using System;
using System.Globalization;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using AutoBidder.Utilities;

namespace AutoBidder.Controls
{
    /// <summary>
    /// Scheda Esporta: sceglie quali aste finiscono in un unico file e lo scrive.
    ///
    /// <para>Come gli altri pannelli non conosce gli archivi: costruisce un
    /// <see cref="AuctionExportFilter"/> e lascia il lavoro a
    /// <see cref="AuctionExporter"/>. Qui dentro c'è solo la traduzione fra i campi
    /// dell'interfaccia e i criteri — e il conteggio in tempo reale, che serve a non
    /// scoprire dopo un minuto di scrittura che il filtro non selezionava nulla.</para>
    /// </summary>
    public partial class ExportControl : UserControl
    {
        private string? _lastExportPath;

        public ExportControl()
        {
            InitializeComponent();
            Loaded += (_, _) => RefreshPreview();
        }

        /// <summary>I criteri come sono impostati adesso.</summary>
        public AuctionExportFilter BuildFilter() => new()
        {
            From = FromDatePicker.SelectedDate,
            To = ToDatePicker.SelectedDate,
            NameContains = string.IsNullOrWhiteSpace(NameFilterTextBox.Text) ? null : NameFilterTextBox.Text.Trim(),

            IncludeWon = IncludeWonCheckBox.IsChecked == true,
            IncludeLost = IncludeLostCheckBox.IsChecked == true,
            IncludeClosed = IncludeClosedCheckBox.IsChecked == true,

            OnlyComplete = OnlyCompleteCheckBox.IsChecked == true,
            OnlyWithMyBids = OnlyWithMyBidsCheckBox.IsChecked == true,
            OnlyWithDossier = OnlyWithDossierCheckBox.IsChecked == true,

            MinFinalPrice = ParseNumber(MinPriceTextBox.Text),
            MaxFinalPrice = ParseNumber(MaxPriceTextBox.Text),
            MaxAuctions = (int)(ParseNumber(MaxAuctionsTextBox.Text) ?? 0),

            IncludeEvents = IncludeEventsCheckBox.IsChecked == true
        };

        /// <summary>
        /// Ricalcola quante aste corrispondono. Si fa a ogni modifica dei filtri: sapere
        /// prima che il risultato è vuoto — o che sono duemila — evita di scoprirlo a file
        /// scritto.
        /// </summary>
        public void RefreshPreview()
        {
            try
            {
                var selected = AuctionExporter.Select(BuildFilter());

                MatchCountText.Text = selected.Count == 1 ? "1 asta" : $"{selected.Count} aste";

                var complete = selected.Count(r => r.IsComplete);
                CompleteCountText.Text = $"{complete} complete";

                ExportButton.IsEnabled = selected.Count > 0;
            }
            catch (Exception ex)
            {
                MatchCountText.Text = "—";
                CompleteCountText.Text = ex.Message;
            }
        }

        /// <summary>Mostra l'esito dell'esportazione appena fatta.</summary>
        public void ShowResult(AuctionExportResult result)
        {
            if (result.Success)
            {
                _lastExportPath = result.Path;

                var size = result.Bytes >= 1024 * 1024
                    ? $"{result.Bytes / 1024.0 / 1024.0:F1} MB"
                    : $"{Math.Max(1, result.Bytes / 1024)} kB";

                ResultText.Text = $"{result.AuctionCount} aste ({result.WithEvents} con eventi), {size} — {result.Path}";
                ResultText.SetResourceReference(ForegroundProperty, "Brush.Text");
                OpenLastFileButton.Visibility = Visibility.Visible;
            }
            else
            {
                ResultText.Text = result.Message;
                ResultText.SetResourceReference(ForegroundProperty, "Brush.Warning");
                OpenLastFileButton.Visibility = Visibility.Collapsed;
            }
        }

        /// <summary>Percorso dell'ultimo file scritto, per il pulsante "Apri il file".</summary>
        public string? LastExportPath => _lastExportPath;

