clans are not Teams" (D47) and "this server is at the game's
 * 100-clan ceiling" (D55) come from.
 */
async function describe() {
  const [settings, boards, mapCard] = await Promise.all([visibility.describe(), clans.boardsForAdmin(), describeMap()])
  return { ...settings, clans: { ...settings.clans, servers: boards }, map: mapCard }
}

/**
 * The Map card (phase 14, D114): the four layers' fleet defaults and each
 * server's overrides, and beside them what each server's picture is — where it
 * came from, which map it is of, when it was fetched — and what a render would
 * cost that server (D109). On this page for D106's reason: it is the one page
 * with a row per server, and a layer switch answers the same question the
 * presence switch does.
 */
async function describeMap() {
  const [servers, rows] = await Promise.all([visibilityDb.listServerPresence(), mapDb.listMeta()])
  const switches = await map.describeSwitches(servers)
  const byId = new Map(rows.map((r) => [r.serverId, r]))

  return {
    ...switches,
    servers: switches.servers.map((sw, i) => {
      const s = servers[i]
      const row = byId.get(s.id)
      return {
        ...sw,
        name: s.name,
        enabled: Boolean(s.enabled),
        picture: row
          ? {
              source: row.source,
              mapKey: row.mapKey,
              hasPicture: Boolean(row.sha256 && Number(row.byteCount) > 0),
              bytes: Number(row.byteCount) || 0,
              width: Number(row.width),
              height: Number(row.height),
              worldSize: Number(row.worldSize),
              fetchedAt: row.fetchedAt ? new Date(row.fetchedAt).toISOString() : null,
            }
          : null,
        renderStallSeconds: map.renderStallSeconds(row ? row.worldSize : null),
        ...mapImages.statusOf(s.id),
      }
    }),
  }
}

async function read(req, res) {
  try {
    res.json(await describe())
  } catch (err) {
    log.error('failed to read visibility settings', { error: err.message })
    res.status(500).json({ message: 'Failed to read the visibility settings' })
  }
}

async function update(req, res) {
  try {
    const { fleet, servers, clanRoster, news, map: mapSwitches } = req.body || {}

    // The map's switches are validated whole FIRST, before the rest is written:
    // the page saves everything with one PUT, and a refused map switch must not
    // leave the presence half already applied.
    let mapResult = null
    if (mapSwitches !== undefined) {
      mapResult = await map.update(mapSwitches, req.user, async (id) => (await visibilityDb.getServerPresence(id)) !== undefined, { dryRun: true })
      if (!mapResult.ok) {
        res.status(mapResult.status || 400).json({ message: mapResult.message })
        return
      }
    }

    const result = await visibility.update({ fleet, servers, clanRoster, news }, req.user)
    if (!result.ok) {
      res.status(result.status || 400).json({ message: result.message })
      return
    }

    if (mapSwitches !== undefined) {
      mapResult = await map.update(mapSwitches, req.user, async (id) => (await visibilityDb.getServerPresence(id)) !== undefined)
      if (mapResult.ok && Object.keys(mapResult.changed).length) result.changed.map = mapResult.changed
    }

    // One row per save, naming everything it changed. Widening who may see the
    // roll call is exactly the kind of change somebody later needs to trace to a
    // person and a time.
    await core.activity.log({ req, action: 'rust.visibility.save', detail: result.changed })

    res.json(await describe())
  } catch (err) {
    log.error('failed to save visibility settings', { error: err.message })
    res.status(500).json({ message: 'Failed to save the visibility settings' })
  }
}

module.exports = { read, update }