using System.Runtime.InteropServices;
#pragma warning disable CS3001, CS3002, CS3003, CS1591

namespace FastReport.Fonts
{
    /////////////////////////////////////////////////////////////////////////////////////////////////
    // PostScript table
    /////////////////////////////////////////////////////////////////////////////////////////////////
    public class PostScriptClass : TrueTypeTable
    {
        #region "Type definition"
        [StructLayout(LayoutKind.Explicit, Pack = 1)]
        public struct PostScript
        {
            [FieldOffset(0)]
            public uint Version; // version number	0x00010000 for version 1.0.
            [FieldOffset(4)]
            public int ItalicAngle; // Italic angle in counter-clockwise degrees from the vertical. Zero for upright text, negative for text that leans to the right (forward).
            [FieldOffset(8)]
            public short underlinePosition; // This is the suggested distance of the top of the underline from the baseline (negative values indicate below baseline). 
            [FieldOffset(10)]
            public short underlineThickness; // Suggested values for the underline thickness.
            [FieldOffset(12)]
            public uint isFixedPitch; // Set to 0 if the font is proportionally spaced, non-zero if the font is not proportionally spaced (i.e. monospaced).
            [FieldOffset(16)]
            public uint minMemType42; // Minimum memory usage when an OpenType font is downloaded.
            [FieldOffset(20)]
            public uint maxMemType42; // Maximum memory usage when an OpenType font is downloaded.
            [FieldOffset(24)]
            public uint minMemType1; // Minimum memory usage when an OpenType font is downloaded as a Type 1 font.
            [FieldOffset(28)]
            public uint maxMemType1; // Maximum memory usage when an OpenType font is downloaded as a Type 1 font.
        }
        #endregion

        internal PostScript post_script;
        public bool IsItalic
        {
            get
            {
                return post_script.ItalicAngle != 0;
            }

            set
            {
                post_script.ItalicAngle = value ? post_script.ItalicAngle != 0 ? post_script.ItalicAngle : 1 : 0;
            }
        }
        public bool IsFixedPitch { get { return post_script.isFixedPitch != 0; } }

        private void ChangeEndian()
        {
            post_script.Version = SwapUInt32(post_script.Version);
            post_script.ItalicAngle = SwapInt32(post_script.ItalicAngle);
            post_script.underlinePosition = SwapInt16(post_script.underlinePosition);
            post_script.underlineThickness = SwapInt16(post_script.underlineThickness);
            post_script.isFixedPitch = SwapUInt32(post_script.isFixedPitch);
            post_script.minMemType42 = SwapUInt32(post_script.minMemType42);
            post_script.maxMemType42 = SwapUInt32(post_script.maxMemType42);
            post_script.minMemType1 = SwapUInt32(post_script.minMemType1);
            post_script.maxMemType1 = SwapUInt32(post_script.maxMemType1);
        }

        internal override void Load(FontStream stream)
        {
            stream.Seek(this.Offset, System.IO.SeekOrigin.Begin);
            post_script.Version = stream.ReadUInt32(); // version number	0x00010000 for version 1.0.
            post_script.ItalicAngle = stream.ReadInt32(); // Italic angle in counter-clockwise degrees from the vertical. Zero for upright text, negative for text that leans to the right (forward).
            post_script.underlinePosition = stream.ReadInt16(); // This is the suggested distance of the top of the underline from the baseline (negative values indicate below baseline). 
            post_script.underlineThickness = stream.ReadInt16(); // Suggested values for the underline thickness.
            post_script.isFixedPitch = stream.ReadUInt32(); // Set to 0 if the font is proportionally spaced, non-zero if the font is not proportionally spaced (i.e. monospaced).
            post_script.minMemType42 = stream.ReadUInt32(); // Minimum memory usage when an OpenType font is downloaded.
            post_script.maxMemType42 = stream.ReadUInt32(); // Maximum memory usage when an OpenType font is downloaded.
            post_script.minMemType1 = stream.ReadUInt32(); // Minimum memory usage when an OpenType font is downloaded as a Type 1 font.
            post_script.maxMemType1 = stream.ReadUInt32(); // Maximum memory usage when an OpenType font is downloaded as a Type 1 font.
        }

        internal override uint Save(FontStream source_not_used, FontStream font, uint offset)
        {
            font.Position = offset;
            post_script.Version = 0x00030000;

            font.WriteUInt32(post_script.Version);              // public uint Version; // version number	0x00010000 for version 1.0.
            font.WriteInt32(post_script.Version);               // public int ItalicAngle; // Italic angle in counter-clockwise degrees from the vertical. Zero for upright text, negative for text that leans to the right (forward).
            font.WriteInt16(post_script.underlinePosition);     // public short underlinePosition; // This is the suggested distance of the top of the underline from the baseline (negative values indicate below baseline). 
            font.WriteInt16(post_script.underlineThickness);    // public short underlineThickness; // Suggested values for the underline thickness.
            font.WriteUInt32(post_script.isFixedPitch); // public uint isFixedPitch; // Set to 0 if the font is proportionally spaced, non-zero if the font is not proportionally spaced (i.e. monospaced).
            font.WriteUInt32(post_script.minMemType42);      // public uint minMemType42; // Minimum memory usage when an OpenType font is downloaded.
            font.WriteUInt32(post_script.maxMemType42);      // public uint maxMemType42; // Maximum memory usage when an OpenType font is downloaded.
            font.WriteUInt32(post_script.minMemType1);      // public uint minMemType1; // Minimum memory usage when an OpenType font is downloaded as a Type 1 font.
            font.WriteUInt32(post_script.maxMemType1);      // public uint maxMemType1; // Maximum memory usage when an OpenType font is downloaded as a Type 1 font.

            return offset + (uint)this.Length;
        }

        public int ItalicAngle { get { return post_script.ItalicAngle; } }


        public PostScriptClass(TrueTypeTable src) : base(src) { }
    }

}