import { UserRegistry } from "@registry/user-registry";
import { UsermapEntry } from "@types";
import { Config } from "@systems/config";

const IMPERSONATE_RESET_ON_POLL = Config.get("impersonateResetOnPoll");
const IMPERSONATE_INDICATOR     = Config.get("impersonateIndicator");

// realDiscordId → userKey being impersonated
const impersonations = new Map<string, string>();

export function setImpersonation(realDiscordId: string, userKey: string): void {
  impersonations.set(realDiscordId, userKey);
}

export function clearImpersonation(realDiscordId: string): void {
  impersonations.delete(realDiscordId);
}

export function getImpersonation(realDiscordId: string): string | null {
  return impersonations.get(realDiscordId) ?? null;
}

export function clearAllImpersonations(): void {
  if (IMPERSONATE_RESET_ON_POLL) impersonations.clear();
}

export function shouldShowIndicator(): boolean {
  return IMPERSONATE_INDICATOR;
}

// Returns all registered userKeys from usermap.json

export function getRegisteredUsers(): { userKey: string; aliases: string[] }[] {
  try {
    const entries = UserRegistry.all();
    const seen = new Set<string>();
    return entries.map(({ entry }: { entry: UsermapEntry }) => ({ userKey: entry.file, aliases: entry.aliases ?? [] }))
      .filter(({ userKey }) => {
        if (seen.has(userKey)) return false;
        seen.add(userKey);
        return true;
      });
  } catch {
    return [];
  }
}