/// Stage 1 — assign each value card into one of five reflective piles.
library;

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

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

class CardSortingScreen extends StatelessWidget {
  const CardSortingScreen({super.key});

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

    return PracticeScaffold(
      padding: const EdgeInsets.fromLTRB(20, 4, 20, 8),
      header: Padding(
        padding: const EdgeInsets.fromLTRB(12, 4, 12, 0),
        child: Row(
          children: [
            TextButton.icon(
              onPressed: sort.sortedCount == 0 ? null : sort.undoLastSort,
              icon: const Icon(Icons.undo, size: 18),
              label: const Text('Undo'),
            ),
            const Spacer(),
            Text(
              'Stage 1 · Initial Sort',
              style: text.labelMedium,
            ),
          ],
        ),
      ),
      child: Column(
        children: [
          Row(
            children: [
              Icon(Icons.bookmark_border, size: 18, color: colors.onSurfaceVariant),
              const SizedBox(width: 6),
              Expanded(
                child: Text(
                  '${sort.sortedCount} of ${sort.totalCount} values sorted',
                  style: text.labelMedium,
                ),
              ),
              Text(
                '${(sort.sortProgress * 100).round()}%',
                style: text.labelMedium?.copyWith(
                  color: colors.primary,
                  fontWeight: FontWeight.w700,
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          ClipRRect(
            borderRadius: BorderRadius.circular(999),
            child: LinearProgressIndicator(
              value: sort.sortProgress,
              minHeight: 6,
              backgroundColor: colors.surfaceContainerHigh,
              color: colors.secondary,
            ),
          ),
          const SizedBox(height: 12),
          Expanded(
            child: AnimatedSwitcher(
              duration: const Duration(milliseconds: 280),
              child: card == null
                  ? Center(
                      key: const ValueKey('empty'),
                      child: Text('All sorted', style: text.headlineMedium),
                    )
                  : SingleChildScrollView(
                      key: ValueKey(card.id),
                      child: Column(
                        children: [
                          ValueCardTile(card: card, elevation: 2),
                          const SizedBox(height: 14),
                          Text(
                            'Tap a pile to sort',
                            style: text.labelMedium?.copyWith(
                              color: colors.onSurfaceVariant,
                            ),
                          ),
                          const SizedBox(height: 8),
                          ...ValuePile.values.map((pile) {
                            return Padding(
                              padding: const EdgeInsets.only(bottom: 8),
                              child: _PileButton(
                                pile: pile,
                                count: sort.countInPile(pile),
                                onTap: () => sort.assignCurrent(pile),
                              ),
                            );
                          }),
                        ],
                      ),
                    ),
            ),
          ),
        ],
      ),
    );
  }
}

class _PileButton extends StatelessWidget {
  const _PileButton({
    required this.pile,
    required this.count,
    required this.onTap,
  });

  final ValuePile pile;
  final int count;
  final VoidCallback? onTap;

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

    return Material(
      color: colors.surfaceContainerLow,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(18),
        side: BorderSide(color: pile.accent.withValues(alpha: 0.35)),
      ),
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(18),
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
          child: Row(
            children: [
              Container(
                width: 28,
                height: 28,
                alignment: Alignment.center,
                decoration: BoxDecoration(
                  color: pile.accent.withValues(alpha: 0.15),
                  shape: BoxShape.circle,
                ),
                child: Text(
                  '${pile.rank}',
                  style: text.labelMedium?.copyWith(
                    color: pile.accent,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      pile.label,
                      style: text.titleMedium?.copyWith(
                        color: colors.onSurface,
                      ),
                    ),
                    Text(
                      pile.subtitle,
                      style: text.bodySmall?.copyWith(
                        color: colors.onSurfaceVariant,
                      ),
                    ),
                  ],
                ),
              ),
              Text(
                '$count',
                style: text.labelMedium?.copyWith(color: pile.accent),
              ),
            ],
          ),
        ),
      ),
    );
  }
}