import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:glp1_companion/features/meal_planner/domain/entities/recipe_ingredient.dart';
import 'package:glp1_companion/features/recipes/data/datasources/mealie_api_client.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';

/// Phase 4B: a Mealie v1 recipe payload (ingredients, directions, nutrition)
/// must normalize into the domain [Recipe] entity — identity, media, times,
/// yield, structured ingredient maps, flattened step sections, and the
/// nutrition display strings Mealie serves (`"512 kcal"`, `"30.5 g"`).

const String _baseUrl = 'https://mealie.kellfamilyhome.com';
const String _recipeId = '6c1f2a44-9c4a-4d6e-8f6b-9a2b3c4d5e6f';
const String _slug = 'grandmas-lasagna';

/// Representative `GET /api/recipes/{slug}` detail payload.
Map<String, dynamic> _detailRecipe() => <String, dynamic>{
      'id': _recipeId,
      'slug': _slug,
      'name': "Grandma's Lasagna",
      'description': 'Slow-simmered Sunday comfort.',
      'prepTime': 'PT30M',
      'cookTime': 'PT1H30M',
      'recipeYield': '6 servings',
      'recipeIngredient': <Object?>[
        <String, Object?>{
          'quantity': 2,
          'unit': 'cup',
          'food': 'ricotta',
          'note': 'whole milk',
        },
        <String, Object?>{
          'quantity': null,
          'unit': null,
          'food': 'baking powder',
          'note': null,
        },
        '1 pinch salt',
      ],
      'recipeInstructions': <Object?>[
        <String, Object?>{
          'id': 'step-1',
          'name': 'Prep',
          'text': 'Boil the noodles until al dente.',
          'components': <Object?>[],
        },
        <String, Object?>{
          'id': 'step-2',
          'name': 'Assembly',
          'text': '',
          'components': <Object?>[],
        },
        'Bake uncovered for 45 minutes.',
      ],
      'nutrition': <String, Object?>{
        'calories': '512 kcal',
        'proteinContent': '30.5 g',
        'carbohydrateContent': '48 g',
        'fatContent': '22 g',
        'fiberContent': '6 g',
      },
    };

/// Listing summary shape of `GET /api/recipes?perPage=-1` (no detail fields).
Map<String, dynamic> _summaryRecipe() => <String, dynamic>{
      'id': _recipeId,
      'slug': _slug,
      'name': "Grandma's Lasagna",
    };

void main() {
  group('MealieApiClient.mapRecipe', () {
    test('maps identity, media, times and yield onto the domain Recipe',
        () {
      final recipe = MealieApiClient.mapRecipe(
        _detailRecipe(),
        baseUrl: '$_baseUrl/',
      );

      expect(recipe, isNotNull);
      // The Mealie UUID is reused as the local primary key so re-syncs
      // upsert the same row.
      expect(recipe!.id, _recipeId);
      expect(recipe.title, "Grandma's Lasagna");
      expect(recipe.description, 'Slow-simmered Sunday comfort.');
      expect(recipe.sourceUrl, '$_baseUrl/recipe/$_slug');
      expect(
        recipe.imageUrl,
        '$_baseUrl/api/media/recipes/$_recipeId/images/min-original.webp',
      );
      expect(recipe.prepTimeMinutes, 30);
      expect(recipe.cookTimeMinutes, 90);
      expect(recipe.servings, 6);
    });

    test('maps structured and legacy string ingredients', () {
      final recipe = MealieApiClient.mapRecipe(
        _detailRecipe(),
        baseUrl: _baseUrl,
      )!;

      expect(recipe.ingredients, hasLength(3));

      // Structured map entry: quantity/unit/food/note fields are preserved
      // exactly and the note rides after a comma in the raw text.
      final ricotta = recipe.ingredients[0];
      expect(ricotta.rawText, '2 cup ricotta, whole milk');
      expect(ricotta.quantity, 2);
      expect(ricotta.unit, 'cup');
      expect(ricotta.parsedItemName, 'ricotta, whole milk');

      // Null quantity/unit stay null (never coerced to 0 / '').
      final powder = recipe.ingredients[1];
      expect(powder.rawText, 'baking powder');
      expect(powder.quantity, isNull);
      expect(powder.unit, isNull);
      expect(powder.parsedItemName, 'baking powder');

