/// Log of saved shopping trips.
library;

import 'dart:io';

import 'package:flutter/material.dart';

import 'models/shop.dart';
import 'services/app_settings.dart';
import 'services/product_repository.dart';
import 'shop_detail_screen.dart';
import 'utils/dates.dart';
import 'utils/money.dart';
import 'widgets/confirm_dialog.dart';
import 'widgets/settings_button.dart';
import 'widgets/store_tag.dart';

class ShopLogScreen extends StatefulWidget {
  const ShopLogScreen({super.key, required this.repository});

  final ProductRepository repository;

  @override
  State<ShopLogScreen> createState() => _ShopLogScreenState();
}

class _ShopLogScreenState extends State<ShopLogScreen> {
  late Future<List<Shop>> _future;
  bool _editing = false;

  @override
  void initState() {
    super.initState();
    _future = widget.repository.getShops();
  }

  void _reload() {
    setState(() => _future = widget.repository.getShops());
  }

  Future<void> _openShop(Shop shop) async {
    await Navigator.of(context).push<void>(
      MaterialPageRoute(
        builder: (_) =>
            ShopDetailScreen(repository: widget.repository, shopId: shop.id),
      ),
    );
    if (mounted) _reload();
  }

  Future<void> _removeShop(Shop shop) async {
    final confirmed = await confirmAction(
      context,
      title: 'Remove shopping trip?',
      message: 'This trip will be removed from the shop log. Products from this trip stay in your catalog.',
    );
    if (!confirmed || !mounted) return;
    await widget.repository.deleteShop(shop.id);
    if (mounted) _reload();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final stores = SettingsScope.maybeOf(context)?.supermarkets ?? const [];

    return Scaffold(
      appBar: AppBar(
        title: const Text('Shop log'),
        actions: [
          IconButton(
            tooltip: _editing ? 'Done' : 'Edit',
            onPressed: () => setState(() => _editing = !_editing),
            icon: Icon(_editing ? Icons.check : Icons.edit_outlined),
          ),
          const SettingsButton(),
        ],
      ),
      body: FutureBuilder<List<Shop>>(
        future: _future,
        builder: (context, snapshot) {
          if (snapshot.hasError) {
            return Center(
              child: Text(
                'Could not load the shop log.',
                style: theme.textTheme.bodyLarge,
              ),
            );
          }
          if (!snapshot.hasData) {
            return const Center(child: CircularProgressIndicator());
          }

          final shops = snapshot.data!;
          if (shops.isEmpty) {
            return Center(
              child: Text(
                'Scan a receipt or enter a trip to log it.',
                textAlign: TextAlign.center,
                style: theme.textTheme.bodyLarge,
              ),
            );
          }

          return ListView.separated(
            padding: const EdgeInsets.fromLTRB(8, 8, 8, 16),
            itemCount: shops.length,
            separatorBuilder: (_, _) => const SizedBox(height: 4),
            itemBuilder: (context, index) {
              final shop = shops[index];
              final count = shop.itemCount;
              return ListTile(
                leading: _ReceiptThumb(path: shop.receiptImagePath),
                title: Align(
                  alignment: Alignment.centerLeft,
                  child: StoreTag(name: shop.supermarket, stores: stores),
                ),
                subtitle: Text(
                  [
                    formatDate(shop.shoppedAt),
                    count == 1 ? '1 product' : '$count products',
                  ].join(' · '),
                ),
                trailing: _editing
                    ? IconButton(
                        tooltip: 'Remove',
                        onPressed: () => _removeShop(shop),
                        icon: const Icon(Icons.delete_outline),
                      )
                    : Text(
                        formatEuro(shop.total),
                        style: theme.textTheme.titleMedium,
                      ),
                onTap: _editing ? null : () => _openShop(shop),
              );
            },
          );
        },
      ),
    );
  }
}

class _ReceiptThumb extends StatelessWidget {
  const _ReceiptThumb({this.path});

  final String? path;

  @override
  Widget build(BuildContext context) {
    final file = path == null ? null : File(path!);
    final hasFile = file != null && file.existsSync();
    final scheme = Theme.of(context).colorScheme;

    return ClipRRect(
      borderRadius: BorderRadius.circular(12),
      child: SizedBox(
        width: 48,
        height: 48,
        child: hasFile
            ? Image.file(
                file,
                fit: BoxFit.cover,
                cacheWidth: 144,
                errorBuilder: (_, _, _) => ColoredBox(
                  color: scheme.secondaryContainer,
                  child: Icon(
                    Icons.receipt_long_outlined,
                    color: scheme.onSecondaryContainer,
                  ),
                ),
              )
            : ColoredBox(
                color: scheme.secondaryContainer,
                child: Icon(
                  Icons.receipt_long_outlined,
                  color: scheme.onSecondaryContainer,
                ),
              ),
      ),
    );
  }
}