src/discord/monitor/reply-context.ts

import type { Guild, Message, User } from "@buape/carbon";
import { formatAgentEnvelope, type EnvelopeFormatOptions } from "../../auto-reply/envelope.js";
import { resolveTimestampMs } from "./format.js";
import { resolveDiscordSenderIdentity } from "./sender-identity.js";

export function resolveReplyContext(
  message: Message,
  resolveDiscordMessageText: (message: Message, options?: { includeForwarded?: boolean }) => string,
  options?: { envelope?: EnvelopeFormatOptions },
): string | null {
  const referenced = message.referencedMessage;
  if (!referenced?.author) {
    return null;
  }
  const referencedText = resolveDiscordMessageText(referenced, {
    includeForwarded: true,
  });
  if (!referencedText) {
    return null;
  }
  const sender = resolveDiscordSenderIdentity({
    author: referenced.author,
    pluralkitInfo: null,
  });
  const fromLabel = referenced.author ? buildDirectLabel(referenced.author, sender.tag) : "Unknown";
  const body = `${referencedText}\n[discord message id: ${referenced.id} channel: ${referenced.channelId} from: ${sender.tag ?? sender.label} user id:${sender.id}]`;
  return formatAgentEnvelope({
    channel: "Discord",
    from: fromLabel,
    timestamp: resolveTimestampMs(referenced.timestamp),
    body,
    envelope: options?.envelope,
  });
}

export function buildDirectLabel(author: User, tagOverride?: string) {
  const username =
    tagOverride?.trim() || resolveDiscordSenderIdentity({ author, pluralkitInfo: null }).tag;
  return `${username ?? "unknown"} user id:${author.id}`;
}

export function buildGuildLabel(params: { guild?: Guild; channelName: string; channelId: string }) {
  const { guild, channelName, channelId } = params;
  return `${guild?.name ?? "Guild"} #${channelName} channel id:${channelId}`;
}