export type ConferenceProgress = {
  paper: boolean;
  poster: boolean;
  notification: boolean;
};

const STORAGE_KEY = "ai-deadlines-progress-v1";

const emptyProgress: ConferenceProgress = {
  paper: false,
  poster: false,
  notification: false,
};

const readAllProgress = (): Record<string, ConferenceProgress> => {
  if (typeof window === "undefined") return {};

  try {
    const raw = window.localStorage.getItem(STORAGE_KEY);
    if (!raw) return {};
    const parsed = JSON.parse(raw) as Record<string, ConferenceProgress>;
    if (!parsed || typeof parsed !== "object") return {};
    return parsed;
  } catch (error) {
    console.error("Error reading progress from localStorage:", error);
    return {};
  }
};

const writeAllProgress = (progressMap: Record<string, ConferenceProgress>) => {
  if (typeof window === "undefined") return;

  try {
    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(progressMap));
  } catch (error) {
    console.error("Error writing progress to localStorage:", error);
  }
};

export const getProgress = (confKey: string): ConferenceProgress => {
  const progressMap = readAllProgress();
  return progressMap[confKey] ?? emptyProgress;
};

export const setProgress = (confKey: string, progress: ConferenceProgress) => {
  const progressMap = readAllProgress();
  progressMap[confKey] = progress;
  writeAllProgress(progressMap);
};