using System;
using System.Collections.Generic;
using System.Drawing;
using System.Threading.Tasks;
using System.Windows.Forms;
using StarfaceOutlookSync.Models;
using StarfaceOutlookSync.Services;

namespace StarfaceOutlookSync.UI
{
    public class ProfileEditorForm : Form
    {
        private readonly ProfileManager _pm = new ProfileManager();
        private readonly SyncProfile _existingProfile;
        private readonly bool _isNew;

        // Controls
        private TextBox _txtName, _txtHost, _txtPort, _txtLoginId, _txtPassword, _txtOutlookFolder;
        private CheckBox _chkSsl, _chkEnabled;
        private ComboBox _cmbAddressBook, _cmbDirection;
        private Button _btnBrowseFolder;
        private NumericUpDown _numAutoSync;
        private Button _btnTest, _btnLoadBooks, _btnSave, _btnCancel;
        private Label _lblTestResult;

        private List<StarfaceAddressBook> _addressBooks = new List<StarfaceAddressBook>();
        private List<string> _outlookFolderPaths = new List<string>();
        private string _selectedOutlookPath = "";
        private string _selectedOutlookName = "";

        public ProfileEditorForm(SyncProfile profile)
        {
            _existingProfile = profile;
            _isNew = profile == null;
            InitializeComponent();
            LoadData();
        }

        private void InitializeComponent()
        {
            Text = _isNew ? "Neues Sync-Profil" : "Profil bearbeiten";
            Size = new Size(480, 620);
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            StartPosition = FormStartPosition.CenterParent;
            Font = new Font("Segoe UI", 9);

            var panel = new Panel { Dock = DockStyle.Fill, AutoScroll = true, Padding = new Padding(16) };
            int y = 8;

            // Profilname
            panel.Controls.Add(MakeLabel("Profilname:", 12, y)); y += 22;
            _txtName = new TextBox { Left = 12, Top = y, Width = 420 }; panel.Controls.Add(_txtName); y += 32;

            // === Starface ===
            panel.Controls.Add(MakeSectionLabel("Starface-Verbindung", 12, y)); y += 26;

            panel.Controls.Add(MakeLabel("Host / IP-Adresse:", 12, y)); y += 22;
            _txtHost = new TextBox { Left = 12, Top = y, Width = 320 };
            _txtPort = new TextBox { Left = 340, Top = y, Width = 60, Text = "443" };
            panel.Controls.Add(_txtHost);
            panel.Controls.Add(MakeLabel("Port:", 340, y - 22));
            panel.Controls.Add(_txtPort); y += 32;

            _chkSsl = new CheckBox { Text = "HTTPS verwenden", Left = 12, Top = y, Checked = true, AutoSize = true };
            panel.Controls.Add(_chkSsl); y += 28;

            panel.Controls.Add(MakeLabel("Login-ID:", 12, y)); y += 22;
            _txtLoginId = new TextBox { Left = 12, Top = y, Width = 200 }; panel.Controls.Add(_txtLoginId); y += 32;

            panel.Controls.Add(MakeLabel("Kennwort:", 12, y)); y += 22;
            _txtPassword = new TextBox { Left = 12, Top = y, Width = 200, UseSystemPasswordChar = true };
            panel.Controls.Add(_txtPassword); y += 32;

            _btnTest = new Button { Text = "Verbindung testen", Left = 12, Top = y, Width = 130, Height = 28 };
            _btnTest.Click += async (s, e) => await TestConnection();
            _btnLoadBooks = new Button { Text = "Adressbuecher laden", Left = 150, Top = y, Width = 140, Height = 28 };
            _btnLoadBooks.Click += async (s, e) => await LoadAddressBooks();
            panel.Controls.Add(_btnTest);
            panel.Controls.Add(_btnLoadBooks); y += 32;

            _lblTestResult = new Label { Left = 12, Top = y, Width = 420, Height = 20, ForeColor = Color.Gray };
            panel.Controls.Add(_lblTestResult); y += 26;

            panel.Controls.Add(MakeLabel("Starface-Adressbuch:", 12, y)); y += 22;
            _cmbAddressBook = new ComboBox { Left = 12, Top = y, Width = 420, DropDownStyle = ComboBoxStyle.DropDownList };
            panel.Controls.Add(_cmbAddressBook); y += 32;

