Add initial project structure with basic view models, views, and resources

2026-09-14 19:46:46 +03:00
commit 45401645c6
68 changed files with 2538 additions and 0 deletions
@@ -0,0 +1,131 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Globalization;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CryptoPortfolio_Tracker.Models;
+using LiveChartsCore;
+using LiveChartsCore.Defaults;
+using LiveChartsCore.SkiaSharpView;
+using LiveChartsCore.SkiaSharpView.Painting;
+using SkiaSharp;
+
+namespace CryptoPortfolio_Tracker.ViewModels;
+
+public partial class CryptoChartViewModel : ViewModelBase
+{
+    [ObservableProperty] public partial string CryptocurrencyName { get; set; } = null!;
+    [ObservableProperty] public partial decimal CurrentPrice { get; set; }
+    [ObservableProperty] public partial decimal PriceChangePercentage24H { get; set; }
+    [ObservableProperty] public partial decimal PriceChange24H { get; set; }
+    [ObservableProperty] public partial decimal? MarketCap { get; set; }
+    [ObservableProperty] public partial decimal? Volume24H { get; set; }
+    [ObservableProperty] public partial bool IsPositive { get; set; }
+    [ObservableProperty] public partial bool IsNegative { get; set; }
+    [ObservableProperty] public partial DateTime StartDate { get; set; }
+    [ObservableProperty] public partial DateTime EndDate { get; set; }
+
+    public ObservableCollection<DateTimePoint> PriceHistory7D { get; } = [];
+
+    public TimeSpan UnitWidth { get; } = TimeSpan.FromHours(1);
+
+    public Func<DateTime, string> DateFormatter { get; } =
+        date => date.ToString("dd.MM HH:mm");
+
+    public Func<double, string> PriceFormatter { get; } =
+        FormatPrice;
+
+    public SolidColorPaint GridPaint { get; } =
+        new(new SKColor(255, 255, 255, 25));
+
+    public SolidColorPaint ChartStroke { get; } =
+        new(new SKColor(0x3B, 0xB3, 0x46));
+
+    public ISeries[] Series { get; private set; } = [];
+
+    public CryptoChartViewModel(Cryptocurrency cryptocurrency)
+    {
+        CryptocurrencyName = cryptocurrency.Name;
+        CurrentPrice = cryptocurrency.CurrentPriceUsd;
+        PriceChangePercentage24H = cryptocurrency.PriceChangePercentage24H ?? 0;
+        PriceChange24H = cryptocurrency.PriceChange24H ?? 0;
+        MarketCap = cryptocurrency.MarketCapUsd;
+        Volume24H = cryptocurrency.Volume24HUsd;
+
+        IsPositive = cryptocurrency.PriceChangePercentage24H > 0;
+        IsNegative = cryptocurrency.PriceChangePercentage24H < 0;
+
+        foreach (var point in cryptocurrency.PriceHistory7D)
+        {
+            PriceHistory7D.Add(point);
+        }
+
+        if (PriceHistory7D.Count > 0)
+        {
+            StartDate = PriceHistory7D[0].DateTime;
+            EndDate = PriceHistory7D[^1].DateTime;
+        }
+
+        UpdateSeries();
+    }
+
+    partial void OnStartDateChanged(DateTime value)
+    {
+        UpdateSeries();
+    }
+
+    partial void OnEndDateChanged(DateTime value)
+    {
+        UpdateSeries();
+    }
+
+    private void UpdateSeries()
+    {
+        ObservableCollection<DateTimePoint> visiblePoints = [];
+
+        foreach (var point in PriceHistory7D)
+        {
+            if (point.DateTime >= StartDate &&
+                point.DateTime <= EndDate)
+            {
+                visiblePoints.Add(point);
+            }
+        }
+
+        if (visiblePoints.Count == 0)
+        {
+            Series = [];
+            OnPropertyChanged(nameof(Series));
+            return;
+        }
+
+        LineSeries<DateTimePoint> lineSeries =
+            new()
+            {
+                Values = visiblePoints,
+                GeometrySize = 0,
+                Fill = null,
+                GeometryFill = null,
+                GeometryStroke = null,
+                Stroke = ChartStroke,
+                LineSmoothness = 0.2
+            };
+
+        Series =
+        [
+            lineSeries
+        ];
+
+        OnPropertyChanged(nameof(Series));
+    }
+
+    private static string FormatPrice(double price)
+    {
+        return price switch
+        {
+            >= 1000 => price.ToString("N0", CultureInfo.InvariantCulture),
+            >= 1 => price.ToString("N2", CultureInfo.InvariantCulture),
+            >= 0.01 => price.ToString("N4", CultureInfo.InvariantCulture),
+            _ => price.ToString("0.########", CultureInfo.InvariantCulture)
+        };
+    }
+}