108 lines
4.9 KiB
C#
108 lines
4.9 KiB
C#
using System;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Linq;
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using System.Reactive;
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using System.Reactive.Linq;
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using PcgsInvUi.Models;
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using PcgsInvUi.Services;
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using ReactiveUI;
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namespace PcgsInvUi.ViewModels;
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// TODO Error handling.
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// TODO Manual handling of API key.
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// TODO Use CoinFacts link.
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// TODO Splash screen during startup.
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// TODO Take giant sheet of coins to integrate into the application.
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// TODO Update all coins. Choose those that are older first.
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// TODO API request tracker (1000 per day)
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// TODO Ok button greys out while request is happening.
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// TODO Track when coins were last updated.
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// TODO Image for coin in notes view.
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public class MainWindowViewModel : ViewModelBase {
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public ViewModelBase SidebarContent {
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get => _sideContent;
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private set => this.RaiseAndSetIfChanged(ref _sideContent, value);
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}
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public ObservableCollection<Coin> CoinCollection { get; set; }
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public ObservableCollection<Coin> DisplayedList { get; set; }
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public CoinDatabase ConnectedCoinDatabase { get; set; }
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public Coin? SelectedCoin {
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get => _selectedCoin;
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set => this.RaiseAndSetIfChanged(ref _selectedCoin, value);
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}
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public double TotalValue {
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get => _totalValue;
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set => this.RaiseAndSetIfChanged(ref _totalValue, value);
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}
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public ReactiveCommand<Unit, Unit> DeleteCommand { get; }
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public Interaction<DeleteWindowViewModel, Boolean> ShowDeleteWindow { get; }
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public ReactiveCommand<Unit, Unit> ExportCommand { get; }
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public Interaction<Unit, Uri> ShowExportWindow { get; }
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private ViewModelBase _sideContent;
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private Coin? _selectedCoin;
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private double _totalValue;
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private PcgsClient _pcgsClient;
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public MainWindowViewModel(CoinDatabase coins) {
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ConnectedCoinDatabase = coins;
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var newViewModel = new NewViewModel();
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_sideContent = newViewModel;
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// DisplayedList = CoinCollection = new ObservableCollection<Coin>(coins.GetItems());
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DisplayedList = CoinCollection =
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new ObservableCollection<Coin>(coins.GetCollection("CollectionTable"));
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TotalValue = DisplayedList.Sum(x => x.TotalPrice);
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_pcgsClient = new PcgsClient(
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"eAb8gS0I2XAvT_5gJeiGJaglMia1Tk-oB4kJUK6kuafyrny_S61vIJY-Ikl4nCQM67wrdxzUqLVWTV2kBSxD3d5XNBHxHnYBhcSS6dOPug0hZaF3qAv56df3gYSzOGh9Tif5y0eP3Iw0LrqKDr1Hj-dk6SV6GKog2IIqCPQhhHH8FMTWBTYO-_O8cx7qLdM5GM8KlTsic6g3VRUhM8EA_4OO04dCfmNLGhqINRl3jGZ0Q4ziI8fng2bVWsIyteqiPzUn10rIQ3-OPpqVZG_DxeOmOejj4GzbUNyqUOajy-nr5rYY");
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// Set up the ability to open the delete window.
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ShowDeleteWindow = new Interaction<DeleteWindowViewModel, bool>();
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var deleteEnabled = this.WhenAnyValue(x => x.SelectedCoin)
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.Select(x => x != null);
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DeleteCommand = ReactiveCommand.CreateFromTask(async () => {
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var deleteViewModel = new DeleteWindowViewModel();
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var result = await ShowDeleteWindow.Handle(deleteViewModel);
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if (result && SelectedCoin is not null) {
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ConnectedCoinDatabase.DeleteCoin(SelectedCoin);
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CoinCollection.Remove(SelectedCoin); // possible null deref - ignored due to button being disabled.
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}
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}, deleteEnabled);
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ShowExportWindow = new Interaction<Unit, Uri>();
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ExportCommand = ReactiveCommand.CreateFromTask(async () => {
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try {
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var filePath = await ShowExportWindow.Handle(Unit.Default);
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var stream = File.Open(filePath.AbsolutePath, FileMode.OpenOrCreate);
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var writer = new StreamWriter(stream);
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await writer.WriteAsync(ConnectedCoinDatabase.CollectionToCSV("CollectionTable"));
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await writer.FlushAsync();
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}
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catch (IOException e) {
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// Something is wrong with the file after it's been created.
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Console.WriteLine(e.Message);
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} catch (Exception e) {
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Console.WriteLine(e.Message);
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}
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});
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// Subscribe to SidebarContent.OkCommand, which is an IObservable<(int, string, int)>
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// This is the same as the above, but with a different syntax.
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newViewModel.OkCommand
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.Subscribe(async requestStructure => {
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var newCoin = await _pcgsClient.GetCoinFactsByGrade(requestStructure.Item1, requestStructure.Item2);
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newCoin.Quantity = requestStructure.Item3;
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CoinCollection.Add(newCoin);
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coins.InsertCoin(newCoin);
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TotalValue += newCoin.Quantity * newCoin.PriceGuideValue;
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});
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// Change TotalValue anytime SelectedCoin.TotalPrice changes.
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// Possible null deref - ignored due to null values summing to 0.
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this.WhenAnyValue(x => x.SelectedCoin.TotalPrice)
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.Subscribe(_ => TotalValue = CoinCollection.Sum(x => x.TotalPrice));
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}
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} |