            // === Outlook ===
            panel.Controls.Add(MakeSectionLabel("Outlook-Einstellungen", 12, y)); y += 26;

            panel.Controls.Add(MakeLabel("Kontakte-Ordner:", 12, y)); y += 22;
            _txtOutlookFolder = new TextBox { Left = 12, Top = y, Width = 330, ReadOnly = true, BackColor = SystemColors.Window };
            _btnBrowseFolder = new Button { Text = "Durchsuchen...", Left = 348, Top = y - 1, Width = 84, Height = 24 };
            _btnBrowseFolder.Click += (s, e) => BrowseOutlookFolder();
            panel.Controls.Add(_txtOutlookFolder);
            panel.Controls.Add(_btnBrowseFolder); y += 32;

            panel.Controls.Add(MakeLabel("Sync-Richtung:", 12, y)); y += 22;
            _cmbDirection = new ComboBox { Left = 12, Top = y, Width = 250, DropDownStyle = ComboBoxStyle.DropDownList };
            _cmbDirection.Items.AddRange(new object[] { "Bidirektional", "Outlook -> Starface", "Starface -> Outlook" });
            _cmbDirection.SelectedIndex = 0;
            panel.Controls.Add(_cmbDirection); y += 32;

            panel.Controls.Add(MakeLabel("Auto-Sync Intervall (Minuten, 0 = manuell):", 12, y)); y += 22;
            _numAutoSync = new NumericUpDown { Left = 12, Top = y, Width = 80, Minimum = 0, Maximum = 1440, Value = 0 };
            panel.Controls.Add(_numAutoSync); y += 32;

            _chkEnabled = new CheckBox { Text = "Profil aktiviert", Left = 12, Top = y, Checked = true, AutoSize = true };
            panel.Controls.Add(_chkEnabled); y += 36;

            // Buttons
            _btnSave = new Button { Text = "Speichern", Left = 12, Top = y, Width = 100, Height = 30, DialogResult = DialogResult.None };
            _btnSave.Click += (s, e) => SaveProfile();
            _btnCancel = new Button { Text = "Abbrechen", Left = 120, Top = y, Width = 100, Height = 30, DialogResult = DialogResult.Cancel };
            panel.Controls.Add(_btnSave);
            panel.Controls.Add(_btnCancel);

            Controls.Add(panel);
            AcceptButton = _btnSave;
            CancelButton = _btnCancel;
        }

        private Label MakeLabel(string text, int x, int y)
        {
            return new Label { Text = text, Left = x, Top = y, AutoSize = true };
        }

        private Label MakeSectionLabel(string text, int x, int y)
        {
            return new Label { Text = text, Left = x, Top = y, AutoSize = true, Font = new Font("Segoe UI", 10, FontStyle.Bold) };
        }

        private void LoadData()
        {
            // Outlook-Ordner laden
            try
            {
                using (var outlook = new OutlookContactsService())
                {
                    _outlookFolderPaths = outlook.GetContactFolderPaths();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(
                    $"Outlook-Kontaktordner konnten nicht geladen werden:\n{ex.Message}\n\nIst Outlook gestartet?",
                    "Outlook-Verbindung", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                _outlookFolderPaths = new List<string>();
            }

            // Bestehende Werte laden
            if (_existingProfile != null)
            {
                _txtName.Text = _existingProfile.Name;
                _txtHost.Text = _existingProfile.StarfaceConnection.Host;
                _txtPort.Text = _existingProfile.StarfaceConnection.Port.ToString();
                _chkSsl.Checked = _existingProfile.StarfaceConnection.UseSsl;
                _txtLoginId.Text = _existingProfile.StarfaceConnection.LoginId;
                _txtPassword.Text = _existingProfile.StarfaceConnection.Password;
                _chkEnabled.Checked = _existingProfile.Enabled;
                _numAutoSync.Value = _existingProfile.AutoSyncIntervalMinutes;

                _cmbDirection.SelectedIndex = (int)_existingProfile.SyncDirection;

                // Outlook-Ordner
                _selectedOutlookPath = _existingProfile.OutlookFolderPath;
                _selectedOutlookName = _existingProfile.OutlookFolderName;
                _txtOutlookFolder.Text = _selectedOutlookPath;

                // Adressbuch
                if (_existingProfile.StarfaceAddressBook != null)
                {
                    _addressBooks.Add(_existingProfile.StarfaceAddressBook);
                    _cmbAddressBook.Items.Add(_existingProfile.StarfaceAddressBook.Name);
                    _cmbAddressBook.SelectedIndex = 0;
                }
            }
            else if (_outlookFolderPaths.Count > 0)
            {
                // Standard-Ordner vorauswaehlen
                _selectedOutlookPath = _outlookFolderPaths[0];
                _selectedOutlookName = _selectedOutlookPath.Substring(_selectedOutlookPath.LastIndexOf('\\') + 1);
                _txtOutlookFolder.Text = _selectedOutlookPath;
            }
        }

