// ── The public demo's seed: this module's rows (MODULE_API 1.18.0, DM15) ────
//
// `npm run seed:demo` hands each module its `modules.<id>` section of the
// fixture, with every `"$env:NAME"` already replaced, and the demo accounts' ids
// (DEMO_MODE.md §7.3). This module writes two kinds of row from it, through its
// own models; core never writes them:
//
//   servers  the link to the rig: the sidecar URL and token come from the host's
//            .env, so the token is never in the repo
//   links    demo-player's stand-in Steam id (DM6), so the player screens have
//            somebody to show
//   npcs     the NPC faction table and profiles of the demo default set (DM26)
//   chat     a BetterChat style per group (DM26)
//
//   { "servers": [{ "id": "main", "name": "Demo", "sidecarBaseUrl": "$env:RUST_SIDECAR_URL",
//                   "sidecarToken": "$env:RUST_SIDECAR_TOKEN" }],
//     "links":   [{ "username": "demo-player", "steamId": "7656119…", "serverId": "main" }],
//     "npcs":    { "factions": [{ "a": "bandits", "b": "guards", "relation": "allied" }],
//                  "profiles": [{ "name": "bandit", "servers": ["main"], "body": { … } }] },
//     "chat":    [{ "serverId": "main", "group": "vip", "style": { "Title": "[VIP]", … } }] }
//
// **Why NPCs and chat come from here, not the rig's baseline (DM26).** The rig is
// restored before the site is wiped, and a fresh site imports what it finds
// (§7.1). That holds for permissions, but not for these two. The restored rig's
// RunicNPC says it is already managed, by the site before this one, so the new
// site adopts nothing (D244) and its first push empties the profiles. The import
// never adopts a group's chat style. So the site holds them from the start and
// pushes them, and the placements in the baseline spawn again.
//
// A chat style names a group the rig's import has not brought in yet, because
// the seed runs first. The group is created for that server, and the import
// then adopts the rig's title, rank and permissions into it. A style lists only
// the fields that differ from BetterChat's defaults.
//
// **It runs on every seed, so it upserts.** Core seeds content on a database's
// first run only, but calls this every time. The section's shape is checked
// before anything is written, and a problem throws, which fails the seed. A
// profile is checked by the NPC model as it is saved, as the admin page saves
// one, so a profile the model refuses fails the seed too.

const linksDb = require('./model/links/links.db')
const servers = require('./model/servers/servers.model')
const serversDb = require('./model/servers/servers.db')
const npcs = require('./model/npcs/npcs.model')
const npcsDb = require('./model/npcs/npcs.db')
const npcShape = require('./model/npcs/npcProfile')
const permApply = require('./model/permissions/permissions.apply')
const permDb = require('./model/permissions/permissions.db')
const chatStyle = require('./model/permissions/chatStyle')
const sidecar = require('./sidecarClient')
const core = require('./core')

const log = core.logger('demo')

const SERVER_ID = /^[a-z0-9][a-z0-9-]{0,63}$/
const STEAM_ID = /^7656119\d{10}$/
// Oxide group names as the permission model keeps them: trimmed and lower-cased.
const GROUP_NAME = /^[a-z0-9_.-]{1,64}$/

/** BetterChat's defaults for the group, with the fixture's fields over them. */
function fullStyle(group, style) {
  return { ...chatStyle.defaults(String(group || '')), ...(style && typeof style === 'object' ? style : {}) }
}

/** Every problem with the section, as sentences. Empty when it is good to write. */
function checkSection(data, accounts = {}) {
  const problems = []
  if (!data || typeof data !== 'object' || Array.isArray(data)) return ['modules.rust must be an object']

  const list = (key) => (data[key] === undefined ? [] : data[key])
  for (const key of ['servers', 'links', 'chat']) {
    if (data[key] !== undefined && !Array.isArray(data[key])) problems.push(`modules.rust.${key} must be an array`)
  }
  const n = data.npcs
  if (n !== undefined) {
    if (!n || typeof n !== 'object' || Array.isArray(n)) problems.push('modules.rust.npcs must be an object')
    else {
      if (n.factions !== undefined && !Array.isArray(n.factions)) problems.push('modules.rust.npcs.factions must be an array')
      if (n.profiles !== undefined && !Array.isArray(n.profiles)) problems.push('modules.rust.npcs.profiles must be an array')
    }
  }
  if (problems.length) return problems

  if (n && n.factions !== undefined) {
    const checked = npcShape.checkFactions(n.factions)
    if (!checked.ok) problems.push(`modules.rust.npcs.${checked.error}`)
  }
  ;((n && n.profiles) || []).forEach((p, i) => {
    const at = `modules.rust.npcs.profiles[${i}]`
    if (!p || typeof p !== 'object') return problems.push(`${at} must be an object`)
    if (!npcShape.NAME_RULE.test(String(p.name || ''))) problems.push(`${at}.name must be 1 to 40 of a-z, 0-9, _ and -`)
    if (!p.body || typeof p.body !== 'object' || Array.isArray(p.body)) problems.push(`${at}.body must be an object`)
    return undefined
  })

