// ── SQL for first-party clans ─────────────────────────────────────────────
//
// Three tables (see `schema.sql`): the clans a board carried, their members, and
// what this module knows about each server's board. Raw parameterised SQL, as
// everywhere in this module; the model decides what any of it means.

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

const CLANS = 'rust_clans'
const MEMBERS = 'rust_clan_members'
const BOARDS = 'rust_clan_boards'
const LINKS = 'rust_account_links'
const PLAYERS = 'rust_players'
const SERVERS = 'rust_servers'

// ── Boards ─────────────────────────────────────────────────────────────────

/** One server's board record, or null when it has never sent one. */
async function getBoard(serverId) {
  const rows = await core.query(
    `SELECT server_id AS serverId, board_t AS boardT, seen_at AS seenAt, enabled, supported,
            truncated, backend, reason, umod_clans AS umodClans, clan_count AS clanCount
       FROM ${BOARDS} WHERE server_id = ?`,
    [serverId],
  )
  return rows[0] || null
}

/** Every configured server beside its board record, which may be absent. */
async function listBoards() {
  return core.query(
    `SELECT s.id AS serverId, s.name AS serverName, s.enabled AS serverEnabled,
            b.board_t AS boardT, b.seen_at AS seenAt, b.enabled, b.supported, b.truncated,
            b.backend, b.reason, b.umod_clans AS umodClans, b.clan_count AS clanCount
       FROM ${SERVERS} s
       LEFT JOIN ${BOARDS} b ON b.server_id = s.id
      ORDER BY s.sort_order ASC, s.id ASC`,
  )
}

/**
 * Records what a board said about itself.
 *
 * `seenAt` is passed only when the board's `t` ADVANCED, and is then the
 * website's own now; otherwise the stored one is kept. That is the whole of the
 * freshness rule (see `schema.sql`), so it is done in SQL rather than trusted to
 * every caller to read-then-write.
 */
async function putBoard({ serverId, boardT, advanced, enabled, supported, truncated, backend, reason, umodClans, clanCount }) {
  await core.query(
    `INSERT INTO ${BOARDS}
       (server_id, board_t, seen_at, enabled, supported, truncated, backend, reason, umod_clans, clan_count, updated_at)
     VALUES (?, ?, ${advanced ? 'CURRENT_TIMESTAMP' : 'NULL'}, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
     ON DUPLICATE KEY UPDATE
       board_t = VALUES(board_t),
       seen_at = ${advanced ? 'CURRENT_TIMESTAMP' : 'seen_at'},
       enabled = VALUES(enabled), supported = VALUES(supported), truncated = VALUES(truncated),
       backend = VALUES(backend), reason = VALUES(reason), umod_clans = VALUES(umod_clans),
       clan_count = VALUES(clan_count), updated_at = CURRENT_TIMESTAMP`,
    [
      serverId,
      boardT,
      enabled ? 1 : 0,
      supported ? 1 : 0,
      truncated ? 1 : 0,
      backend || null,
      reason ? String(reason).slice(0, 255) : null,
      umodClans ? 1 : 0,
      clanCount || 0,
    ],
  )
}

// ── Clans ──────────────────────────────────────────────────────────────────

/** Every clan this module holds for one server, gone or not. */
async function listClansForServer(serverId) {
  return core.query(
    `SELECT external_id AS externalId, clan_id AS clanId, created_ms AS createdMs, name,
            member_count AS memberCount, gone_at AS goneAt
       FROM ${CLANS} WHERE server_id = ?`,
    [serverId],
  )
}

