using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;
using FastReport.Utils;
using FastReport.Data;
using FastReport.Controls;

namespace FastReport.Forms
{
    internal partial class ExpressionEditorForm : BaseDialogForm
    {
        private Report report;
        private static List<string> expandedNodes;

        public string ExpressionText
        {
            get { return tbText.Text; }
            set { tbText.Text = value; }
        }

        private string GetTextWithBrackets()
        {
            if (tvData.SelectedItemType == DataTreeSelectedItemType.Function ||
              tvData.SelectedItemType == DataTreeSelectedItemType.CustomItem)
                return tvData.SelectedItem;

            return "[" + tvData.SelectedItem + "]";
        }

        private void tbText_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter && e.Control)
                DialogResult = DialogResult.OK;
            else if (e.KeyData == (Keys.A | Keys.Control))
                tbText.SelectAll();
        }

        private void tvData_AfterSelect(object sender, TreeViewEventArgs e)
        {
            bool descrVisible = tvData.SelectedNode != null &&
              (tvData.SelectedNode.Tag is MethodInfo || tvData.SelectedNode.Tag is SystemVariable);
            expandableSplitter1.Visible = descrVisible;
            lblDescription.Visible = descrVisible;

            if (descrVisible)
                lblDescription.ShowDescription(report, tvData.SelectedNode.Tag);
        }

        private void tvData_ItemDrag(object sender, ItemDragEventArgs e)
        {
            tvData.SelectedNode = e.Item as TreeNode;
            if (tvData.SelectedItem != "")
                tvData.DoDragDrop(e.Item, DragDropEffects.Move);
            else
                tvData.DoDragDrop(e.Item, DragDropEffects.None);
        }

        private void tbText_DragOver(object sender, DragEventArgs e)
        {
            int index = tbText.GetCharIndexFromPosition(tbText.PointToClient(new Point(e.X, e.Y)));
            if (index == tbText.Text.Length - 1)
                index++;
            tbText.Focus();
            tbText.Select(index, 0);
            e.Effect = e.AllowedEffect;
        }

        private void tbText_DragDrop(object sender, DragEventArgs e)
        {
            tbText.SelectedText = GetTextWithBrackets();
            tbText.Focus();
        }

        private void tvData_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (tvData.SelectedItem != "")
            {
                tbText.SelectedText = GetTextWithBrackets();
                tbText.Focus();
            }
        }

        private void splitContainer1_SplitterMoved(object sender, SplitterEventArgs e)
        {
            tbText.Focus();
        }

        private void TextEditorForm_Shown(object sender, EventArgs e)
        {
            tbText.Focus();
            tbText.Select(0, 0);
        }

        private void Init()
        {
            tvData.CreateNodes(report.Dictionary);
        }

        protected override void SaveState()
        {
            base.SaveState();

            Storage.SetDip("Splitter", splitContainer1.SplitterDistance);
            Storage.SetDip("DescriptionHeight", lblDescription.Height);
            expandedNodes = tvData.ExpandedNodes;
        }

        protected override void RestoreState()
        {
            base.RestoreState();

            splitContainer1.SplitterDistance = Storage.GetDip("Splitter", 320, 50, Width - 50);
            lblDescription.Height = Storage.GetDip("DescriptionHeight", 50, 50, 200);
            if (expandedNodes != null)
                tvData.ExpandedNodes = expandedNodes;
        }

        public override void Localize()
        {
            base.Localize();
            Text = Res.Get("Forms,ExpressionEditor");
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            tvData.ImageList = GetImages();
            tbText.Font = this.LogicalToDevice(Storage.GetFont("FormulaEditor", DrawUtils.FixedFont), true);
            MinimumSize = this.LogicalToDevice(new Size(360, 230));
        }

        public ExpressionEditorForm(Report report)
        {
            this.report = report;
            CanSaveRestoreState = true;
            InitializeComponent();
            Localize();
            Init();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }
    }
}