import { getLoadedChannelPluginById } from "../../channels/plugins/registry-loaded.js";
import type { ChannelPlugin } from "../../channels/plugins/types.plugin.js";
import { normalizeAnyChannelId } from "../../channels/registry.js";
import {
  normalizeOptionalLowercaseString,
  normalizeOptionalString,
} from "../../shared/string-coerce.js";
import { extractSimpleExplicitGroupId } from "./group-id-simple.js";

export { extractSimpleExplicitGroupId };

export function extractExplicitGroupId(raw: string | undefined | null): string | undefined {
  const trimmed = normalizeOptionalString(raw) ?? "";
  if (!trimmed) {
    return undefined;
  }
  const simple = extractSimpleExplicitGroupId(trimmed);
  if (simple) {
    return simple;
  }
  const firstPart = trimmed.split(":").find(Boolean);
  const channelId =
    normalizeAnyChannelId(firstPart ?? "") ?? normalizeOptionalLowercaseString(firstPart);
  const messaging = channelId
    ? (getLoadedChannelPluginById(channelId) as ChannelPlugin | undefined)?.messaging
    : undefined;
  const parsed = messaging?.parseExplicitTarget?.({ raw: trimmed }) ?? null;
  if (parsed && parsed.chatType && parsed.chatType !== "direct") {
    return parsed.to.replace(/:topic:.*$/, "") || undefined;
  }
  return undefined;
}