using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PEP_Tool
{
    public static class Helper
    {
        public static string RemoveSpecialCharacters(string str)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char c in str)
            {
                if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_')
                {
                    sb.Append(c);
                }
            }
            return sb.ToString();
        }

        public static bool keyIsSpecialKey(System.Windows.Input.Key key)
        {
            var b = false;

            if (key == System.Windows.Input.Key.Escape || key == System.Windows.Input.Key.Tab ||
                key == System.Windows.Input.Key.CapsLock || key == System.Windows.Input.Key.LWin ||
                key == System.Windows.Input.Key.Left || key == System.Windows.Input.Key.Up ||
                key == System.Windows.Input.Key.Down || key == System.Windows.Input.Key.Right ||
                key == System.Windows.Input.Key.End || key == System.Windows.Input.Key.Home ||
                key == System.Windows.Input.Key.PageUp || key == System.Windows.Input.Key.PageDown ||
                key == System.Windows.Input.Key.PrintScreen || key == System.Windows.Input.Key.Print ||
                (key >= System.Windows.Input.Key.F1 && key <= System.Windows.Input.Key.LaunchApplication2) ||
                key == System.Windows.Input.Key.System || key == System.Windows.Input.Key.Play)
                b = true;
            else
                b = false; // the key will sappressed

            return b;
        }

        public static bool isTelNumber(System.Windows.Input.Key Char)
        {
            return ((Char >= System.Windows.Input.Key.D0 && Char <= System.Windows.Input.Key.D9) ||
                (Char >= System.Windows.Input.Key.NumPad0 && Char <= System.Windows.Input.Key.NumPad9) ||
                (Char == System.Windows.Input.Key.Delete ||
                Char == System.Windows.Input.Key.Divide ||
                Char == System.Windows.Input.Key.Space ||
                Char == System.Windows.Input.Key.Back ||
                Char == System.Windows.Input.Key.Add));
        }



        public static bool IsBase64String(this string s)
        {
            s = s.Trim();
            return (s.Length % 4 == 0) && System.Text.RegularExpressions.Regex.IsMatch(s, @"^[a-zA-Z0-9\+/]*={0,3}$", System.Text.RegularExpressions.RegexOptions.None);
        }


        public static T FindVisualChild<T>(System.Windows.DependencyObject depObj) where T : System.Windows.DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < System.Windows.Media.VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    System.Windows.DependencyObject child = System.Windows.Media.VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T)
                    {
                        return (T)child;
                    }

                    T childItem = FindVisualChild<T>(child);
                    if (childItem != null) return childItem;
                }
            }
            return null;
        }


        public static int IndexOfNth(this string str, string value, int nth = 1)
        {
            if (nth <= 0)
                throw new ArgumentException("Can not find the zeroth index of substring in string. Must start with 1");
            int offset = str.IndexOf(value);
            for (int i = 1; i < nth; i++)
            {
                if (offset == -1) return -1;
                offset = str.IndexOf(value, offset + 1);
            }
            return offset;
        }

        public static int CountSubstring(this string text, string value)
        {
            int count = 0, minIndex = text.IndexOf(value, 0);
            while (minIndex != -1)
            {
                minIndex = text.IndexOf(value, minIndex + value.Length);
                count++;
            }
            return count;
        }

        public static string AddLineNumbers(this string text, int startLine = 1)
        {
            var i = text.CountSubstring("\n");
            var strArr = text.Split("\n".ToCharArray());

            for(var j = startLine; j <= i; j++)
            {
                strArr[j] = $"{j - startLine + 1}. " + strArr[j].TrimStart("1234567890. ".ToCharArray());
            }

            text = string.Join("\n", strArr);
            return text;
        }
    }

    public class ReplaceDotConverter : System.Windows.Data.IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value != null)
            {
                string original = value.ToString();
                return original.Replace("l, ", "");
            }
            else return "";
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}