/// Unit tests for `lib/src/pty/env.dart` and
/// `lib/src/pty/errors.dart`.
library;

import 'dart:io';

import 'package:clide/src/pty/env.dart';
import 'package:clide/src/pty/errors.dart';
import 'package:test/test.dart';

void main() {
  group('PtyException', () {
    test('toString includes the op + message', () {
      const e = PtyException('posix_spawn', 'kaboom');
      expect(e.toString(), contains('posix_spawn'));
      expect(e.toString(), contains('kaboom'));
      expect(e.toString(), isNot(contains('errno=')));
    });

    test('toString embeds errno when present', () {
      const e = PtyException('execve', 'no such file', errno: 2);
      expect(e.toString(), contains('errno=2'));
    });
  });

  group('expandedPath (delegates to the shared resolver, T-439)', () {
    test('non-empty on every platform', () {
      expect(expandedPath, isNotEmpty);
    });

    test('is a superset of the process PATH (never drops entries)', () {
      final got = expandedPath.split(':').toSet();
      for (final dir in (Platform.environment['PATH'] ?? '').split(':').where((e) => e.isNotEmpty)) {
        expect(got, contains(dir));
      }
    });
  });

  group('mergePtyEnv', () {
    test('clide defaults override the process env where they overlap', () {
      final merged = mergePtyEnv(processEnv: {'TERM': 'dumb', 'CUSTOM': 'preserved'});
      expect(merged['TERM'], 'xterm-256color'); // clide default wins
      expect(merged['COLORTERM'], 'truecolor');
      expect(merged['CUSTOM'], 'preserved'); // process env retained
    });

    test('overrides win over both process env and clide defaults', () {
      final merged = mergePtyEnv(processEnv: {'TERM': 'dumb'}, overrides: {'TERM': 'screen-256color'});
      expect(merged['TERM'], 'screen-256color');
    });

    test('no overrides argument is equivalent to overrides = null', () {
      final a = mergePtyEnv(processEnv: const {'X': '1'});
      final b = mergePtyEnv(processEnv: const {'X': '1'}, overrides: null);
      expect(a, b);
    });

    test('clidePtyEnvDefaults set the expected truecolour keys', () {
      expect(clidePtyEnvDefaults['TERM'], 'xterm-256color');
      expect(clidePtyEnvDefaults['COLORTERM'], 'truecolor');
      expect(clidePtyEnvDefaults['CLICOLOR_FORCE'], '1');
    });
  });
}