using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

public static class GlobalClass
{
    public static IServiceProvider ServiceProvider;
    public static bool isURL(string url)
    {
        return Uri.IsWellFormedUriString(url, UriKind.Absolute);
    }

    public static string GetIP(this HttpContext context)
    {

        var ip = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
        if (string.IsNullOrEmpty(ip))
        {
            ip = context.Connection.RemoteIpAddress.ToString();
        }
        return ip;
    }

    public static string CreateRandomCode(int Number)
    {
        string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
        string[] allCharArray = allChar.Split(',');
        string randomCode = "";

        Random rand = new Random(Guid.NewGuid().GetHashCode());
        for (int i = 0; i <= Number - 1; i++)
        {
            int t = rand.Next(allCharArray.Length);
            randomCode += allCharArray[t];
        }
        return randomCode;
    }

    public static string CreateUniRandomCode(int Number)
    {
        string allChar = "2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
        string[] allCharArray = allChar.Split(',');
        string randomCode = "";

        Random rand = new Random(Guid.NewGuid().GetHashCode());
        for (int i = 0; i <= Number - 1; i++)
        {
            int t = rand.Next(allCharArray.Length);
            randomCode += allCharArray[t];
        }
        return randomCode;
    }

    public static string ToMD5(this string str)
    {
        using (var cryptoMD5 = System.Security.Cryptography.MD5.Create())
        {
            //將字串編碼成 UTF8 位元組陣列
            var bytes = Encoding.UTF8.GetBytes(str);

            //取得雜湊值位元組陣列
            var hash = cryptoMD5.ComputeHash(bytes);

            //取得 MD5
            var md5 = BitConverter.ToString(hash)
              .Replace("-", String.Empty)
              .ToLower();

            return md5;
        }
    }

    public static string Sha256(this string input)
    {
        System.Security.Cryptography.SHA256CryptoServiceProvider sha256 = new SHA256CryptoServiceProvider();
        Byte[] ByteString = Encoding.ASCII.GetBytes(input);
        ByteString = sha256.ComputeHash(ByteString);
        string returnString = "";
        foreach (Byte bt in ByteString)
        {
            returnString += bt.ToString("x2");
        }
        return returnString.ToLower();
    }
    /// <summary>
    /// Creates a SHA256 hash of the specified input.
    /// </summary>
    /// <param name="input">The input.</param>
    /// <returns>A hash.</returns>
    public static byte[] Sha256(this byte[] input)
    {
        if (input == null)
        {
            return null;
        }
        using (var sha = SHA256.Create())
        {
            return sha.ComputeHash(input);
        }
    }

    public static bool isEmail(string email)
    {
        //Email檢查格式
        System.Text.RegularExpressions.Regex EmailExpression = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$", RegexOptions.Compiled | RegexOptions.Singleline);
        try
        {
            if (string.IsNullOrEmpty(email))
            {
                return false;
            }
            else
            {
                return EmailExpression.IsMatch(email);
            }
        }
        catch (Exception ex)
        {
            //log.Error(ex.Message);
            return false;
        }
    }

    public static string appsettings(string key)
    {
        var builder = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory())
                    .AddJsonFile("appsettings.json");
        var config = builder.Build();
        return config[key];
    }

    public static Image embedImage(Image watermark, Image targetImg, int x, int y)
    {
        Image outImg;

        using (Graphics g = Graphics.FromImage(targetImg))
        {
            g.DrawImage(watermark, new Rectangle(x, y, watermark.Width, watermark.Height));
            outImg = (Image)targetImg.Clone();
        }

        return outImg;
    }

    public static Image resizeImage(Image image, int width, int height)
    {
        var destinationRect = new Rectangle(0, 0, width, height);
        var destinationImage = new Bitmap(width, height);

        destinationImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);

        using (var graphics = Graphics.FromImage(destinationImage))
        {
            graphics.CompositingMode = CompositingMode.SourceCopy;
            graphics.CompositingQuality = CompositingQuality.HighQuality;

            using (var wrapMode = new ImageAttributes())
            {
                wrapMode.SetWrapMode(WrapMode.TileFlipXY);
                graphics.DrawImage(image, destinationRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
            }
        }

        return (Image)destinationImage;
    }

    /// <summary>
    /// base 64字串格式的圖片轉成Image物件
    /// </summary>
    /// <param name="base64String"></param>
    /// <returns></returns>
    public static Image Base64StringToImage(string base64String)
    {
        // Convert base 64 string to byte[]
        byte[] Buffer = Convert.FromBase64String(base64String);

        byte[] data = null;
        Image oImage = null;
        MemoryStream oMemoryStream = null;
        Bitmap oBitmap = null;
        //建立副本
        data = (byte[])Buffer.Clone();
        try
        {
            oMemoryStream = new MemoryStream(data);
            //設定資料流位置
            oMemoryStream.Position = 0;
            oImage = System.Drawing.Image.FromStream(oMemoryStream);
            //建立副本
            oBitmap = new Bitmap(oImage);
        }
        catch
        {
            throw;
        }
        finally
        {
            oMemoryStream.Close();
            oMemoryStream.Dispose();
            oMemoryStream = null;
        }
        //return oImage;
        return oBitmap;
    }

    public static string ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format)
    {
        using (MemoryStream ms = new MemoryStream())
        {
            // Convert Image to byte[]
            image.Save(ms, format);
            byte[] imageBytes = ms.ToArray();

            // Convert byte[] to base 64 string
            string base64String = Convert.ToBase64String(imageBytes);
            return base64String;
        }
    }
}

