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

import '../../l10n/app_localizations.dart';
import '../../models/bar_tab.dart';
import '../../models/tab_item_purchase.dart';

class OpenTabHistoryCard extends StatefulWidget {
  final BarTab tab;

  const OpenTabHistoryCard({super.key, required this.tab});

  @override
  State<OpenTabHistoryCard> createState() => _OpenTabHistoryCardState();
}

class _OpenTabHistoryCardState extends State<OpenTabHistoryCard> {
  bool _expanded = false;

  List<_OpenPurchase> _purchases(BarTab tab) {
    final purchases = <_OpenPurchase>[];

    for (final item in tab.items) {
      final records = item.purchases.isEmpty
          ? List<TabItemPurchase>.generate(
              item.quantity,
              (index) => TabItemPurchase(
                id: '${item.id}-$index',
                tabItemId: item.id,
                purchasedAt: tab.openedAt,
              ),
            )
          : item.purchases;

      purchases.addAll(
        records.map(
          (purchase) => _OpenPurchase(
            productName: item.productName,
            unitPriceInCents: item.unitPriceInCents,
            purchasedAt: purchase.purchasedAt,
            isRemoved: purchase.isRemoved,
          ),
        ),
      );
    }

    purchases.sort((a, b) {
      final byTime = b.purchasedAt.compareTo(a.purchasedAt);
      if (byTime != 0) return byTime;

      return b.productName.compareTo(a.productName);
    });
    return purchases;
  }

  @override
  Widget build(BuildContext context) {
    final tab = widget.tab;
    final l10n = AppLocalizations.of(context);
    final locale = Localizations.localeOf(context).toLanguageTag();
    final dateFormat = DateFormat.yMMMd(locale).add_jm();
    final scheme = Theme.of(context).colorScheme;

    return Container(
      decoration: BoxDecoration(
        color: scheme.primary.withValues(alpha: 0.06),
        borderRadius: BorderRadius.circular(14),
        border: Border.all(color: scheme.primary.withValues(alpha: 0.2)),
      ),
      clipBehavior: Clip.antiAlias,
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: () => setState(() => _expanded = !_expanded),
          enableFeedback: true,
          splashFactory: NoSplash.splashFactory,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: 16,
                  vertical: 14,
                ),
                child: Row(
                  children: [
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Row(
                            children: [
                              Expanded(
                                child: Text(
                                  tab.customerName,
                                  maxLines: 1,
                                  overflow: TextOverflow.ellipsis,
                                  style: TextStyle(
                                    fontSize: 16,
                                    fontWeight: FontWeight.w800,
                                    color: scheme.onSurface,
                                  ),
                                ),
                              ),
                              const SizedBox(width: 8),
                              Container(
                                padding: const EdgeInsets.symmetric(
                                  horizontal: 8,
                                  vertical: 3,
                                ),
                                decoration: BoxDecoration(
                                  color: scheme.primary.withValues(alpha: 0.12),
                                  borderRadius: BorderRadius.circular(999),
                                ),
                                child: Text(
                                  l10n.openTabs,
                                  style: TextStyle(
                                    fontSize: 11,
                                    fontWeight: FontWeight.w700,
                                    color: scheme.primary,
                                  ),
                                ),
                              ),
                            ],
                          ),
                          const SizedBox(height: 2),
                          Text(
                            '${dateFormat.format(tab.openedAt)} · ${l10n.tabItemCount(tab.itemCount)}',
                            style: Theme.of(context).textTheme.bodySmall,
                          ),
                        ],
                      ),
                    ),
                    const SizedBox(width: 8),
                    Text(
                      tab.formattedTotal,
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w800,
                        color: scheme.onSurface,
                      ),
                    ),
                    const SizedBox(width: 4),
                    Icon(
                      _expanded
                          ? Icons.expand_less_rounded
                          : Icons.expand_more_rounded,
                      color: scheme.onSurface.withValues(alpha: 0.5),
                    ),
                  ],
                ),
              ),
              AnimatedCrossFade(
                duration: const Duration(milliseconds: 150),
                crossFadeState: _expanded
                    ? CrossFadeState.showFirst
                    : CrossFadeState.showSecond,
                firstChild: Padding(
                  padding: const EdgeInsets.fromLTRB(16, 0, 16, 14),
                  child: Column(
                    children: [
                      const Divider(height: 1),
                      const SizedBox(height: 8),
                      ..._purchases(
                        tab,
                      ).map((purchase) => _OpenPurchaseRow(purchase: purchase)),
                    ],
                  ),
                ),
                secondChild: const SizedBox(width: double.infinity),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _OpenPurchase {
  final String productName;
  final int unitPriceInCents;
  final DateTime purchasedAt;
  final bool isRemoved;

  const _OpenPurchase({
    required this.productName,
    required this.unitPriceInCents,
    required this.purchasedAt,
    required this.isRemoved,
  });
}

class _OpenPurchaseRow extends StatelessWidget {
  final _OpenPurchase purchase;

  const _OpenPurchaseRow({required this.purchase});

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final locale = Localizations.localeOf(context).toLanguageTag();
    final dateFormat = DateFormat.yMMMd(locale).add_jm();
    final unitPrice = NumberFormat.simpleCurrency(
      locale: locale,
    ).format(purchase.unitPriceInCents / 100);
    final scheme = Theme.of(context).colorScheme;

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  purchase.productName,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                    fontWeight: FontWeight.w600,
                    color: purchase.isRemoved
                        ? scheme.onSurface.withValues(alpha: 0.5)
                        : scheme.onSurface,
                    decoration: purchase.isRemoved
                        ? TextDecoration.lineThrough
                        : null,
                  ),
                ),
                Text(
                  dateFormat.format(purchase.purchasedAt),
                  style: Theme.of(context).textTheme.bodySmall,
                ),
              ],
            ),
          ),
          if (purchase.isRemoved)
            Text(
              l10n.removed,
              style: TextStyle(
                color: scheme.error,
                fontSize: 12,
                fontWeight: FontWeight.w700,
              ),
            )
          else
            Text(
              '1 × $unitPrice',
              style: Theme.of(context).textTheme.bodySmall,
            ),
        ],
      ),
    );
  }
}