// Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:dartdoc/src/comment_references/parser.dart';
import 'package:test/test.dart';

void main() {
  void expectParseEquivalent(String codeRef, List<String> parts,
      {bool constructorHint = false, bool callableHint = false}) {
    var result = CommentReferenceParser(codeRef).parse();
    var hasCallableHint =
        result.isNotEmpty && result.last is CallableHintEndNode;
    var stringParts = result.whereType<IdentifierNode>().map((i) => i.text);
    expect(stringParts, equals(parts));
    expect(hasCallableHint, equals(callableHint));
  }

  void expectParsePassthrough(String codeRef) =>
      expectParseEquivalent(codeRef, [codeRef]);

  void expectParseError(String codeRef) {
    expect(CommentReferenceParser(codeRef).parse().whereType<IdentifierNode>(),
        isEmpty);
  }

  group('StringTrie tests', () {
    test('test partials', () {
      var trie = StringTrie()..addWord('longerString');
      expect(trie.match('l'), equals(-1));
      expect(trie.match('longerStringWithExtras'), equals(12));
      expect(trie.match('longerString'), equals(12));
      expect(trie.match('prefix-longerString'), equals(-1));
    });

    test('substrings', () {
      var trie = StringTrie();
      trie.addWord('aString');
      trie.addWord('aStr');
      trie.addWord('a');
      expect(trie.match('a'), equals(1));
      expect(trie.match('aS'), equals(1));
      expect(trie.match('aStr'), equals(4));
      expect(trie.match('aStringTwo'), equals(7));
    });
  });

  group('Basic comment reference parsing', () {
    test('Check that basic references parse', () {
      expectParseEquivalent('Funvas.u', ['Funvas', 'u']);
      expectParseEquivalent('valid', ['valid']);
      expectParseEquivalent('valid()', ['valid'], callableHint: true);
      expectParseEquivalent('const valid()', ['valid'], callableHint: true);
      expectParseEquivalent('final valid', ['valid']);
      expectParseEquivalent('this.is.valid', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid()', ['this', 'is', 'valid'],
          callableHint: true);
      expectParseEquivalent('const this.is.valid', ['this', 'is', 'valid']);
      expectParseEquivalent('final this.is.valid', ['this', 'is', 'valid']);
      expectParseEquivalent('var this.is.valid', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid?', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid!', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid<>', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid<stuff>', ['this', 'is', 'valid']);
      expectParseEquivalent('this.is.valid(things)', ['this', 'is', 'valid']);
      expectParseEquivalent('\nthis.is.valid', ['this', 'is', 'valid']);
    });

    test('Check that cases dependent on prefix resolution not firing parse',
        () {
      expectParsePassthrough('constant');
      expectParsePassthrough('newThingy');
      expectParsePassthrough('operatorThingy');
      expectParseEquivalent('operator+', ['+']);
      expectParseError('const()');
      expectParsePassthrough('new');
      expectParseEquivalent('new()', ['new'], callableHint: true);
    });

    test('Check that operator references parse', () {
      expectParsePassthrough('[]');
      expectParsePassthrough('<=');
      expectParsePassthrough('>=');
      expectParsePassthrough('>');
      expectParsePassthrough('>>');
      expectParsePassthrough('>>>');
      expectParseEquivalent('operator []', ['[]']);
      expectParseEquivalent('operator       []', ['[]']);
      expectParseEquivalent('operator[]', ['[]']);
      expectParseEquivalent('operator <=', ['<=']);
      expectParseEquivalent('operator >=', ['>=']);

      expectParseEquivalent('ThisThingy.operator []', ['ThisThingy', '[]']);
      expectParseEquivalent('ThisThingy.operator [].parameter',
          ['ThisThingy', '[]', 'parameter']);
    });

    test('Check that embedded types within tearoff-like constructs parse', () {
      expectParseEquivalent('this<stuff>.isValid', ['this', 'isValid']);
      expectParseEquivalent(
          'this<stuff, is, also>.isValid', ['this', 'isValid']);
      expectParseEquivalent('this<stuff<that<is, real>, complicated>>.isValid',
          ['this', 'isValid']);
      expectParseError('this<stuff.isntValid');
      expectParseError('this<stuff>, notBeingValid>.isntValid');
      expectParseError('(AndThisMayBeValidDart.butIt).isntValidInReferences');
      expectParseError('<NotActually>.valid');
    });

    test('Basic negative tests', () {
      expectParseError(r'.');
      expectParseError(r'');
      expectParseError('foo(wefoi');
      expectParseError('<MoofMilker>');
      expectParseError('>%');
      expectParseError('>=>');
    });
  });
}