rework timer and how we manage actions

lib/classes/activity_action.dart

@@ -14,6 +14,64 @@ class ActivityAction {
     required this.activityActionSet,
     this.media,
   });
+
+  List<List<Map<String, dynamic>>> items() {
+    List<List<Map<String, dynamic>>> sets = [];
+    Reps reps = activityActionSet.reps;
+
+    for (int i = 0; i < activityActionSet.total; i++) {
+      List<Map<String, dynamic>> actions = [];
+      int? weight = _setWeight(i);
+
+      actions.add({
+        'name': title,
+        'type': reps.type,
+        'amount': reps.amounts[i],
+        'weight': weight,
+      });
+
+      if (activityActionSet.type == 'alternating') {
+        if (reps.rest != null) {
+          actions.add({
+            'name': 'Rest',
+            'type': 'seconds',
+            'amount': reps.amounts[i],
+          });
+        }
+
+        actions.add({
+          'name': title,
+          'type': reps.type,
+          'amount': reps.amounts[i],
+          'weights': weight,
+        });
+      }
+
+      actions.add({
+        'name': 'Rest',
+        'type': 'seconds',
+        'amount': activityActionSet.rest ~/ 1000,
+      });
+
+      sets.add(actions);
+
+      // for (int j = 0; i < activityActionSet.reps.amounts; j++) {}
+    }
+
+    return sets;
+  }
+
+  int? _setWeight(setNum) {
+    Reps reps = activityActionSet.reps;
+
+    if (reps.weights.length == activityActionSet.total) {
+      return reps.weights[setNum];
+    } else if (reps.weights.length == 1) {
+      return reps.weights[0];
+    }
+
+    return null;
+  }
 }
 
 class Set {
@@ -34,14 +92,14 @@ class Reps {
   String type;
   List<int> tempo;
   List<int> amounts;
-  List<int> weights;
-  int rest;
+  List<int> weights = [];
+  int? rest;
 
   Reps({
     required this.type,
     required this.tempo,
     required this.amounts,
     required this.weights,
-    required this.rest,
+    this.rest,
   });
 }