import 'package:flutter/material.dart';

import '../data/models.dart';
import '../data/repository.dart';
import '../theme/reclaim_tokens.dart';
import '../widgets/mode_banner.dart';
import '../widgets/evidence_sidebar.dart';
import '../widgets/norm_text_card.dart';
import '../widgets/reclaim_card.dart';
import '../widgets/tier_badge.dart';

class NormDetailPage extends StatelessWidget {
  const NormDetailPage({
    super.key,
    required this.repository,
    required this.evaluation,
  });

  final EvaluationRepository repository;
  final Evaluation evaluation;

  @override
  Widget build(BuildContext context) {
    final t = Theme.of(context).textTheme;
    final e = evaluation;
    return Scaffold(
      appBar: AppBar(
        title: Text('${e.norm.jurabk} ${e.norm.paragraph}'),
      ),
      body: Column(
        children: [
          ModeBanner(repository: repository),
          Expanded(
            child: SingleChildScrollView(
              padding: const EdgeInsets.all(ReclaimSpace.xl),
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(
                    flex: 3,
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Expanded(
                              child: Column(
                                crossAxisAlignment:
                                    CrossAxisAlignment.start,
                                children: [
                                  Text(e.norm.title,
                                      style: t.displaySmall),
                                  const SizedBox(height: 4),
                                  SelectableText(
                                    e.norm.eli,
                                    style: t.bodyLarge?.copyWith(
                                      fontFamily:
                                          ReclaimTypography.mono,
                                      color: ReclaimColors.mute,
                                    ),
                                  ),
                                ],
                              ),
                            ),
                            TierBadge(tier: e.tierLowest),
                          ],
                        ),
                        const SizedBox(height: ReclaimSpace.lg),
                        _MetricsRow(e: e),
                        const SizedBox(height: ReclaimSpace.lg),
                        NormTextCard(norm: e.norm),
                        const SizedBox(height: ReclaimSpace.lg),
                        ReclaimCard(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text('Pflichten',
                                  style: t.headlineSmall),
                              const SizedBox(
                                  height: ReclaimSpace.sm),
                              Text(
                                'Atomare deontische Aussagen, extrahiert '
                                'aus dem Norm-Text (Phase 1: regex + LLM-'
                                'Vorschlag, Juristen-Review obligatorisch).',
                                style: t.labelSmall?.copyWith(
                                    color: ReclaimColors.mute),
                              ),
                              const SizedBox(
                                  height: ReclaimSpace.md),
                              for (final d in e.duties)
                                _DutyTile(duty: d),
                            ],
                          ),
                        ),
                        if (e.notes != null) ...[
                          const SizedBox(height: ReclaimSpace.lg),
                          ReclaimCard(
                            child: Column(
                              crossAxisAlignment:
                                  CrossAxisAlignment.start,
                              children: [
                                Text('Methodik-Notiz',
                                    style: t.headlineSmall),
                                const SizedBox(
                                    height: ReclaimSpace.sm),
                                Text(e.notes!, style: t.bodyLarge),
                              ],
                            ),
                          ),
                        ],
                      ],
                    ),
                  ),
                  const SizedBox(width: ReclaimSpace.xl),
                  SizedBox(
                    width: 340,
                    child: EvidenceSidebar(evaluation: e),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _MetricsRow extends StatelessWidget {
  const _MetricsRow({required this.e});
  final Evaluation e;

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        _MetricBox(
          label: 'Schaden',
          value: _eur(e.skmEurPerYear),
          sub: 'SKM P×F×T×h',
        ),
        const SizedBox(width: ReclaimSpace.md),
        _MetricBox(
          label: 'Nutzen',
          value: '${e.benefitScore.toStringAsFixed(1)} / 5',
          sub: '7-dim. Score',
        ),
        const SizedBox(width: ReclaimSpace.md),
        _MetricBox(
          label: 'Betroffene',
          value: _kmu(e.affectedCount),
          sub: 'DESTATIS',
        ),
        const SizedBox(width: ReclaimSpace.md),
        _MetricBox(
          label: 'Frust',
          value: '${e.frustScore.toStringAsFixed(1)} / 10',
          sub: 'Lesbarkeit + Tiefe',
        ),
      ],
    );
  }

  static String _eur(double v) {
    if (v >= 1e9) return '${(v / 1e9).toStringAsFixed(2)} Mrd €';
    if (v >= 1e6) return '${(v / 1e6).toStringAsFixed(1)} Mio €';
    if (v >= 1e3) return '${(v / 1e3).toStringAsFixed(0)} k €';
    return '${v.toStringAsFixed(0)} €';
  }

  static String _kmu(int n) {
    if (n >= 1_000_000) return '${(n / 1e6).toStringAsFixed(1)} Mio';
    if (n >= 1_000) return '${(n / 1e3).toStringAsFixed(0)} k';
    return n.toString();
  }
}

class _MetricBox extends StatelessWidget {
  const _MetricBox({
    required this.label,
    required this.value,
    required this.sub,
  });
  final String label;
  final String value;
  final String sub;

  @override
  Widget build(BuildContext context) {
    final t = Theme.of(context).textTheme;
    return Expanded(
      child: ReclaimCard(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(label,
                style: t.labelSmall
                    ?.copyWith(color: ReclaimColors.mute)),
            const SizedBox(height: 4),
            Text(value, style: t.displaySmall),
            const SizedBox(height: 4),
            Text(sub,
                style: t.labelSmall
                    ?.copyWith(color: ReclaimColors.mute)),
          ],
        ),
      ),
    );
  }
}

class _DutyTile extends StatelessWidget {
  const _DutyTile({required this.duty});
  final Duty duty;

  @override
  Widget build(BuildContext context) {
    final t = Theme.of(context).textTheme;
    return Padding(
      padding: const EdgeInsets.only(bottom: ReclaimSpace.md),
      child: Container(
        padding: const EdgeInsets.all(ReclaimSpace.md),
        decoration: BoxDecoration(
          border: Border.all(
              color: Theme.of(context)
                  .colorScheme
                  .onSurface
                  .withValues(alpha: 0.12)),
          borderRadius: const BorderRadius.all(ReclaimRadius.sm),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(children: [
              Container(
                padding: const EdgeInsets.symmetric(
                    horizontal: 6, vertical: 2),
                decoration: BoxDecoration(
                  color: ReclaimColors.signal.withValues(alpha: 0.18),
                  borderRadius:
                      const BorderRadius.all(ReclaimRadius.sm),
                ),
                child: Text(
                  duty.modality,
                  style: t.labelSmall?.copyWith(
                    color: ReclaimColors.signal,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
              const SizedBox(width: ReclaimSpace.sm),
              Text(duty.sourceNorm,
                  style: t.labelSmall?.copyWith(
                    fontFamily: ReclaimTypography.mono,
                    color: ReclaimColors.mute,
                  )),
            ]),
            const SizedBox(height: ReclaimSpace.sm),
            Text(duty.action, style: t.bodyLarge),
            const SizedBox(height: 4),
            Text(
              'Adressat: ${duty.addressee}   ·   '
              'Frequenz: ${duty.frequency}'
              '${duty.authority != null ? "   ·   Behörde: ${duty.authority}" : ""}'
              '${duty.consequence != null ? "   ·   Sanktion: ${duty.consequence}" : ""}',
              style: t.labelSmall?.copyWith(color: ReclaimColors.mute),
            ),
          ],
        ),
      ),
    );
  }
}