function getProfileStats({ db, userId }) {
  if (!userId) {
    return { stats: [] };
  }
  const account = db
    .prepare("SELECT balance FROM echonomy_accounts WHERE user_id = ?")
    .get(userId);
  const earned = db
    .prepare(
      "SELECT COALESCE(SUM(amount), 0) AS total FROM echonomy_transactions " +
        "WHERE to_user_id = ? AND (from_user_id IS NULL OR from_user_id = '')"
    )
    .get(userId);
  const spent = db
    .prepare(
      "SELECT COALESCE(SUM(amount), 0) AS total FROM echonomy_transactions " +
        "WHERE from_user_id = ? AND (to_user_id IS NULL OR to_user_id = '')"
    )
    .get(userId);
  const transfersOut = db
    .prepare(
      "SELECT COALESCE(SUM(amount), 0) AS total FROM echonomy_transactions " +
        "WHERE from_user_id = ? AND to_user_id IS NOT NULL AND to_user_id != ''"
    )
    .get(userId);
  const transfersIn = db
    .prepare(
      "SELECT COALESCE(SUM(amount), 0) AS total FROM echonomy_transactions " +
        "WHERE to_user_id = ? AND from_user_id IS NOT NULL AND from_user_id != ''"
    )
    .get(userId);

  return {
    stats: [
      { label: "Balance", value: account?.balance ?? 0 },
      { label: "Total earned", value: earned?.total ?? 0 },
      { label: "Total spent", value: spent?.total ?? 0 },
      { label: "Given to others", value: transfersOut?.total ?? 0 },
      { label: "Received from others", value: transfersIn?.total ?? 0 }
    ]
  };
}

function getLeaderboards({ db, limit = 10 }) {
  const rows = db
    .prepare(
      "SELECT user_profiles.internal_username AS username, echonomy_accounts.balance AS value " +
        "FROM echonomy_accounts " +
        "JOIN user_profiles ON user_profiles.id = echonomy_accounts.user_id " +
        "ORDER BY echonomy_accounts.balance DESC LIMIT ?"
    )
    .all(limit);

  return {
    boards: [
      {
        title: "Top balances",
        valueLabel: "Balance",
        rows
      }
    ]
  };
}

module.exports = {
  getProfileStats,
  getLeaderboards
};