Add timer to start_plan

lib/start_plan.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/material.dart' as material;
 import 'package:flutter/services.dart';
@@ -23,6 +25,27 @@ class _StartPlanState extends State<StartPlan> {
   final repsNode = FocusNode();
   final weightController = TextEditingController();
   final weightNode = FocusNode();
+  int current = 0;
+  int minutes = 3;
+  int seconds = 30;
+  Timer? timer;
+
+  void startTimer() {
+    setState(() {
+      current = minutes * 60 * 1000 + seconds * 1000;
+    });
+    timer = Timer.periodic(const Duration(seconds: 1), (timer) {
+      print("StartPlan: current=$current");
+      if (current == 0)
+        setState(() {
+          timer.cancel();
+        });
+      else
+        setState(() {
+          current -= 1000;
+        });
+    });
+  }
 
   Future<void> getTotals() async {
     final query = await (db.selectOnly(db.gymSets)
@@ -79,12 +102,16 @@ class _StartPlanState extends State<StartPlan> {
           ..limit(1))
         .get();
     final firstSet = sets.first;
+    setState(() {
       repsController.text = firstSet.reps.toString();
       repsController.selection = TextSelection(
         baseOffset: 0,
         extentOffset: firstSet.reps.toString().length,
       );
       weightController.text = firstSet.weight.toString();
+      minutes = firstSet.minutes;
+      seconds = firstSet.seconds;
+    });
   }
 
   @override
@@ -92,16 +119,15 @@ class _StartPlanState extends State<StartPlan> {
     super.initState();
     exercises = widget.plan.exercises.value.split(',');
     repsNode.requestFocus();
-
     getCounts();
     getTotals();
-
     focus(selectedExercise);
   }
 
   @override
   dispose() {
     super.dispose();
+    timer?.cancel();
   }
 
   @override
@@ -167,6 +193,9 @@ class _StartPlanState extends State<StartPlan> {
                   );
                 },
               ),
+              LinearProgressIndicator(
+                value: current / (minutes * 60 * 1000 + seconds * 1000),
+              ),
             ],
           ),
         ),
@@ -180,7 +209,9 @@ class _StartPlanState extends State<StartPlan> {
             );
             await db.into(db.gymSets).insert(gymSet);
             const platform = MethodChannel('com.massive/android');
-            platform.invokeMethod('timer', [180000]);
+            platform
+                .invokeMethod('timer', [minutes * 60 * 1000 + seconds * 1000]);
+            startTimer();
             await getCounts();
           },
           child: const Icon(Icons.check),