import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:prasule/api/category.dart';
import 'package:prasule/api/entry.dart';
import 'package:prasule/api/wallet.dart';
import 'package:prasule/api/walletmanager.dart';
import 'package:prasule/pw/platformbutton.dart';
import 'package:prasule/pw/platformfield.dart';

class CreateEntryView extends StatefulWidget {
  final Wallet w;
  final WalletEntry? editEntry;
  const CreateEntryView({super.key, required this.w, this.editEntry});

  @override
  State<CreateEntryView> createState() => _CreateEntryViewState();
}

class _CreateEntryViewState extends State<CreateEntryView> {
  late WalletEntry newEntry;
  @override
  void initState() {
    super.initState();
    if (widget.editEntry != null) {
      newEntry = widget.editEntry!;
    } else {
      var id = 1;
      while (widget.w.entries.where((element) => element.id == id).isNotEmpty) {
        id++; // create unique ID
      }
      newEntry = WalletEntry(
          id: id,
          name: "",
          amount: 0,
          type: EntryType.expense,
          date: DateTime.now(),
          category: widget.w.categories.first);
    }
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Create new entry"),
      ),
      body: SizedBox(
        width: MediaQuery.of(context).size.width,
        height: MediaQuery.of(context).size.height,
        child: Center(
          child: SingleChildScrollView(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.8,
                  child: PlatformField(
                    labelText: "Name",
                    controller: TextEditingController(text: newEntry.name),
                    onChanged: (v) {
                      newEntry.name = v;
                    },
                  ),
                ),
                const SizedBox(
                  height: 15,
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.8,
                  child: PlatformField(
                    labelText: "Amount",
                    controller:
                        TextEditingController(text: newEntry.amount.toString()),
                    keyboardType:
                        const TextInputType.numberWithOptions(decimal: true),
                    inputFormatters: [
                      FilteringTextInputFormatter.allow(
                          RegExp(r'\d+[\.,]{0,1}\d{0,}'))
                    ],
                    onChanged: (v) {
                      newEntry.amount = double.parse(v);
                    },
                  ),
                ),
                const SizedBox(
                  height: 20,
                ),
                const Text("Type"),
                const SizedBox(
                  height: 10,
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.8,
                  child: DropdownButton<EntryType>(
                    value: newEntry.type,
                    items: [
                      DropdownMenuItem(
                        value: EntryType.expense,
                        child: SizedBox(
                          width: MediaQuery.of(context).size.width * 0.8 - 24,
                          child: const Text(
                            "Expense",
                          ),
                        ),
                      ),
                      DropdownMenuItem(
                        value: EntryType.income,
                        child: SizedBox(
                          width: MediaQuery.of(context).size.width * 0.8 - 24,
                          child: const Text("Income"),
                        ),
                      ),
                    ],
                    onChanged: (v) {
                      if (v == null) return;
                      newEntry.type = v;
                      setState(() {});
                    },
                  ),
                ),
                const SizedBox(
                  height: 20,
                ),
                const Text("Category"),
                const SizedBox(
                  height: 10,
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.8,
                  child: DropdownButton<int>(
                    value: newEntry.category.id,
                    items: List.generate(
                      widget.w.categories.length,
                      (index) => DropdownMenuItem(
                        value: widget.w.categories[index].id,
                        child: SizedBox(
                          width: MediaQuery.of(context).size.width * 0.8 - 24,
                          child: Text(
                            widget.w.categories[index].name,
                          ),
                        ),
                      ),
                    ),
                    onChanged: (v) {
                      if (v == null) return;
                      newEntry.category = widget.w.categories
                          .where((element) => element.id == v)
                          .first;
                      setState(() {});
                    },
                  ),
                ),
                const SizedBox(
                  height: 15,
                ),
                PlatformButton(
                  text: "Save",
                  onPressed: () {
                    if (newEntry.name.isEmpty) {
                      ScaffoldMessenger.of(context).clearSnackBars();
                      ScaffoldMessenger.of(context).showSnackBar(
                        const SnackBar(
                          content: Text("Name cannot be empty"),
                        ),
                      );
                      return;
                    }
                    if (widget.editEntry != null) {
                      Navigator.of(context).pop(newEntry);
                      return;
                    }
                    widget.w.entries.add(newEntry);
                    WalletManager.saveWallet(widget.w).then((value) =>
                        Navigator.of(context)
                            .pop(widget.w)); // TODO loading circle?
                  },
                )
              ],
            ),
          ),
        ),
      ),
    );
  }
}