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

import '../../../core/api/api_error_mapper.dart';
import '../../../core/l10n/l10n.dart';
import 'admin_ai_panel.dart';
import 'admin_aliases_panel.dart';
import 'admin_inventory_panel.dart';
import 'admin_pantry_panel.dart';
import 'admin_private_products_panel.dart';
import 'admin_pending_products_panel.dart';
import 'admin_products_panel.dart';
import '../../profile/data/profile_repository.dart';

enum _DatabaseTab { inventory, pantry, products, privateProducts, pending, aliases, ai }

class AdminDatabasePanel extends ConsumerStatefulWidget {
  final bool embedded;

  const AdminDatabasePanel({super.key, this.embedded = false});

  @override
  ConsumerState<AdminDatabasePanel> createState() => _AdminDatabasePanelState();
}

class _AdminDatabasePanelState extends ConsumerState<AdminDatabasePanel> {
  _DatabaseTab _activeTab = _DatabaseTab.inventory;
  bool _isRefreshingCategories = false;

  Future<void> _refreshCategories() async {
    setState(() => _isRefreshingCategories = true);
    try {
      await ref.read(profileRepositoryProvider).refreshCategories();
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Kategorier har uppdaterats.')),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context)),
      );
    } finally {
      if (mounted) setState(() => _isRefreshingCategories = false);
    }
  }

  Widget _sectionCard({
    required IconData icon,
    required String title,
    required String description,
    required VoidCallback onPressed,
    required String buttonLabel,
  }) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Icon(icon),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(title, style: Theme.of(context).textTheme.titleMedium),
                ),
              ],
            ),
            const SizedBox(height: 8),
            Text(description),
            const SizedBox(height: 16),
            FilledButton.icon(
              onPressed: onPressed,
              icon: Icon(icon),
              label: Text(buttonLabel),
            ),
          ],
        ),
      ),
    );
  }

  Widget _panelShell({
    required String title,
    required String description,
    required Widget child,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Card(
          child: Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(title, style: Theme.of(context).textTheme.titleMedium),
                const SizedBox(height: 8),
                Text(description),
              ],
            ),
          ),
        ),
        const SizedBox(height: 12),
        child,
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    String tabLabel(_DatabaseTab tab) {
      return switch (tab) {
        _DatabaseTab.inventory => context.l10n.profileInventoryTab,
        _DatabaseTab.pantry => context.l10n.profilePantryTab,
        _DatabaseTab.products => context.l10n.profileProductsTab,
        _DatabaseTab.privateProducts => 'Privata produkter',
        _DatabaseTab.pending => context.l10n.profilePendingTab,
        _DatabaseTab.aliases => 'Alias',
        _DatabaseTab.ai => 'AI',
      };
    }

    Widget activeSection;
    switch (_activeTab) {
      case _DatabaseTab.inventory:
        activeSection = _panelShell(
          title: context.l10n.profileInventoryTab,
          description: 'Granska, filtrera och redigera inventory-poster. Välj användare för att arbeta på en specifik ägares data.',
          child: const AdminInventoryPanel(embedded: true),
        );
      case _DatabaseTab.pantry:
        activeSection = _panelShell(
          title: context.l10n.profilePantryTab,
          description: 'Granska och redigera användarnas baslager. Flytta poster till inventarie eller ta bort dem vid behov.',
          child: const AdminPantryPanel(embedded: true),
        );
      case _DatabaseTab.products:
        activeSection = _panelShell(
          title: context.l10n.profileProductsTab,
          description: 'Hantera globala produkter: kategorisering, restaurering, merge och AI-stöd.',
          child: const AdminProductsPanel(embedded: true),
        );
      case _DatabaseTab.privateProducts:
        activeSection = _panelShell(
          title: 'Privata produkter',
          description: 'Promotera privata produkter till den globala produkt-tabellen.',
          child: const AdminPrivateProductsPanel(embedded: true),
        );
      case _DatabaseTab.pending:
        activeSection = _panelShell(
          title: context.l10n.profilePendingTab,
          description: 'Godkänn eller avslå nya produkter som föreslagits av användare.',
          child: const AdminPendingProductsPanel(embedded: true),
        );
      case _DatabaseTab.aliases:
        activeSection = _panelShell(
          title: 'Alias',
          description: 'Hantera globala alias som används i receipt-importens första matchningssteg.',
          child: const AdminAliasesPanel(embedded: true),
        );
      case _DatabaseTab.ai:
        activeSection = _panelShell(
          title: 'AI',
          description: 'Se vilka AI-modeller som används och hur de är exponerade i systemet.',
          child: const AdminAiPanel(embedded: true),
        );
    }

    final header = SingleChildScrollView(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('Databas', style: theme.textTheme.titleMedium),
                  const SizedBox(height: 8),
                  Text(
                    'Arbetsyta för data med tydlig scope: inventory och baslager är användarspecifika, produkter är globala eller privata och alias styr importmatchning.',
                    style: theme.textTheme.bodyMedium,
                  ),
                  const SizedBox(height: 8),
                  const Wrap(
                    spacing: 8,
                    runSpacing: 8,
                    children: [
                      Chip(label: Text('User-scope')),
                      Chip(label: Text('Global scope')),
                      Chip(label: Text('Private products')),
                      Chip(label: Text('Alias')),
                    ],
                  ),
                ],
              ),
            ),
          ),
          const SizedBox(height: 12),
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('Adminverktyg', style: theme.textTheme.titleMedium),
                  const SizedBox(height: 8),
                  Text('Uppdatera kategorier manuellt i backend-cachen.', style: theme.textTheme.bodyMedium),
                  const SizedBox(height: 12),
                  SizedBox(
                    width: double.infinity,
                    child: OutlinedButton.icon(
                      onPressed: _isRefreshingCategories ? null : _refreshCategories,
                      icon: _isRefreshingCategories
                          ? const SizedBox(
                              height: 16,
                              width: 16,
                              child: CircularProgressIndicator(strokeWidth: 2),
                            )
                          : const Icon(Icons.refresh),
                      label: const Text('Uppdatera kategorier'),
                    ),
                  ),
                ],
              ),
            ),
          ),
          const SizedBox(height: 12),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: _DatabaseTab.values
                  .map(
                    (tab) => Padding(
                      padding: const EdgeInsets.only(right: 8),
                      child: ChoiceChip(
                        label: Text(tabLabel(tab)),
                        selected: _activeTab == tab,
                        onSelected: (_) => setState(() => _activeTab = tab),
                      ),
                    ),
                  )
                  .toList(),
            ),
          ),
        ],
      ),
    );

    return Padding(
      padding: widget.embedded ? EdgeInsets.zero : const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Expanded(flex: 2, child: header),
          const SizedBox(height: 16),
          Expanded(flex: 5, child: activeSection),
        ],
      ),
    );
  }
}