using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Input;
using DesktopBot.Engine;
using DesktopBot.Models;

namespace DesktopBot.ViewModels
{
    /// <summary>
    /// ViewModel per il Live Log
    /// </summary>
    public class LiveLogViewModel : BaseViewModel
    {
        private ObservableCollection<BotLogEntry> _logs = new ObservableCollection<BotLogEntry>();

        public ObservableCollection<BotLogEntry> Logs
        {
            get => _logs;
            set => SetProperty(ref _logs, value);
        }

        public ICommand ClearLogsCommand { get; }
        public ICommand CopyLogsCommand  { get; }

        public LiveLogViewModel(AutomatedBotEngine botEngine)
        {
            ClearLogsCommand = new RelayCommand(_ => Logs.Clear());
            CopyLogsCommand  = new RelayCommand(_ =>
            {
                if (Logs.Count == 0) return;
                var sb = new StringBuilder();
                // I log sono inseriti in testa (più recente prima): li copiamo in ordine cronologico
                foreach (var entry in Logs.Reverse())
                    sb.AppendLine(string.Format("[{0:HH:mm:ss dd/MM}] [{1}] {2}",
                        entry.Timestamp, entry.Level, entry.Message));
                Clipboard.SetText(sb.ToString());
            });
            AddLog(new BotLogEntry(LogLevel.Info, "Sistema avviato - in attesa di configurazione"));
        }

        /// <summary>
        /// Aggiunge un log entry in cima alla lista, sul UI thread (limiti parametrizzati)
        /// </summary>
        public void AddLog(BotLogEntry logEntry)
        {
            Application.Current?.Dispatcher.Invoke(() =>
            {
                Logs.Insert(0, logEntry);
                // Limite massimo per il live log (default 10000)
                int maxLiveLogEntries = 10000;
                while (Logs.Count > maxLiveLogEntries)
                    Logs.RemoveAt(Logs.Count - 1);
            });
        }
    }
}