import { loadBarter } from "@/lib/barterState";
import { loadExchange } from "@/lib/exchangeState";
import { loadForum } from "@/lib/forumState";

/** Match forum / listings when the user types the same handle (case-insensitive). */
function matchesHandle(author: string, handles: string[]): boolean {
  const a = author.trim().toLowerCase();
  if (!a) return false;
  const set = new Set(handles.map((h) => h.trim().toLowerCase()).filter(Boolean));
  return set.has(a);
}

export type UserActivityStats = {
  forumThreads: number;
  forumReplies: number;
  exchangeListings: number;
  barterListings: number;
};

export function computeUserActivityStats(username: string, displayName: string): UserActivityStats {
  const handles = [username, displayName];
  const forum = loadForum();
  let forumThreads = 0;
  let forumReplies = 0;
  for (const t of forum) {
    if (matchesHandle(t.author, handles)) forumThreads++;
    for (const r of t.replies) {
      if (matchesHandle(r.author, handles)) forumReplies++;
    }
  }
  const exchangeListings = loadExchange().filter((e) => matchesHandle(e.author, handles)).length;
  const barterListings = loadBarter().filter((b) => matchesHandle(b.author, handles)).length;
  return { forumThreads, forumReplies, exchangeListings, barterListings };
}