using System;
using System.Collections.Concurrent;
using System.IO;
using System.Text;
using QuestPDF.Fluent;
using QuestPDF.Infrastructure;
using SkiaSharp;

namespace QuestPDF.ReportSample
{
    public static class Helpers
    {
        public static Random Random { get; } = new Random();
        
        public static string GetTestItem(string path) => Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resources", path);

        public static byte[] GetImage(string name)
        {
            var photoPath = GetTestItem(name);
            return SKImage.FromEncodedData(photoPath).EncodedData.ToArray();
        }

        public static Location RandomLocation()
        {
            return new Location
            {
                Longitude = Helpers.Random.NextDouble() * 360f - 180f,
                Latitude = Helpers.Random.NextDouble() * 180f - 90f
            };
        }

        private static readonly ConcurrentDictionary<int, string> RomanNumeralCache = new ConcurrentDictionary<int, string>();

        public static string FormatAsRomanNumeral(this int number)
        {
            if (number < 0 || number > 3999) 
                throw new ArgumentOutOfRangeException(nameof(number), "Number should be in range from 1 to 3999");
            
            return RomanNumeralCache.GetOrAdd(number, x =>
            {
                if (x >= 1000) return "M" + FormatAsRomanNumeral(x - 1000);
                if (x >= 900) return "CM" + FormatAsRomanNumeral(x - 900); 
                if (x >= 500) return "D" + FormatAsRomanNumeral(x - 500);
                if (x >= 400) return "CD" + FormatAsRomanNumeral(x - 400);
                if (x >= 100) return "C" + FormatAsRomanNumeral(x - 100);            
                if (x >= 90) return "XC" + FormatAsRomanNumeral(x - 90);
                if (x >= 50) return "L" + FormatAsRomanNumeral(x - 50);
                if (x >= 40) return "XL" + FormatAsRomanNumeral(x - 40);
                if (x >= 10) return "X" + FormatAsRomanNumeral(x - 10);
                if (x >= 9) return "IX" + FormatAsRomanNumeral(x - 9);
                if (x >= 5) return "V" + FormatAsRomanNumeral(x - 5);
                if (x >= 4) return "IV" + FormatAsRomanNumeral(x - 4);
                if (x >= 1) return "I" + FormatAsRomanNumeral(x - 1);
                
                return string.Empty;  
            });
        }
        
        public static void SkiaSharpCanvas(this IContainer container, Action<SKCanvas, Size> drawOnCanvas)
        {
            container.Svg(size =>
            {
                using var stream = new MemoryStream();

                using (var canvas = SKSvgCanvas.Create(new SKRect(0, 0, size.Width, size.Height), stream))
                    drawOnCanvas(canvas, size);
            
                var svgData = stream.ToArray();
                return Encoding.UTF8.GetString(svgData);
            });
        }
        
        public static void SkiaSharpRasterized(this IContainer container, Action<SKCanvas, Size> drawOnCanvas)
        {
            container.Image(payload =>
            {
                using var bitmap = new SKBitmap(payload.ImageSize.Width, payload.ImageSize.Height);

                using (var canvas = new SKCanvas(bitmap))
                {
                    var scalingFactor = payload.Dpi / (float)DocumentSettings.DefaultRasterDpi;
                    canvas.Scale(scalingFactor);
                    drawOnCanvas(canvas, payload.AvailableSpace);
                }
                
                return bitmap.Encode(SKEncodedImageFormat.Png, 100).ToArray();
            });
        }
    }
}