Fixed problems when saving an updated formula (duplicates)

lib/ai/formula_editor.dart

@@ -15,7 +15,7 @@ import 'unit_dropdown.dart';
 class FormulaEditor extends StatefulWidget {
   final Formula formula;
   final Corpus corpus;
-  final Function(Formula)? onSave; // Callback when formula is saved
+  final Function(Formula)? onSave;
 
   const FormulaEditor({
     super.key,

lib/ai/formula_list.dart

@@ -51,15 +51,18 @@ class _FormulaListState extends State<FormulaList> {
     }).toList();
   }
 
-  String _formulaAndDependenciesToStringLiteral(Formula formula) {
-    // Get the formula and its dependencies
+  String _formulaAndDependenciesToExportStringLiteral(Formula formula) {
     final dependencies = widget.corpus.withDependencies(formula);
-    return SetUtils.prettyPrint(dependencies.map((f) => f.toMap()).toList());
+    final dependenciesAsMap = dependencies.map((f) => f.toMap()).toList();
+    for( final f in dependenciesAsMap ){
+      f.remove("uuid");
+    }
+    return SetUtils.prettyPrint(dependenciesAsMap);
   }
 
   void _shareFormula(Formula formula) async {
     try {
-      final exportString = _formulaAndDependenciesToStringLiteral(formula);
+      final exportString = _formulaAndDependenciesToExportStringLiteral(formula);
 
       // Share the string
       await share_plus.SharePlus.instance.share(
@@ -92,7 +95,7 @@ class _FormulaListState extends State<FormulaList> {
 
   void _copyFormula(Formula formula) async {
     try {
-      final exportString = _formulaAndDependenciesToStringLiteral(formula);
+      final exportString = _formulaAndDependenciesToExportStringLiteral(formula);
       
       // Copy to clipboard
       await Clipboard.setData(ClipboardData(text: exportString));
@@ -204,6 +207,11 @@ class _FormulaListState extends State<FormulaList> {
                       builder: (context) => FormulaScreen(
                         formula: formula,
                         corpus: widget.corpus,
+                        onSave: (formula){
+                          setState(() {
+                            // Refresh the list when returning from the formula screen
+                          });
+                        },
                       ),
                     ),
                   );

lib/ai/formula_screen.dart

@@ -12,10 +12,11 @@ import 'unit_dropdown.dart';
 import 'formula_editor.dart';
 
 class FormulaScreen extends StatefulWidget {
-  final Formula initialformula;
+  final Formula initialFormula;
   final Corpus corpus;
+  final Function(Formula)? onSave; // Callback when formula is saved
 
-  FormulaScreen({super.key, required formula, required this.corpus}) : initialformula = formula;
+  FormulaScreen({super.key, required formula, required this.corpus, this.onSave}) : initialFormula = formula;
 
   @override
   State<FormulaScreen> createState() => _FormulaScreenState();
@@ -55,7 +56,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
   @override
   void initState() {
     super.initState();
-    formula = widget.initialformula;
+    formula = widget.initialFormula;
   }
 
   @override
@@ -120,11 +121,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
       String? unit = formula.output.unit;
       if (unit != null && result is Number) {
         final converted = widget.corpus.convert(result, unit, _selectedOutputUnit!);
-        if (converted is num) {
-          _result = converted.toStringAsFixed(2);
-        } else {
-          _result = converted.toString();
-        }
+        _result = converted.toStringAsFixed(2);
       } else {
         _result = result?.toString();
       }
@@ -161,9 +158,8 @@ class _FormulaScreenState extends State<FormulaScreen> {
                         formula: formula,
                         corpus: widget.corpus,
                         onSave: (updatedFormula) {
-                          // Refresh the screen after saving
+                          widget.onSave?.call(updatedFormula);
                           setState(() {
-                            // The corpus has been updated, refresh the displayed formula
                             formula = updatedFormula;
                           });
                         },

lib/database/database_service.dart

@@ -46,7 +46,7 @@ extension CorpusDatabaseExtension on FormulasDatabase {
         final parsed = SetUtils.parseCorpusElements('[${element.elementText}]');
         if (parsed.isNotEmpty && parsed.first is models.Formula) {
           final existingFormula = parsed.first as models.Formula;
-          if (existingFormula.name == formula.name) {
+          if (existingFormula.uuid == formula.uuid) {
             // Update this element
             await updateFormulaElement(
               element.id, 
@@ -70,7 +70,7 @@ extension CorpusDatabaseExtension on FormulasDatabase {
   }
 
   // Method to delete a formula from the database by name
-  Future<bool> deleteFormula(String formulaName) async {
+  Future<bool> deleteFormula(String uuid) async {
     final elements = await getAllFormulaElements();
     
     for (final element in elements) {
@@ -78,7 +78,7 @@ extension CorpusDatabaseExtension on FormulasDatabase {
         final parsed = SetUtils.parseCorpusElements('[${element.elementText}]');
         if (parsed.isNotEmpty && parsed.first is models.Formula) {
           final existingFormula = parsed.first as models.Formula;
-          if (existingFormula.name == formulaName) {
+          if (existingFormula.uuid == uuid) {
             await deleteFormulaElement(element.id);
             return true;
           }

lib/formula_models.dart

@@ -311,8 +311,8 @@ class Formula extends FormulaElement {
 
   @override
   Map<String, dynamic> toMap() {
-    // UUID NOT INCLUDED ON PURPOSE
     return {
+      'uuid': uuid,
       'name': name,
       if (description != null) 'description': description,
       'input': input.map((v) => v.toMap()).toList(growable: false),
@@ -323,7 +323,7 @@ class Formula extends FormulaElement {
   }
 
   Formula({
-    String? uuid = null,
+    String? uuid,
     required this.name,
     this.description,
     required this.input,