import 'package:cdb_ui/api.dart';
import 'package:cdb_ui/pages/itemview.dart';
import 'package:flutter/material.dart';

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

  Future<(List<MinItem>, List<Transaction>, GlobalItemStat)>
      _fetchData() async {
    return (
      await API().getItemsUnderMin(),
      await API().getExpiredItems(),
      await API().getGlobalItemStat()
    );
  }

  @override
  Widget build(BuildContext context) {
    // todo : add global statistics
    // todo : demand stat
    // todo : stat on origin + destination
    // todo : add btn for scanning transaction

    return Scaffold(
      body: FutureBuilder(
        future: _fetchData(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return const CircularProgressIndicator();
          }

          var data = snapshot.data!;
          var min = data.$1;
          var expired = data.$2;
          var globalStat = data.$3;

          return Column(
            children: [
              Card(
                  child: Column(
                children: [
                  Text("Items: ${globalStat.item_count}"),
                  Text("Inventory: ${globalStat.total_transactions}"),
                  Text("Price: ${globalStat.total_price} €")
                ],
              )),

              if (min.isNotEmpty)
                const ListTile(title: Text("Items under Minimum")),
              ...min.map((item) {
                return ListTile(
                  title: Text(
                      "Item ${item.itemVariant} under minimum. Needs ${item.need} more."),
                );
              }).toList(),

              if (expired.isNotEmpty)
                const ListTile(title: Text("Expired Items")),

              // Mapping expired list to widgets
              ...expired.map((item) {
                return ListTile(
                  title: TransactionCard(item, () {}),
                );
              }).toList(),
            ],
          );
        },
      ),
    );
  }
}