import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/annotations.dart';
import 'package:mockito/mockito.dart';
import 'package:xterm/buffer/buffer.dart';
import 'package:xterm/buffer/line/line.dart';
import 'package:xterm/terminal/cursor.dart';
import 'package:xterm/terminal/terminal_search.dart';
import 'package:xterm/terminal/terminal_search_interaction.dart';
import 'package:xterm/util/circular_list.dart';
import 'package:xterm/util/unicode_v11.dart';

import 'terminal_search_test.mocks.dart';

class TerminalSearchTestCircularList extends CircularList<BufferLine> {
  TerminalSearchTestCircularList(int maxLines) : super(maxLines);
}

@GenerateMocks([
  TerminalSearchInteraction,
  Buffer,
  TerminalSearchTestCircularList,
  BufferLine
])
void main() {
  group('Terminal Search Tests', () {
    test('Creation works', () {
      _TestFixture();
    });

    test('Doesn\'t trigger anything when not activated', () {
      final fixture = _TestFixture();
      verifyNoMoreInteractions(fixture.terminalSearchInteractionMock);
      final task = fixture.uut.createSearchTask('testsearch');
      task.pattern = "some test";
      task.isActive = false;
      task.searchResult;
    });

    test('Basic search works', () {
      final fixture = _TestFixture();
      fixture.expectTerminalSearchContent(['Simple Content']);
      final task = fixture.uut.createSearchTask('testsearch');
      task.isActive = true;
      task.pattern = 'content';
      task.options = TerminalSearchOptions(
          caseSensitive: false, matchWholeWord: false, useRegex: false);
      final result = task.searchResult;
      expect(result.allHits.length, 1);
      expect(result.allHits[0].startLineIndex, 0);
      expect(result.allHits[0].startIndex, 7);
      expect(result.allHits[0].endLineIndex, 0);
      expect(result.allHits[0].endIndex, 14);
    });

    test('Multiline search works', () {
      final fixture = _TestFixture();
      fixture.expectTerminalSearchContent(['Simple Content', 'Second Line']);
      final task = fixture.uut.createSearchTask('testsearch');
      task.isActive = true;
      task.pattern = 'line';
      task.options = TerminalSearchOptions(
          caseSensitive: false, matchWholeWord: false, useRegex: false);
      final result = task.searchResult;
      expect(result.allHits.length, 1);
      expect(result.allHits[0].startLineIndex, 1);
      expect(result.allHits[0].startIndex, 7);
      expect(result.allHits[0].endLineIndex, 1);
      expect(result.allHits[0].endIndex, 11);
    });

    test('Emoji search works', () {
      final fixture = _TestFixture();
      fixture.expectBufferContentLine([
        '🍏',
        '🍎',
        '🍐',
        '🍊',
        '🍋',
        '🍌',
        '🍉',
        '🍇',
        '🍓',
        '🫐',
        '🍈',
        '🍒',
        '🍑'
      ]);
      final task = fixture.uut.createSearchTask('testsearch');
      task.isActive = true;
      task.pattern = '🍋';
      task.options = TerminalSearchOptions(
          caseSensitive: false, matchWholeWord: false, useRegex: false);
      final result = task.searchResult;
      expect(result.allHits.length, 1);
      expect(result.allHits[0].startLineIndex, 0);
      expect(result.allHits[0].startIndex, 8);
      expect(result.allHits[0].endLineIndex, 0);
      expect(result.allHits[0].endIndex, 10);
    });

    test('CJK search works', () {
      final fixture = _TestFixture();
      fixture.expectBufferContentLine(['こ', 'ん', 'に', 'ち', 'は', '世', '界']);
      final task = fixture.uut.createSearchTask('testsearch');
      task.isActive = true;
      task.pattern = 'は';
      task.options = TerminalSearchOptions(
          caseSensitive: false, matchWholeWord: false, useRegex: false);
      final result = task.searchResult;
      expect(result.allHits.length, 1);
      expect(result.allHits[0].startLineIndex, 0);
      expect(result.allHits[0].startIndex, 8);
      expect(result.allHits[0].endLineIndex, 0);
      expect(result.allHits[0].endIndex, 10);
    });

    test('Finding strings directly on line break works', () {
      final fixture = _TestFixture();
      fixture.expectTerminalSearchContent([
        'The search hit is '.padRight(fixture.terminalWidth - 3) + 'spl',
        'it over two lines',
      ]);
      final task = fixture.uut.createSearchTask('testsearch');
      task.isActive = true;
      task.pattern = 'split';
      task.options = TerminalSearchOptions(
          caseSensitive: false, matchWholeWord: false, useRegex: false);
      final result = task.searchResult;
      expect(result.allHits.length, 1);
      expect(result.allHits[0].startLineIndex, 0);
      expect(result.allHits[0].startIndex, 77);
      expect(result.allHits[0].endLineIndex, 1);
      expect(result.allHits[0].endIndex, 2);
    });
  });

