using System;
using System.Reflection;
using System.Windows.Input;
using DesktopBot.Models;
using DesktopBot.Services;

namespace DesktopBot.ViewModels
{
    /// <summary>
    /// ViewModel per la schermata di configurazione credenziali Alpaca e logging
    /// </summary>
    public class SettingsViewModel : BaseViewModel
    {
        private readonly ITradingService _tradingService;
        private readonly Action<string, string, bool> _onCredentialsSaved;
        private readonly Action<LoggingConfiguration> _onLoggingConfigSaved;
        private LoggingSettingsViewModel _loggingSettings;

        private string _apiKey;
        private string _apiSecret;
        private bool _isPaper = true;
        private string _statusMessage;
        private bool _isConnecting;
        private bool _isConnected;

        public string ApiKey
        {
            get => _apiKey;
            set => SetProperty(ref _apiKey, value);
        }

        /// <summary>
        /// Il secret non è bindabile direttamente (PasswordBox non supporta binding).
        /// Viene impostato dal code-behind tramite questa proprietà.
        /// </summary>
        public string ApiSecret
        {
            get => _apiSecret;
            set => SetProperty(ref _apiSecret, value);
        }

        public bool IsPaper
        {
            get => _isPaper;
            set => SetProperty(ref _isPaper, value);
        }

        public string StatusMessage
        {
            get => _statusMessage;
            set => SetProperty(ref _statusMessage, value);
        }

        public bool IsConnecting
        {
            get => _isConnecting;
            set => SetProperty(ref _isConnecting, value);
        }

        public bool IsConnected
        {
            get => _isConnected;
            set => SetProperty(ref _isConnected, value);
        }

        /// <summary>ViewModel per la configurazione dei log</summary>
        public LoggingSettingsViewModel LoggingSettings
        {
            get => _loggingSettings;
            set => SetProperty(ref _loggingSettings, value);
        }

        public ICommand SaveCommand { get; }
        public ICommand TestConnectionCommand { get; }
        public ICommand DeleteCredentialsCommand { get; }
        public ICommand SaveLoggingCommand { get; }
        public ICommand ResetLoggingCommand { get; }

        // ── Informazioni applicazione ──────────────────────────────────────────
        public string AppVersion   { get; } = Assembly.GetExecutingAssembly()
                                                  .GetName().Version?.ToString() ?? "1.0.0.0";
        public string BuildDate    { get; } = System.IO.File.GetLastWriteTime(
                                                  Assembly.GetExecutingAssembly().Location)
                                                  .ToString("dd/MM/yyyy HH:mm");
        public string Author       { get; } = "Alberto Balbo";
        public string Framework    { get; } = ".NET Framework 4.8.1";
        public string Description  { get; } = "Trading Bot automatico per Alpaca Markets API v2. " +
                                              "Supporta paper trading e live trading con strategia EMA Crossover + RSI.";

        public SettingsViewModel(ITradingService tradingService, 
                                Action<string, string, bool> onCredentialsSaved,
                                Action<LoggingConfiguration> onLoggingConfigSaved = null)
        {
            _tradingService = tradingService;
            _onCredentialsSaved = onCredentialsSaved;
            _onLoggingConfigSaved = onLoggingConfigSaved;

            SaveCommand = new RelayCommand(
                _ => SaveCredentials(),
                _ => !string.IsNullOrWhiteSpace(ApiKey) && !string.IsNullOrWhiteSpace(ApiSecret)
            );

            TestConnectionCommand = new RelayCommand(
                async _ => await TestConnectionAsync(),
                _ => !string.IsNullOrWhiteSpace(ApiKey) && !string.IsNullOrWhiteSpace(ApiSecret) && !IsConnecting
            );

            DeleteCredentialsCommand = new RelayCommand(_ => DeleteCredentials());

            SaveLoggingCommand = new RelayCommand(_ => SaveLoggingConfiguration());
            ResetLoggingCommand = new RelayCommand(_ => ResetLoggingConfiguration());

            // Carica credenziali esistenti (mostra solo la key, non il secret)
            var saved = CredentialService.LoadCredentials();
            if (saved != null)
            {
                ApiKey = saved.ApiKey;
                ApiSecret = saved.ApiSecret;
                IsPaper = saved.IsPaper;
                StatusMessage = "✓ Credenziali caricate da configurazione salvata";
                IsConnected = true;
            }
            else
            {
                StatusMessage = "Inserisci le credenziali API di Alpaca";
            }

            // Inizializza logging settings con configurazione di default
            LoggingSettings = new LoggingSettingsViewModel(new LoggingConfiguration());
        }

        /// <summary>
        /// Imposta la configurazione di logging iniziale dal bot
        /// </summary>
        public void SetLoggingConfiguration(LoggingConfiguration config)
        {
            LoggingSettings = new LoggingSettingsViewModel(config);
        }

        /// <summary>
        /// Salva la configurazione di logging
        /// </summary>
        private void SaveLoggingConfiguration()
        {
            var updatedConfig = LoggingSettings.GetUpdatedConfig();
            _onLoggingConfigSaved?.Invoke(updatedConfig);
            StatusMessage = "✓ Configurazione log salvata";
        }

        /// <summary>
        /// Ripristina i limiti di logging ai valori di default
        /// </summary>
        private void ResetLoggingConfiguration()
        {
            LoggingSettings.ResetToDefaults();
            StatusMessage = "✓ Limiti log ripristinati ai valori di default";
        }

        /// <summary>
        /// Salva le credenziali cifrate e notifica il ViewModel principale
        /// </summary>
        private void SaveCredentials()
        {
            if (string.IsNullOrWhiteSpace(ApiKey) || string.IsNullOrWhiteSpace(ApiSecret))
            {
                StatusMessage = "⚠ API Key e Secret sono obbligatori";
                return;
            }

            try
            {
                CredentialService.SaveCredentials(ApiKey, ApiSecret, IsPaper);
                _tradingService.Initialize(ApiKey, ApiSecret, IsPaper);
                _onCredentialsSaved?.Invoke(ApiKey, ApiSecret, IsPaper);
                StatusMessage = "✓ Credenziali salvate e connessione configurata";
                IsConnected = true;
            }
            catch (Exception ex)
            {
                StatusMessage = $"✗ Errore nel salvataggio: {ex.Message}";
            }
        }

        /// <summary>
        /// Testa la connessione alle API Alpaca con le credenziali inserite
        /// </summary>
        private async System.Threading.Tasks.Task TestConnectionAsync()
        {
            IsConnecting = true;
            IsConnected = false;
            StatusMessage = "⟳ Test connessione in corso...";

            try
            {
                _tradingService.Initialize(ApiKey, ApiSecret, IsPaper);
                var equity = await _tradingService.GetAvailableEquityAsync();
                StatusMessage = $"✓ Connessione riuscita! Equity disponibile: ${equity:N2}";
                IsConnected = true;
            }
            catch (Exception ex)
            {
                StatusMessage = $"✗ Connessione fallita: {ex.Message}";
                IsConnected = false;
            }
            finally
            {
                IsConnecting = false;
            }
        }

        /// <summary>
        /// Elimina le credenziali salvate
        /// </summary>
        private void DeleteCredentials()
        {
            CredentialService.DeleteCredentials();
            ApiKey = string.Empty;
            ApiSecret = string.Empty;
            IsConnected = false;
            StatusMessage = "Credenziali eliminate. Inserisci nuove credenziali.";
        }
    }
}