/// <summary>
/// 日期转换为中文大写
/// </summary>
public class UpperConvert
{
    public UpperConvert()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    //把数字转换为大写
    public string numtoUpper(int num)
    {
        String str = num.ToString();
        string rstr = "";
        int n;
        for (int i = 0; i < str.Length; i++)
        {
            n = Convert.ToInt16(str[i].ToString());//char转数字,转换为字符串，再转数字
            switch (n)
            {
                case 0: rstr = rstr + "〇"; break;
                case 1: rstr = rstr + "一"; break;
                case 2: rstr = rstr + "二"; break;
                case 3: rstr = rstr + "三"; break;
                case 4: rstr = rstr + "四"; break;
                case 5: rstr = rstr + "五"; break;
                case 6: rstr = rstr + "六"; break;
                case 7: rstr = rstr + "七"; break;
                case 8: rstr = rstr + "八"; break;
                default: rstr = rstr + "九"; break;
            }

        }
        return rstr;
    }
    //月转化为大写
    public string monthtoUpper(int month)
    {
        if (month < 10)
        {
            return numtoUpper(month);
        }
        else
            if (month == 10) { return "十"; }

        else
        {
            return "十" + numtoUpper(month - 10);
        }
    }
    //日转化为大写
    public string daytoUpper(int day)
    {
        if (day < 20)
        {
            return monthtoUpper(day);
        }
        else
        {
            String str = day.ToString();
            if (str[1] == '0')
            {
                return numtoUpper(Convert.ToInt16(str[0].ToString())) + "十";
            }
            else
            {
                return numtoUpper(Convert.ToInt16(str[0].ToString())) + "十"
                    + numtoUpper(Convert.ToInt16(str[1].ToString()));
            }
        }
    }
    //日期转换为大写
    public string dateToUpper(System.DateTime date)
    {
        int year = date.Year;
        int month = date.Month;
        int day = date.Day;
        return numtoUpper(year) + "年" + monthtoUpper(month) + "月" + daytoUpper(day) + "日";

    }
}

public class ChtNumConverter
{
    public static string ChtNums = "零壹貳參肆伍陸柒捌玖";
    public static Dictionary<string, long> ChtUnits = new Dictionary<string, long>{
            {"拾", 10},
            {"佰", 100},
            {"千", 1000},
            {"萬", 10000},
            {"億", 100000000},
            {"兆", 1000000000000}
        };
    // 解析中文數字        
    public static long ParseChtNum(string chtNumString)
    {
        var isNegative = false;
        if (chtNumString.StartsWith("負"))
        {
            chtNumString = chtNumString.Substring(1);
            isNegative = true;
        }
        long num = 0;
        // 處理千百十範圍的四位數
        Func<string, long> Parse4Digits = (s) =>
        {
            long lastDigit = 0;
            long subNum = 0;
            foreach (var rawChar in s)
            {
                var c = rawChar.ToString().Replace("〇", "零");
                if (ChtNums.Contains(c))
                {
                    lastDigit = (long)ChtNums.IndexOf(c);
                }
                else if (ChtUnits.ContainsKey(c))
                {
                    if (c == "十" && lastDigit == 0) lastDigit = 1;
                    long unit = ChtUnits[c];
                    subNum += lastDigit * unit;
                    lastDigit = 0;
                }
                else
                {
                    throw new ArgumentException($"包含無法解析的中文數字：{c}");
                }
            }
            subNum += lastDigit;
            return subNum;
        };
        // 以兆億萬分割四位值個別解析
        foreach (var splitUnit in "兆億萬".ToArray())
        {
            var pos = chtNumString.IndexOf(splitUnit);
            if (pos == -1) continue;
            var subNumString = chtNumString.Substring(0, pos);
            chtNumString = chtNumString.Substring(pos + 1);
            num += Parse4Digits(subNumString) * ChtUnits[splitUnit.ToString()];
        }
        num += Parse4Digits(chtNumString);
        return isNegative ? -num : num;
    }
    // 轉換為中文數字
    public static string ToChtNum(long n)
    {
        var negtive = n < 0;
        if (negtive) n = -n;
        if (n >= 10000 * ChtUnits["兆"])
            throw new ArgumentException("數字超出可轉換範圍");
        var unitChars = "千佰拾".ToArray();
        // 處理 0000 ~ 9999 範圍數字
        Func<long, string> Conv4Digits = (subNum) =>
        {
            var sb = new StringBuilder();
            foreach (var c in unitChars)
            {
                if (subNum >= ChtUnits[c.ToString()])
                {
                    var digit = subNum / ChtUnits[c.ToString()];
                    subNum = subNum % ChtUnits[c.ToString()];
                    sb.Append($"{ChtNums[(int)digit]}{c}");
                }
                else sb.Append("零");
            }
            sb.Append(ChtNums[(int)subNum]);
            return sb.ToString();
        };
        var numString = new StringBuilder();
        var forceRun = false;
        foreach (var splitUnit in "兆億萬".ToArray())
        {
            var unit = ChtUnits[splitUnit.ToString()];
            if (n < unit)
            {
                if (forceRun) numString.Append("零");
                continue;
            }
            forceRun = true;
            var subNum = n / unit;
            n = n % unit;
            if (subNum > 0)
                numString.Append(Conv4Digits(subNum).TrimEnd('零') + splitUnit);
            else numString.Append("零");
        }
        numString.Append(Conv4Digits(n));
        var t = Regex.Replace(numString.ToString(), "[零]+", "零");
        if (t.Length > 1) t = t.Trim('零');
        t = Regex.Replace(t, "^壹拾", "拾");
        return (negtive ? "負" : string.Empty) + t;
    }
}