export function extractDiscordChannelId(ctx: Record<string, unknown>, event?: Record<string, unknown>): string | undefined {
  const candidates: unknown[] = [
    ctx.conversationId,
    ctx.OriginatingTo,
    event?.to,
    (event?.metadata as Record<string, unknown>)?.to,
  ];

  for (const c of candidates) {
    if (typeof c !== "string" || !c.trim()) continue;
    const s = c.trim();

    if (s.startsWith("channel:")) {
      const id = s.slice("channel:".length);
      if (/^\d+$/.test(id)) return id;
    }

    if (s.startsWith("discord:channel:")) {
      const id = s.slice("discord:channel:".length);
      if (/^\d+$/.test(id)) return id;
    }

    if (/^\d{15,}$/.test(s)) return s;
  }

  return undefined;
}

export function extractDiscordChannelIdFromSessionKey(sessionKey?: string): string | undefined {
  if (!sessionKey) return undefined;

  const canonical = sessionKey.match(/discord:(?:channel|group):(\d+)/);
  if (canonical?.[1]) return canonical[1];

  const suffix = sessionKey.match(/:channel:(\d+)$/);
  if (suffix?.[1]) return suffix[1];

  return undefined;
}

export function extractUntrustedConversationInfo(text: string): Record<string, unknown> | undefined {
  const marker = "Conversation info (untrusted metadata):";
  const idx = text.indexOf(marker);
  if (idx < 0) return undefined;
  const tail = text.slice(idx + marker.length);
  const m = tail.match(/```json\s*([\s\S]*?)\s*```/i);
  if (!m) return undefined;

  try {
    const parsed = JSON.parse(m[1]);
    return parsed && typeof parsed === "object" ? (parsed as Record<string, unknown>) : undefined;
  } catch {
    return undefined;
  }
}

export function extractDiscordChannelIdFromConversationMetadata(conv: Record<string, unknown>): string | undefined {
  if (typeof conv.chat_id === "string" && conv.chat_id.startsWith("channel:")) {
    const id = conv.chat_id.slice("channel:".length);
    if (/^\d+$/.test(id)) return id;
  }

  if (typeof conv.conversation_label === "string") {
    const labelMatch = conv.conversation_label.match(/channel id:(\d+)/);
    if (labelMatch?.[1]) return labelMatch[1];
  }

  if (typeof conv.channel_id === "string" && /^\d+$/.test(conv.channel_id)) {
    return conv.channel_id;
  }

  return undefined;
}