using System.Drawing;
using System.Windows.Forms;
using StarfaceOutlookSync.Models;
using StarfaceOutlookSync.Services;

namespace StarfaceOutlookSync.UI
{
    public class SettingsForm : Form
    {
        private CheckBox _chkStartMinimized, _chkSyncOnStart, _chkAutoAcceptOutlook;
        private CheckBox _chkNotifGeneral, _chkNotifWarn;
        private CheckBox _chkAutostartUser, _chkAutostartAll;
        private NumericUpDown _numLogRetention;
        private TextBox _txtSharedDir;
        private Button _btnBrowseShared;
        private Button _btnSave, _btnCancel;
        private readonly UserSettings _settings;

        public SettingsForm()
        {
            _settings = UserSettings.Load();
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            Text = "Einstellungen";
            Size = new Size(380, 250);
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            StartPosition = FormStartPosition.CenterParent;
            Font = new Font("Segoe UI", 9);

            _chkStartMinimized = new CheckBox
            {
                Text = "Minimiert starten (nur im System Tray)",
                Left = 20, Top = 24, AutoSize = true,
                Checked = _settings.StartMinimized
            };

            _chkSyncOnStart = new CheckBox
            {
                Text = "Beim Start automatisch synchronisieren",
                Left = 20, Top = 52, AutoSize = true,
                Checked = _settings.SyncOnStart
            };

            _chkAutoAcceptOutlook = new CheckBox
            {
                Text = "Outlook-Sicherheitsabfrage automatisch erlauben",
                Left = 20, Top = 80, AutoSize = true,
                Checked = _settings.AutoAcceptOutlookPrompt
            };

            var hintText = "Hinweis: Outlook muss nach Aenderung neu gestartet werden.";
            if (UserSettings.IsOutlookSecurityLockedByPolicy())
                hintText += "\nAuf Domaenen-PCs: App einmalig als Admin starten!";

            var lblHint = new Label
            {
                Text = hintText,
                Left = 38, Top = 102, Width = 320, Height = 36,
                ForeColor = UserSettings.IsOutlookSecurityLockedByPolicy() ? Color.OrangeRed : Color.Gray,
                Font = new Font("Segoe UI", 8)
            };

            _chkNotifGeneral = new CheckBox
            {
                Text = "Tray-Benachrichtigungen (allgemein)",
                Left = 20, Top = 144, AutoSize = true,
                Checked = _settings.NotificationsEnabled
            };

            _chkNotifWarn = new CheckBox
            {
                Text = "Benachrichtigungen bei Warnungen/Fehlern (Konflikte, Fehler)",
                Left = 20, Top = 170, AutoSize = true,
                Checked = _settings.NotifyWarningsErrors
            };

            var lblLogRetention = new Label
            {
                Text = "Protokoll auto-leeren - Eintraege aelter als (Tage, 0 = aus):",
                Left = 20, Top = 204, AutoSize = true
            };

            _numLogRetention = new NumericUpDown
            {
                Left = 305, Top = 200, Width = 55, Minimum = 0, Maximum = 3650,
                Value = System.Math.Max(0, System.Math.Min(3650, _settings.LogRetentionDays))
            };

            var lblShared = new Label
            {
                Text = "Gemeinsames Verzeichnis fuer Sync-Sperre (Mehrplatz, optional):",
                Left = 20, Top = 240, AutoSize = true
            };

            _txtSharedDir = new TextBox
            {
                Left = 20, Top = 262, Width = 250,
                Text = _settings.SharedDirectory
            };

            _btnBrowseShared = new Button
            {
                Text = "...", Left = 274, Top = 261, Width = 36, Height = 24
            };
            _btnBrowseShared.Click += (s, e) => BrowseSharedDir();

            var lblSharedHint = new Label
            {
                Text = "Netzlaufwerk/UNC, das alle Arbeitsplaetze erreichen. Leer = keine\n" +
                       "clientuebergreifende Sperre (nur Schutz auf diesem PC).",
                Left = 20, Top = 288, Width = 330, Height = 32,
                ForeColor = Color.Gray, Font = new Font("Segoe UI", 8)
            };