        private void BrowseOutlookFolder()
        {
            using (var browser = new OutlookFolderBrowserForm(_outlookFolderPaths, _selectedOutlookPath))
            {
                if (browser.ShowDialog(this) == DialogResult.OK)
                {
                    _selectedOutlookPath = browser.SelectedFolderPath;
                    _selectedOutlookName = browser.SelectedFolderName;
                    _txtOutlookFolder.Text = _selectedOutlookPath;
                }
            }
        }

        private StarfaceConnection GetConnection()
        {
            return new StarfaceConnection
            {
                Host = _txtHost.Text.Trim(),
                Port = int.TryParse(_txtPort.Text, out var p) ? p : 443,
                UseSsl = _chkSsl.Checked,
                LoginId = _txtLoginId.Text.Trim(),
                Password = _txtPassword.Text
            };
        }

        private async Task TestConnection()
        {
            _lblTestResult.Text = "Teste Verbindung...";
            _lblTestResult.ForeColor = Color.Gray;
            _btnTest.Enabled = false;

            try
            {
                using (var client = new StarfaceApiClient(GetConnection()))
                {
                    var ok = await client.LoginAsync();
                    if (ok)
                    {
                        _lblTestResult.Text = "Verbindung erfolgreich!";
                        _lblTestResult.ForeColor = Color.Green;
                        await client.LogoutAsync();
                    }
                    else
                    {
                        _lblTestResult.Text = "Login fehlgeschlagen. Zugangsdaten pruefen.";
                        _lblTestResult.ForeColor = Color.Red;
                    }
                }
            }
            catch (Exception ex)
            {
                _lblTestResult.Text = $"Fehler: {ex.Message}";
                _lblTestResult.ForeColor = Color.Red;
            }

            _btnTest.Enabled = true;
        }

        private async Task LoadAddressBooks()
        {
            _lblTestResult.Text = "Lade Adressbuecher...";
            _lblTestResult.ForeColor = Color.Gray;
            _btnLoadBooks.Enabled = false;

            try
            {
                using (var client = new StarfaceApiClient(GetConnection()))
                {
                    var ok = await client.LoginAsync();
                    if (!ok)
                    {
                        _lblTestResult.Text = "Login fehlgeschlagen.";
                        _lblTestResult.ForeColor = Color.Red;
                        _btnLoadBooks.Enabled = true;
                        return;
                    }

                    _addressBooks = await client.GetAddressBooksAsync();
                    await client.LogoutAsync();

                    _cmbAddressBook.Items.Clear();
                    foreach (var book in _addressBooks)
                        _cmbAddressBook.Items.Add(book.Name);

                    if (_addressBooks.Count > 0)
                    {
                        _cmbAddressBook.SelectedIndex = 0;
                        _lblTestResult.Text = $"{_addressBooks.Count} Adressbuch/buecher gefunden.";
                        _lblTestResult.ForeColor = Color.Green;
                    }
                    else
                    {
                        _lblTestResult.Text = "Keine Adressbuecher gefunden.";
                        _lblTestResult.ForeColor = Color.Orange;
                    }
                }
            }
            catch (Exception ex)
            {
                _lblTestResult.Text = $"Fehler: {ex.Message}";
                _lblTestResult.ForeColor = Color.Red;
            }

            _btnLoadBooks.Enabled = true;
        }

        private void SaveProfile()
        {
            if (string.IsNullOrWhiteSpace(_txtName.Text))
            {
                MessageBox.Show("Bitte Profilnamen eingeben.", "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (string.IsNullOrWhiteSpace(_txtHost.Text))
            {
                MessageBox.Show("Bitte Starface-Host eingeben.", "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (_cmbAddressBook.SelectedIndex < 0 || _addressBooks.Count == 0)
            {
                MessageBox.Show("Bitte ein Starface-Adressbuch auswaehlen.\nZuerst 'Adressbuecher laden' klicken.",
                    "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            if (string.IsNullOrEmpty(_selectedOutlookPath))
            {
                MessageBox.Show("Bitte einen Outlook-Kontaktordner waehlen.",
                    "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            var profile = new SyncProfile
            {
                Id = _existingProfile?.Id ?? _pm.GenerateId(),
                Name = _txtName.Text.Trim(),
                StarfaceConnection = GetConnection(),
                StarfaceAddressBook = _addressBooks[_cmbAddressBook.SelectedIndex],
                OutlookFolderPath = _selectedOutlookPath,
                OutlookFolderName = _selectedOutlookName,
                SyncDirection = (SyncDirection)_cmbDirection.SelectedIndex,
                Enabled = _chkEnabled.Checked,
                AutoSyncIntervalMinutes = (int)_numAutoSync.Value,
                LastSync = _existingProfile?.LastSync ?? ""
            };

            if (_isNew)
                _pm.AddProfile(profile);
            else
                _pm.UpdateProfile(profile);

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