import 'package:clide/builtin/claude/src/slash_commands.dart';
import 'package:test/test.dart';

void main() {
  group('slashCommandToken', () {
    test('extracts the command word from single-line slash input', () {
      expect(slashCommandToken('/model sonnet'), 'model');
      expect(slashCommandToken('/whats-next'), 'whats-next');
      expect(slashCommandToken('/foo\tbar'), 'foo');
    });

    test('returns null for non-command input', () {
      expect(slashCommandToken('hello'), isNull);
      expect(slashCommandToken(' /leading-space'), isNull);
      expect(slashCommandToken('/'), isNull); // empty token
      expect(slashCommandToken('/foo\nbar'), isNull); // multi-line
    });
  });

  group('isKnownSlashCommand', () {
    const known = {'model', 'clear', 'whats-next'};

    test('true only when the token is a recognised command', () {
      expect(isKnownSlashCommand('/model opus', known), isTrue);
      expect(isKnownSlashCommand('/whats-next', known), isTrue);
      expect(isKnownSlashCommand('/unknown-cmd', known), isFalse);
    });

    test('a path-like leading slash is not a command (stays literal)', () {
      expect(isKnownSlashCommand('/tmp/foo.log has errors', known), isFalse);
    });

    test('non-slash and multi-line input is never a command', () {
      expect(isKnownSlashCommand('hello world', known), isFalse);
      expect(isKnownSlashCommand('/clear\nand more', {'clear'}), isFalse);
    });
  });

  group('clideOwnedCommand', () {
    test('recognises /clear and /resume as clide-owned', () {
      expect(clideOwnedCommand('/clear'), 'clear');
      expect(clideOwnedCommand('/clear '), 'clear');
      expect(clideOwnedCommand('/resume'), 'resume');
    });

    test('recognises /model with and without an argument (T-408)', () {
      expect(clideOwnedCommand('/model'), 'model');
      expect(clideOwnedCommand('/model sonnet'), 'model');
    });

    test('returns null for commands clide forwards to Claude', () {
      expect(clideOwnedCommand('/compact'), isNull);
      expect(clideOwnedCommand('not a command'), isNull);
      expect(clideOwnedCommand('/clearairspace'), isNull); // token must be exactly "clear"
    });
  });

  group('slashCommandArg', () {
    test('returns the trimmed argument after the command token', () {
      expect(slashCommandArg('/model sonnet'), 'sonnet');
      expect(slashCommandArg('/model  claude-opus-4-8 '), 'claude-opus-4-8');
      expect(slashCommandArg('/model\tsonnet'), 'sonnet');
    });

    test('empty for a bare command, null for non-command input', () {
      expect(slashCommandArg('/model'), '');
      expect(slashCommandArg('/model '), '');
      expect(slashCommandArg('hello'), isNull);
      expect(slashCommandArg('/foo\nbar'), isNull);
    });
  });

  group('activeSlashQuery', () {
    test('matches a slash token at the cursor, including inline', () {
      expect(activeSlashQuery('/mod', 4), const SlashQuery(start: 0, query: 'mod'));
      expect(activeSlashQuery('go /mo', 6), const SlashQuery(start: 3, query: 'mo'));
      expect(activeSlashQuery('/', 1), const SlashQuery(start: 0, query: ''));
    });

    test('no match for paths, post-space, or non-slash runs', () {
      expect(activeSlashQuery('a/b', 3), isNull); // slash mid-token (path)
      expect(activeSlashQuery('/model sonnet', 13), isNull); // closed after space
      expect(activeSlashQuery('hello', 5), isNull);
      expect(activeSlashQuery('/model ', 7), isNull); // cursor right after space
    });

    test('uses the cursor, not the end of text', () {
      // Cursor sits right after "/mo" inside "/model".
      expect(activeSlashQuery('/model', 3), const SlashQuery(start: 0, query: 'mo'));
    });

    test('hyphens are part of the command token, not a boundary (T-278)', () {
      expect(activeSlashQuery('/add-dir', 8), const SlashQuery(start: 0, query: 'add-dir'));
      expect(activeSlashQuery('/add-', 5), const SlashQuery(start: 0, query: 'add-'));
      expect(activeSlashQuery('go /output-st', 13), const SlashQuery(start: 3, query: 'output-st'));
    });
  });

