// ── Admin · Rust — the handlers ───────────────────────────────────────────
//
// The write side of the module. Three things every handler here owes:
//
//  1. **Never return the token.** Not in a response, not in an error, not in an
//     activity-log detail. It is accepted, encrypted and forgotten.
//  2. **Record the change.** `core.activity.log` writes core's own admin audit
//     row. These handlers edit the credential that reaches a game host; "who
//     changed this" has no second place it is recorded.
//  3. **Answer rather than throw.** An unhandled rejection reaches core's error
//     handler and gets core blamed for a fault in this module.

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

const db = require('../../model/servers/servers.db')
const mapImages = require('../../mapImages')
const nextWipe = require('../../model/servers/nextWipe')
const servers = require('../../model/servers/servers.model')
const sidecar = require('../../sidecarClient')
const titleSync = require('../../titleSync')
const titles = require('../../model/titles/titles')
const titlesModel = require('../../model/titles/titles.model')
const voice = require('../../model/permissions/voice')

const log = core.logger('admin')

async function listServers(req, res) {
  try {
    const [rows, settings] = await Promise.all([servers.listForAdmin(), titlesModel.settingsByServer()])

    // Phase 17: each server's chat titles, and what the last push of them found.
    res.json({
      servers: rows.map((row) => ({
        ...row,
        titles: settings.get(row.id) || { mode: 'first', max: 2, rules: [] },
        titlePush: titleSync.lastPush(row.id),
      })),
    })
  } catch (err) {
    log.error('failed to read the server list', { error: err.message })
    res.status(500).json({ message: 'Failed to read the server list' })
  }
}

/**
 * The wipe schedule a save carries (phase 16, D130), normalised for storage — or
 * `null` when the body carries none, which leaves the stored one alone.
 *
 * Only the fields the rule reads are kept: a weekly rule's day left behind after
 * the operator switched to `forced` would be a value nothing reads and the form
 * would show back to them as if it meant something.
 */
function scheduleFrom(body) {
  if (body.wipeRule === undefined) return null
  const rule = body.wipeRule
  const weekly = rule === 'weekly' || rule === 'biweekly'
  const blank = (v) => v === undefined || v === null || v === ''
  return {
    wipeRule: rule,
    wipeDay: weekly ? Number(body.wipeDay) : null,
    wipeTime: weekly ? body.wipeTime : null,
    wipeTz: weekly ? body.wipeTz : null,
    wipeAnchor: rule === 'biweekly' ? body.wipeAnchor : null,
    wipeOnceAt: blank(body.wipeOnceAt) ? null : new Date(body.wipeOnceAt),
  }
}

async function putServer(req, res) {
  const { id } = req.params
  const { name, sidecarBaseUrl, sidecarToken, protocol, enabled, sortOrder } = req.body

  try {
    const existing = await db.getServer(id)

    // A NEW server with no token is a row that can never reach its sidecar, and
    // the operator will read the resulting "unreachable" as a network problem.
    // Refusing it up front costs one round trip and saves that hunt. An EXISTING
    // row is a different case: omitting the token is how you say "leave it".
    if (!existing && !sidecarToken) {
      return res.status(400).json({ message: 'A new server needs its sidecar token' })
    }

    // Checked whole before anything is written, so a bad schedule saves nothing
    // rather than half a row. The sentences go back as they are: the form shows
    // them beside the fields.
    const schedule = scheduleFrom(req.body)
    const problems = schedule ? nextWipe.validateSchedule(req.body) : []
    if (problems.length) return res.status(400).json({ message: problems.join(' '), errors: problems })

    await db.upsertServer({
      id,
      name,
      sidecarBaseUrl,
      // `encryptToken` returns null for an empty value, and `upsertServer` reads
      // null as "do not write this column". The two halves of that rule are in
      // different files on purpose: the model decides what a blank means, the SQL
      // decides what null does, and neither has to know the other's reason.
      sidecarTokenEnc: servers.encryptToken(sidecarToken),
      protocol: protocol === undefined ? sidecar.PROTOCOL_VERSION : protocol,
      enabled: enabled === undefined ? true : enabled,
      sortOrder: sortOrder === undefined ? 0 : sortOrder,
    })
    if (schedule) await db.setSchedule(id, schedule)

    await core.activity.log({
      req,
      action: 'rust.server.save',
      detail: {
        server: id,
        created: !existing,
        sidecarBaseUrl,
        // Whether the credential was rotated, never the credential.
        tokenChanged: Boolean(sidecarToken),
        // The schedule as written, when the save carried one. Nothing in it is a
        // secret, and "who moved the wipe" is a question players will ask.
        ...(schedule ? { schedule: { ...schedule, wipeOnceAt: schedule.wipeOnceAt ? schedule.wipeOnceAt.toISOString() : null } } : {}),
      },
    })

    return res.status(204).end()
  } catch (err) {
    log.error('failed to save a server', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to save the server' })
  }
}

async function deleteServer(req, res) {
  const { id } = req.params

  try {
    const existing = await db.getServer(id)
    if (!existing) return res.status(404).json({ message: 'No such server' })

    await db.deleteServer(id)
    await core.activity.log({ req, action: 'rust.server.delete', detail: { server: id } })

    return res.status(204).end()
  } catch (err) {
    log.error('failed to delete a server', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to delete the server' })
  }
}

