using FastReport.Utils;
using System.Drawing;
using System.Windows.Forms;

namespace FastReport.Preview
{
    internal class OutlineControl : UserControl
    {
        private TreeView tree;
        private PreviewControl preview;
        private PreparedPages preparedPages;
        private UIStyle style;

        internal PreparedPages PreparedPages
        {
            get { return preparedPages; }
            set
            {
                preparedPages = value;
                UpdateContent();
            }
        }

        internal UIStyle Style
        {
            get { return style; }
            set
            {
                style = value;
                tree.Refresh();
            }
        }

        private void EnumNodes(XmlItem rootItem, TreeNodeCollection rootNode)
        {
            // skip root xml item
            if (rootItem.Parent != null)
            {
                string text = Converter.FromXml(rootItem.GetProp("Text"));
                TreeNode node = new TreeNode();
                node.Text = text;
                node.Tag = rootItem;
                rootNode.Add(node);
                rootNode = node.Nodes;
            }

            for (int i = 0; i < rootItem.Count; i++)
            {
                EnumNodes(rootItem[i], rootNode);
            }
        }

        private void UpdateContent()
        {
            tree.Nodes.Clear();
            if (PreparedPages == null)
                return;

            Outline outline = PreparedPages.Outline;
            tree.BeginUpdate();
            EnumNodes(outline.Xml, tree.Nodes);
            if (tree.Nodes.Count == 1)
                tree.Nodes[0].Expand();
            tree.EndUpdate();

            // to update tree's scrollbars
            Style = Style;
        }

        private void FTree_AfterSelect(object sender, TreeViewEventArgs e)
        {
            // avoid bug when closing the preview
            if (!Visible)
                return;
            if (e.Node == null)
                return;

            XmlItem item = e.Node.Tag as XmlItem;
            string s = item.GetProp("Page");
            if (s != "")
            {
                int pageNo = int.Parse(s);
                s = item.GetProp("Offset");
                if (s != "")
                {
                    float offset = (float)Converter.FromString(typeof(float), s);
                    preview.PositionTo(pageNo + 1, new PointF(0, offset));
                }
            }
        }

        internal void SetPreview(PreviewControl preview)
        {
            this.preview = preview;
        }

        internal void UpdateDpiDependencies()
        {
            tree.Font = this.LogicalToDevice(DrawUtils.DefaultFont);
        }

        /// <summary>
        /// Initializes a new instance of the <b>OutlineControl</b> class with default settings. 
        /// </summary>
        public OutlineControl()
        {
            tree = new TreeView();
            tree.BackColor = SystemColors.Window;
            tree.Dock = DockStyle.Fill;
            tree.HideSelection = false;
            tree.HotTracking = true;
            tree.AfterSelect += new TreeViewEventHandler(FTree_AfterSelect);

            Controls.Add(tree);
            UpdateDpiDependencies();
        }
    }
}