// memory/chat.js
const { saveMemory, getMemory, listMemory } = require('./index');

function logChatMessage(db, username, message) {
  const label = `chat:${username.toLowerCase()}`;

  getMemory(db, label, (err, existing) => {
    const history = Array.isArray(existing) ? existing : [];
    history.push({ message, timestamp: Date.now() });

    // Keep the latest 20 messages
    const trimmed = history.slice(-20);
    saveMemory(db, label, trimmed);
  });
}

function getLastMessageFrom(db, username, callback) {
  const label = `chat:${username.toLowerCase()}`;
  getMemory(db, label, (err, history) => {
    if (err || !history || history.length === 0) return callback(null, null);
    callback(null, history[history.length - 1]);
  });
}

function listKnownPlayers(db, callback) {
  listMemory(db, (err, entries) => {
    if (err) return callback(err, []);
    const players = entries
      .filter(e => e.label.startsWith('chat:'))
      .map(e => e.label.replace('chat:', ''));
    callback(null, players);
  });
}

module.exports = { logChatMessage, getLastMessageFrom, listKnownPlayers };