using System;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Controls;
using System.Windows.Media;
using System.Globalization;

namespace LunarSF.SHomeWorkshop.LunarMarkdownEditor
{
    /// <summary>
    /// 此类用于主界面字体列表。
    /// </summary>
    internal class FontFamilyListItem : TextBlock, IComparable
    {
        private string _displayName;

        /// <summary>
        /// [构造方法]用于生成字体列表项。
        /// </summary>
        /// <param name="fontFamily">字体。</param>
        public FontFamilyListItem(FontFamily fontFamily)
        {
            _displayName = GetDisplayName(fontFamily);

            this.FontFamily = fontFamily;
            this.Text = _displayName;
            this.ToolTip = _displayName;

            // In the case of symbol font, apply the default message font to the text so it can be read.
            if (IsSymbolFont(fontFamily))
            {
                TextRange range = new TextRange(this.ContentStart, this.ContentEnd);
                range.ApplyPropertyValue(TextBlock.FontFamilyProperty, SystemFonts.MessageFontFamily);
            }
        }

        /// <summary>
        /// 覆盖方法，显示字体名称。
        /// </summary>
        public override string ToString()
        {
            return _displayName;
        }

        /// <summary>
        /// 根据字体名称来排序的方法。
        /// </summary>
        int IComparable.CompareTo(object obj)
        {
            return string.Compare(_displayName, obj.ToString(), true, CultureInfo.CurrentCulture);
        }

        internal static bool IsSymbolFont(FontFamily fontFamily)
        {
            foreach (Typeface typeface in fontFamily.GetTypefaces())
            {
                GlyphTypeface face;
                if (typeface.TryGetGlyphTypeface(out face))
                {
                    return face.Symbol;
                }
            }
            return false;
        }

        /// <summary>
        /// 取字休的显示名称。
        /// </summary>
        /// <param name="family">字体族。</param>
        /// <returns></returns>
        internal static string GetDisplayName(FontFamily family)
        {
            return NameDictionaryHelper.GetDisplayName(family.FamilyNames);
        }
    }
}