Display Forez presence

lib/helpers/forez_presence_helper.dart

@@ -0,0 +1,76 @@
+import 'package:comunic/helpers/websocket_helper.dart';
+import 'package:comunic/lists/forez_presences_set.dart';
+import 'package:comunic/models/forez_presence.dart';
+
+/// Presence helper
+///
+/// @author Pierre Hubert
+
+int _cachedGroup;
+PresenceSet _cache;
+
+class ForezPresenceHelper {
+  /// Refresh presence cache
+  ///
+  /// Throws in case of failure
+  static Future<void> refreshCache(int groupID) async {
+    final response = await ws("forez_presence/list", {"group": groupID});
+
+    final list = response
+        .cast<String>()
+        .map((element) {
+          final cut = element.split(",").map((e) => int.parse(e)).toList();
+          assert(cut.length == 4);
+
+          return Presence(
+              userID: cut[0], year: cut[1], month: cut[2], day: cut[3]);
+        })
+        .toList()
+        .cast<Presence>();
+
+    _cachedGroup = groupID;
+    _cache = PresenceSet()..addAll(list);
+  }
+
+  /// Initialize cache if required
+  static Future<void> _checkCache(int groupID) async {
+    if (_cache == null || _cachedGroup != groupID) await refreshCache(groupID);
+  }
+
+  /// Get the presences of a given user
+  ///
+  /// Throws in case of failure
+  static Future<PresenceSet> getForUser(int groupID, int userID) async {
+    await _checkCache(groupID);
+
+    return _cache.getForUser(userID);
+  }
+
+  /// Get all the available presences
+  ///
+  /// Throws in case of failure
+  static Future<PresenceSet> getAll(int groupID) async {
+    await _checkCache(groupID);
+    return _cache;
+  }
+
+  /// Add a new day of presence
+  ///
+  /// Throws in case of failure
+  static Future<void> addDay(DateTime dt) async =>
+      await ws("forez_presence/add_day", {
+        "year": dt.year,
+        "month": dt.month,
+        "day": dt.day,
+      });
+
+  /// Remove a new day of presence
+  ///
+  /// Throws in case of failure
+  static Future<void> delDay(DateTime dt) async =>
+      await ws("forez_presence/del_day", {
+        "year": dt.year,
+        "month": dt.month,
+        "day": dt.day,
+      });
+}