/**
 * Every member of one server's current clans, as the board last stated them,
 * for diffing the next board against. The name is the BOARD's, not the player
 * table's, because it is compared with the board.
 */
async function listMembersForServer(serverId) {
  return core.query(
    `SELECT m.external_id AS externalId, m.steam_id AS steamId, m.role_rank AS rank,
            m.role_name AS role, m.name
       FROM ${MEMBERS} m
       JOIN ${CLANS} c ON c.external_id = m.external_id
      WHERE c.server_id = ? AND c.gone_at IS NULL`,
    [serverId],
  )
}

async function upsertClan({ externalId, serverId, clanId, createdMs, name, color, score, memberCount, maxMembers }) {
  await core.query(
    `INSERT INTO ${CLANS}
       (external_id, server_id, clan_id, created_ms, name, color, score, member_count, max_members,
        first_seen, updated_at, gone_at)
     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, NULL)
     ON DUPLICATE KEY UPDATE
       name = VALUES(name), color = VALUES(color), score = VALUES(score),
       member_count = VALUES(member_count), max_members = VALUES(max_members),
       updated_at = CURRENT_TIMESTAMP, gone_at = NULL`,
    [externalId, serverId, clanId, createdMs, name, color, score, memberCount, maxMembers],
  )
}

/**
 * Replaces one clan's members.
 *
 * Delete then insert, not wrapped in a transaction — the same trade the presence
 * board makes (`events.db.replacePresence`): a fraction of a second in which a
 * roster read might come back short, against holding a lock on a table that core's
 * reconciler and two public routes read.
 */
async function replaceMembers(externalId, members) {
  await core.query(`DELETE FROM ${MEMBERS} WHERE external_id = ?`, [externalId])

  for (const m of members) {
    // eslint-disable-next-line no-await-in-loop
    await core.query(
      `INSERT INTO ${MEMBERS} (external_id, steam_id, name, role_rank, role_name, joined_ms)
       VALUES (?, ?, ?, ?, ?, ?)
       ON DUPLICATE KEY UPDATE name = VALUES(name), role_rank = VALUES(role_rank),
                               role_name = VALUES(role_name), joined_ms = VALUES(joined_ms)`,
      [externalId, m.steamId, m.name, m.rank, m.role, m.joinedMs],
    )
  }
}

/** Marks clans gone. Their members are removed with them; a gone clan has no roster. */
async function markGone(externalIds) {
  if (!externalIds.length) return
  const marks = externalIds.map(() => '?').join(', ')
  await core.query(
    `UPDATE ${CLANS} SET gone_at = CURRENT_TIMESTAMP WHERE external_id IN (${marks}) AND gone_at IS NULL`,
    externalIds,
  )
  await core.query(`DELETE FROM ${MEMBERS} WHERE external_id IN (${marks})`, externalIds)
}

/** One clan by its Team identity, with its server's name, or null. */
async function findClan(externalId) {
  const rows = await core.query(
    `SELECT c.external_id AS externalId, c.server_id AS serverId, s.name AS serverName,
            c.clan_id AS clanId, c.created_ms AS createdMs, c.name, c.color, c.score,
            c.member_count AS memberCount, c.max_members AS maxMembers,
            c.first_seen AS firstSeen, c.updated_at AS updatedAt, c.gone_at AS goneAt
       FROM ${CLANS} c
       JOIN ${SERVERS} s ON s.id = c.server_id
      WHERE c.external_id = ?`,
    [externalId],
  )
  return rows[0] || null
}

/**
 * The newest clan this module holds under a game id on one server, or null.
 *
 * The fallback for the one event that can arrive without a creation time
 * (`clan.member.added`, when the plugin could not read the clan back). Newest,
 * because an id that the game has re-used belongs to the clan that re-used it.
 */
async function findByGameId(serverId, clanId) {
  const rows = await core.query(
    `SELECT external_id AS externalId, name
       FROM ${CLANS} WHERE server_id = ? AND clan_id = ?
      ORDER BY created_ms DESC LIMIT 1`,
    [serverId, clanId],
  )
  return rows[0] || null
}

/** Every clan still on a board, for core's `getTeams`. */
async function listActiveClans() {
  return core.query(
    `SELECT c.external_id AS externalId, c.server_id AS serverId, s.name AS serverName,
            c.name, c.color, c.score, c.member_count AS memberCount
       FROM ${CLANS} c
       JOIN ${SERVERS} s ON s.id = c.server_id
      WHERE c.gone_at IS NULL
      ORDER BY c.server_id ASC, c.score DESC, c.name ASC`,
  )
}

