// ignore_for_file: unnecessary_lambdas

import 'package:petitparser/petitparser.dart';
import 'package:test/test.dart';

import 'utils/matchers.dart';

class ListGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref0(list).end();

  Parser list() => ref0(element) & char(',') & ref0(list) | ref0(element);

  Parser element() => digit().plus().flatten();
}

class ListParserDefinition extends ListGrammarDefinition {
  @override
  Parser element() =>
      super.element().map((value) => int.parse(value as String));
}

class TokenizedListGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref0(list).end();

  Parser list() =>
      ref0(element) & ref1(token, char(',')) & ref0(list) | ref0(element);

  Parser element() => ref1(token, digit().plus());

  Parser token(Parser parser) => parser.flatten().trim();
}

class TypedReferencesGrammarDefinition extends GrammarDefinition {
  @override
  Parser<List<String>> start() => ref0(f0);

  Parser<List<String>> f0() => ref1(f1, 1);

  Parser<List<String>> f1(int a1) => ref2(f2, a1, 2);

  Parser<List<String>> f2(int a1, int a2) => ref3(f3, a1, a2, 3);

  Parser<List<String>> f3(int a1, int a2, int a3) => ref4(f4, a1, a2, a3, 4);

  Parser<List<String>> f4(int a1, int a2, int a3, int a4) =>
      ref5(f5, a1, a2, a3, a4, 5);

  Parser<List<String>> f5(int a1, int a2, int a3, int a4, int a5) => [
    a1.toString().toParser(),
    a2.toString().toParser(),
    a3.toString().toParser(),
    a4.toString().toParser(),
    a5.toString().toParser(),
  ].toSequenceParser();
}

class UntypedReferencesGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref0(f0);

  Parser f0() => ref1(f1, 1);

  Parser f1(int a1) => ref2(f2, a1, 2);

  Parser f2(int a1, int a2) => ref3(f3, a1, a2, 3);

  Parser f3(int a1, int a2, int a3) => ref4(f4, a1, a2, a3, 4);

  Parser f4(int a1, int a2, int a3, int a4) => ref5(f5, a1, a2, a3, a4, 5);

  Parser f5(int a1, int a2, int a3, int a4, int a5) => [
    a1.toString().toParser(),
    a2.toString().toParser(),
    a3.toString().toParser(),
    a4.toString().toParser(),
    a5.toString().toParser(),
  ].toSequenceParser();
}

class DeprecatedUntypedReferencesGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref(f0);

  Parser f0() => ref(f1, 1);

  Parser f1(int a1) => ref(f2, a1, 2);

  Parser f2(int a1, int a2) => ref(f3, a1, a2, 3);

  Parser f3(int a1, int a2, int a3) => ref(f4, a1, a2, a3, 4);

  Parser f4(int a1, int a2, int a3, int a4) => ref(f5, a1, a2, a3, a4, 5);

  Parser f5(int a1, int a2, int a3, int a4, int a5) => [
    a1.toString().toParser(),
    a2.toString().toParser(),
    a3.toString().toParser(),
    a4.toString().toParser(),
    a5.toString().toParser(),
  ].toSequenceParser();
}

class BuggedGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => epsilon();

  Parser directRecursion1() => ref0(directRecursion1);

  Parser indirectRecursion1() => ref0(indirectRecursion2);

  Parser indirectRecursion2() => ref0(indirectRecursion3);

  Parser indirectRecursion3() => ref0(indirectRecursion1);

  Parser delegation1() => ref0(delegation2);

  Parser delegation2() => ref0(delegation3);

  Parser delegation3() => epsilon();
}

class LambdaGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref0(expression).end();

  Parser expression() => ref0(variable) | ref0(abstraction) | ref0(application);

  Parser variable() => (letter() & word().star()).flatten().trim();

  Parser abstraction() =>
      token('\\') & ref0(variable) & token('.') & ref0(expression);

  Parser application() =>
      token('(') & ref0(expression) & ref0(expression) & token(')');

  Parser token(String value) => char(value).trim();
}

class ExpressionGrammarDefinition extends GrammarDefinition {
  @override
  Parser start() => ref0(terms).end();

  Parser terms() => ref0(addition) | ref0(factors);

  Parser addition() =>
      ref0(factors).plusSeparated(token(char('+') | char('-')));

