import 'package:d4rt_formulas/corpus.dart';
import 'package:d4rt_formulas/defaults/default_corpus.dart';
import 'package:d4rt_formulas/formula_evaluator.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:d4rt_formulas/formula_models.dart';


void main() {

  TestWidgetsFlutterBinding.ensureInitialized();

  Future<Corpus> createTestCorpus() async {
    return createDefaultCorpus();
  }

  Future<Corpus> testCorpus = createTestCorpus();


  test("Parses unit", () {
    final setLiteral = {"name": "kilometer", "symbol": "km", "baseUnit": "meter", "factor": 1000};
    final unit = UnitSpec.fromSet(setLiteral);
    expect(unit.name, "kilometer");
    expect(unit.symbol, "km");
    expect(unit.baseUnit, "meter");
    expect(unit.factorFromUnitToBase, 1000);
    expect(unit.codeFromUnitToBase, null);
    expect(unit.codeFromBaseToUnit, null);
  });

  test("From km to in", () async {
    final corpus = await testCorpus;
    final inches = corpus.convert(1, "kilometer", "inch");
    expect( inches, closeTo(39370.078,0.001) );
  });

  test("From furlong to base", () async {
    final corpus = await testCorpus;
    final m = corpus.convert(1, "furlong", "meter");
    expect(m,closeTo(201.168,0.001));
  });

  test("From base to furlong", () async {
    final corpus = await testCorpus;
    final m = corpus.convert(201.168, "meter", "furlong");
    expect(m,closeTo(1,0.001));
  });

  test("From C to F", () async {
    final corpus = await testCorpus;
    final m = corpus.convert(37, "Celsius", "Fahrenheit");
    expect(m,closeTo(98.6,0.001));
  });

  test("From K to F", () async {
    final corpus = await testCorpus;
    final m = corpus.convert(37, "Kelvin", "Fahrenheit");
    expect(m,closeTo(-393.07,0.001));
  });

  test("From C to K", () async {
    final corpus = await testCorpus;
    final m = corpus.convert(100, "Celsius", "Kelvin");
    expect(m,closeTo(373.15,0.001));
  });

  test('Parses Newton\'s second law formula from set literal', () {
    final setLiteral = {
      "name": "Newton's second law",
      "input": [
        {"name": 'm', "unit": 'kilogram'},
        {"name": 'a', "unit": 'meters per square second'},
      ],
      "output": {"name": 'F', "unit": 'newton'},
      "d4rtCode": '''
              F = a * m;
          ''',
    };

    final formula = Formula.fromSet(setLiteral);
    final evaluator = FormulaEvaluator();

    final result = evaluator.evaluate(formula, {
      'm': 10.0, // 10 kg
      'a': 9.8, // 9.8 m/s²
    });

    expect(result, 98.0); // F = m * a = 10 * 9.8 = 98 N
  });

  test('d4rt parses formula from literal', () {
    final literal = """
    {
      "name": "Newton's second law",
      "input": [
        { "name": 'm', "unit": 'kilogram'},
        { "name": 'a', "unit": 'meters per square second'}
      ],
      "output": { "name": 'F', "unit": 'newton'},
      "d4rtCode": '''
              F = a * m;
          '''
    }    
    """;

    final formula = Formula.fromStringLiteral(literal);
    final evaluator = FormulaEvaluator();

    final result = evaluator.evaluate(formula, {
      'm': 10.0, // 10 kg
      'a': 9.8, // 9.8 m/s²
    });

    expect(result, 98.0); // F = m * a = 10 * 9.8 = 98 N
  });

  group('APGAR Score', () {
    test('evaluates APGAR score formula - Normal case', () async {
      final corpus = await testCorpus;
      final formula = corpus.getFormula("Apgar Score")!;
      final evaluator = FormulaEvaluator();

      final result = evaluator.evaluate(formula, {
        'HeartRate': '> 100 bpm',
        'Breathing': 'Strong, robust cry',
        'MuscleTone': 'Flexed arms/leg, resists extension',
        'Reflexes': 'Cry on stimulation',
        'SkinColor': 'Pink'
      });

      expect(result, 'Score: 10 - Normal');
    });

    test('evaluates APGAR score formula - Good condition case', () async {
      final corpus = await testCorpus;
      final formula = corpus.getFormula("Apgar Score")!;
      final evaluator = FormulaEvaluator();

      final result = evaluator.evaluate(formula, {
        'HeartRate': '> 100 bpm',  // 2
        'Breathing': 'Strong, robust cry',  // 2
        'MuscleTone': 'Some',  // 1
        'Reflexes': 'Grimace on aggressive stimulation',  // 1
        'SkinColor': 'Blue extremities, pink body'  // 1
      });

      expect(result, 'Score: 7 - Normal');
    });

    test('evaluates APGAR score formula - Needs assistance case', () async {
      final corpus = await testCorpus;
      final formula = corpus.getFormula("Apgar Score")!;
      final evaluator = FormulaEvaluator();

      final result = evaluator.evaluate(formula, {
        'HeartRate': '> 100 bpm',  // 2
        'Breathing': 'Weak, irregular',  // 1
        'MuscleTone': 'Some',  // 1
        'Reflexes': 'Grimace on aggressive stimulation',  // 1
        'SkinColor': 'Blue extremities, pink body'  // 1
      });

      expect(result, 'Score: 6 - Needs assistance');
    });

    test('evaluates APGAR score formula - Critical condition case', () async {
      final corpus = await testCorpus;
      final formula = corpus.getFormula("Apgar Score")!;
      final evaluator = FormulaEvaluator();

      final result = evaluator.evaluate(formula, {
        'HeartRate': 'Absent',  // 0
        'Breathing': 'Absent',  // 0
        'MuscleTone': 'None',  // 0
        'Reflexes': 'No response',  // 0
        'SkinColor': 'Blue or pale'  // 0
      });

      expect(result, 'Score: 0 - Critical condition');
    });

    test('evaluates APGAR score formula - Invalid value throws exception', () async {
      final corpus = await testCorpus;
      final formula = corpus.getFormula("Apgar Score")!;
      final evaluator = FormulaEvaluator();

      expect(() => evaluator.evaluate(formula, {
        'HeartRate': 'Invalid Value',  // Not in allowed values
        'Breathing': 'Absent',  // 0
        'MuscleTone': 'None',  // 0
        'Reflexes': 'No response',  // 0
        'SkinColor': 'Blue or pale'  // 0
      }), throwsA(isA<FormulaEvaluationException>()));
    });
  });

}