using System;
using System.Collections.Generic;
using Kreta.Enums.ManualEnums.SystemSettings;

namespace Kreta.BusinessLogic.Logic.SystemSettings
{
    public static class SystemSettingsLogic
    {
        public static long MaxFileSizeMB { get; } = 4;
        public static long AllowedMaxHeight { get; } = 140;
        public static long AllowedMaxWidth { get; } = 980;

        private static Dictionary<string, string> allowedFileTypes =
        new Dictionary<string, string>() {
            { ".bmp", "image/bmp" },
            { ".jpg", "image/jpeg" },
            { ".jpeg", "image/jpeg" },
            { ".png", "image/png" },
        };

        public static SystemSettingsFejlecLablecSzerkesztoHibakEnum ImageValidate(string content)
        {
            var sumLength = 0;
            var sumWidth = 0;
            var maxHeight = 0;
            var imgTags = System.Text.RegularExpressions.Regex.Matches(content, "<img(.*?)src=\"(?<src>(.*?))\"(.*?)/>");
            foreach (System.Text.RegularExpressions.Match imgTag in imgTags)
            {
                var group = imgTag.Groups["src"];
                if (group.Success)
                {
                    string[] parts = group.Value.Split(new string[] { ";", ":", "," }, StringSplitOptions.None);
                    if (!allowedFileTypes.ContainsValue(parts[1]))
                    {
                        return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AFajlKiterjeszteseVagyTipusaNemMegfelelo;
                    }
                    var bytes = Convert.FromBase64String(parts[3]);
                    sumLength += bytes.Length;
                    using (System.Drawing.Image image = System.Drawing.Image.FromStream(new System.IO.MemoryStream(bytes)))
                    {
                        maxHeight = Math.Max(maxHeight, image.Height);
                        sumWidth += image.Width;
                    }
                }
            }
            if (sumLength > (MaxFileSizeMB * 1024 * 1024))
            {
                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.HibaTortentXMBNalNemLehetNagyobbAFajlMerete;
            }
            if (maxHeight > AllowedMaxHeight)
            {
                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AKepMagassagaMeghaladjaAMegengedettMeretet;
            }
            if (sumWidth > AllowedMaxWidth)
            {
                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AzOsszesKepSzelessegeMeghaladjaAMegengedettMeretet;
            }
            return 0;
        }
    }
}