  Parser factors() => ref0(multiplication) | ref0(power);

  Parser multiplication() =>
      ref0(power).plusSeparated(token(char('*') | char('/')));

  Parser power() => ref0(primary).plusSeparated(char('^').trim());

  Parser primary() => ref0(number) | ref0(parentheses);

  Parser number() => token(
    char('-').optional() &
        digit().plus() &
        (char('.') & digit().plus()).optional(),
  );

  Parser parentheses() => token('(') & ref0(terms) & token(')');

  Parser token(Object value) {
    if (value is String) {
      return char(value).trim();
    } else if (value is Parser) {
      return value.flatten().trim();
    }
    throw ArgumentError.value(value, 'unable to parse');
  }
}

void main() {
  group('reference & resolve', () {
    Parser<String> numberToken() =>
        (char('-').optional() &
                digit().plus() &
                (char('.') & digit().plus()).optional())
            .flatten()
            .trim();
    Parser<num> number() => ref0(numberToken).map(num.parse);
    Parser<List<num>> numberList([String separator = ',']) => ref0(
      number,
    ).plusSeparated(separator.toParser()).map((list) => list.elements);

    test('reference without parameters', () {
      final firstReference = ref0(number);
      final secondReference = ref0(number);
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isTrue);
    });
    test('reference with different production', () {
      final firstReference = ref0(number);
      final secondReference = ref0(numberToken);
      expect(firstReference, isNot(same(secondReference)));
      // ignore: unrelated_type_equality_checks
      expect(firstReference == secondReference, isFalse);
    });
    test('reference with same parameters', () {
      final firstReference = ref1(numberList, ',');
      final secondReference = ref1(numberList, ',');
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isTrue);
    });
    test('reference with different parameters', () {
      final firstReference = ref1(numberList, ',');
      final secondReference = ref1(numberList, ';');
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isFalse);
    });
    test('reference unsupported methods', () {
      final reference = ref0(number);
      expect(() => reference.copy(), throwsUnsupportedError);
      expect(() => reference.parse('0'), throwsUnsupportedError);
      expect(() => reference.fastParseOn('0', 0), throwsUnsupportedError);
    });
    test('references typed', () {
      Parser<List<String>> f9(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
        int a8,
        int a9,
      ) => [
        a1,
        a2,
        a3,
        a4,
        a5,
        a6,
        a7,
        a8,
        a9,
      ].map((value) => value.toString().toParser()).toSequenceParser();
      Parser<List<String>> f8(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
        int a8,
      ) => ref9(f9, a1, a2, a3, a4, a5, a6, a7, a8, 9);
      Parser<List<String>> f7(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
      ) => ref8(f8, a1, a2, a3, a4, a5, a6, a7, 8);
      Parser<List<String>> f6(int a1, int a2, int a3, int a4, int a5, int a6) =>
          ref7(f7, a1, a2, a3, a4, a5, a6, 7);
      Parser<List<String>> f5(int a1, int a2, int a3, int a4, int a5) =>
          ref6(f6, a1, a2, a3, a4, a5, 6);
      Parser<List<String>> f4(int a1, int a2, int a3, int a4) =>
          ref5(f5, a1, a2, a3, a4, 5);
      Parser<List<String>> f3(int a1, int a2, int a3) =>