  test('Option: case sensitivity works', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(['Simple Content', 'Second Line']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.pattern = 'line';
    task.options = TerminalSearchOptions(
        caseSensitive: true, matchWholeWord: false, useRegex: false);

    final result = task.searchResult;
    expect(result.allHits.length, 0);

    task.pattern = 'Line';
    final secondResult = task.searchResult;
    expect(secondResult.allHits.length, 1);
    expect(secondResult.allHits[0].startLineIndex, 1);
    expect(secondResult.allHits[0].startIndex, 7);
    expect(secondResult.allHits[0].endLineIndex, 1);
    expect(secondResult.allHits[0].endIndex, 11);
  });

  test('Option: whole word works', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(['Simple Content', 'Second Line']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.pattern = 'lin';
    task.options = TerminalSearchOptions(
        caseSensitive: false, matchWholeWord: true, useRegex: false);

    final result = task.searchResult;
    expect(result.allHits.length, 0);

    task.pattern = 'line';
    final secondResult = task.searchResult;
    expect(secondResult.allHits.length, 1);
    expect(secondResult.allHits[0].startLineIndex, 1);
    expect(secondResult.allHits[0].startIndex, 7);
    expect(secondResult.allHits[0].endLineIndex, 1);
    expect(secondResult.allHits[0].endIndex, 11);
  });

  test('Option: regex works', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(['Simple Content', 'Second Line']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.options = TerminalSearchOptions(
        caseSensitive: false, matchWholeWord: false, useRegex: true);

    task.pattern =
        r'(^|\s)\w{4}($|\s)'; // match exactly 4 characters (and the whitespace before and/or after)
    final secondResult = task.searchResult;
    expect(secondResult.allHits.length, 1);
    expect(secondResult.allHits[0].startLineIndex, 1);
    expect(secondResult.allHits[0].startIndex, 6);
    expect(secondResult.allHits[0].endLineIndex, 1);
    expect(secondResult.allHits[0].endIndex, 12);
  });

  test('Retrigger search when a BufferLine got dirty works', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(
        ['Simple Content', 'Second Line', 'Third row']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.options = TerminalSearchOptions(
        caseSensitive: false, matchWholeWord: false, useRegex: false);

    task.pattern = 'line';
    final result = task.searchResult;
    expect(result.allHits.length, 1);

    // overwrite expectations, nothing dirty => no new search
    fixture.expectTerminalSearchContent(
        ['Simple Content', 'Second Line', 'Third line'],
        isSearchStringCached: true);
    task.isActive = false;
    task.isActive = true;

    final secondResult = task.searchResult;
    expect(secondResult.allHits.length,
        1); // nothing was dirty => we get the cached search result

    // overwrite expectations, one line is dirty => new search
    fixture.expectTerminalSearchContent(
        ['Simple Content', 'Second Line', 'Third line'],
        isSearchStringCached: false,
        dirtyIndices: [1]);

    final thirdResult = task.searchResult;
    expect(thirdResult.allHits.length,
        2); //search has happened again so the new content is found

    // overwrite expectations, content has changed => new search
    fixture.expectTerminalSearchContent(
        ['First line', 'Second Line', 'Third line'],
        isSearchStringCached: false,
        dirtyIndices: [0]);

    final fourthResult = task.searchResult;
    expect(fourthResult.allHits.length,
        3); //search has happened again so the new content is found
  });
  test('Handles regex special characters in non regex mode correctly', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(['Simple Content', 'Second Line.\\{']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.pattern = 'line.\\{';
    task.options = TerminalSearchOptions(
        caseSensitive: false, matchWholeWord: false, useRegex: false);

    final result = task.searchResult;
    expect(result.allHits.length, 1);
    expect(result.allHits[0].startLineIndex, 1);
    expect(result.allHits[0].startIndex, 7);
    expect(result.allHits[0].endLineIndex, 1);
    expect(result.allHits[0].endIndex, 14);
  });
  test('TerminalWidth change leads to retriggering search', () {
    final fixture = _TestFixture();
    fixture.expectTerminalSearchContent(['Simple Content', 'Second Line']);
    final task = fixture.uut.createSearchTask('testsearch');
    task.isActive = true;
    task.pattern = 'line';
    task.options = TerminalSearchOptions(
        caseSensitive: false, matchWholeWord: false, useRegex: false);

    final result = task.searchResult;
    expect(result.allHits.length, 1);

