import 'dart:io';

import 'package:clide/src/ipc/paths.dart';
import 'package:test/test.dart';

void main() {
  group('workspaceSocketPath (D-70)', () {
    test('returns the FNV-1a hashed path under the socket directory', () {
      final p = workspaceSocketPath('/home/me/projects/clide');
      expect(p, startsWith('${socketDirectory()}/'));
      expect(p, endsWith('.sock'));
      // 16-char hex hash.
      final hash = p.split('/').last.replaceAll('.sock', '');
      expect(hash, matches(RegExp(r'^[0-9a-f]{16}$')));
    });

    test('is deterministic for the same input', () {
      expect(workspaceSocketPath('/home/me/repo'), workspaceSocketPath('/home/me/repo'));
    });

    test('different workspace roots hash to different paths', () {
      expect(workspaceSocketPath('/home/me/repo-a'), isNot(workspaceSocketPath('/home/me/repo-b')));
    });

    test('socketDirectory uses XDG_RUNTIME_DIR on Linux when set', () {
      if (Platform.isMacOS) return;
      final xdg = Platform.environment['XDG_RUNTIME_DIR'];
      if (xdg != null && xdg.isNotEmpty) {
        expect(socketDirectory(), '$xdg/clide');
      } else {
        expect(socketDirectory(), '/tmp/clide');
      }
    });

    test('socketDirectory uses ~/Library/Caches on macOS', () {
      if (!Platform.isMacOS) return;
      final home = Platform.environment['HOME']!;
      expect(socketDirectory(), '$home/Library/Caches/clide');
    });
  });

  group('logDirectory (T-425)', () {
    test('is a persistent, non-ephemeral location distinct from the socket dir', () {
      // The freeze evidence must survive a reboot, so logs must NOT live in
      // the ephemeral socket/runtime dir.
      expect(logDirectory(), isNot(socketDirectory()));
    });

    test('Linux: XDG_STATE_HOME/clide/logs when set, else ~/.local/state/...', () {
      if (Platform.isMacOS || Platform.isWindows) return;
      final state = Platform.environment['XDG_STATE_HOME'];
      if (state != null && state.isNotEmpty) {
        expect(logDirectory(), '$state/clide/logs');
      } else {
        final home = Platform.environment['HOME'] ?? '/tmp';
        expect(logDirectory(), '$home/.local/state/clide/logs');
      }
    });

    test('macOS: ~/Library/Logs/clide (not Caches)', () {
      if (!Platform.isMacOS) return;
      final home = Platform.environment['HOME']!;
      expect(logDirectory(), '$home/Library/Logs/clide');
    });

    test('CLIDE_LOG_DIR overrides everything (CI artifact / test redirect)', () {
      expect(logDirectory({'CLIDE_LOG_DIR': '/tmp/ci-logs'}), '/tmp/ci-logs');
      // Empty override is ignored — falls through to the platform default.
      expect(logDirectory({'CLIDE_LOG_DIR': '', 'XDG_STATE_HOME': '/x', 'HOME': '/h'}), isNot('/'));
    });
  });

  group('fnv1a64Hex (T-126 cross-check)', () {
    // Reference values from <http://isthe.com/chongo/tech/comp/fnv/>.
    // The C client in native/clide-cli/clide.c MUST produce the same
    // 16-char hex strings for the same inputs, or server + client see
    // different socket paths and the integration falls apart silently.
    test('empty string → offset basis', () {
      expect(fnv1a64Hex(''), 'cbf29ce484222325');
    });

    test('"a" → reference value', () {
      expect(fnv1a64Hex('a'), 'af63dc4c8601ec8c');
    });

    test('"foo" → reference value', () {
      expect(fnv1a64Hex('foo'), 'dcb27518fed9d577');
    });

    test('"/home/me/projects/clide" → 16 hex chars, deterministic', () {
      final h = fnv1a64Hex('/home/me/projects/clide');
      expect(h, matches(RegExp(r'^[0-9a-f]{16}$')));
      expect(fnv1a64Hex('/home/me/projects/clide'), h);
    });
  });
}