// SQL behind the Team provider — three questions core asks, answered from the
// guild board and the roster Protocol 4 put there.
//
// Every statement reads only THIS module's tables. Core's Team tables are
// core-internal (docs/website/TEAMS.md §10.3) and this module must never name
// one, even though it is what fills them.

// `query` is destructured from the core facade at require time, like every other
// *.db.js here. The facade resolves `ctx` per call, so taking it now is safe even
// though `ctx` does not exist yet when this file is first required.
const { query } = require('../../core')

/**
 * The guild board — one row per guild the shard has told us about.
 *
 * `members`/`online` here are the COUNTS `guild.update` carries; the roster is a
 * separate table (Protocol 4). Both are read, because a count is what the shard
 * asserts and a roster is what it enumerated, and they can legitimately disagree
 * for the moment between a membership change and the sweep that reports it.
 */
const listGuilds = () =>
  query(
    `SELECT id, name, abbr, alliance, members, online, leader_serial, leader_name, leader_acct
     FROM shard_guilds ORDER BY name ASC`,
  )

const findGuild = (id) =>
  query(
    `SELECT id, name, abbr, alliance, members, online, leader_serial, leader_name, leader_acct
     FROM shard_guilds WHERE id = ? LIMIT 1`,
    [id],
  )

/**
 * One guild's roster, with the site link and live presence folded in.
 *
 * Two LEFT JOINs, both deliberate:
 *
 *   - `shard_account_links` resolves `user_id` HERE rather than in core, because
 *     this module owns that table and a core that read it would be core naming a
 *     module's table by name (§2.3). It is also why a freshly linked account
 *     appears as linked on the next reconcile rather than needing core to know
 *     anything about linking.
 *   - `shard_online` is how a member's `online` is answered at all. The roster
 *     frame does not carry it — the wire's member is the standard actor object
 *     (`serial`, `name`, `player`, `acct?`, `webId?`), and the board's `online` is
 *     a count, not a set. Presence therefore comes from the online table, which
 *     is the same source the public "who's online" surface already uses.
 *
 * `web_id` on the roster row is preferred over the link table when present: it is
 * what the shard itself asserted at roster time, and the join is the fallback for
 * a member whose row predates their link.
 */
const listGuildMembers = (guildId) =>
  query(
    `SELECT m.serial, m.name, m.acct, m.web_id, m.is_player,
            l.user_id AS linked_user_id,
            (o.serial IS NOT NULL) AS is_online
     FROM shard_guild_members m
     LEFT JOIN shard_account_links l ON l.account = m.acct
     LEFT JOIN shard_online o ON o.serial = m.serial
     WHERE m.guild_id = ?
     ORDER BY m.name ASC`,
    [guildId],
  )

module.exports = { listGuilds, findGuild, listGuildMembers }