/**
 * Probe one sidecar and report what came back.
 *
 * This is the route that tells a wrong URL from a wrong token from a mismatched
 * protocol, and that distinction is the whole reason it exists: all three present
 * to an operator as "the site says my server is offline", and each has a
 * different fix. The status string from `sidecarClient` is carried through
 * verbatim so the panel can say which.
 */
async function testServer(req, res) {
  const { id } = req.params

  try {
    const row = await db.getServer(id)
    if (!row) return res.status(404).json({ message: 'No such server' })

    const result = await sidecar.health(servers.withToken(row))

    await core.activity.log({
      req,
      action: 'rust.server.test',
      detail: { server: id, ok: result.ok, status: result.status },
    })

    return res.json({
      ok: result.ok,
      status: result.status,
      // `data` is the sidecar's own health document on success and the mismatch
      // detail on a 409. Both are safe to show: neither carries a credential.
      sidecar: result.data || null,
    })
  } catch (err) {
    log.error('failed to probe a sidecar', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to probe the sidecar' })
  }
}

/**
 * Fetch one server's map picture again (D110's admin button). Runs the same
 * fetch the board poll triggers, forced — the stored hash is not trusted to be
 * current — and answers what it did, because an operator pressing this is
 * asking a question: is the picture this server has the right one?
 */
async function fetchMap(req, res) {
  const { id } = req.params

  try {
    const server = await servers.getForCalling(id)
    if (!server) return res.status(404).json({ message: 'No such server, or it is disabled' })

    const result = await mapImages.run(server, null, { force: true })
    await core.activity.log({ req, action: 'rust.map.fetch', detail: { server: id, outcome: result.outcome } })

    if (result.outcome === 'busy') return res.status(409).json({ message: 'A fetch is already running for this server.' })
    return res.status(result.ok ? 200 : 502).json({ ok: result.ok, outcome: result.outcome, message: result.detail || null })
  } catch (err) {
    log.error('failed to fetch a map', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to fetch the map' })
  }
}

/**
 * Ask a server with no picture to draw one (D109). **This stalls that game**
 * for seconds — the card says how many before the button is pressed — and it is
 * refused by the plugin when a picture already exists. Answered as soon as the
 * game accepts; the picture is fetched when the render finishes.
 */
async function renderMap(req, res) {
  const { id } = req.params

  try {
    const server = await servers.getForCalling(id)
    if (!server) return res.status(404).json({ message: 'No such server, or it is disabled' })

    const actor = req.user && (req.user.username || req.user.id)
    const result = await mapImages.render(server, actor != null ? String(actor) : null)
    await core.activity.log({
      req,
      action: 'rust.map.render',
      detail: { server: id, accepted: result.ok, ...(result.ok ? {} : { reason: result.reason || null }) },
    })

    if (!result.ok) return res.status(result.status || 502).json({ message: result.message })
    return res.status(202).json({ accepted: true, stallSeconds: result.stallSeconds })
  } catch (err) {
    log.error('failed to ask for a render', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to ask the server to draw its map' })
  }
}

// ── The optional mods (phase 17) ─────────────────────────────────────────────

/**
 * Replace one server's chat titles: the rules, the mode and N (D135, D136).
 * Validated whole, so a bad rule saves nothing. The titles reach the game on
 * the push loop's next tick, and the web the next time it reads.
 */
async function putTitles(req, res) {
  const { id } = req.params

  try {
    const existing = await db.getServer(id)
    if (!existing) return res.status(404).json({ message: 'No such server' })

    const checked = titles.validateSettings(req.body)
    if (!checked.ok) return res.status(400).json({ message: checked.errors.join(' '), errors: checked.errors })

    await titlesModel.saveSettings(id, checked.value)
    await core.activity.log({
      req,
      action: 'rust.titles.save',
      detail: { server: id, mode: checked.value.mode, max: checked.value.max, rules: checked.value.rules },
    })

    return res.json({ titles: await titlesModel.settingsFor(id) })
  } catch (err) {
    log.error('failed to save chat titles', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to save the chat titles' })
  }
}

/**
 * Which optional mods one server has loaded right now, read live from the game
 * (`integrations` on `server.status`). Live, because an operator installs
 * BetterChat and then looks here, and the board the site keeps is from the last
 * time the plugin connected.
 */
async function integrations(req, res) {
  const { id } = req.params

  try {
    const server = await servers.getForCalling(id)
    if (!server) return res.status(404).json({ message: 'No such server, or it is disabled' })

    const result = await sidecar.liveStatus(server)
    const data = result.ok && result.data ? result.data : null

    return res.json({
      ok: Boolean(data),
      status: result.status,
      integrations: data && data.integrations ? data.integrations : null,
    })
  } catch (err) {
    log.error('failed to read integrations', { server: id, error: err.message })
    return res.status(500).json({ message: 'Failed to ask the server what it has loaded' })
  }
}

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

async function putVoice(req, res) {
  try {
    const result = await voice.choose(req.body.group || '', req.user ? req.user.id : null)
    if (!result.ok) return res.status(400).json({ message: result.message })

    await core.activity.log({ req, action: 'rust.voice.save', detail: { group: result.voice || null } })
    return res.json(await voice.describe())
  } catch (err) {
    log.error('failed to save the voice', { error: err.message })
    return res.status(500).json({ message: 'Failed to save the announcement voice' })
  }
}

module.exports = {
  scheduleFrom,
  listServers,
  putServer,
  deleteServer,
  testServer,
  fetchMap,
  renderMap,
  putTitles,
  integrations,
  getVoice,
  putVoice,
}