food-ai/client/lib/shared/models/recipe.dart

import 'package:json_annotation/json_annotation.dart';

part 'recipe.g.dart';

@JsonSerializable(explicitToJson: true)
class Recipe {
  final String title;
  final String description;
  final String cuisine;
  final String difficulty;

  @JsonKey(name: 'prep_time_min')
  final int prepTimeMin;

  @JsonKey(name: 'cook_time_min')
  final int cookTimeMin;

  final int servings;

  @JsonKey(name: 'image_url', defaultValue: '')
  final String imageUrl;

  @JsonKey(name: 'image_query', defaultValue: '')
  final String imageQuery;

  @JsonKey(defaultValue: [])
  final List<RecipeIngredient> ingredients;

  @JsonKey(defaultValue: [])
  final List<RecipeStep> steps;

  @JsonKey(defaultValue: [])
  final List<String> tags;

  @JsonKey(name: 'nutrition_per_serving')
  final NutritionInfo? nutrition;

  const Recipe({
    required this.title,
    required this.description,
    required this.cuisine,
    required this.difficulty,
    required this.prepTimeMin,
    required this.cookTimeMin,
    required this.servings,
    this.imageUrl = '',
    this.imageQuery = '',
    this.ingredients = const [],
    this.steps = const [],
    this.tags = const [],
    this.nutrition,
  });

  factory Recipe.fromJson(Map<String, dynamic> json) => _$RecipeFromJson(json);
  Map<String, dynamic> toJson() => _$RecipeToJson(this);
}

@JsonSerializable()
class RecipeIngredient {
  final String name;
  final double amount;

  /// Unit from Gemini recommendations (free-form string).
  @JsonKey(defaultValue: '')
  final String unit;

  /// Unit code from the DB-backed saved recipes endpoint.
  @JsonKey(name: 'unit_code')
  final String? unitCode;

  const RecipeIngredient({
    required this.name,
    required this.amount,
    this.unit = '',
    this.unitCode,
  });

  /// Returns the best available unit identifier for display / lookup.
  String get effectiveUnit => unitCode ?? unit;

  factory RecipeIngredient.fromJson(Map<String, dynamic> json) =>
      _$RecipeIngredientFromJson(json);
  Map<String, dynamic> toJson() => _$RecipeIngredientToJson(this);
}

@JsonSerializable()
class RecipeStep {
  final int number;
  final String description;

  @JsonKey(name: 'timer_seconds')
  final int? timerSeconds;

  const RecipeStep({
    required this.number,
    required this.description,
    this.timerSeconds,
  });

  factory RecipeStep.fromJson(Map<String, dynamic> json) =>
      _$RecipeStepFromJson(json);
  Map<String, dynamic> toJson() => _$RecipeStepToJson(this);
}

@JsonSerializable()
class NutritionInfo {
  final double calories;

  @JsonKey(name: 'protein_g')
  final double proteinG;

  @JsonKey(name: 'fat_g')
  final double fatG;

  @JsonKey(name: 'carbs_g')
  final double carbsG;

  @JsonKey(defaultValue: true)
  final bool approximate;

  const NutritionInfo({
    required this.calories,
    required this.proteinG,
    required this.fatG,
    required this.carbsG,
    this.approximate = true,
  });

  factory NutritionInfo.fromJson(Map<String, dynamic> json) =>
      _$NutritionInfoFromJson(json);
  Map<String, dynamic> toJson() => _$NutritionInfoToJson(this);
}