/**
 * In-memory cache of sent message IDs per chat.
 * Used to identify bot's own messages for reaction filtering ("own" mode).
 */

const TTL_MS = 24 * 60 * 60 * 1000; // 24 hours

/**
 * Keep sent-message tracking shared across bundled chunks so Telegram reaction
 * filters see the same sent-message history regardless of which chunk recorded it.
 */
const TELEGRAM_SENT_MESSAGES_KEY = Symbol.for("openclaw.telegramSentMessages");

let sentMessages: Map<string, Map<string, number>> | undefined;

function getSentMessages(): Map<string, Map<string, number>> {
  if (!sentMessages) {
    const globalStore = globalThis as Record<PropertyKey, unknown>;
    sentMessages =
      (globalStore[TELEGRAM_SENT_MESSAGES_KEY] as Map<string, Map<string, number>> | undefined) ??
      new Map<string, Map<string, number>>();
    globalStore[TELEGRAM_SENT_MESSAGES_KEY] = sentMessages;
  }
  return sentMessages;
}

function cleanupExpired(scopeKey: string, entry: Map<string, number>, now: number): void {
  for (const [id, timestamp] of entry) {
    if (now - timestamp > TTL_MS) {
      entry.delete(id);
    }
  }
  if (entry.size === 0) {
    getSentMessages().delete(scopeKey);
  }
}

/**
 * Record a message ID as sent by the bot.
 */
export function recordSentMessage(chatId: number | string, messageId: number): void {
  const scopeKey = String(chatId);
  const idKey = String(messageId);
  const now = Date.now();
  const store = getSentMessages();
  let entry = store.get(scopeKey);
  if (!entry) {
    entry = new Map<string, number>();
    store.set(scopeKey, entry);
  }
  entry.set(idKey, now);
  if (entry.size > 100) {
    cleanupExpired(scopeKey, entry, now);
  }
}

/**
 * Check if a message was sent by the bot.
 */
export function wasSentByBot(chatId: number | string, messageId: number): boolean {
  const scopeKey = String(chatId);
  const idKey = String(messageId);
  const entry = getSentMessages().get(scopeKey);
  if (!entry) {
    return false;
  }
  cleanupExpired(scopeKey, entry, Date.now());
  return entry.has(idKey);
}

/**
 * Clear all cached entries (for testing).
 */
export function clearSentMessageCache(): void {
  getSentMessages().clear();
}