ulapp/FieldLogger/ViewModels/JobDetailViewModel.cs

using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using FieldLogger.Models;
using FieldLogger.Services.Data;

namespace FieldLogger.ViewModels;

[QueryProperty(nameof(JobId), "jobId")]
public sealed partial class JobDetailViewModel : ObservableObject
{
    private readonly AppDatabase _database;

    [ObservableProperty]
    private int _jobId;

    [ObservableProperty]
    private string _jobName = "";

    [ObservableProperty]
    private int _pointCount;

    public ObservableCollection<LoggedPoint> Points { get; } = new();

    public JobDetailViewModel(AppDatabase database)
    {
        _database = database;
    }

    public async Task RefreshAsync()
    {
        var job = await _database.GetJobAsync(JobId);
        if (job is null)
            return;

        JobName = job.Name;
        var points = await _database.GetPointsAsync(JobId);
        PointCount = points.Count;
        Points.Clear();
        foreach (var p in points)
            Points.Add(p);
    }

    [RelayCommand]
    private Task ViewMapAsync() => Shell.Current.GoToAsync($"//map?jobId={JobId}");

    [RelayCommand]
    private async Task DeletePointAsync(LoggedPoint point)
    {
        var confirmed = await Shell.Current.DisplayAlert("Delete Point",
            $"Delete point #{point.Id} logged {point.TimestampUtc.ToLocalTime():g}?", "Delete", "Cancel");
        if (!confirmed)
            return;

        await _database.DeletePointAsync(point.Id);
        Points.Remove(point);
        PointCount = Points.Count;
    }
}