function getProfileStats({ db, userId }) {
  if (!userId) {
    return { stats: [] };
  }
  const row = db
    .prepare(
      "SELECT COUNT(*) AS total FROM quotes WHERE quoter_user_id = ? AND hidden = 0 AND archived = 0"
    )
    .get(userId);
  return {
    stats: [
      {
        label: "Quotes made",
        value: row?.total || 0
      }
    ]
  };
}

function getLeaderboards({ db, limit }) {
  const totalQuotes = getQuoteTotals(db);
  const topQuoters = getQuoteLeaders(db, limit);
  const topGames = getQuoteGameLeaders(db, limit);
  return {
    boards: [
      {
        id: "total",
        title: "Total quotes",
        description: "Total quotes recorded.",
        rowType: "text",
        valueLabel: "Quotes",
        rows: totalQuotes > 0 ? [{ label: "All quotes", value: totalQuotes }] : [],
        emptyMessage: "No quotes recorded yet.",
        topId: "quotes",
        topAliases: ["quote", "totalquotes"]
      },
      {
        id: "quoters",
        title: "Top quoters",
        description: "Users who created the most quotes.",
        rowType: "user",
        valueLabel: "Quotes",
        rows: topQuoters,
        emptyMessage: "No quotes recorded yet.",
        topId: "quoter",
        topAliases: ["quoters", "quotesmade"]
      },
      {
        id: "games",
        title: "Top quoted games",
        description: "Games mentioned most in quotes.",
        rowType: "game",
        valueLabel: "Quotes",
        rows: topGames,
        emptyMessage: "No quoted games recorded yet.",
        topId: "games",
        topAliases: ["game", "quotegames"],
        topOverride: true
      }
    ]
  };
}

function getQuoteTotals(db) {
  const row = db
    .prepare(
      "SELECT COUNT(*) AS total FROM quotes WHERE hidden = 0 AND archived = 0"
    )
    .get();
  return row?.total || 0;
}

function getQuoteLeaders(db, limit = 10) {
  if (!hasColumn(db, "quotes", "quoter_user_id")) {
    return [];
  }
  return db
    .prepare(
      "SELECT user_profiles.internal_username AS username, COUNT(*) AS value " +
        "FROM quotes " +
        "JOIN user_profiles ON user_profiles.id = quotes.quoter_user_id " +
        "WHERE quotes.hidden = 0 AND quotes.archived = 0 " +
        "GROUP BY quotes.quoter_user_id " +
        "ORDER BY value DESC LIMIT ?"
    )
    .all(limit);
}

function getQuoteGameLeaders(db, limit = 10) {
  return db
    .prepare(
      "SELECT game_name AS label, COUNT(*) AS value " +
        "FROM quotes " +
        "WHERE hidden = 0 AND archived = 0 AND game_name IS NOT NULL AND game_name != '' " +
        "GROUP BY game_name " +
        "ORDER BY value DESC LIMIT ?"
    )
    .all(limit);
}

function hasColumn(db, table, column) {
  try {
    const columns = db
      .prepare(`PRAGMA table_info(${table})`)
      .all()
      .map((entry) => entry.name);
    return columns.includes(column);
  } catch {
    return false;
  }
}

module.exports = {
  getProfileStats,
  getLeaderboards,
  getQuoteTotals,
  getQuoteLeaders,
  getQuoteGameLeaders
};