      // Legacy plain-string entry falls through to the shared line parser.
      final salt = recipe.ingredients[2];
      expect(salt.quantity, 1);
      expect(salt.unit, 'pinch');
      expect(salt.parsedItemName, 'salt');
    });

    test('ingredients survive the repository JSON serialization round-trip',
        () {
      final recipe = MealieApiClient.mapRecipe(
        _detailRecipe(),
        baseUrl: _baseUrl,
      )!;
      final serialized =
          jsonEncode(recipe.ingredients.map((e) => e.toMap()).toList());
      final restored = (jsonDecode(serialized) as List<dynamic>)
          .map(
            (entry) => RecipeIngredient.fromMap(
              Map<String, Object?>.from(entry as Map),
            ),
          )
          .toList();

      expect(restored, hasLength(recipe.ingredients.length));
      for (var i = 0; i < restored.length; i++) {
        expect(restored[i].rawText, recipe.ingredients[i].rawText);
        expect(restored[i].parsedItemName, recipe.ingredients[i].parsedItemName);
        expect(restored[i].quantity, recipe.ingredients[i].quantity);
        expect(restored[i].unit, recipe.ingredients[i].unit);
      }
    });

    test('flattens instruction sections into ordered steps', () {
      final recipe = MealieApiClient.mapRecipe(
        _detailRecipe(),
        baseUrl: _baseUrl,
      )!;

      expect(recipe.instructions, <String>[
        'Boil the noodles until al dente.',
        // A section without text falls back to its name.
        'Assembly',
        'Bake uncovered for 45 minutes.',
      ]);
    });

    test('parses nutrition display strings into the MacroProfile', () {
      final recipe = MealieApiClient.mapRecipe(
        _detailRecipe(),
        baseUrl: _baseUrl,
      )!;

      final macros = recipe.macrosPerServing;
      expect(macros.calories, 512);
      expect(macros.proteinGrams, closeTo(30.5, 0.001));
      expect(macros.carbsGrams, closeTo(48, 0.001));
      expect(macros.fatGrams, closeTo(22, 0.001));
      expect(macros.isEmpty, isFalse);
    });

    test('generates a fallback id when Mealie omits it', () {
      final payload = <String, dynamic>{
        'slug': 'no-id-lasagna',
        'name': 'No-ID Lasagna',
        'recipeYieldQuantity': 2,
      };
      final recipe = MealieApiClient.mapRecipe(payload, baseUrl: _baseUrl)!;

      expect(
        RegExp(
          r'^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$',
        ).hasMatch(recipe.id),
        isTrue,
        reason: 'a version-4 UUID is generated locally',
      );
      expect(recipe.sourceUrl, '$_baseUrl/recipe/no-id-lasagna');
      expect(recipe.servings, 2);
      expect(recipe.ingredients, isEmpty);
      expect(recipe.instructions, isEmpty);
      expect(recipe.macrosPerServing.isEmpty, isTrue);
    });

    test('rejects payloads without a usable title', () {
      expect(
        MealieApiClient.mapRecipe(
          <String, dynamic>{'slug': 'untitled'},
          baseUrl: _baseUrl,
        ),
        isNull,
      );
      expect(
        MealieApiClient.mapRecipe(
          <String, dynamic>{'name': '   '},
          baseUrl: _baseUrl,
        ),
        isNull,
      );
    });
  });

  group('MealieApiClient.fetchAllRecipes', () {
    test(
        'lists with perPage=-1 + Bearer auth, enriches by slug, and builds '
        'the §4.9.2 media/source URLs', () async {
      final requests = <http.Request>[];
      final client = MockClient((request) async {
        requests.add(request);
        if (request.url.path == '/api/recipes' &&
            request.url.queryParameters['perPage'] == '-1') {
          return http.Response(jsonEncode([_summaryRecipe()]), 200);
        }
        if (request.url.path == '/api/recipes/$_slug') {
          return http.Response(jsonEncode(_detailRecipe()), 200);
        }
        return http.Response('not found', 404);
      });

      final recipes = await MealieApiClient(client: client)
          .fetchAllRecipes('$_baseUrl/', 'SECRET_TOKEN');

      expect(requests, hasLength(2));
      expect(
        requests.first.url.toString(),
        '$_baseUrl/api/recipes?perPage=-1',
      );
      expect(requests.first.headers['Authorization'], 'Bearer SECRET_TOKEN');
      expect(requests.last.url.path, '/api/recipes/$_slug');

