import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:life_helper/ai/tools/tool_envelope.dart';

void main() {
  group('ToolResult', () {
    test('ToolOk JSON 형태', () {
      const r = ToolOk({'a': 1});
      expect(r.toJson(), {
        'status': 'ok',
        'data': {'a': 1}
      });
    });

    test('ToolErr JSON 형태', () {
      const r = ToolErr('validation', '잘못된 인자');
      expect(r.toJson(), {
        'status': 'error',
        'code': 'validation',
        'reason': '잘못된 인자',
      });
    });

    test('ToolCancelled JSON 형태', () {
      const r = ToolCancelled();
      expect(r.toJson(), {
        'status': 'cancelled',
        'reason': 'user did not confirm',
      });
    });
  });

  group('encodeToolResult 2KB cap', () {
    test('payload 작으면 그대로', () {
      const r = ToolOk({'k': 'v'});
      final s = encodeToolResult(r);
      expect(jsonDecode(s), {
        'status': 'ok',
        'data': {'k': 'v'}
      });
    });

    test('payload 2KB 초과 시 truncation hint 로 대체', () {
      final big = ToolOk({'blob': 'x' * 5000});
      final s = encodeToolResult(big);
      expect(s.length, lessThan(500));
      final decoded = jsonDecode(s) as Map<String, dynamic>;
      expect(decoded['status'], 'ok');
      final data = decoded['data'] as Map<String, dynamic>;
      expect(data['_truncated'], true);
      expect(data['_hint'], contains('query_protocol'));
    });

    test('error/cancelled 는 작아서 그대로', () {
      expect(
        encodeToolResult(const ToolErr('e', 'r')).length,
        lessThan(100),
      );
      expect(
        encodeToolResult(const ToolCancelled()).length,
        lessThan(100),
      );
    });
  });
}