          ref4(f4, a1, a2, a3, 4);
      Parser<List<String>> f2(int a1, int a2) => ref3(f3, a1, a2, 3);
      Parser<List<String>> f1(int a1) => ref2(f2, a1, 2);
      Parser<List<String>> f0() => ref1(f1, 1);
      Parser<List<String>> start() => ref0(f0);
      expect(
        resolve(start()),
        isParseSuccess('123456789', result: '123456789'.split('')),
      );
    });
    test('references untyped', () {
      Parser<List<String>> f9(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
        int a8,
        int a9,
      ) => [
        a1,
        a2,
        a3,
        a4,
        a5,
        a6,
        a7,
        a8,
        a9,
      ].map((value) => value.toString().toParser()).toSequenceParser();
      Parser<List<String>> f8(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
        int a8,
      ) => ref(f9, a1, a2, a3, a4, a5, a6, a7, a8, 9);
      Parser<List<String>> f7(
        int a1,
        int a2,
        int a3,
        int a4,
        int a5,
        int a6,
        int a7,
      ) => ref(f8, a1, a2, a3, a4, a5, a6, a7, 8);
      Parser<List<String>> f6(int a1, int a2, int a3, int a4, int a5, int a6) =>
          ref(f7, a1, a2, a3, a4, a5, a6, 7);
      Parser<List<String>> f5(int a1, int a2, int a3, int a4, int a5) =>
          ref(f6, a1, a2, a3, a4, a5, 6);
      Parser<List<String>> f4(int a1, int a2, int a3, int a4) =>
          ref(f5, a1, a2, a3, a4, 5);
      Parser<List<String>> f3(int a1, int a2, int a3) => ref(f4, a1, a2, a3, 4);
      Parser<List<String>> f2(int a1, int a2) => ref(f3, a1, a2, 3);
      Parser<List<String>> f1(int a1) => ref(f2, a1, 2);
      Parser<List<String>> f0() => ref(f1, 1);
      Parser<List<String>> start() => ref(f0);
      expect(
        resolve(start()),
        isParseSuccess('123456789', result: '123456789'.split('')),
      );
    });
    test('resolved parser', () {
      expect(resolve(number()), isParseSuccess('1', result: 1));
      expect(resolve(numberList()), isParseSuccess('1,2', result: [1, 2]));
    });
    test('resolved parser with arguments', () {
      expect(resolve(numberList()), isParseSuccess('1,2', result: [1, 2]));
      expect(
        resolve(numberList(';')),
        isParseSuccess('3;4;5', result: [3, 4, 5]),
      );
    });
    test('direct recursion', () {
      Parser<String> create() => ref0(create);
      expect(() => resolve(create()), throwsStateError);
    });
    test('reference', () {
      Parser<List<num>> list() => [
        (ref0(number) & char(',') & ref0(list)).map(
          (values) => <num>[values[0] as num, ...values[2] as Iterable<num>],
        ),
        ref0(number).map((value) => [value]),
      ].toChoiceParser();
      final parser = resolve<List<num>>(list());
      expect(parser, isParseSuccess('1', result: [1]));
      expect(parser, isParseSuccess('1,2', result: [1, 2]));
      expect(parser, isParseSuccess('1,2,2', result: [1, 2, 2]));
    });
  });
  group('definition', () {
    final grammarDefinition = ListGrammarDefinition();
    final parserDefinition = ListParserDefinition();
    final tokenDefinition = TokenizedListGrammarDefinition();
    final typedReferenceDefinition = TypedReferencesGrammarDefinition();
    final untypedReferenceDefinition = UntypedReferencesGrammarDefinition();
    final deprecatedUntypedReferenceDefinition =
        DeprecatedUntypedReferencesGrammarDefinition();
    final buggedDefinition = BuggedGrammarDefinition();

