import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/storage_model.dart';
import 'package:fcs/pages/storage/inventory_item.dart';
import 'package:fcs/pages/util.dart';
import 'package:fcs/theme/theme.dart';
import 'package:fcs/vo/inventory_line.dart';
import 'package:fcs/vo/inventory_taking.dart';
import 'package:fcs/widget/local_text.dart';
import 'package:fcs/widget/my_data_table.dart';
import 'package:fcs/widget/progress.dart';

class TakeInventory extends StatefulWidget {
  @override
  _TakeInventoryState createState() => _TakeInventoryState();
}

class _TakeInventoryState extends State<TakeInventory> {
  InventoryTaking inventoryTaking = InventoryTaking();
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    var _storages = Provider.of<StorageModel>(context, listen: false).storages;
    _storages.forEach((s) {
      s.products.forEach((p) {
        inventoryTaking.inventoryLines.add(InventoryLine(
            productID: p.id,
            productName: p.name,
            storageID: p.storageID,
            storageName: p.storageName,
            oldQty: p.quantity,
            quantity: p.quantity));
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
          appBar: AppBar(
            backgroundColor: primaryColor,
            title: LocalText(
              context,
              'inventory.take',
              fontSize: 20,
              color: Colors.white,
            ),
            actions: <Widget>[
              IconButton(
                icon: Icon(Icons.send),
                onPressed: () {
                  showConfirmDialog(context, "inventory.confirm", () {
                    _submit();
                  });
                },
              )
            ],
          ),
          floatingActionButton: FloatingActionButton(
            backgroundColor: primaryColor,
            child: Icon(Icons.add),
            onPressed: () async {
              final InventoryLine inventoryLine =
                  await Navigator.push<InventoryLine>(
                context,
                MaterialPageRoute(builder: (context) => InventoryItem()),
              );
              _save(inventoryLine);
            },
          ),
          body: SingleChildScrollView(
            scrollDirection: Axis.vertical,
            child: SingleChildScrollView(
              scrollDirection: Axis.horizontal,
              child: MyDataTable(
                columns: [
                  MyDataColumn(
                      label: LocalText(context, "inventory.product")),
                  MyDataColumn(
                      label: LocalText(context, "inventory.storage")),
                  MyDataColumn(
                    label: LocalText(context, "inventory.old.qty"),
                  ),
                  MyDataColumn(
                    label: LocalText(context, "inventory.new.qty"),
                  ),
                ],
                rows: getInventoryTable(inventoryTaking.inventoryLines),
              ),
            ),
          )),
    );
  }

  List<MyDataRow> getInventoryTable(List<InventoryLine> invLines) {
    return invLines.map((p) {
      return MyDataRow(
        onSelectChanged: (bool selected) async {
          var inventoryLine = await Navigator.push(
            context,
            MaterialPageRoute(
                builder: (context) => InventoryItem(
                      inventoryLine: p,
                    )),
          );
          _save(inventoryLine);
        },
        cells: [
          MyDataCell(
            new Text(
              p.productName,
              style: textStyle,
            ),
          ),
          MyDataCell(
            new Text(p.storageName.toString(), style: textStyle),
          ),
          MyDataCell(
            new Text(p.oldQty.toString(), style: textStyle),
          ),
          MyDataCell(
            new Text(p.quantity.toString(), style: textStyle),
          ),
        ],
      );
    }).toList();
  }

  _save(InventoryLine inventoryLine) {
    if (inventoryLine == null) return;
    if (inventoryLine.action == "create") {
      if (inventoryTaking.inventoryLines.contains(inventoryLine)) {
        showMsgDialog(context, "Error", "Duplicate line");
        return;
      }
      inventoryTaking.inventoryLines.add(inventoryLine);
    } else if (inventoryLine.action == "delete") {
      inventoryTaking.inventoryLines.remove(inventoryLine);
    }
  }

  _submit() async {
    if (inventoryTaking.inventoryLines.length == 0) {
      showMsgDialog(context, "Error", "No inventory line");
      return;
    }
    setState(() {
      _isLoading = true;
    });
    try {
      StorageModel storageModel = Provider.of<StorageModel>(context);
      await storageModel.createInventoryTaking(inventoryTaking);
      Navigator.pop(context);
    } catch (e) {
      showMsgDialog(context, "Error", e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }
}