// Copyright (c) 2013, 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:source_maps/parser.dart' show Mapping, parse;
import 'package:source_maps/refactor.dart';
import 'package:source_span/source_span.dart';
import 'package:term_glyph/term_glyph.dart' as term_glyph;
import 'package:test/test.dart';

void main() {
  setUpAll(() {
    term_glyph.ascii = true;
  });

  group('conflict detection', () {
    var original = '0123456789abcdefghij';
    var file = SourceFile.fromString(original);

    test('no conflict, in order', () {
      var txn = TextEditTransaction(original, file);
      txn.edit(2, 4, '.');
      txn.edit(5, 5, '|');
      txn.edit(6, 6, '-');
      txn.edit(6, 7, '_');
      expect((txn.commit()..build('')).text, '01.4|5-_789abcdefghij');
    });

    test('no conflict, out of order', () {
      var txn = TextEditTransaction(original, file);
      txn.edit(2, 4, '.');
      txn.edit(5, 5, '|');

      // Regresion test for issue #404: there is no conflict/overlap for edits
      // that don't remove any of the original code.
      txn.edit(6, 7, '_');
      txn.edit(6, 6, '-');
      expect((txn.commit()..build('')).text, '01.4|5-_789abcdefghij');
    });

    test('conflict', () {
      var txn = TextEditTransaction(original, file);
      txn.edit(2, 4, '.');
      txn.edit(3, 3, '-');
      expect(
          () => txn.commit(),
          throwsA(
              predicate((e) => e.toString().contains('overlapping edits'))));
    });
  });

  test('generated source maps', () {
    var original =
        '0123456789\n0*23456789\n01*3456789\nabcdefghij\nabcd*fghij\n';
    var file = SourceFile.fromString(original);
    var txn = TextEditTransaction(original, file);
    txn.edit(27, 29, '__\n    ');
    txn.edit(34, 35, '___');
    var printer = (txn.commit()..build(''));
    var output = printer.text;
    var map = parse(printer.map!);
    expect(output,
        '0123456789\n0*23456789\n01*34__\n    789\na___cdefghij\nabcd*fghij\n');

    // Line 1 and 2 are unmodified: mapping any column returns the beginning
    // of the corresponding line:
    expect(
        _span(1, 1, map, file),
        'line 1, column 1: \n'
        '  ,\n'
        '1 | 0123456789\n'
        '  | ^\n'
        "  '");
    expect(
        _span(1, 5, map, file),
        'line 1, column 1: \n'
        '  ,\n'
        '1 | 0123456789\n'
        '  | ^\n'
        "  '");
    expect(
        _span(2, 1, map, file),
        'line 2, column 1: \n'
        '  ,\n'
        '2 | 0*23456789\n'
        '  | ^\n'
        "  '");
    expect(
        _span(2, 8, map, file),
        'line 2, column 1: \n'
        '  ,\n'
        '2 | 0*23456789\n'
        '  | ^\n'
        "  '");

    // Line 3 is modified part way: mappings before the edits have the right
    // mapping, after the edits the mapping is null.
    expect(
        _span(3, 1, map, file),
        'line 3, column 1: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  | ^\n'
        "  '");
    expect(
        _span(3, 5, map, file),
        'line 3, column 1: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  | ^\n'
        "  '");

    // Start of edits map to beginning of the edit secion:
    expect(
        _span(3, 6, map, file),
        'line 3, column 6: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  |      ^\n'
        "  '");
    expect(
        _span(3, 7, map, file),
        'line 3, column 6: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  |      ^\n'
        "  '");

    // Newly added lines had no additional mapping, so they inherit the last
    // position on the previously mapped line. The end of the region continues
    // where the previous mapping left off.
    expect(
        _span(4, 1, map, file),
        'line 3, column 6: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  |      ^\n'
        '  \'');
    expect(
        _span(4, 5, map, file),
        'line 3, column 8: \n'
        '  ,\n'
        '3 | 01*3456789\n'
        '  |        ^\n'
        "  '");

    // Subsequent lines are still mapped correctly:
    // a (in a___cd...)
    expect(
        _span(5, 1, map, file),
        'line 4, column 1: \n'
        '  ,\n'
        '4 | abcdefghij\n'
        '  | ^\n'
        "  '");
    // _ (in a___cd...)
    expect(
        _span(5, 2, map, file),
        'line 4, column 2: \n'
        '  ,\n'
        '4 | abcdefghij\n'
        '  |  ^\n'
        "  '");
    // _ (in a___cd...)
    expect(
        _span(5, 3, map, file),
        'line 4, column 2: \n'
        '  ,\n'
        '4 | abcdefghij\n'
        '  |  ^\n'
        "  '");
    // _ (in a___cd...)
    expect(
        _span(5, 4, map, file),
        'line 4, column 2: \n'
        '  ,\n'
        '4 | abcdefghij\n'
        '  |  ^\n'
        "  '");
    // c (in a___cd...)
    expect(
        _span(5, 5, map, file),
        'line 4, column 3: \n'
        '  ,\n'
        '4 | abcdefghij\n'
        '  |   ^\n'
        "  '");
    expect(
        _span(6, 1, map, file),
        'line 5, column 1: \n'
        '  ,\n'
        '5 | abcd*fghij\n'
        '  | ^\n'
        "  '");
    expect(
        _span(6, 8, map, file),
        'line 5, column 1: \n'
        '  ,\n'
        '5 | abcd*fghij\n'
        '  | ^\n'
        "  '");
  });
}

String? _span(int line, int column, Mapping map, SourceFile file) =>
    map.spanFor(line - 1, column - 1, files: {'': file})?.message('').trim();