      expect(recipes, hasLength(1));
      final recipe = recipes.single;
      expect(recipe.id, _recipeId);
      expect(recipe.sourceUrl, '$_baseUrl/recipe/$_slug');
      expect(
        recipe.imageUrl,
        '$_baseUrl/api/media/recipes/$_recipeId/images/min-original.webp',
      );
      // Detail fields override the bare summary.
      expect(recipe.prepTimeMinutes, 30);
      expect(recipe.ingredients, hasLength(3));
      expect(recipe.instructions, hasLength(3));
      expect(recipe.macrosPerServing.calories, 512);
    });

    test('degrades to the summary when the detail fetch fails', () async {
      final client = MockClient((request) async {
        if (request.url.queryParameters.containsKey('perPage')) {
          return http.Response(jsonEncode([_summaryRecipe()]), 200);
        }
        return http.Response('boom', 500);
      });

      final recipes = await MealieApiClient(client: client)
          .fetchAllRecipes(_baseUrl, 'token');

      expect(recipes, hasLength(1));
      final recipe = recipes.single;
      expect(recipe.title, "Grandma's Lasagna");
      expect(recipe.ingredients, isEmpty);
      expect(recipe.macrosPerServing.isEmpty, isTrue);
    });

    test('throws MealieApiException when the listing is rejected', () async {
      final client =
          MockClient((request) async => http.Response('denied', 401));

      await expectLater(
        MealieApiClient(client: client).fetchAllRecipes(_baseUrl, 'bad'),
        throwsA(isA<MealieApiException>()),
      );
    });
  });

  group('MealieApiClient.testConnection', () {
    test('returns true when /api/app/about answers 200', () async {
      late Uri probed;
      final client = MockClient((request) async {
        probed = request.url;
        return http.Response('{"version": "v1.0.0"}', 200);
      });

      final ok = await MealieApiClient(client: client)
          .testConnection(_baseUrl, 'TOKEN');

      expect(ok, isTrue);
      expect(probed.toString(), '$_baseUrl/api/app/about');
    });

    test('falls back to the recipes probe when /about is unavailable',
        () async {
      final paths = <String>[];
      final client = MockClient((request) async {
        paths.add(request.url.toString());
        if (request.url.path == '/api/app/about') {
          return http.Response('forbidden', 403);
        }
        return http.Response('[]', 200);
      });

      final ok = await MealieApiClient(client: client)
          .testConnection('$_baseUrl/', 'TOKEN');

      expect(ok, isTrue);
      expect(paths, contains('$_baseUrl/api/app/about'));
      expect(paths, contains('$_baseUrl/api/recipes?perPage=1'));
    });

    test('returns false when every probe fails or the server is unreachable',
        () async {
      final rejecting = MealieApiClient(
        client: MockClient((request) async => http.Response('nope', 401)),
      );
      expect(await rejecting.testConnection(_baseUrl, 'TOKEN'), isFalse);

      final unreachable = MealieApiClient(
        client: MockClient((request) async => throw Exception('offline')),
      );
      expect(await unreachable.testConnection(_baseUrl, 'TOKEN'), isFalse);

      // Empty inputs never hit the network.
      expect(await rejecting.testConnection('', 'TOKEN'), isFalse);
      expect(await rejecting.testConnection(_baseUrl, '   '), isFalse);
    });
  });

  group('MealieApiClient.isMealieSourceUrl', () {
    test('matches the configured instance and tolerates scheme drift', () {
      expect(
        MealieApiClient.isMealieSourceUrl(
          '$_baseUrl/recipe/$_slug',
          _baseUrl,
        ),
        isTrue,
      );
      expect(
        MealieApiClient.isMealieSourceUrl(
          '$_baseUrl/recipe/$_slug',
          '$_baseUrl/',
        ),
        isTrue,
      );
      // Same host, different scheme — previously synced rows stay badged.
      expect(
        MealieApiClient.isMealieSourceUrl(
          '$_baseUrl/recipe/$_slug',
          'http://mealie.kellfamilyhome.com',
        ),
        isTrue,
      );
      expect(
        MealieApiClient.isMealieSourceUrl(
          'https://example.com/recipe/best-lasagna',
          _baseUrl,
        ),
        isFalse,
      );
      expect(
        MealieApiClient.isMealieSourceUrl('$_baseUrl/g/home/recipe/x', _baseUrl),
        isFalse,
      );
      expect(MealieApiClient.isMealieSourceUrl('anything', ''), isFalse);
    });
  });
}