using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;

using Vintasoft.Imaging.Fonts;

namespace CommonCode
{
    /// <summary>
    /// Provides access to the fonts, which are located in the specified directory.
    /// </summary>
    public class CustomFontProgramsController : FileFontProgramsControllerWithFallbackFont
    {

        #region Constants

        /// <summary>
        /// The folder that contains the fonts.
        /// </summary>
        const string FontsFolder = "fonts";

        /// <summary>
        /// The filename of serialized font programs controller.
        /// </summary>
        const string FontProgramsControllerFilename = "fonts.dat";

        #endregion



        #region Constructors

        /// <summary>
        /// Initializes the <see cref="CustomFontProgramsController"/> class.
        /// </summary>
        static CustomFontProgramsController()
        {
            RegisterSerializingType<CustomFontProgramsController>();
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="CustomFontProgramsController"/> class.
        /// </summary>
        public CustomFontProgramsController()
            : base(true, GetFontFolders())
        {
            if (FontFiles.Count == 0)
            {
                Console.WriteLine("CustomFontProgramsController: Fonts was not found!");
            }
            else
            {
                RefreshFontNames();
            }
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="CustomFontProgramsController"/> class.
        /// </summary>
        /// <param name="info">The SerializationInfo to populate with data.</param>
        /// <param name="context">The destination for this serialization.</param>
        public CustomFontProgramsController(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
        }

        #endregion



        #region Methods

        /// <summary>
        /// Sets <see cref="CustomFontProgramsController"/> as the default font programs controller.
        /// </summary>
        public static void SetDefaultFontProgramsController()
        {
            Default = CreateOrDeserialize();
        }

        /// <summary>
        /// Creates or deserializes the <see cref="CustomFontProgramsController"/>.
        /// </summary>
        /// <returns>A new instance of <see cref="CustomFontProgramsController"/>.</returns>
        public static CustomFontProgramsController CreateOrDeserialize()
        {
            CustomFontProgramsController result = null;

            // if file with serialized font program controller exists
            if (File.Exists(FontProgramsControllerFilename))
            {
                try
                {
                    // deserialize font program controller
                    result = (CustomFontProgramsController)Deserialize(FontProgramsControllerFilename);
                }
                catch
                {
                }
            }

            // if font program controller is not deserialized
            if (result == null)
            {
                // create new font program controller
                result = new CustomFontProgramsController();

                // if font program controller contains fonts
                if (result.FontFiles.Count > 0)
                {
                    // serialize font program controller
                    Serialize(FontProgramsControllerFilename, result);
                }
            }

            return result;
        }

        /// <summary>
        /// Returns array that contains paths to the folders with fonts.
        /// </summary>
        private static string[] GetFontFolders()
        {
            List<string> result = new List<string>();
            
            string systemFontFolder;
            if (Vintasoft.Imaging.ImagingEnvironment.IsWindows)
                systemFontFolder = Path.Combine(Environment.GetEnvironmentVariable("windir"), "Fonts");
            else
                systemFontFolder = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);            
            if (!string.IsNullOrEmpty(systemFontFolder))
                result.Add(systemFontFolder);
            
            result.Add(FontsFolder);

            return result.ToArray();
        }

        #endregion

    }
}

Imports System.Collections.Generic
Imports System.IO
Imports System.Runtime.Serialization

Imports Vintasoft.Imaging.Fonts

Namespace CommonCode
    ''' <summary>
    ''' Provides access to the fonts, which are located in the specified directory.
    ''' </summary>
    Public Class CustomFontProgramsController
        Inherits FileFontProgramsControllerWithFallbackFont

        #Region "Constants"

        ''' <summary>
        ''' The folder that contains the fonts.
        ''' </summary>
        Const FontsFolder As String = "fonts"

        ''' <summary>
        ''' The filename of serialized font programs controller.
        ''' </summary>
        Const FontProgramsControllerFilename As String = "fonts.dat"

        #End Region



        #Region "Constructors"

        ''' <summary>
        ''' Initializes the <see cref="CustomFontProgramsController"/> class.
        ''' </summary>
        Shared Sub New()
            RegisterSerializingType(Of CustomFontProgramsController)()
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="CustomFontProgramsController"/> class.
        ''' </summary>
        Public Sub New()
            MyBase.New(True, GetFontFolders())
            If FontFiles.Count = 0 Then
                Console.WriteLine("CustomFontProgramsController: Fonts was not found!")
            Else
                RefreshFontNames()
            End If
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="CustomFontProgramsController"/> class.
        ''' </summary>
        ''' <param name="info">The SerializationInfo to populate with data.</param>
        ''' <param name="context">The destination for this serialization.</param>
        Public Sub New(info As SerializationInfo, context As StreamingContext)
            MyBase.New(info, context)
        End Sub

        #End Region



        #Region "Methods"

        ''' <summary>
        ''' Sets <see cref="CustomFontProgramsController"/> as the default font programs controller.
        ''' </summary>
        Public Shared Sub SetDefaultFontProgramsController()
            [Default] = CreateOrDeserialize()
        End Sub

        ''' <summary>
        ''' Creates or deserializes the <see cref="CustomFontProgramsController"/>.
        ''' </summary>
        ''' <returns>A new instance of <see cref="CustomFontProgramsController"/>.</returns>
        Public Shared Function CreateOrDeserialize() As CustomFontProgramsController
            Dim result As CustomFontProgramsController = Nothing

            ' if file with serialized font program controller exists
            If File.Exists(FontProgramsControllerFilename) Then
                Try
                    ' deserialize font program controller
                    result = DirectCast(Deserialize(FontProgramsControllerFilename), CustomFontProgramsController)
                Catch
                End Try
            End If

            ' if font program controller is not deserialized
            If result Is Nothing Then
                ' create new font program controller
                result = New CustomFontProgramsController()

                ' if font program controller contains fonts
                If result.FontFiles.Count > 0 Then
                    ' serialize font program controller
                    Serialize(FontProgramsControllerFilename, result)
                End If
            End If

            Return result
        End Function

        ''' <summary>
        ''' Returns array that contains paths to the folders with fonts.
        ''' </summary>
        Private Shared Function GetFontFolders() As String()
            Dim result As New List(Of String)()

            Dim systemFontFolder As String
            If Vintasoft.Imaging.ImagingEnvironment.IsWindows Then
                systemFontFolder = Path.Combine(Environment.GetEnvironmentVariable("windir"), "Fonts")
            Else
                systemFontFolder = Environment.GetFolderPath(Environment.SpecialFolder.Fonts)
            End If
            If Not String.IsNullOrEmpty(systemFontFolder) Then
                result.Add(systemFontFolder)
            End If

            result.Add(FontsFolder)

            Return result.ToArray()
        End Function

        #End Region

    End Class
End Namespace