  list('chat').forEach((c, i) => {
    const at = `modules.rust.chat[${i}]`
    if (!c || typeof c !== 'object') return problems.push(`${at} must be an object`)
    if (!SERVER_ID.test(String(c.serverId || ''))) problems.push(`${at}.serverId must be a server id`)
    if (!GROUP_NAME.test(String(c.group || ''))) problems.push(`${at}.group must be a group name`)
    const checked = chatStyle.validateStyle(fullStyle(c.group, c.style))
    if (!checked.ok) problems.push(`${at}.style: ${checked.errors.join(' ')}`)
    return undefined
  })

  list('servers').forEach((s, i) => {
    const at = `modules.rust.servers[${i}]`
    if (!s || typeof s !== 'object') return problems.push(`${at} must be an object`)
    if (!SERVER_ID.test(String(s.id || ''))) problems.push(`${at}.id must be lowercase letters, digits and hyphens`)
    if (typeof s.name !== 'string' || !s.name.trim()) problems.push(`${at}.name is required`)
    if (!/^https?:\/\//.test(String(s.sidecarBaseUrl || ''))) problems.push(`${at}.sidecarBaseUrl must be an http(s) URL`)
    if (typeof s.sidecarToken !== 'string' || !s.sidecarToken) problems.push(`${at}.sidecarToken is required`)
    return undefined
  })

  list('links').forEach((l, i) => {
    const at = `modules.rust.links[${i}]`
    if (!l || typeof l !== 'object') return problems.push(`${at} must be an object`)
    if (!accounts[l.username]) problems.push(`${at}.username must be one of the demo accounts`)
    if (!STEAM_ID.test(String(l.steamId || ''))) problems.push(`${at}.steamId must be a 17-digit Steam id`)
    if (l.serverId !== undefined && !SERVER_ID.test(String(l.serverId))) problems.push(`${at}.serverId must be a server id`)
    return undefined
  })

  return problems
}

/** The hook core calls: `onDemoSeed(data, { accounts })`. */
async function onDemoSeed(data, { accounts = {} } = {}) {
  const problems = checkSection(data, accounts)
  if (problems.length) throw new Error(`the Rust demo seed has problems: ${problems.join('; ')}`)

  for (const s of data.servers || []) {
    await serversDb.upsertServer({
      id: s.id,
      name: s.name.trim(),
      sidecarBaseUrl: s.sidecarBaseUrl,
      sidecarTokenEnc: servers.encryptToken(s.sidecarToken),
      protocol: s.protocol === undefined ? sidecar.PROTOCOL_VERSION : Number(s.protocol),
      enabled: s.enabled === undefined ? true : Boolean(s.enabled),
      sortOrder: s.sortOrder === undefined ? 0 : Number(s.sortOrder),
    })
    log.info('demo server ready', { server: s.id })
  }

  // A link is a plain insert by design (D23), so the upsert is spelled out here:
  // the right owner already holds it, or it is moved to them. Only the seed may
  // move a link, and only to a demo account.
  for (const l of data.links || []) {
    const userId = accounts[l.username]
    const steamId = String(l.steamId)
    const existing = await linksDb.getBySteamId(steamId)
    if (existing && Number(existing.userId) === Number(userId)) continue
    if (existing) await linksDb.removeBySteamId(steamId)
    await linksDb.insert({ steamId, userId, name: l.name || null, serverId: l.serverId || null })
    log.info('demo link ready', { username: l.username })
  }

  // After the servers: a profile is refused for a server the site does not have.
  const n = data.npcs || {}
  if (n.factions !== undefined) {
    await npcs.setFactions(n.factions)
    log.info('demo NPC factions ready', { pairs: n.factions.length })
  }
  if (n.profiles && n.profiles.length) {
    const existing = await npcsDb.listProfiles()
    for (const p of n.profiles) {
      const input = { name: p.name, body: p.body, servers: p.servers, allServers: p.allServers, killsScope: p.killsScope }
      const same = existing.find((e) => e.name === p.name && !e.replaced)
      if (same) await npcs.update(same.id, input)
      else await npcs.create(input)
      log.info('demo NPC profile ready', { profile: p.name })
    }
  }

  for (const c of data.chat || []) {
    const name = String(c.group)
    let group = await permApply.groupOn(name, c.serverId)
    if (!group) {
      const id = await permDb.insertGroup({ name, title: name })
      await permDb.setGroupServers(id, { allServers: false, servers: [c.serverId] })
      group = { id }
    }
    await permDb.setGroupChat(group.id, chatStyle.validateStyle(fullStyle(name, c.style)).fields)
    await permDb.markDirty(c.serverId)
    log.info('demo chat style ready', { server: c.serverId, group: name })
  }
}

module.exports = { checkSection, onDemoSeed }