created different models

lib/constants/cooking_units.dart

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+import 'package:flutter/material.dart';
+
+import '../models/unit.dart' show Unit;
+import '../src/enums.dart';
+
+abstract class CookingUnits {
+  // Fluid volume units
+  static Unit get teaspoon => Unit(
+        'teaspoon',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get tablespoon => Unit(
+        'tablespoon',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get fluidOunce => Unit(
+        'fluid ounce',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get cup => Unit(
+        'cup',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get pint => Unit(
+        'pint',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get quart => Unit(
+        'quart',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get gallon => Unit(
+        'gallon',
+        UnitType.fluid,
+        system: System.imperial,
+      );
+
+  static Unit get milliliter => Unit(
+        'milliliter',
+        UnitType.fluid,
+      );
+
+  static Unit get liter => Unit(
+        'liter',
+        UnitType.fluid,
+      );
+
+  // Weight units
+  static Unit get ounce => Unit(
+        'ounce',
+        UnitType.weight,
+        system: System.imperial,
+      );
+
+  static Unit get pound => Unit(
+        'pound',
+        UnitType.weight,
+        system: System.imperial,
+      );
+
+  static Unit get gram => Unit(
+        'gram',
+        UnitType.weight,
+      );
+
+  static Unit get kilogram => Unit(
+        'kilogram',
+        UnitType.weight,
+      );
+
+  // Count units
+  static Unit get piece => Unit(
+        'piece',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get dozen => Unit(
+        'dozen',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  // Informal units
+  static Unit get pinch => Unit(
+        'pinch',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get dash => Unit(
+        'dash',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get drop => Unit(
+        'drop',
+        UnitType.fluid,
+        system: System.neutral,
+      );
+
+  static Unit get stick => Unit(
+        'stick',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get can => Unit(
+        'can',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get batch => Unit(
+        'batch',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  static Unit get handful => Unit(
+        'handful',
+        UnitType.count,
+        system: System.neutral,
+      );
+
+  /// returns english abbreviation if available, else empty String
+  static String getUnitAbbreviation(BuildContext context, Unit unit) {
+    final abbreviations = {
+      'teaspoon': 'tsp',
+      'tablespoon': 'tbsp',
+      'fluid ounce': 'fl oz',
+      'cup': 'c',
+      'pint': 'pt',
+      'quart': 'qt',
+      'gallon': 'gal',
+      'milliliter': 'ml',
+      'liter': 'l',
+      'ounce': 'oz',
+      'pound': 'lb',
+      'gram': 'g',
+      'kilogram': 'kg',
+    };
+    return abbreviations[unit.name] ?? '';
+  }
+}

lib/models/ingredient.dart

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+import '../src/enums.dart' show IngredientType;
+import 'unit.dart';
+
+class Ingredient {
+  final String title;
+  final List<Unit> possibleUnits;
+  final List<String> preferredBrands;
+  final IngredientType type;
+
+  Ingredient({
+    required this.title,
+    required this.type,
+    this.possibleUnits = const [],
+    this.preferredBrands = const [],
+  });
+}

lib/models/ingredient_list_entry.dart

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+import 'ingredient.dart';
+import 'unit.dart';
+
+class IngredientListEntry {
+  final Ingredient ingredient;
+  final int amount;
+  final Unit unit;
+  final bool optional;
+
+  IngredientListEntry(this.ingredient, this.amount, this.unit, this.optional);
+}

lib/models/recipe.dart

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+import '../src/enums.dart' show Difficulty, Cuisine, MealCategory;
+import 'ingredient_list_entry.dart';
+
+class Recipe {
+  final int id;
+  final String title;
+  final String description;
+  final Difficulty difficulty;
+  final List<IngredientListEntry> ingredients = [];
+  final List<String> steps = [];
+  final DateTime datePublished;
+  final Duration prepTime;
+  final Duration cookTime;
+  final Duration totalTime;
+  final List<String> keywords = [];
+  final MealCategory mealCategory;
+  final Cuisine cuisine;
+
+  Recipe({
+    required this.id,
+    required this.title,
+    required this.description,
+    required this.difficulty,
+    required this.datePublished,
+    required this.prepTime,
+    required this.cookTime,
+    required this.totalTime,
+    required this.mealCategory,
+    required this.cuisine,
+  });
+}

lib/models/unit.dart

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+import '../src/enums.dart' show UnitType, System;
+
+class Unit {
+  final String name;
+  final UnitType type;
+  final System system;
+
+  Unit(this.name, this.type, {this.system = System.metric});
+}

lib/src/enums.dart

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+enum System { metric, imperial, neutral }
+
+enum UnitType {
+  fluid,
+  weight,
+  count,
+}
+
+enum Difficulty {
+  notSelected,
+  veryEasy,
+  easy,
+  intermediate,
+  hard,
+  veryHard,
+}
+
+enum IngredientType {
+  vegetable,
+  meat,
+  fish,
+  grain,
+  fruit,
+  dairy,
+  fatsAndOil,
+  spice,
+  other,
+}
+
+enum MealCategory {
+  // Main Meals
+  breakfast,
+  brunch,
+  lunch,
+  dinner,
+  supper,
+
+  // Other Categories
+  dessert,
+  snack,
+  appetizer,
+  sideDish,
+  beverage
+}
+
+enum Cuisine {
+  // Asian Cuisines
+  chinese,
+  japanese,
+  korean,
+  vietnamese,
+  thai,
+  indian,
+  indonesian,
+  malaysian,
+  filipino,
+  singaporean,
+
+  // European Cuisines
+  french,
+  italian,
+  spanish,
+  greek,
+  german,
+  british,
+  irish,
+  polish,
+  hungarian,
+  swedish,
+  norwegian,
+  danish,
+  portuguese,
+  belgian,
+  dutch,
+  swiss,
+
+  // Middle Eastern Cuisines
+  turkish,
+  lebanese,
+  persian,
+  israeli,
+  moroccan,
+  egyptian,
+
+  // American Cuisines
+  american,
+  mexican,
+  brazilian,
+  argentinian,
+  peruvian,
+  caribbean,
+  cajun,
+  creole,
+  texMex,
+  canadian,
+
+  // African Cuisines
+  ethiopian,
+  nigerian,
+  southAfrican,
+  kenyan,
+  tunisian,
+
+  // Pacific & Oceanian
+  australian,
+  newZealand,
+  hawaiian,
+  polynesian,
+
+  // Regional American
+  southernUs,
+  newEngland,
+  midwestern,
+  southwestern,
+  california,
+
+  // Fusion
+  asianFusion,
+  latinFusion,
+  mediterranean,
+  panAsian,
+
+  // Other
+  international,
+  modern,
+  fusion,
+  streetFood
+}