using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Text;
using System.Windows.Forms;

namespace Volian.Base.Library
{
    public static class vlnFont
    {
        private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        private static InstalledFontCollection _MyFontCollection = new InstalledFontCollection();
        private static string _ProportionalSymbolFont = null;
        // C2017-036 Look for suitable proportional font that will support the symbol characters used in PROMS
        //           Microsoft removed Arial Unicode MS starting with Word16 (office 365 containing that version of Word)
        public static string ProportionalSymbolFont
        {
            get {
                if (_ProportionalSymbolFont == null)
                {
									// C2019-022 Microsoft no longer supplies the Arial Unicode font.  New computers more than likely do not have this font
									//           Since this font is no longer supported, we will now use FreeSerif or FreeMono for symbol characters
									//           when using a proportional font.
									//           We removed even checking if Arial Unicode was installed because we had a case (at Volian) where the font
									//           existed (was installed on a Windows 10 computer) but so some reason (unknown at time of writing) Windows say it was bad.
									//           PROMS would will try to use it when printing resulting in very slow print speed and often an un-readable PDF file.
                    if (FindFontFamily("FreeSerif"))
                        _ProportionalSymbolFont = "FreeSerif"; // volian supplied font but regular chars look like Times Roman
                    else if (FindFontFamily("FreeMono"))
                         _ProportionalSymbolFont = "FreeMono"; // volian suppllied font but regular chars are fixed spaced and look like Courier
                    else
                    {
                        MessageBox.Show("A suitable font for symbol characters could not be found.\n\n"
                            +"Please install Arial Unicode MS and/or the Volian supplied fonts", "Symbol Font");
                        _MyLog.Error("Could Not File a Proportional Symbol Font to use.");
                        _ProportionalSymbolFont = "Arial"; // if volian fonts not installed, default to plain Arial (which does not have all of the symbols that we use)
                    }
               }
                return _ProportionalSymbolFont; 
            }
        }


        // C2017-036 Look for suitable proportional font that will support the symbol characters used in PROMS
        //           Microsoft removed Arial Unicode MS starting with Word16 (office 365 containing that version of Word)
        //           This font (below) is used only for the Reports - trying to find a font similar to Arial Unicode MS
        private static string _ReportsFont = null;

        public static string ReportsFont
        {
            get {
                if (_ReportsFont == null)
                {
									// C2019-022 Microsoft no longer supplies the Arial Unicode font.  New computers more than likely do not have this font
									//           Since this font is no longer supported, we will now use FreeSerif or FreeMono for symbol characters
									//           when using a proportional font.
									//           Also the Meiryo font will not be used as it cannot be used along with the Arial font.
                   if (FindFontFamily("FreeSerif")) // volian supplied font but regular chars look like Times Roman
                        _ReportsFont = "FreeSerif";
                    else if (FindFontFamily("FreeMono")) // volian suppllied font but regular chars are fixed spaced and look like Courier
                         _ReportsFont = "FreeMono";
                    else
                    {
                        MessageBox.Show("A suitable font to use to generate Reports could not be found.\n\n"
                            +"Please install Arial Unicode MS and/or the Volian supplied fonts", "Report Font");
                        _MyLog.Error("Could Not File a font to use for Report generation.");
                        _ReportsFont = "Arial";
                    }
               }
                return _ReportsFont; 
            }
        }

        // see if the given font exists on the computer running PROMS
        private static bool FindFontFamily(string name)
        {
            foreach (FontFamily ff in _MyFontCollection.Families)
                if (ff.Name == name) return true;
            return false;
        }
    }
}