using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Threading.Tasks;
using System.Timers;
using System.Windows.Forms;
using StarfaceOutlookSync.Models;
using StarfaceOutlookSync.Services;
using Timer = System.Timers.Timer;

namespace StarfaceOutlookSync.UI
{
    public class MainForm : Form
    {
        private readonly ProfileManager _profileManager = new ProfileManager();
        private readonly SyncEngine _syncEngine = new SyncEngine();
        private NotifyIcon _trayIcon;
        private ContextMenuStrip _trayMenu;
        private ListView _profileList;
        private Button _btnNew, _btnEdit, _btnDelete, _btnSync, _btnSettings, _btnInfo;
        private StatusStrip _statusBar;
        private ToolStripStatusLabel _statusLabel;
        private Timer _autoSyncTimer;

        public MainForm()
        {
            InitializeComponent();
            SetupTrayIcon();
            SetupAutoSync();
            RefreshProfileList();

            // Minimiert starten falls in Einstellungen aktiviert
            var settings = UserSettings.Load();
            if (settings.StartMinimized)
            {
                WindowState = FormWindowState.Minimized;
                ShowInTaskbar = false;
                Visible = false;
            }
        }

        protected override void SetVisibleCore(bool value)
        {
            // Beim ersten Anzeigen pruefen ob minimiert gestartet werden soll
            if (!IsHandleCreated)
            {
                var settings = UserSettings.Load();
                if (settings.StartMinimized)
                {
                    CreateHandle();
                    value = false;
                }
            }
            base.SetVisibleCore(value);
        }

        private void InitializeComponent()
        {
            Text = "Starface Kontakt-Sync";
            Size = new Size(620, 450);
            MinimumSize = new Size(500, 350);
            StartPosition = FormStartPosition.CenterScreen;
            Font = new Font("Segoe UI", 9);

            // Profil-Liste
            _profileList = new ListView
            {
                Dock = DockStyle.Fill,
                View = View.Details,
                FullRowSelect = true,
                GridLines = true,
                MultiSelect = false
            };
            _profileList.Columns.Add("Profil", 150);
            _profileList.Columns.Add("Starface", 130);
            _profileList.Columns.Add("Outlook-Ordner", 130);
            _profileList.Columns.Add("Richtung", 90);
            _profileList.Columns.Add("Letzte Sync", 130);
            _profileList.DoubleClick += (s, e) => EditProfile();

            // Button-Panel
            var buttonPanel = new FlowLayoutPanel
            {
                Dock = DockStyle.Bottom,
                Height = 45,
                Padding = new Padding(8, 8, 8, 4),
                FlowDirection = FlowDirection.LeftToRight
            };

            _btnNew = new Button { Text = "Neues Profil", Width = 100, Height = 30 };
            _btnNew.Click += (s, e) => NewProfile();

            _btnEdit = new Button { Text = "Bearbeiten", Width = 90, Height = 30 };
            _btnEdit.Click += (s, e) => EditProfile();

            _btnDelete = new Button { Text = "Loeschen", Width = 80, Height = 30 };
            _btnDelete.Click += (s, e) => DeleteProfile();

            _btnSync = new Button { Text = "Jetzt synchronisieren", Width = 150, Height = 30 };
            _btnSync.Click += async (s, e) => await SyncSelectedProfile();

            _btnSettings = new Button { Text = "Einstellungen", Width = 100, Height = 30 };
            _btnSettings.Click += (s, e) => ShowSettings();

            _btnInfo = new Button { Text = "Info", Width = 50, Height = 30 };
            _btnInfo.Click += (s, e) => ShowAbout();

            buttonPanel.Controls.AddRange(new Control[] { _btnNew, _btnEdit, _btnDelete, _btnSync, _btnSettings, _btnInfo });

            // Statusbar
            _statusBar = new StatusStrip();
            _statusLabel = new ToolStripStatusLabel("Bereit");
            _statusBar.Items.Add(_statusLabel);

            Controls.Add(_profileList);
            Controls.Add(buttonPanel);
            Controls.Add(_statusBar);
        }

        private void SetupTrayIcon()
        {
            _trayMenu = new ContextMenuStrip();
            _trayMenu.Items.Add("Oeffnen", null, (s, e) => ShowMainWindow());
            _trayMenu.Items.Add("-");

            // Schnell-Sync fuer jedes Profil
            var profiles = _profileManager.GetProfiles();
            foreach (var p in profiles.Where(p => p.Enabled))
            {
                var profile = p;
                _trayMenu.Items.Add($"Sync: {profile.Name}", null, async (s, e) =>
                {
                    await RunSync(profile);
                });
            }

            if (profiles.Any(p => p.Enabled))
                _trayMenu.Items.Add("-");

            _trayMenu.Items.Add("Beenden", null, (s, e) => ExitApplication());

            _trayIcon = new NotifyIcon
            {
                Text = "Starface Kontakt-Sync",
                Icon = SystemIcons.Application, // Placeholder, wird durch eigenes Icon ersetzt
                ContextMenuStrip = _trayMenu,
                Visible = true
            };

