using System;
using System.Drawing;
using System.Windows.Forms;
using System.Collections.Generic;

namespace StarfaceOutlookSync.UI
{
    public class OutlookFolderBrowserForm : Form
    {
        private TreeView _tree;
        private Button _btnOk, _btnCancel;
        public string SelectedFolderPath { get; private set; } = "";
        public string SelectedFolderName { get; private set; } = "";

        public OutlookFolderBrowserForm(List<string> folderPaths, string currentSelection)
        {
            InitializeComponent();
            BuildTree(folderPaths, currentSelection);
        }

        private void InitializeComponent()
        {
            Text = "Outlook-Ordner waehlen";
            Size = new Size(400, 450);
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            StartPosition = FormStartPosition.CenterParent;
            Font = new Font("Segoe UI", 9);

            var lblInfo = new Label
            {
                Text = "Bitte waehlen Sie den Outlook-Kontaktordner fuer die Synchronisation:",
                Left = 12, Top = 12, Width = 360, Height = 36
            };

            _tree = new TreeView
            {
                Left = 12, Top = 52, Width = 360, Height = 310,
                HideSelection = false,
                ShowLines = true,
                ShowPlusMinus = true,
                ShowRootLines = true
            };
            _tree.DoubleClick += (s, e) => { if (_tree.SelectedNode?.Tag != null) SelectAndClose(); };

            _btnOk = new Button
            {
                Text = "OK", Left = 210, Top = 372, Width = 75, Height = 28,
                DialogResult = DialogResult.None
            };
            _btnOk.Click += (s, e) => SelectAndClose();

            _btnCancel = new Button
            {
                Text = "Abbrechen", Left = 292, Top = 372, Width = 80, Height = 28,
                DialogResult = DialogResult.Cancel
            };

            Controls.AddRange(new Control[] { lblInfo, _tree, _btnOk, _btnCancel });
            AcceptButton = _btnOk;
            CancelButton = _btnCancel;
        }

        private void BuildTree(List<string> folderPaths, string currentSelection)
        {
            _tree.Nodes.Clear();
            var nodeMap = new Dictionary<string, TreeNode>();

            foreach (var path in folderPaths)
            {
                // Pfad: \\Store\Kontakte\Unterordner
                var parts = path.TrimStart('\\').Split('\\');
                string runningPath = "";
                TreeNode parent = null;

                for (int i = 0; i < parts.Length; i++)
                {
                    runningPath += "\\" + parts[i];

                    if (!nodeMap.ContainsKey(runningPath))
                    {
                        var node = new TreeNode(parts[i]);
                        // Nur Blatt-Knoten oder bekannte Pfade sind waehlbar
                        if (i == parts.Length - 1)
                            node.Tag = path; // Vollstaendiger Pfad

                        if (parent == null)
                            _tree.Nodes.Add(node);
                        else
                            parent.Nodes.Add(node);

                        nodeMap[runningPath] = node;

                        // Aktuellen Ordner vorauswaehlen
                        if (path == currentSelection)
                        {
                            _tree.SelectedNode = node;
                            node.EnsureVisible();
                        }
                    }

                    parent = nodeMap[runningPath];
                }
            }

            _tree.ExpandAll();
        }

        private void SelectAndClose()
        {
            if (_tree.SelectedNode?.Tag == null)
            {
                MessageBox.Show("Bitte einen Kontaktordner waehlen.", "Hinweis",
                    MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            SelectedFolderPath = _tree.SelectedNode.Tag.ToString();
            SelectedFolderName = _tree.SelectedNode.Text;
            DialogResult = DialogResult.OK;
            Close();
        }
    }
}