  group('filterSlashCommands', () {
    const commands = ['model', 'memory', 'clear', 'compact', 'context'];

    test('prefix-filters case-insensitively and sorts', () {
      expect(filterSlashCommands('co', commands), ['compact', 'context']);
      expect(filterSlashCommands('M', commands), ['memory', 'model']);
    });

    test('empty query returns all (sorted, capped)', () {
      expect(filterSlashCommands('', commands, limit: 3), ['clear', 'compact', 'context']);
    });

    test('de-duplicates', () {
      expect(filterSlashCommands('p', ['pql', 'pql', 'plan']), ['plan', 'pql']);
    });

    test('keeps filtering through a hyphen in the query (T-278)', () {
      const hyphenated = ['add-dir', 'add-context', 'agents', 'output-style'];
      // Typing the '-' narrows rather than emptying the list.
      expect(filterSlashCommands('add', hyphenated), ['add-context', 'add-dir']);
      expect(filterSlashCommands('add-', hyphenated), ['add-context', 'add-dir']);
      expect(filterSlashCommands('add-d', hyphenated), ['add-dir']);
    });
  });

  group('completeSlash', () {
    test('replaces the token with /command and a trailing space', () {
      const q = SlashQuery(start: 0, query: 'mo');
      final r = completeSlash('/mo', q, 'model');
      expect(r.text, '/model ');
      expect(r.cursor, 7);
    });

    test('completes an inline token without disturbing surrounding text', () {
      const q = SlashQuery(start: 3, query: 'mo');
      final r = completeSlash('go /mo now', q, 'model');
      expect(r.text, 'go /model  now');
      expect(r.cursor, 10);
    });
  });

  group('routeSlashCommand (T-411)', () {
    // The probed 2.1.175 shape: skills + headless builtins.
    const advertised = ['compact', 'context', 'usage', 'whats-next', 'git-commit'];

    test('non-command text routes null (normal message send)', () {
      expect(routeSlashCommand('hello world', advertised: advertised), isNull);
      expect(routeSlashCommand('multi\n/line', advertised: advertised), isNull);
    });

    test('a path-like leading slash is an unknown token → forward (stays literal)', () {
      expect(routeSlashCommand('/tmp/x.log explain', advertised: advertised), SlashRoute.forward);
    });

    test('owned beats everything', () {
      for (final t in [
        '/clear',
        '/resume',
        '/fork',
        '/model opus',
        '/effort high',
        '/permissions plan',
        '/status',
        '/config',
        '/mcp',
        '/agents',
        '/hooks',
        '/memory',
        '/help',
      ]) {
        expect(routeSlashCommand(t, advertised: advertised), SlashRoute.owned, reason: t);
      }
    });

    test('advertised commands (skills + headless builtins) forward', () {
      expect(routeSlashCommand('/compact', advertised: advertised), SlashRoute.forward);
      expect(routeSlashCommand('/usage', advertised: advertised), SlashRoute.forward);
      expect(routeSlashCommand('/whats-next', advertised: advertised), SlashRoute.forward);
    });

    test('a known TUI-only builtin routes unavailable', () {
      for (final t in ['/cost', '/doctor', '/login', '/rewind', '/output-style']) {
        expect(routeSlashCommand(t, advertised: advertised), SlashRoute.unavailable, reason: t);
      }
    });

    test('an advertised name shadows the TUI-only catalog (a skill named like a builtin forwards)', () {
      // 'cost' is in the catalog but not owned — advertising it wins.
      expect(routeSlashCommand('/cost', advertised: ['cost']), SlashRoute.forward);
    });

    test('an unknown token forwards (stays literal text downstream)', () {
      expect(routeSlashCommand('/no-such-thing', advertised: advertised), SlashRoute.forward);
    });
  });

  group('tuiOnlyNotice (T-411)', () {
    test('carries the clide-native pointer when the catalog has one', () {
      final n = tuiOnlyNotice('cost');
      expect(n, contains('/cost is a Claude Code TUI command'));
      expect(n, contains('Activity tab'));
    });

    test('plain notice when there is no pointer', () {
      final n = tuiOnlyNotice('terminal-setup');
      expect(n, contains('/terminal-setup is a Claude Code TUI command'));
      expect(n, isNot(contains('→')));
    });
  });
}