            _trayIcon.DoubleClick += (s, e) => ShowMainWindow();
        }

        private void SetupAutoSync()
        {
            _autoSyncTimer = new Timer(60000); // Jede Minute pruefen
            _autoSyncTimer.Elapsed += async (s, e) => await CheckAutoSync();
            _autoSyncTimer.Start();
        }

        private async Task CheckAutoSync()
        {
            var profiles = _profileManager.GetProfiles();
            foreach (var profile in profiles.Where(p => p.Enabled && p.AutoSyncIntervalMinutes > 0))
            {
                if (string.IsNullOrEmpty(profile.LastSync))
                {
                    await RunSync(profile);
                    continue;
                }

                if (DateTime.TryParse(profile.LastSync, out var lastSync))
                {
                    if (DateTime.Now - lastSync > TimeSpan.FromMinutes(profile.AutoSyncIntervalMinutes))
                    {
                        await RunSync(profile);
                    }
                }
            }
        }

        private void ShowMainWindow()
        {
            Show();
            WindowState = FormWindowState.Normal;
            BringToFront();
            RefreshProfileList();
        }

        private void RefreshProfileList()
        {
            _profileList.Items.Clear();
            var profiles = _profileManager.GetProfiles();

            foreach (var p in profiles)
            {
                var dirText = p.SyncDirection == SyncDirection.Both ? "Bidirektional" :
                    p.SyncDirection == SyncDirection.OutlookToStarface ? "OL -> SF" : "SF -> OL";
                var lastSync = string.IsNullOrEmpty(p.LastSync) ? "Noch nie" :
                    DateTime.TryParse(p.LastSync, out var dt) ? dt.ToString("dd.MM.yyyy HH:mm") : p.LastSync;

                var item = new ListViewItem(new[]
                {
                    p.Name,
                    $"{p.StarfaceConnection.Host} / {p.StarfaceAddressBook.Name}",
                    p.OutlookFolderName,
                    dirText,
                    lastSync
                });
                item.Tag = p;

                if (!p.Enabled)
                    item.ForeColor = Color.Gray;

                _profileList.Items.Add(item);
            }

            // Tray-Menu aktualisieren
            SetupTrayIcon();
        }

        private void NewProfile()
        {
            using (var editor = new ProfileEditorForm(null))
            {
                if (editor.ShowDialog(this) == DialogResult.OK)
                    RefreshProfileList();
            }
        }

        private void EditProfile()
        {
            if (_profileList.SelectedItems.Count == 0) return;
            var profile = _profileList.SelectedItems[0].Tag as SyncProfile;
            if (profile == null) return;

            using (var editor = new ProfileEditorForm(profile))
            {
                if (editor.ShowDialog(this) == DialogResult.OK)
                    RefreshProfileList();
            }
        }

        private void DeleteProfile()
        {
            if (_profileList.SelectedItems.Count == 0) return;
            var profile = _profileList.SelectedItems[0].Tag as SyncProfile;
            if (profile == null) return;

            if (MessageBox.Show($"Profil '{profile.Name}' wirklich loeschen?",
                "Profil loeschen", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                _profileManager.DeleteProfile(profile.Id);
                RefreshProfileList();
            }
        }

        private Task SyncSelectedProfile()
        {
            if (_profileList.SelectedItems.Count == 0)
            {
                MessageBox.Show("Bitte ein Profil auswaehlen.", "Sync",
                    MessageBoxButtons.OK, MessageBoxIcon.Information);
                return Task.CompletedTask;
            }

            var profile = _profileList.SelectedItems[0].Tag as SyncProfile;
            if (profile == null) return Task.CompletedTask;

            using (var syncForm = new SyncProgressForm(profile))
            {
                syncForm.ShowDialog(this);
            }

            RefreshProfileList();
            return Task.CompletedTask;
        }

        private async Task RunSync(SyncProfile profile)
        {
            try
            {
                SetStatus($"Synchronisiere '{profile.Name}'...");
                _trayIcon.ShowBalloonTip(2000, "Starface Sync",
                    $"Synchronisiere '{profile.Name}'...", ToolTipIcon.Info);

                var result = await _syncEngine.SyncProfileAsync(profile);

                var msg = $"{profile.Name}: {result.Created} erstellt, {result.Updated} aktualisiert";
                if (result.Errors > 0) msg += $", {result.Errors} Fehler";

                _trayIcon.ShowBalloonTip(3000, "Starface Sync", msg,
                    result.Errors > 0 ? ToolTipIcon.Warning : ToolTipIcon.Info);

                SetStatus(msg);
            }
            catch (Exception ex)
            {
                _trayIcon.ShowBalloonTip(3000, "Starface Sync Fehler",
                    ex.Message, ToolTipIcon.Error);
                SetStatus($"Fehler: {ex.Message}");
            }
        }

        private void SetStatus(string text)
        {
            if (InvokeRequired)
                Invoke(new Action(() => _statusLabel.Text = text));
            else
                _statusLabel.Text = text;
        }

        private void ShowSettings()
        {
            using (var settings = new SettingsForm())
            {
                settings.ShowDialog(this);
            }
        }

        private void ShowAbout()
        {
            using (var about = new AboutForm())
            {
                about.ShowDialog(this);
            }
        }

        private void ExitApplication()
        {
            _autoSyncTimer?.Stop();
            _trayIcon.Visible = false;
            _trayIcon.Dispose();
            Application.Exit();
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            if (e.CloseReason == CloseReason.UserClosing)
            {
                e.Cancel = true;
                Hide(); // In den Tray minimieren
                _trayIcon.ShowBalloonTip(2000, "Starface Kontakt-Sync",
                    "Laeuft im Hintergrund weiter. Rechtsklick auf das Tray-Icon fuer Optionen.",
                    ToolTipIcon.Info);
            }
            else
            {
                base.OnFormClosing(e);
            }
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                _autoSyncTimer?.Dispose();
                _trayIcon?.Dispose();
                _trayMenu?.Dispose();
            }
            base.Dispose(disposing);
        }
    }
}