    test('reference without parameters', () {
      final firstReference = ref0(grammarDefinition.start);
      final secondReference = ref0(grammarDefinition.start);
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isTrue);
    });
    test('reference with different production', () {
      final firstReference = ref0(grammarDefinition.start);
      final secondReference = ref0(grammarDefinition.element);
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isFalse);
    });
    test('reference with same parameters', () {
      final firstReference = ref1(typedReferenceDefinition.f1, 42);
      final secondReference = ref1(typedReferenceDefinition.f1, 42);
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isTrue);
    });
    test('reference with different parameters', () {
      final firstReference = ref1(typedReferenceDefinition.f1, 42);
      final secondReference = ref1(typedReferenceDefinition.f1, 43);
      expect(firstReference, isNot(same(secondReference)));
      expect(firstReference == secondReference, isFalse);
    });
    test('reference with multiple arguments', () {
      final parser = typedReferenceDefinition.build();
      expect(
        parser,
        isParseSuccess('12345', result: ['1', '2', '3', '4', '5']),
      );
    });
    test('reference with multiple arguments (untyped)', () {
      final parser = untypedReferenceDefinition.build();
      expect(
        parser,
        isParseSuccess('12345', result: ['1', '2', '3', '4', '5']),
      );
    });
    test('reference with multiple arguments (untyped, deprecated)', () {
      final parser = deprecatedUntypedReferenceDefinition.build();
      expect(
        parser,
        isParseSuccess('12345', result: ['1', '2', '3', '4', '5']),
      );
    });
    test('reference unsupported methods', () {
      final reference = ref0(grammarDefinition.start);
      expect(() => reference.copy(), throwsUnsupportedError);
      expect(() => reference.parse(''), throwsUnsupportedError);
    });
    test('grammar', () {
      final parser = grammarDefinition.build();
      expect(parser, isParseSuccess('1,2', result: ['1', ',', '2']));
      expect(
        parser,
        isParseSuccess(
          '1,2,3',
          result: [
            '1',
            ',',
            ['2', ',', '3'],
          ],
        ),
      );
    });
    test('parser', () {
      final parser = parserDefinition.build();
      expect(parser, isParseSuccess('1,2', result: [1, ',', 2]));
      expect(
        parser,
        isParseSuccess(
          '1,2,3',
          result: [
            1,
            ',',
            [2, ',', 3],
          ],
        ),
      );
    });
    test('token', () {
      final parser = tokenDefinition.build();
      expect(parser, isParseSuccess('1, 2', result: ['1', ',', '2']));
      expect(
        parser,
        isParseSuccess(
          '1, 2, 3',
          result: [
            '1',
            ',',
            ['2', ',', '3'],
          ],
        ),
      );
    });
    test('direct recursion', () {
      expect(
        () => buggedDefinition.buildFrom(buggedDefinition.directRecursion1()),
        throwsStateError,
      );
    });
    test('indirect recursion', () {
      expect(
        () => buggedDefinition.buildFrom(buggedDefinition.indirectRecursion1()),
        throwsStateError,
      );
      expect(
        () => buggedDefinition.buildFrom(buggedDefinition.indirectRecursion2()),
        throwsStateError,
      );
      expect(
        () => buggedDefinition.buildFrom(buggedDefinition.indirectRecursion3()),
        throwsStateError,
      );
    });
    test('delegation', () {
      expect(
        buggedDefinition.buildFrom(buggedDefinition.delegation1()),
        isA<EpsilonParser<void>>(),
      );
      expect(
        buggedDefinition.buildFrom(buggedDefinition.delegation2()),
        isA<EpsilonParser<void>>(),
      );
      expect(
        buggedDefinition.buildFrom(buggedDefinition.delegation3()),
        isA<EpsilonParser<void>>(),
      );
    });
    test('lambda example', () {
      final definition = LambdaGrammarDefinition();
      final parser = definition.build();
      expect(parser, isParseSuccess('x', result: isNotNull));
      expect(parser, isParseSuccess('xy', result: isNotNull));
      expect(parser, isParseSuccess('x12', result: isNotNull));
      expect(parser, isParseSuccess('\\x.y', result: isNotNull));
      expect(parser, isParseSuccess('\\x.\\y.z', result: isNotNull));
      expect(parser, isParseSuccess('(x x)', result: isNotNull));
      expect(parser, isParseSuccess('(x y)', result: isNotNull));
      expect(parser, isParseSuccess('(x (y z))', result: isNotNull));
      expect(parser, isParseSuccess('((x y) z)', result: isNotNull));
    });
    test('expression example', () {
      final definition = ExpressionGrammarDefinition();
      final parser = definition.build();
      expect(parser, isParseSuccess('1', result: isNotNull));
      expect(parser, isParseSuccess('12', result: isNotNull));
      expect(parser, isParseSuccess('1.23', result: isNotNull));
      expect(parser, isParseSuccess('-12.3', result: isNotNull));
      expect(parser, isParseSuccess('1 + 2', result: isNotNull));
      expect(parser, isParseSuccess('1 + 2 + 3', result: isNotNull));
      expect(parser, isParseSuccess('1 - 2', result: isNotNull));
      expect(parser, isParseSuccess('1 - 2 - 3', result: isNotNull));
      expect(parser, isParseSuccess('1 * 2', result: isNotNull));
      expect(parser, isParseSuccess('1 * 2 * 3', result: isNotNull));
      expect(parser, isParseSuccess('1 / 2', result: isNotNull));
      expect(parser, isParseSuccess('1 / 2 / 3', result: isNotNull));
      expect(parser, isParseSuccess('1 ^ 2', result: isNotNull));
      expect(parser, isParseSuccess('1 ^ 2 ^ 3', result: isNotNull));
      expect(parser, isParseSuccess('1 + (2 * 3)', result: isNotNull));
      expect(parser, isParseSuccess('(1 + 2) * 3', result: isNotNull));
    });
  });
}