    // change data to detect a search re-run
    fixture.expectTerminalSearchContent(
        ['First line', 'Second Line']); //has 2 hits
    task.isActive = false;
    task.isActive = true;
    final secondResult = task.searchResult;
    expect(
        secondResult.allHits.length, 1); //nothing changed so the cache is used

    fixture.terminalWidth = 79;
    task.isActive = false;
    task.isActive = true;
    final thirdResult = task.searchResult;
    //we changed the terminal width which triggered a re-run of the search
    expect(thirdResult.allHits.length, 2);
  });
}

class _TestFixture {
  _TestFixture({
    terminalWidth = 80,
  }) : _terminalWidth = terminalWidth {
    uut = TerminalSearch(terminalSearchInteractionMock);
    when(terminalSearchInteractionMock.terminalWidth).thenReturn(terminalWidth);
  }

  int _terminalWidth;
  int get terminalWidth => _terminalWidth;
  set terminalWidth(int terminalWidth) {
    _terminalWidth = terminalWidth;
    when(terminalSearchInteractionMock.terminalWidth).thenReturn(terminalWidth);
  }

  void expectBufferContentLine(
    List<String> cellData, {
    isUsingAltBuffer = false,
  }) {
    final buffer = _getBufferFromCellData(cellData);
    when(terminalSearchInteractionMock.buffer).thenReturn(buffer);
    when(terminalSearchInteractionMock.isUsingAltBuffer())
        .thenReturn(isUsingAltBuffer);
  }

  void expectTerminalSearchContent(
    List<String> lines, {
    isUsingAltBuffer = false,
    isSearchStringCached = true,
    List<int>? dirtyIndices,
  }) {
    final buffer = _getBuffer(lines,
        isCached: isSearchStringCached, dirtyIndices: dirtyIndices);

    when(terminalSearchInteractionMock.buffer).thenReturn(buffer);
    when(terminalSearchInteractionMock.isUsingAltBuffer())
        .thenReturn(isUsingAltBuffer);
  }

  final terminalSearchInteractionMock = MockTerminalSearchInteraction();
  late final TerminalSearch uut;

  MockBuffer _getBufferFromCellData(List<String> cellData) {
    final result = MockBuffer();
    final circularList = MockTerminalSearchTestCircularList();
    when(result.lines).thenReturn(circularList);
    when(circularList[0]).thenReturn(_getBufferLineFromData(cellData));
    when(circularList.length).thenReturn(1);

    return result;
  }

  MockBuffer _getBuffer(
    List<String> lines, {
    isCached = true,
    List<int>? dirtyIndices,
  }) {
    final result = MockBuffer();
    final circularList = MockTerminalSearchTestCircularList();
    when(result.lines).thenReturn(circularList);

    final bufferLines = _getBufferLinesWithSearchContent(
      lines,
      isCached: isCached,
      dirtyIndices: dirtyIndices,
    );

    when(circularList[any]).thenAnswer(
        (realInvocation) => bufferLines[realInvocation.positionalArguments[0]]);
    when(circularList.length).thenReturn(bufferLines.length);

    return result;
  }

  BufferLine _getBufferLineFromData(List<String> cellData) {
    final result = BufferLine(length: _terminalWidth);
    int currentIndex = 0;
    for (var data in cellData) {
      final codePoint = data.runes.first;
      final width = unicodeV11.wcwidth(codePoint);
      result.cellInitialize(
        currentIndex,
        content: codePoint,
        width: width,
        cursor: Cursor(bg: 0, fg: 0, flags: 0),
      );
      currentIndex++;
      for (int i = 1; i < width; i++) {
        result.cellInitialize(
          currentIndex,
          content: 0,
          width: 0,
          cursor: Cursor(bg: 0, fg: 0, flags: 0),
        );
        currentIndex++;
      }
    }
    return result;
  }

  List<MockBufferLine> _getBufferLinesWithSearchContent(
    List<String> content, {
    isCached = true,
    List<int>? dirtyIndices,
  }) {
    final result = List<MockBufferLine>.empty(growable: true);
    for (int i = 0; i < content.length; i++) {
      final bl = MockBufferLine();
      when(bl.hasCachedSearchString).thenReturn(isCached);
      when(bl.toSearchString(any)).thenReturn(content[i]);
      if (dirtyIndices?.contains(i) ?? false) {
        when(bl.isTagDirty(any)).thenReturn(true);
      } else {
        when(bl.isTagDirty(any)).thenReturn(false);
      }
      result.add(bl);
    }

    return result;
  }
}