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

namespace FastReport.Controls
{
    internal class ToolStripStyleComboBox : ToolStripComboBox
    {
        private bool updating;
        private Report report;

        public event EventHandler StyleSelected;

        public string Style
        {
            get
            {
                if (ComboBox.Text == Res.Get("Designer,Toolbar,Style,NoStyle"))
                    return "";
                return ComboBox.Text;
            }
            set
            {
                updating = true;
                if (value == null)
                    value = "";
                int i = ComboBox.Items.IndexOf(value);
                if (i != -1)
                    ComboBox.SelectedIndex = i;
                else
                {
                    if (String.IsNullOrEmpty(value))
                        value = Res.Get("Designer,Toolbar,Style,NoStyle");
                    ComboBox.Text = value;
                }
                updating = false;
            }
        }

        public Report Report
        {
            get { return report; }
            set
            {
                report = value;
                if (value != null)
                    UpdateItems();
            }
        }

        private void ComboBox_MeasureItem(object sender, MeasureItemEventArgs e)
        {
            e.ItemHeight = ComboBox.LogicalToDevice(32);
        }

        private void ComboBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            Graphics g = e.Graphics;
            if (e.Index >= 0)
            {
                string name = (string)Items[e.Index];
                float scale = ComboBox.DpiMultiplier();
                using (TextObject sample = new TextObject())
                {
                    sample.Bounds = new RectangleF(e.Bounds.Left + 2, e.Bounds.Top + 2, (int)(e.Bounds.Width / scale) - 4, (int)(e.Bounds.Height / scale) - 4);
                    sample.Text = name;
                    sample.HorzAlign = HorzAlign.Center;
                    sample.VertAlign = VertAlign.Center;
                    if (report != null)
                    {
                        int index = report.Styles.IndexOf(name);
                        if (index != -1)
                            sample.ApplyStyle(report.Styles[index]);
                    }
                    using (GraphicCache cache = new GraphicCache())
                    {
                        sample.Draw(new FRPaintEventArgs(g, scale, scale, cache));
                    }
                }
            }
        }

        private void ComboBox_TextChanged(object sender, EventArgs e)
        {
            if (updating)
                return;
            if (StyleSelected != null)
                StyleSelected(this, EventArgs.Empty);
        }

        private void UpdateItems()
        {
            Items.Clear();
            Items.Add(Res.Get("Designer,Toolbar,Style,NoStyle"));
            foreach (Style s in report.Styles)
            {
                Items.Add(s.Name);
            }
        }

        public void UpdateDpiDependencies(Designer designer)
        {
            Width = designer.LogicalToDevice(100);
            ComboBox.ItemHeight = designer.LogicalToDevice(15);
            DropDownWidth = designer.LogicalToDevice(150);
            DropDownHeight = designer.LogicalToDevice(300);
        }

        public ToolStripStyleComboBox()
        {
            AutoSize = false;
            ComboBox.DrawMode = DrawMode.OwnerDrawVariable;
            ComboBox.ItemHeight = 15;
            ComboBox.DrawItem += ComboBox_DrawItem;
            ComboBox.MeasureItem += ComboBox_MeasureItem;
            ComboBox.TextChanged += ComboBox_TextChanged;
            Size = new Size(100, 25);
            DropDownWidth = 150;
            DropDownHeight = 300;
        }
    }
}