//
// This code is part of Document Solutions for PDF demos.
// Copyright (c) MESCIUS inc. All rights reserved.
//
using System;
using System.IO;
using System.Drawing;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Text;
using GCTEXT = GrapeCity.Documents.Text;
using GCDRAW = GrapeCity.Documents.Drawing;

namespace DsPdfWeb.Demos.Basics
{
    // This short sample demonstrates how a Font can be loaded from a file
    // and used in your code to render text.
    // The sample relies on font files NotoSerif-Regular.ttf and
    // NotoSerif-BoldItalic.ttf to be present in the Resources/Fonts folder.
    // 
    // NOTE 1: When Font.FromFile() is used, the actual data is loaded on demand,
    // so that usually a Font instance will not take too much space.
    // The situation is different for fonts created using Font.FromArray()
    // and Font.FromStream() methods - in those cases the whole font is
    // immediately loaded into memory. The font will still be parsed
    // only on demand, but memory consumption is slightly higher,
    // so using Font.FromFile() should generally be preferred.
    //
    // NOTE 2: When different Font instances (created using any of the static ctors
    // mentioned above) are used to render text in a PDF, each instance will result
    // in embedding a separate subset of glyphs even if the glyphs are the same,
    // because DsPdf has no way of knowing that two different Font instances 
    // represent the same physical font. So either make sure that only one Font instance
    // is created for each physical font, or better yet use the FontCollection class
    // to add the fonts you need, and specify them via TextFormat.FontName.
    public class FontFromFile
    {
        public int CreatePDF(Stream stream)
        {
            const string sample = "The quick brown fox jumps over the lazy dog.";
            const string fnRegular = "NotoSerif-Regular.ttf";
            const string fnBoldItalic = "NotoSerif-BoldItalic.ttf";

            var fRegular = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", fnRegular)) ??
                throw new Exception($"Could not load font {fnRegular}");

            // Use the loaded font to draw some text:
            var tf = new TextFormat() { Font = fRegular, FontSize = 12 };
            var doc = new GcPdfDocument();
            var g = doc.NewPage().Graphics;
            g.DrawString($"Font {fRegular.FontFamilyName}, size {tf.FontSize}: {sample}", tf, new PointF(18, 72));
            // We can change the font size:
            tf.FontSize += 2;
            g.DrawString($"Font {fRegular.FontFamilyName}, size {tf.FontSize}: {sample}", tf, new PointF(18, 72 * 2));
            // We can tell DsPdf to emulate bold and/or italic style with a regular font:
            tf.FontStyle = GCTEXT.FontStyle.BoldItalic;
            g.DrawString($"Font {fRegular.FontFamilyName}, emulated Bold Italic: {sample}", tf, new PointF(18, 72 * 3));
            // But of course rather than emulated, it is better to use real bold/italic fonts.
            // So finally, get a real bold italic font and print a line with it:
            var fBoldItalic = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", fnBoldItalic)) ??
                throw new Exception($"Could not load font {fnBoldItalic}");
            tf.Font = fBoldItalic;
            tf.FontStyle = GCTEXT.FontStyle.Regular;
            g.DrawString($"Font {fBoldItalic.FontFamilyName}, real Bold Italic: {sample}", tf, new PointF(18, 72 * 4));
            // Done:
            doc.Save(stream);
            return doc.Pages.Count;
        }
    }
}