/**
 * Attendance — tracks who was in each TG.
 *
 * Usage:
 *   import { Attendance } from "@systems/attendance";
 *
 *   Attendance.snapshot(slot)
 *   Attendance.players(slot)
 *   Attendance.allSubmitted(slot, date)
 */

 import fs from "fs";
 import { Paths } from "@paths";
 import { UserKey, HistoryKey } from "@types";
 import { Store } from "@systems/store";
 
 interface AttendanceData {
   [historyKey: HistoryKey]: UserKey[];
 }
 
 let _data: AttendanceData = {};
 
 function load(): void {
  _data = Store.readOrDefault<AttendanceData>(Paths.data("attendance.json"), {});
}
function save(): void {
  Store.write(Paths.data("attendance.json"), _data);
}
 
 load();
 
 export const Attendance = {
   /**
    * Snapshot attendance from poll state at lock time.
    */
   snapshot(slot: number, lockedYesKeys: Set<UserKey>): void {
     const date       = new Date().toISOString().slice(0, 10);
     const historyKey = `${date}-${slot}` as HistoryKey;
     _data[historyKey] = [...lockedYesKeys];
     save();
   },
 
   /**
    * Get players who attended a specific TG.
    */
   players(historyKey: HistoryKey): UserKey[] {
     return _data[historyKey] ?? [];
   },
 
   /**
    * Check if a specific player attended.
    */
   includes(historyKey: HistoryKey, userKey: UserKey): boolean {
     return (_data[historyKey] ?? []).includes(userKey);
   },
 
   /**
    * Check if all attendees have submitted scores.
    */
   allSubmitted(historyKey: HistoryKey): boolean {
     const players = _data[historyKey] ?? [];
     if (players.length === 0) return false;
     try {
       const result = JSON.parse(
         fs.readFileSync(Paths.data("tg-history", `${historyKey}.json`), "utf8")
       );
       const submitted = new Set(result.scores?.map((s: any) => s.userKey) ?? []);
       return players.every((p) => submitted.has(p));
     } catch {
       return false;
     }
   },
 
   /**
    * Get all history keys (for listing past TGs).
    */
   all(): HistoryKey[] {
     return Object.keys(_data) as HistoryKey[];
   },
 };