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

import '../../../app/providers.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/theme/app_dimens.dart';
import '../../../core/utils/formatters.dart';
import '../../../core/widgets/status_pill.dart';
import '../../../domain/entities/customer.dart';
import '../../customer/widgets/customer_capture_sheet.dart';
import '../widgets/module_widgets.dart';

/// Full customer book, independent of the six shown during billing.
final allCustomersProvider = FutureProvider<List<Customer>>(
  (ref) => ref.watch(customerRepositoryProvider).recent(limit: 200),
);

class CustomersView extends ConsumerStatefulWidget {
  const CustomersView({super.key});

  @override
  ConsumerState<CustomersView> createState() => _CustomersViewState();
}

class _CustomersViewState extends ConsumerState<CustomersView> {
  String _query = '';
  MembershipTier? _tier;

  Color _tierColor(MembershipTier t) => switch (t) {
        MembershipTier.bronze => AppColors.tierBronze,
        MembershipTier.silver => AppColors.tierSilver,
        MembershipTier.gold => AppColors.tierGold,
        MembershipTier.platinum => AppColors.tierPlatinum,
      };

  @override
  Widget build(BuildContext context) {
    final all = ref.watch(allCustomersProvider).value ?? const <Customer>[];

    final filtered = all.where((c) {
      final q = _query.trim().toLowerCase();
      final matchesQuery = q.isEmpty ||
          c.name.toLowerCase().contains(q) ||
          c.mobile.contains(q);
      return matchesQuery && (_tier == null || c.tier == _tier);
    }).toList();

    final lifetime = all.fold<double>(0, (s, c) => s + c.lifetimeSpend);
    final points = all.fold<int>(0, (s, c) => s + c.loyaltyPoints);

    return ModulePage(
      children: [
        Wrap(
          spacing: AppSpacing.lg,
          runSpacing: AppSpacing.lg,
          children: [
            StatTile(
              label: 'Total Customers',
              value: '${all.length}',
              icon: Icons.people_alt_rounded,
              caption: 'registered',
            ),
            StatTile(
              label: 'Lifetime Value',
              value: Formatters.moneyCompact(lifetime),
              icon: Icons.payments_rounded,
              color: AppColors.success,
              caption: 'all customers',
            ),
            StatTile(
              label: 'Points Outstanding',
              value: '$points',
              icon: Icons.stars_rounded,
              color: AppColors.tierGold,
              caption: 'worth ${Formatters.money(points * 0.25)}',
            ),
            StatTile(
              label: 'Avg Spend',
              value: Formatters.money(all.isEmpty ? 0 : lifetime / all.length),
              icon: Icons.trending_up_rounded,
              color: AppColors.info,
              caption: 'per customer',
            ),
          ],
        ),
        const SizedBox(height: AppSpacing.lg),

        PanelCard(
          title: 'Tier distribution',
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              for (final t in MembershipTier.values)
                ProgressRow(
                  label: '${t.label}  ·  '
                      '${(t.discountRate * 100).toStringAsFixed(0)}% off',
                  value: '${all.where((c) => c.tier == t).length}',
                  fraction: all.isEmpty
                      ? 0
                      : all.where((c) => c.tier == t).length / all.length,
                  color: _tierColor(t),
                ),
            ],
          ),
        ),
        const SizedBox(height: AppSpacing.lg),

        PanelCard(
          title: 'Customer book',
          subtitle: '${filtered.length} shown',
          action: FilledButton.icon(
            // Reuses the sheet the till already opens at checkout, so a
            // customer added here is validated the same way — including the
            // duplicate-mobile guard.
            onPressed: () async {
              await showCustomerCaptureSheet(context);
              ref.invalidate(allCustomersProvider);
            },
            icon: const Icon(Icons.person_add_alt_1_rounded, size: 17),
            label: const Text('Add customer'),
            style: FilledButton.styleFrom(
              backgroundColor: AppColors.primary,
              minimumSize: const Size(0, 40),
            ),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              TextField(
                onChanged: (v) => setState(() => _query = v),
                decoration: const InputDecoration(
                  hintText: 'Search by name or mobile number…',
                  prefixIcon: Icon(Icons.search_rounded),
                  isDense: true,
                ),
              ),
              const SizedBox(height: AppSpacing.md),
              Wrap(
                spacing: AppSpacing.sm,
                runSpacing: AppSpacing.sm,
                children: [
                  ChoiceChip(
                    label: const Text('All tiers'),
                    selected: _tier == null,
                    onSelected: (_) => setState(() => _tier = null),
                    labelStyle: TextStyle(
                      fontSize: 12.5,
                      fontWeight: FontWeight.w600,
                      color: _tier == null
                          ? Colors.white
                          : AppColors.textSecondary,
                    ),
                  ),
                  for (final t in MembershipTier.values)
                    ChoiceChip(
                      label: Text(t.label),
                      selected: _tier == t,
                      onSelected: (_) =>
                          setState(() => _tier = _tier == t ? null : t),
                      labelStyle: TextStyle(
                        fontSize: 12.5,
                        fontWeight: FontWeight.w600,
                        color: _tier == t
                            ? Colors.white
                            : AppColors.textSecondary,
                      ),
                    ),
                ],
              ),
              const SizedBox(height: AppSpacing.lg),
              ResponsiveTable(
                columns: const [
                  TableCol('Customer', flex: 4),
                  TableCol('Mobile', flex: 3, priority: 1),
                  TableCol('Tier', flex: 2),
                  TableCol('Points', flex: 2, numeric: true, priority: 1),
                  TableCol('Lifetime', flex: 2, numeric: true),
                  TableCol('Visits', flex: 2, numeric: true, priority: 1),
                ],
                rows: filtered
                    .map((c) => [
                          Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              CircleAvatar(
                                radius: 14,
                                backgroundColor: AppColors.primarySurface,
                                child: Text(
                                  Formatters.initials(c.name),
                                  style: const TextStyle(
                                    fontSize: 10.5,
                                    fontWeight: FontWeight.w700,
                                    color: AppColors.primary,
                                  ),
                                ),
                              ),
                              const SizedBox(width: AppSpacing.sm),
                              Flexible(child: Cell(c.name, bold: true)),
                            ],
                          ),
                          Cell(Formatters.mobile(c.mobile), mono: true),
                          StatusPill.tier(c.tier, dense: true),
                          Cell('${c.loyaltyPoints}', mono: true),
                          Cell(Formatters.moneyCompact(c.lifetimeSpend),
                              mono: true, bold: true,),
                          Cell('${c.visitCount}', mono: true),
                        ],)
                    .toList(),
              ),
            ],
          ),
        ),
      ],
    );
  }
}