/** One server's clans still on its board, for the public Clans tab. Best first. */
async function listPublicForServer(serverId) {
  return core.query(
    `SELECT external_id AS externalId, name, color, score, member_count AS memberCount,
            max_members AS maxMembers
       FROM ${CLANS}
      WHERE server_id = ? AND gone_at IS NULL
      ORDER BY score DESC, name ASC`,
    [serverId],
  )
}

/**
 * One clan's roster, with the website account behind each member when there is
 * one and whether they are on the clan's server right now.
 *
 * Three joins, all of this module's own tables: the link (a Steam id to a user),
 * the player table (the newest name the game has sent for them) and the presence
 * board. Presence is joined on the CLAN's server — a member on another server of
 * the fleet is not online here.
 */
async function listMembers(externalId) {
  return core.query(
    `SELECT m.steam_id AS steamId, COALESCE(p.name, m.name) AS name, m.role_rank AS rank,
            m.role_name AS role, m.joined_ms AS joinedMs, l.user_id AS userId,
            (pr.steam_id IS NOT NULL) AS online
       FROM ${MEMBERS} m
       JOIN ${CLANS} c ON c.external_id = m.external_id
       LEFT JOIN ${LINKS} l ON l.steam_id = m.steam_id
       LEFT JOIN ${PLAYERS} p ON p.steam_id = m.steam_id
       LEFT JOIN rust_presence pr ON pr.server_id = c.server_id AND pr.steam_id = m.steam_id
      WHERE m.external_id = ?
      ORDER BY (m.role_rank IS NULL) ASC, m.role_rank ASC, name ASC`,
    [externalId],
  )
}

/** Whether a website user holds a linked Steam account that is a member of this clan. */
async function userIsMember(externalId, userId) {
  const rows = await core.query(
    `SELECT 1 AS yes
       FROM ${MEMBERS} m
       JOIN ${LINKS} l ON l.steam_id = m.steam_id
      WHERE m.external_id = ? AND l.user_id = ?
      LIMIT 1`,
    [externalId, userId],
  )
  return rows.length > 0
}

/**
 * Recent clan events for one server, oldest first, for re-offering their feed
 * items to core until the Team they name exists (see `model/clans`).
 */
async function recentClanEvents(serverId, sinceMs) {
  return core.query(
    `SELECT id, kind, t, raw
       FROM rust_events
      WHERE server_id = ? AND kind LIKE 'clan.%' AND t >= ?
      ORDER BY t ASC, id ASC
      LIMIT 200`,
    [serverId, sinceMs],
  )
}

/**
 * Notes a player's name WITHOUT touching `last_seen`.
 *
 * `events.db.touchPlayer` also moves `last_seen`, which is right for a frame that
 * says a player was on and wrong for a clan frame: a kick is done TO somebody who
 * may be offline, and a leaderboard's "last seen" would then read as a presence
 * signal for a player who never connected (PLAN.md §23).
 *
 * A player this module has never heard of still gets a  on the new row,
 * because the column is NOT NULL; what matters is that an existing row's is left
 * alone, and every surface that reads it is behind the presence gate anyway.
 */
async function rememberName(steamId, name) {
  if (!steamId) return
  await core.query(
    `INSERT INTO ${PLAYERS} (steam_id, name, first_seen, last_seen)
     VALUES (?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
     ON DUPLICATE KEY UPDATE name = COALESCE(VALUES(name), name)`,
    [steamId, name || null],
  )
}

module.exports = {
  getBoard,
  listBoards,
  putBoard,
  listClansForServer,
  listMembersForServer,
  upsertClan,
  replaceMembers,
  markGone,
  findClan,
  findByGameId,
  listActiveClans,
  listPublicForServer,
  listMembers,
  userIsMember,
  recentClanEvents,
  rememberName,
}