added provider for recipe wizard

lib/services/providers/recipe_provider.dart

@@ -0,0 +1,151 @@
+import 'package:flutter/material.dart';
+
+import '../../models/ingredient_list_entry.dart';
+import '../../models/recipe.dart';
+import '../../src/enums.dart';
+
+class RecipeProvider extends ChangeNotifier {
+  Recipe _recipe = Recipe(datePublished: DateTime.now());
+
+  Recipe get recipe => _recipe;
+
+  void updateTitle(String title, {bool silent = false}) {
+    _recipe = _recipe.copyWith(title: title);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateDescription(String description, {bool silent = false}) {
+    _recipe = _recipe.copyWith(description: description);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateDifficulty(Difficulty difficulty, {bool silent = false}) {
+    _recipe = _recipe.copyWith(difficulty: difficulty);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateIngredients(List<IngredientListEntry> ingredients,
+      {bool silent = false}) {
+    _recipe = _recipe.copyWith(ingredients: ingredients);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateSteps(List<String> steps, {bool silent = false}) {
+    _recipe = _recipe.copyWith(steps: steps);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateDatePublished(DateTime datePublished, {bool silent = false}) {
+    _recipe = _recipe.copyWith(datePublished: datePublished);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updatePrepTime(Duration prepTime, {bool silent = false}) {
+    _recipe = _recipe.copyWith(prepTime: prepTime);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateCookTime(Duration cookTime, {bool silent = false}) {
+    _recipe = _recipe.copyWith(cookTime: cookTime);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateTotalTime(Duration totalTime, {bool silent = false}) {
+    _recipe = _recipe.copyWith(totalTime: totalTime);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateKeywords(List<String> keywords, {bool silent = false}) {
+    _recipe = _recipe.copyWith(keywords: keywords);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateMealCategory(MealCategory mealCategory, {bool silent = false}) {
+    _recipe = _recipe.copyWith(mealCategory: mealCategory);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void updateCuisine(Cuisine cuisine, {bool silent = false}) {
+    _recipe = _recipe.copyWith(cuisine: cuisine);
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+// Helper methods for list operations
+  void addIngredient(IngredientListEntry ingredient, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      ingredients: [..._recipe.ingredients, ingredient],
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void removeIngredient(IngredientListEntry ingredient, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      ingredients: _recipe.ingredients.where((i) => i != ingredient).toList(),
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void addStep(String step, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      steps: [..._recipe.steps, step],
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void removeStep(String step, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      steps: _recipe.steps.where((s) => s != step).toList(),
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void addKeyword(String keyword, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      keywords: [..._recipe.keywords, keyword],
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+
+  void removeKeyword(String keyword, {bool silent = false}) {
+    _recipe = _recipe.copyWith(
+      keywords: _recipe.keywords.where((k) => k != keyword).toList(),
+    );
+    if (!silent) {
+      notifyListeners();
+    }
+  }
+}