import "dart:io";
import "package:test/test.dart";
import "package:clawd_code/src/tools/file_read_tool.dart";


void main() {
  late FileReadTool tool;
  late Directory tempDir;

  setUp(() async {
    tool = FileReadTool();
    tempDir = await Directory.systemTemp.createTemp("file_read_test_");
  });

  tearDown(() async {
    await tempDir.delete(recursive: true);
  });

  group("FileReadTool", () {
    test("reads a known file with line numbers", () async {
      final f = File("${tempDir.path}/sample.txt");
      await f.writeAsString("hello\nworld\n");

      final result = await tool.execute({"file_path": f.path});
      expect(result, contains("hello"));
      expect(result, contains("world"));
      // line numbers present
      expect(result, contains("1"));
    });

    test("returns error for missing file", () async {
      final result = await tool.execute({"file_path": "/does/not/exist.txt"});
      expect(result.toLowerCase(), contains("error"));
    });

    test("respects offset and limit", () async {
      final f = File("${tempDir.path}/multiline.txt");
      await f.writeAsString("line1\nline2\nline3\nline4\nline5\n");

      final result = await tool.execute({
        "file_path": f.path,
        "offset": 1,
        "limit": 2,
      });

      expect(result, contains("line2"));
      expect(result, contains("line3"));
      expect(result, isNot(contains("line1")));
      expect(result, isNot(contains("line4")));
    });

    test("empty file returns empty marker", () async {
      final f = File("${tempDir.path}/empty.txt");
      await f.writeAsString("");

      final result = await tool.execute({"file_path": f.path});
      expect(result, contains("1\t"));
    });
  });
}