Initial commit — Meridian OS browser desktop demo

js/core/state.js

@@ -0,0 +1,107 @@
+/**
+ * Central state store with persistence.
+ * Keys: user, windows, wallpaper, achievements, connection
+ */
+const STORAGE_KEY = 'meridian:state';
+
+const State = (() => {
+  const listeners = new Map();
+  let _state = loadState();
+
+  function loadState() {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY);
+      if (raw) {
+        const parsed = JSON.parse(raw);
+        // achievements is stored as array, reconstruct as Set
+        if (parsed.achievements) {
+          parsed._achievementSet = new Set(parsed.achievements);
+        }
+        return parsed;
+      }
+    } catch (e) {
+      console.warn('State load failed:', e);
+    }
+    return {
+      user: null,
+      windows: [],
+      wallpaper: 'graphite',
+      achievements: [],
+      _achievementSet: new Set(),
+      connection: navigator.onLine
+    };
+  }
+
+  function saveState() {
+    try {
+      const toSave = {
+        user: _state.user,
+        windows: _state.windows,
+        wallpaper: _state.wallpaper,
+        achievements: Array.from(_state._achievementSet || _state.achievements)
+      };
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(toSave));
+    } catch (e) {
+      console.warn('State save failed:', e);
+    }
+  }
+
+  function set(key, val) {
+    _state[key] = val;
+    saveState();
+    notify(key);
+  }
+
+  function get(key) {
+    return _state[key];
+  }
+
+  function subscribe(key, cb) {
+    if (!listeners.has(key)) listeners.set(key, new Set());
+    listeners.get(key).add(cb);
+    // immediate call with current value
+    try { cb(_state[key]); } catch (e) { console.error('State subscribe error:', e); }
+    return () => off(key, cb);
+  }
+
+  function off(key, cb) {
+    const set = listeners.get(key);
+    if (set) {
+      set.delete(cb);
+      if (set.size === 0) listeners.delete(key);
+    }
+  }
+
+  function notify(key) {
+    const set = listeners.get(key);
+    if (set) {
+      for (const cb of set) {
+        try { cb(_state[key]); } catch (e) { console.error('State notify error:', e); }
+      }
+    }
+  }
+
+  function addAchievement(id) {
+    if (!_state._achievementSet) {
+      _state._achievementSet = new Set(_state.achievements || []);
+      _state.achievements = Array.from(_state._achievementSet);
+    }
+    _state._achievementSet.add(id);
+    _state.achievements = Array.from(_state._achievementSet);
+    saveState();
+    notify('achievements');
+  }
+
+  function initConnection() {
+    _state.connection = navigator.onLine;
+    window.addEventListener('online', () => { _state.connection = true; notify('connection'); saveState(); });
+    window.addEventListener('offline', () => { _state.connection = false; notify('connection'); saveState(); });
+  }
+
+  return {
+    set, get, subscribe, off, addAchievement, initConnection
+  };
+})();
+
+export default State;
+export { State };