        // ── Eventi dell'interfaccia ──────────────────────────────────────

        private void PreviewButton_Click(object sender, RoutedEventArgs e) => RefreshPreview();

        private void Filter_Changed(object sender, RoutedEventArgs e) => RefreshPreview();

        private void Last7Days_Click(object sender, RoutedEventArgs e) => SetPeriod(7);

        private void Last30Days_Click(object sender, RoutedEventArgs e) => SetPeriod(30);

        private void SetPeriod(int days)
        {
            FromDatePicker.SelectedDate = DateTime.Today.AddDays(-days);
            ToDatePicker.SelectedDate = DateTime.Today;
            RefreshPreview();
        }

        private void ResetFiltersButton_Click(object sender, RoutedEventArgs e)
        {
            FromDatePicker.SelectedDate = null;
            ToDatePicker.SelectedDate = null;
            NameFilterTextBox.Text = "";
            MinPriceTextBox.Text = "";
            MaxPriceTextBox.Text = "";
            MaxAuctionsTextBox.Text = "0";

            IncludeWonCheckBox.IsChecked = true;
            IncludeLostCheckBox.IsChecked = true;
            IncludeClosedCheckBox.IsChecked = true;
            OnlyCompleteCheckBox.IsChecked = false;
            OnlyWithMyBidsCheckBox.IsChecked = false;
            OnlyWithDossierCheckBox.IsChecked = false;
            IncludeEventsCheckBox.IsChecked = true;

            RefreshPreview();
        }

        private void ExportButton_Click(object sender, RoutedEventArgs e)
            => RaiseEvent(new RoutedEventArgs(ExportRequestedEvent, this));

        private void OpenFolderButton_Click(object sender, RoutedEventArgs e)
            => RaiseEvent(new RoutedEventArgs(OpenExportFolderClickedEvent, this));

        private void ClearExportsButton_Click(object sender, RoutedEventArgs e)
            => RaiseEvent(new RoutedEventArgs(ClearExportsClickedEvent, this));

        private void OpenLastFileButton_Click(object sender, RoutedEventArgs e)
            => RaiseEvent(new RoutedEventArgs(OpenLastFileClickedEvent, this));

        /// <summary>
        /// Legge un numero accettando sia la virgola sia il punto: chi scrive "12,50" e chi
        /// scrive "12.50" intende la stessa cosa, e rifiutarne uno dei due sarebbe pedanteria.
        /// </summary>
        private static double? ParseNumber(string? text)
        {
            if (string.IsNullOrWhiteSpace(text)) return null;

            var clean = text.Trim().Replace(',', '.');

            return double.TryParse(clean, NumberStyles.Any, CultureInfo.InvariantCulture, out var value)
                ? value
                : null;
        }

        // ── Routed events ────────────────────────────────────────────────

        public static readonly RoutedEvent ExportRequestedEvent = EventManager.RegisterRoutedEvent(
            "ExportRequested", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ExportControl));

        public static readonly RoutedEvent OpenExportFolderClickedEvent = EventManager.RegisterRoutedEvent(
            "OpenExportFolderClicked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ExportControl));

        public static readonly RoutedEvent OpenLastFileClickedEvent = EventManager.RegisterRoutedEvent(
            "OpenLastFileClicked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ExportControl));

        public static readonly RoutedEvent ClearExportsClickedEvent = EventManager.RegisterRoutedEvent(
            "ClearExportsClicked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ExportControl));

        public event RoutedEventHandler ClearExportsClicked
        {
            add { AddHandler(ClearExportsClickedEvent, value); }
            remove { RemoveHandler(ClearExportsClickedEvent, value); }
        }

        public event RoutedEventHandler ExportRequested
        {
            add { AddHandler(ExportRequestedEvent, value); }
            remove { RemoveHandler(ExportRequestedEvent, value); }
        }

        public event RoutedEventHandler OpenExportFolderClicked
        {
            add { AddHandler(OpenExportFolderClickedEvent, value); }
            remove { RemoveHandler(OpenExportFolderClickedEvent, value); }
        }

        public event RoutedEventHandler OpenLastFileClicked
        {
            add { AddHandler(OpenLastFileClickedEvent, value); }
            remove { RemoveHandler(OpenLastFileClickedEvent, value); }
        }
    }
}