using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using ComplianceNFs.Core.Entities;

namespace ComplianceNFs.Monitor
{
    public class MonitorViewModel : INotifyPropertyChanged
    {
        public ObservableCollection<EnergyInvoice> RecentInvoices { get; } = new();
        public ICommand ForceScanCommand { get; }

        public event PropertyChangedEventHandler PropertyChanged;

        public MonitorViewModel()
        {
            // TODO: Inject IInvoiceStatusStream and subscribe to updates
            ForceScanCommand = new RelayCommand(_ => ForceScan());
        }

        private void ForceScan()
        {
            // TODO: Call service to force ingestion cycle
        }

        protected void OnPropertyChanged([CallerMemberName] string name = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }
    }

    public class RelayCommand : ICommand
    {
        private readonly Action<object> _execute;
        private readonly Func<object, bool> _canExecute;
        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            _execute = execute;
            _canExecute = canExecute;
        }
        public bool CanExecute(object parameter) => _canExecute == null || _canExecute(parameter);
        public void Execute(object parameter) => _execute(parameter);
        public event EventHandler CanExecuteChanged { add { } remove { } }
    }
}