using System;
using System.Windows.Forms;
using System.Drawing;
using System.Reflection;
using FastReport.Data;
using FastReport.DevComponents.DotNetBar;
using FastReport.Editor.Syntax.Parsers;

namespace FastReport.Controls
{
    internal class DescriptionControl : Panel
    {
        private LabelX lblDescription;

        private void RecalcDescriptionSize()
        {
            // hack to force GetPreferredSize do the work
            lblDescription.UseMnemonic = false;
            int maxWidth = Width - SystemInformation.VerticalScrollBarWidth - 8;
            Size preferredSize = lblDescription.GetPreferredSize(new Size(maxWidth, 0));
            lblDescription.Size = preferredSize;
            if (RightToLeft == RightToLeft.Yes)
            {
                lblDescription.Left = preferredSize.Height > Height ? maxWidth - preferredSize.Width + 8 : Width - preferredSize.Width;
            }
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
            RecalcDescriptionSize();
        }

        public void ShowDescription(Report report, object info)
        {
            string descr = "";

            if (info is SystemVariable)
            {
                descr = "<b>" + (info as SystemVariable).Name + "</b>";
                descr += "<br/><br/>" + ReflectionRepository.DescriptionHelper.GetDescription(info.GetType());
            }
            else if (info is MethodInfo)
            {
                descr = report.CodeHelper.GetMethodSignature(info as MethodInfo, true);
                descr += "<br/><br/>" + ReflectionRepository.DescriptionHelper.GetDescription(info as MethodInfo);

                foreach (ParameterInfo parInfo in (info as MethodInfo).GetParameters())
                {
                    // special case - skip "thisReport" parameter
                    if (parInfo.Name == "thisReport")
                        continue;

                    string s = ReflectionRepository.DescriptionHelper.GetDescription(parInfo);
                    s = s.Replace("<b>", "{i}").Replace("</b>:", "{/i}").Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("{i}", "<i>").Replace("{/i}", "</i>");
                    descr += "<br/><br/>" + s;
                }
            }

            descr = descr.Replace("\t", "<br/>");
            lblDescription.Text = descr;
            RecalcDescriptionSize();
        }

        public DescriptionControl()
        {
            lblDescription = new LabelX();
            lblDescription.AntiAlias = false;
            lblDescription.PaddingLeft = 2;
            lblDescription.PaddingRight = 2;
            lblDescription.PaddingTop = 2;
            lblDescription.TextLineAlignment = StringAlignment.Near;
            lblDescription.UseMnemonic = false;
            lblDescription.WordWrap = true;
            Controls.Add(lblDescription);
            lblDescription.BackColor = SystemColors.Window;

            AutoScroll = true;
            BackColor = SystemColors.Window;
        }
    }
}