import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

import '../core/theme.dart';
import '../models/compliance.dart';
import '../state/compliance_controller.dart';
import '../state/shifts_controller.dart';
import '../widgets/common.dart';
import 'shift_detail_screen.dart';

/// Everything one business asks for, on its own screen.
///
/// The shift page shows the same check inline; this is the full read, grouped
/// the way the compliance hub groups things, so it is obvious *which* kind of
/// item is missing and where to go and fix it.
class RequirementsScreen extends ConsumerWidget {
  const RequirementsScreen({super.key, required this.shiftId});

  final String shiftId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final shift = ref.watch(shiftsProvider.notifier).byId(shiftId);
    if (shift == null) {
      return Scaffold(
        appBar: AppBar(),
        body: const Center(child: Text('That shift is no longer listed.')),
      );
    }

    final compliance = ref.watch(complianceProvider);

    /// The items this shift needs, split by which compliance section they
    /// belong to, so each group can be labelled and linked separately.
    List<ComplianceItem> group(ComplianceSection section) => compliance
        .section(section)
        .where((i) => shift.requirements.contains(i.title))
        .toList();

    final groups = <(ComplianceSection, String, List<ComplianceItem>)>[
      (
        ComplianceSection.documents,
        'Documents',
        group(ComplianceSection.documents),
      ),
      (ComplianceSection.wardrobe, 'Attire', group(ComplianceSection.wardrobe)),
      (
        ComplianceSection.certificates,
        'Certificates',
        group(ComplianceSection.certificates),
      ),
    ];

    return Scaffold(
      appBar: AppBar(
        title: const Text('Requirements'),
        actions: [
          Padding(
            padding: const EdgeInsets.only(right: 16),
            child: Center(
              child: IconButton(
                onPressed: () => context.push('/support'),
                icon: const Icon(LucideIcons.messageCircle, size: 20),
                tooltip: 'Message the manager',
              ),
            ),
          ),
        ],
      ),
      body: ListView(
        padding: const EdgeInsets.fromLTRB(20, 8, 20, 28),
        children: [
          Text(
            '${shift.role} at ${shift.business}',
            style: const TextStyle(
              fontSize: 22,
              fontWeight: FontWeight.w700,
              letterSpacing: -0.7,
            ),
          ),
          const SizedBox(height: 16),
          // The same summary the shift page shows, so the two never disagree.
          ShiftRequirements(shift: shift),
          for (final (section, label, items) in groups)
            if (items.isNotEmpty) ...[
              SectionLabel(
                label,
                trailing: TextButton(
                  onPressed: () => context.push('/compliance/${section.name}'),
                  child: const Text('Manage'),
                ),
              ),
              KrowCard(
                padding: const EdgeInsets.symmetric(horizontal: 16),
                child: Column(
                  children: [
                    for (var i = 0; i < items.length; i++) ...[
                      if (i > 0) const Divider(height: 1),
                      _RequirementRow(item: items[i]),
                    ],
                  ],
                ),
              ),
            ],
          const SizedBox(height: 16),
          const InfoBanner(
            'These are shared with the business only while you are booked on '
            'one of their shifts.',
          ),
        ],
      ),
    );
  }
}

class _RequirementRow extends StatelessWidget {
  const _RequirementRow({required this.item});

  final ComplianceItem item;

  @override
  Widget build(BuildContext context) {
    final ok = item.state == ComplianceState.verified;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 11),
      child: Row(
        children: [
          Container(
            width: 22,
            height: 22,
            decoration: BoxDecoration(
              color: ok ? KrowPalette.blueTint : const Color(0xFFF7E4AE),
              borderRadius: BorderRadius.circular(7),
            ),
            child: Icon(
              ok ? LucideIcons.check : LucideIcons.clock,
              size: 12,
              color: ok ? KrowPalette.blue : KrowPalette.ink,
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  item.title,
                  style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                  ),
                ),
                const SizedBox(height: 1),
                Text(
                  item.subtitle,
                  style: const TextStyle(
                    fontSize: 12,
                    height: 1.4,
                    color: KrowPalette.mute,
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(width: 8),
          StatusChip(item.badge, tone: ok ? ChipTone.neutral : ChipTone.yellow),
        ],
      ),
    );
  }
}