//
// 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 System.Linq;
using System.Collections.Generic;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Svg;
using GCTEXT = GrapeCity.Documents.Text;
using GCDRAW = GrapeCity.Documents.Drawing;
using DsPdfWeb.Demos.Common;

namespace DsPdfWeb.Demos
{
    // This sample shows how to render SVG icons included in the "Free for Web" download of Font Awesome.
    // The sample code also shows how to change the default color of the glyphs.
    public class SvgFontAwesome
    {
        private Random _rnd = Util.NewRandom();

        public int CreatePDF(Stream stream, int paramsIdx = 0)
        {
            return CreatePDF(stream, GetSampleParamsList()[paramsIdx]);
        }

        public int CreatePDF(Stream stream, string[] sampleParams)
        {
            // Load Font Awesome glyphs from the resources:
            var images = new List<(string, GcSvgDocument)>();
            var colorize = sampleParams[3] == "colorize";

            if (colorize)
            {
                foreach (var fname in Directory.GetFiles(Path.Combine("Resources", "FontAwesome"), "*.svg", SearchOption.AllDirectories))
                    images.Add((fname, GcSvgDocument.FromFile(fname)));
                // Randomize image order:
                images.Shuffle();
            }
            else
            {
                foreach (var fname in Directory.GetFiles(Path.Combine("Resources", "FontAwesome", sampleParams[3]), "*.svg", SearchOption.TopDirectoryOnly))
                    images.Add((fname, GcSvgDocument.FromFile(fname)));
                // Sort images by file name:
                images.Sort(new Comparison<(string, GcSvgDocument)>((t1_, t2_) => StringComparer.OrdinalIgnoreCase.Compare(t1_.Item1, t2_.Item1)));
            }

            var doc = new GcPdfDocument();
            // Font and format for captions:
            const float sMargin = 72f / 8;
            var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "segoeui.ttf"));
            var tf = new TextFormat() { Font = font, FontSize = sMargin * 0.65f };

            // Set up a layout grid:
            var background = Color.White;
            var foreground = Color.Black;
            const float margin = 36;
            const int rows = 12;
            const int cols = 9;
            float gapx = 72f / 8, gapy = gapx;
            float sWidth = (doc.PageSize.Width - margin * 2 + gapx) / cols;
            float sHeight = (doc.PageSize.Height - margin * 2 + gapy) / rows;
            if (sWidth > sHeight)
            {
                gapx += sWidth - sHeight;
                sWidth = sHeight;
            }
            else
            {
                gapy += sHeight - sWidth;
                sHeight = sWidth;
            }
            var ip = new PointF(margin, margin);

            // Render all images within the grid, adding new pages as needed:
            var g = doc.NewPage().Graphics;
            for (int i = 0; i < images.Count(); ++i)
            {
                // Draw border around image:
                var rect = new RectangleF(ip, new SizeF(sWidth - gapx, sHeight - gapy));
                g.FillRectangle(rect, background);
                g.DrawRectangle(rect, foreground, 0.5f);
                rect.Inflate(-sMargin, -sMargin);

                // Draw the SVG:
                var svg = images[i].Item2;
                var s = svg.GetIntrinsicSize(SvgLengthUnits.Points);
                if (s.Width > 0 && s.Height > 0)
                {
                    // If image proportions are different from our target rectangle,
                    // we resize the rectangle centering the image in it:
                    var qSrc = s.Width / s.Height;
                    var qTgt = rect.Width / rect.Height;
                    if (qSrc < qTgt)
                        rect.Inflate(rect.Width * (qSrc / qTgt - 1) / 2, 0);
                    else if (qSrc > qTgt)
                        rect.Inflate(0, rect.Height * (qTgt / qSrc - 1) / 2);
                }
                //
                if (colorize)
                    svg.RootSvg.Fill = new SvgPaint(Color.FromArgb(_rnd.Next(256), _rnd.Next(256), _rnd.Next(256)));

                // Render the SVG:
                g.DrawSvg(svg, rect);

                // Print the icon file name as caption in the bottom margin:
                g.DrawString(Path.GetFileNameWithoutExtension(images[i].Item1), tf,
                    new RectangleF(rect.X, rect.Bottom, rect.Width, sMargin),
                    TextAlignment.Center, ParagraphAlignment.Near, false);
                ip.X += sWidth;
                if (ip.X + sWidth > doc.PageSize.Width && i < images.Count() - 1)
                {
                    ip.X = margin;
                    ip.Y += sHeight;
                    if (ip.Y + sHeight > doc.PageSize.Height)
                    {
                        g = doc.NewPage().Graphics;
                        ip.Y = margin;
                    }
                }
            }
            // Done:
            doc.Save(stream);
            // Dispose images after saving the PDF:
            images.ForEach(t_ => t_.Item2.Dispose());
            return doc.Pages.Count;
        }

        public static List<string[]> GetSampleParamsList()
        {
            // Strings are name, description, info, rest are arbitrary strings:
            return new List<string[]>()
            {
                new string[] { "@b-svg/Font Awesome - brands", "Render Font Awesome SVG glyphs from the \"svgs/brands\" directory",
                    "This sample renders the SVG icons included in the \"svgs/brands/\" directory of the Font Awesome \"Free for Web\" download, sorted by file name.",
                    "brands" },
                new string[] { "@b-svg/Font Awesome - regular", "Render Font Awesome SVG glyphs from the \"svgs/regular\" directory",
                    "This sample renders the SVG icons included in the \"svgs/regular/\" directory of the Font Awesome \"Free for Web\" download, sorted by file name.",
                    "regular" },
                new string[] { "@b-svg/Font Awesome - solid", "Render Font Awesome SVG glyphs from the \"svgs/solid\" directory",
                    "This sample renders the SVG icons included in the \"svgs/solid/\" directory of the Font Awesome \"Free for Web\" download, sorted by file name.",
                    "solid" },
                new string[] { "@b-svg/Font Awesome - colorize", "Render Font Awesome SVG glyphs using random order and colors",
                    "This sample renders the SVG icons included in the \"svgs/\" directory of the Font Awesome \"Free for Web\" download, randomizing the order of the icons and their colors.",
                    "colorize" },
            };
        }
    }
}