import 'package:flutter/material.dart';

import '../data/repository.dart';
import '../theme/lawheatmap_theme.dart';
import '../theme/lawheatmap_tokens.dart';
import '../widgets/delta_mark.dart';
import 'shell_page.dart';

/// First-run landing: brand mark, one-line claim, "enter app" CTA.
/// Mock-mode bypasses Hub connect; the live wire lands in week 1.
class LandingPage extends StatelessWidget {
  const LandingPage({super.key, required this.repository});

  final EvaluationRepository repository;

  @override
  Widget build(BuildContext context) {
    final t = Theme.of(context).textTheme;
    return Scaffold(
      body: SafeArea(
        child: Center(
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 720),
            child: Padding(
              padding: const EdgeInsets.symmetric(
                horizontal: LawHeatmapSpace.xxl,
                vertical: LawHeatmapSpace.xxxl,
              ),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const DeltaMark(size: 96),
                  const SizedBox(height: LawHeatmapSpace.xxl),
                  Text('F∆I Law-Heatmap', style: t.displaySmall),
                  const SizedBox(height: LawHeatmapSpace.sm),
                  Text(
                    'Pflicht-basierte Wirkungsanalyse von Rechtsnormen — '
                    'auf Ch∆In, mit Quellen-Audit by construction.',
                    style: t.bodyLarge
                        ?.copyWith(color: LawHeatmapColors.mute),
                  ),
                  const SizedBox(height: LawHeatmapSpace.xxl),
                  Wrap(
                    crossAxisAlignment: WrapCrossAlignment.center,
                    spacing: LawHeatmapSpace.md,
                    runSpacing: LawHeatmapSpace.sm,
                    children: [
                      FilledButton.icon(
                        onPressed: () {
                          Navigator.of(context).pushReplacement(
                            MaterialPageRoute(
                              builder: (_) =>
                                  ShellPage(repository: repository),
                            ),
                          );
                        },
                        icon: const Icon(Icons.east),
                        label: const Text('App öffnen (Demo-Modus)'),
                      ),
                      Text(
                        'Demo: 5 Pilot-Normen, ohne Hub-Verbindung',
                        style: t.labelSmall?.copyWith(
                          color: LawHeatmapColors.mute,
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: LawHeatmapSpace.xl),
                  Text(
                    'v0.1.0  ·  Phase 0  ·  Mock-Modus  ·  '
                    'Live-Hub-Anbindung folgt in Woche 1',
                    style: LawHeatmapTheme.mono(
                      t.labelSmall ?? const TextStyle(),
                    ).copyWith(color: LawHeatmapColors.mute),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}