/******************************************************************************
// MARECHAI: Master repository of computing history artifacts information
// ----------------------------------------------------------------------------
//
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2003-2021 Natalia Portillo
*******************************************************************************/

using System;
using System.IO;
using Marechai.Database.Models;
using SkiaSharp;
using Svg.Skia;

namespace Marechai.Server.Helpers;

public static class SvgRender
{
    public static void RenderCountries()
    {
        if(!Directory.Exists("wwwroot/assets/flags/countries")) return;

        foreach(string file in Directory.GetFiles("wwwroot/assets/flags/countries/",
                                                  "*.svg",
                                                  SearchOption.TopDirectoryOnly))
        {
            SKSvg svg = null;

            string flagName = Path.GetFileNameWithoutExtension(file);

            foreach(string format in new[]
                    {
                        "png", "webp"
                    })
            {
                if(!Directory.Exists(Path.Combine("wwwroot/assets/flags/countries",          format)))
                    Directory.CreateDirectory(Path.Combine("wwwroot/assets/flags/countries", format));

                SKEncodedImageFormat skFormat;

                switch(format)
                {
                    case "webp":
                        skFormat = SKEncodedImageFormat.Webp;

                        break;
                    default:
                        skFormat = SKEncodedImageFormat.Png;

                        break;
                }

                foreach(int multiplier in new[]
                        {
                            1, 2, 3
                        })
                {
                    if(!Directory.Exists(Path.Combine("wwwroot/assets/flags/countries", format, $"{multiplier}x")))
                    {
                        Directory.CreateDirectory(Path.Combine("wwwroot/assets/flags/countries",
                                                               format,
                                                               $"{multiplier}x"));
                    }

                    string rendered = Path.Combine("wwwroot/assets/flags/countries",
                                                   format,
                                                   $"{multiplier}x",
                                                   flagName + $".{format}");

                    if(File.Exists(rendered)) continue;

                    Console.WriteLine("Rendering {0}", rendered);

                    if(svg == null)
                    {
                        svg = new SKSvg();
                        svg.Load(file);
                    }

                    var outFs = new FileStream(rendered, FileMode.CreateNew);
                    RenderSvg(svg, outFs, skFormat, 32, multiplier);
                    outFs.Close();
                }
            }
        }
    }

    public static void ImportCompanyLogos(MarechaiContext context)
    {
        if(!Directory.Exists("wwwroot/assets/incoming")) return;

        foreach(string file in Directory.GetFiles("wwwroot/assets/incoming",
                                                  "company_*.svg",
                                                  SearchOption.TopDirectoryOnly))
        {
            string filename = Path.GetFileNameWithoutExtension(file);

            if(!filename.StartsWith("company_", StringComparison.InvariantCulture)) continue;

            string[] pieces = filename.Split('_');

            if(pieces.Length != 3) continue;

            var guid = Guid.NewGuid();

            if(!int.TryParse(pieces[1], out int companyId)) continue;

            if(!int.TryParse(pieces[2], out int year)) continue;

            try
            {
                context.CompanyLogos.Add(new CompanyLogo
                {
                    CompanyId = companyId,
                    Year      = year,
                    Guid      = guid
                });

                context.SaveChanges();
            }
            catch(Exception)
            {
                continue;
            }

            SKSvg svg = null;

            foreach(int minSize in new[]
                    {
                        256, 32
                    })
            {
                foreach(string format in new[]
                        {
                            "png", "webp"
                        })
                {
                    string outDir = minSize == 32
                                        ? Path.Combine("wwwroot/assets/logos/thumbs", format)
                                        : Path.Combine("wwwroot/assets/logos",        format);

                    if(!Directory.Exists(outDir)) Directory.CreateDirectory(outDir);

                    SKEncodedImageFormat skFormat;

                    switch(format)
                    {
                        case "webp":
                            skFormat = SKEncodedImageFormat.Webp;

                            break;
                        default:
                            skFormat = SKEncodedImageFormat.Png;

                            break;
                    }

                    foreach(int multiplier in new[]
                            {
                                1, 2, 3
                            })
                    {
                        string outPath = Path.Combine(outDir, $"{multiplier}x");

                        if(!Directory.Exists(outPath)) Directory.CreateDirectory(outPath);

                        string rendered = Path.Combine(outPath, $"{guid}.{format}");

                        if(File.Exists(rendered)) continue;

                        Console.WriteLine("Rendering {0}", rendered);

                        if(svg == null)
                        {
                            svg = new SKSvg();
                            svg.Load(file);
                        }

                        var outFs = new FileStream(rendered, FileMode.CreateNew);
                        RenderSvg(svg, outFs, skFormat, minSize, multiplier);
                        outFs.Close();
                    }
                }
            }

            File.Move(file, $"wwwroot/assets/logos/{guid}.svg");
        }
    }

    public static void RenderSvg(SKSvg svg, Stream outStream, SKEncodedImageFormat skFormat, int minSize,
                                 int   multiplier)
    {
        SKRect svgSize   = svg.Picture.CullRect;
        float  svgMax    = Math.Max(svgSize.Width, svgSize.Height);
        float  canvasMin = minSize   * multiplier;
        float  scale     = canvasMin / svgMax;
        var    matrix    = SKMatrix.CreateScale(scale, scale);
        var    bitmap    = new SKBitmap((int)(svgSize.Width * scale), (int)(svgSize.Height * scale));
        var    canvas    = new SKCanvas(bitmap);
        canvas.Clear();
        canvas.DrawPicture(svg.Picture, ref matrix);
        canvas.Flush();
        var    image = SKImage.FromBitmap(bitmap);
        SKData data  = image.Encode(skFormat, 100);
        data.SaveTo(outStream);
    }

    // TODO: Reduce code duplication
    public static void RenderCompanyLogo(Guid guid, Stream svgStream, string wwwroot)
    {
        SKSvg svg = null;

        foreach(int minSize in new[]
                {
                    256, 32
                })
        {
            foreach(string format in new[]
                    {
                        "png", "webp"
                    })
            {
                string outDir = minSize == 32
                                    ? Path.Combine(wwwroot, "assets/logos/thumbs", format)
                                    : Path.Combine(wwwroot, "assets/logos",        format);

                if(!Directory.Exists(outDir)) Directory.CreateDirectory(outDir);

                SKEncodedImageFormat skFormat;

                switch(format)
                {
                    case "webp":
                        skFormat = SKEncodedImageFormat.Webp;

                        break;
                    default:
                        skFormat = SKEncodedImageFormat.Png;

                        break;
                }

                foreach(int multiplier in new[]
                        {
                            1, 2, 3
                        })
                {
                    string outPath = Path.Combine(outDir, $"{multiplier}x");

                    if(!Directory.Exists(outPath)) Directory.CreateDirectory(outPath);

                    string rendered = Path.Combine(outPath, $"{guid}.{format}");

                    if(File.Exists(rendered)) continue;

                    Console.WriteLine("Rendering {0}", rendered);

                    if(svg == null)
                    {
                        svg = new SKSvg();
                        svg.Load(svgStream);
                    }

                    var outFs = new FileStream(rendered, FileMode.CreateNew);
                    RenderSvg(svg, outFs, skFormat, minSize, multiplier);
                    outFs.Close();
                }
            }
        }
    }
}