/// Bird's-eye overview of all five piles with demote / refine actions.
library;

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../models/value_card.dart';
import '../models/value_pile.dart';
import '../providers/values_sort_provider.dart';
import '../widgets/practice_chrome.dart';
import '../widgets/value_card_tile.dart';

class SortedOverviewScreen extends StatefulWidget {
  const SortedOverviewScreen({super.key});

  @override
  State<SortedOverviewScreen> createState() => _SortedOverviewScreenState();
}

class _SortedOverviewScreenState extends State<SortedOverviewScreen> {
  String _query = '';
  ValuePile? _filter;

  @override
  Widget build(BuildContext context) {
    final sort = context.watch<ValuesSortController>();
    final text = Theme.of(context).textTheme;
    final colors = Theme.of(context).colorScheme;

    return PracticeScaffold(
      header: Padding(
        padding: const EdgeInsets.fromLTRB(8, 4, 12, 0),
        child: Row(
          children: [
            IconButton(
              onPressed: sort.goToHub,
              icon: const Icon(Icons.arrow_back),
            ),
            Expanded(
              child: Text(
                'All Sorted Values',
                style: text.labelMedium,
              ),
            ),
          ],
        ),
      ),
      child: ListView(
        children: [
          Text('All Sorted Values', style: text.displaySmall),
          const SizedBox(height: 16),
          TextField(
            onChanged: (v) => setState(() => _query = v.trim().toLowerCase()),
            decoration: const InputDecoration(
              hintText: 'Find a value (e.g., Creativity)',
              prefixIcon: Icon(Icons.search),
            ),
          ),
          const SizedBox(height: 10),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: [
                _FilterChip(
                  label: 'All (${sort.totalCount})',
                  selected: _filter == null,
                  onTap: () => setState(() => _filter = null),
                ),
                ...ValuePile.values.map((pile) {
                  return _FilterChip(
                    label: '${pile.shortLabel} (${sort.countInPile(pile)})',
                    selected: _filter == pile,
                    accent: pile.accent,
                    onTap: () => setState(() => _filter = pile),
                  );
                }),
              ],
            ),
          ),
          const SizedBox(height: 18),
          ...ValuePile.values
              .where((p) => _filter == null || _filter == p)
              .map((pile) {
            final cards = sort.cardsInPile(pile).where((c) {
              if (_query.isEmpty) return true;
              return c.title.toLowerCase().contains(_query) ||
                  c.description.toLowerCase().contains(_query);
            }).toList();

            return _PileSection(
              pile: pile,
              cards: cards,
              onDemote: (card) => _showDemoteSheet(context, sort, card),
            );
          }),
          const SizedBox(height: 12),
          Text(
            'Tip: refine any pile before ranking your core values.',
            style: text.bodySmall?.copyWith(color: colors.onSurfaceVariant),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }

  Future<void> _showDemoteSheet(
    BuildContext context,
    ValuesSortController sort,
    ValueCard card,
  ) async {
    await showModalBottomSheet<void>(
      context: context,
      isScrollControlled: true,
      builder: (ctx) {
        final text = Theme.of(ctx).textTheme;
        final colors = Theme.of(ctx).colorScheme;
        final maxHeight = MediaQuery.sizeOf(ctx).height * 0.75;
        return SafeArea(
          child: ConstrainedBox(
            constraints: BoxConstraints(maxHeight: maxHeight),
            child: SingleChildScrollView(
              padding: EdgeInsets.fromLTRB(
                24,
                8,
                24,
                MediaQuery.paddingOf(ctx).bottom + 24,
              ),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Expanded(
                        child: Text(
                          'Reorder ${card.title}',
                          style: text.titleLarge,
                        ),
                      ),
                      IconButton(
                        onPressed: () => Navigator.pop(ctx),
                        icon: const Icon(Icons.close),
                      ),
                    ],
                  ),
                  Text('Move to pile:', style: text.bodyMedium),
                  const SizedBox(height: 8),
                  ...ValuePile.values.map((pile) {
                    final current = sort.assignments[card.id] == pile;
                    return ListTile(
                      contentPadding: EdgeInsets.zero,
                      enabled: !current,
                      leading: CircleAvatar(
                        backgroundColor: pile.accent.withValues(alpha: 0.2),
                        child: Text(
                          '${pile.rank}',
                          style: text.labelMedium?.copyWith(color: pile.accent),
                        ),
                      ),
                      title: Text(pile.label),
                      subtitle: Text(pile.subtitle),
                      trailing: current
                          ? Icon(Icons.check, color: colors.primary)
                          : Icon(Icons.arrow_forward, color: colors.onSurfaceVariant),
                      onTap: current
                          ? null
                          : () {
                              sort.moveCard(card.id, pile);
                              Navigator.pop(ctx);
                            },
                    );
                  }),
                ],
              ),
            ),
          ),
        );
      },
    );
  }
}

class _FilterChip extends StatelessWidget {
  const _FilterChip({
    required this.label,
    required this.selected,
    required this.onTap,
    this.accent,
  });

  final String label;
  final bool selected;
  final VoidCallback onTap;
  final Color? accent;

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    final labelColor = selected ? colors.onPrimary : colors.onSurface;
    return Padding(
      padding: const EdgeInsets.only(right: 8),
      child: ChoiceChip(
        label: Text(label),
        selected: selected,
        onSelected: (_) => onTap(),
        showCheckmark: true,
        checkmarkColor: colors.onPrimary,
        selectedColor: colors.primary,
        backgroundColor: colors.surfaceContainer,
        labelStyle: Theme.of(context).textTheme.labelMedium?.copyWith(
              color: labelColor,
              fontWeight: selected ? FontWeight.w700 : FontWeight.w500,
            ),
        side: BorderSide(
          color: selected
              ? colors.primary
              : (accent ?? colors.outlineVariant),
        ),
      ),
    );
  }
}

class _PileSection extends StatelessWidget {
  const _PileSection({
    required this.pile,
    required this.cards,
    required this.onDemote,
  });

  final ValuePile pile;
  final List<ValueCard> cards;
  final void Function(ValueCard card) onDemote;

  @override
  Widget build(BuildContext context) {
    final text = Theme.of(context).textTheme;

    return Padding(
      padding: const EdgeInsets.only(bottom: 22),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.circle, size: 12, color: pile.accent),
              const SizedBox(width: 8),
              Expanded(
                child: Text(
                  '${pile.label} · ${cards.length} cards',
                  style: text.titleLarge,
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          if (pile == ValuePile.mostImportant)
            ...cards.map(
              (card) => Padding(
                padding: const EdgeInsets.only(bottom: 10),
                child: ValueCardTile(
                  card: card,
                  compact: true,
                  trailing: TextButton(
                    onPressed: () => onDemote(card),
                    child: const Text('Reorder'),
                  ),
                ),
              ),
            )
          else
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: cards
                  .map(
                    (c) => ValueChip(
                      title: c.title,
                      onTap: () => onDemote(c),
                    ),
                  )
                  .toList(),
            ),
        ],
      ),
    );
  }
}