            // === Autostart ===
            bool isAdmin = AutostartManager.IsAdmin();

            var lblAutostart = new Label
            {
                Text = "Autostart (bei Windows-Anmeldung starten)",
                Left = 12, Top = 332, AutoSize = true, Font = new Font("Segoe UI", 10, FontStyle.Bold)
            };

            _chkAutostartUser = new CheckBox
            {
                Text = "Nur fuer diesen Benutzer",
                Left = 20, Top = 360, AutoSize = true,
                Checked = AutostartManager.GetUserAutostart()
            };

            _chkAutostartAll = new CheckBox
            {
                Text = "Fuer alle Benutzer" + (isAdmin ? "" : " (nur mit Admin-Rechten aenderbar)"),
                Left = 20, Top = 386, AutoSize = true,
                Checked = AutostartManager.GetMachineAutostart(),
                Enabled = isAdmin
            };

            _btnSave = new Button
            {
                Text = "Speichern", Left = 95, Top = 422, Width = 85, Height = 28,
                DialogResult = DialogResult.None
            };
            _btnSave.Click += (s, e) => Save();

            _btnCancel = new Button
            {
                Text = "Abbrechen", Left = 189, Top = 422, Width = 85, Height = 28,
                DialogResult = DialogResult.Cancel
            };

            Size = new Size(380, 512);
            Controls.AddRange(new Control[] { _chkStartMinimized, _chkSyncOnStart, _chkAutoAcceptOutlook, lblHint,
                _chkNotifGeneral, _chkNotifWarn, lblLogRetention, _numLogRetention,
                lblShared, _txtSharedDir, _btnBrowseShared, lblSharedHint,
                lblAutostart, _chkAutostartUser, _chkAutostartAll, _btnSave, _btnCancel });
            AcceptButton = _btnSave;
            CancelButton = _btnCancel;
        }

        private void BrowseSharedDir()
        {
            using (var dlg = new FolderBrowserDialog())
            {
                dlg.Description = "Gemeinsames Verzeichnis fuer die Sync-Sperre waehlen";
                if (!string.IsNullOrWhiteSpace(_txtSharedDir.Text))
                {
                    try { dlg.SelectedPath = _txtSharedDir.Text; } catch { }
                }
                if (dlg.ShowDialog(this) == DialogResult.OK)
                    _txtSharedDir.Text = dlg.SelectedPath;
            }
        }

        private void Save()
        {
            _settings.StartMinimized = _chkStartMinimized.Checked;
            _settings.SyncOnStart = _chkSyncOnStart.Checked;
            _settings.AutoAcceptOutlookPrompt = _chkAutoAcceptOutlook.Checked;
            _settings.NotificationsEnabled = _chkNotifGeneral.Checked;
            _settings.NotifyWarningsErrors = _chkNotifWarn.Checked;
            _settings.LogRetentionDays = (int)_numLogRetention.Value;
            _settings.SharedDirectory = _txtSharedDir.Text.Trim();
            _settings.Save();

            // Sofort anwenden, damit der Effekt direkt sichtbar ist.
            Logger.PruneOlderThan(_settings.LogRetentionDays);

            // Autostart (Registry). Pro Benutzer immer; alle Benutzer nur mit Admin.
            AutostartManager.SetUserAutostart(_chkAutostartUser.Checked);
            if (AutostartManager.IsAdmin())
            {
                if (!AutostartManager.SetMachineAutostart(_chkAutostartAll.Checked))
                    MessageBox.Show(this,
                        "Autostart fuer alle Benutzer konnte nicht geaendert werden (Rechte?).",
                        "Autostart", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }

            DialogResult = DialogResult.OK;
            Close();
        }
    }
}