using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace CoreWebLibrary.Text.RegularExpressions
{
    /// <summary>
    /// A utility class containing frequently used Regular Expression Patterns
    /// and two utility methods to see if a passed string conforms to the designated 
    /// pattern.
    /// </summary>
    public class Patterns
    {
     
      public const string EMAIL = @"^([0-9a-zA-Z]+[-._+&])*[0-9a-zA-Z]+@([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,6}$" ;

      public const string US_ZIPCODE = @"^\d{5}$" ;
      public const string US_ZIPCODE_PLUS_FOUR = @"^\d{5}((-|\s)?\d{4})$";
      public const string US_ZIPCODE_PLUS_FOUR_OPTIONAL = @"^\d{5}((-|\s)?\d{4})?$" ;

      /// <summary>
      /// Permissive US Telephone Regex. Does not allow extensions.
      /// </summary>
      /// <example>
      /// Allows: 324-234-3433, 3242343434, (234)234-234, (234) 234-2343
      /// </example>
      public const string US_TELEPHONE = @"^([\(]{1}[0-9]{3}[\)]{1}[\.| |\-]{0,1}|^[0-9]{3}[\.|\-| ]?)?[0-9]{3}(\.|\-| )?[0-9]{4}$";

      /// <summary>
      /// This matches a url in the generic format 
      /// scheme://authority/path?query#fragment
      /// </summary>
      /// <example>
      /// Allows: http://www.yahoo.com, https://www.yahoo.com, ftp://www.yahoo.com
      /// </example>
      public const string URL = @"^(?<Protocol>\w+):\/\/(?<Domain>[\w.]+\/?)\S*$";

      /// <summary>
      /// This matches an ip address in the format xxx-xxx-xxx-xxx
      /// each group of xxx must be less than or equal to 255
      /// </summary>
      /// <example>
      /// Allows: 123.123.123.123, 192.168.1.1
      /// </example>
      public const string IP_ADDRESS = @"^(?<First>2[0-4]\d|25[0-5]|[01]?\d\d?)\.(?<Second>2[0-4]\d|25[0-5]|[01]?\d\d?)\.(?<Third>2[0-4]\d|25[0-5]|[01]?\d\d?)\.(?<Fourth>2[0-4]\d|25[0-5]|[01]?\d\d?)$";

      /// <summary>
      /// This matches a date in the format mm/dd/yy
      /// </summary>
      /// <example>
      /// Allows: 01/05/05, 12/30/99, 04/11/05
      /// Does not allow: 01/05/2000, 2/2/02
      /// </example> 
      public const string DATE_MM_DD_YY = @"^(1[0-2]|0[1-9])/(([1-2][0-9]|3[0-1]|0[1-9])/\d\d)$"; 


      /// <summary>
      /// This matches a date in the format mm/yy
      /// </summary>
      /// <example>
      /// Allows: 01/05, 11/05, 04/99
      /// Does not allow: 1/05, 13/05, 00/05
      /// </example>
      public const string DATE_MM_YY = @"^((0[1-9])|(1[0-2]))\/(\d{2})$";

      
      /// <summary>
      ///     This matches only numbers(no decimals)
      /// </summary>
      /// <example>
      /// Allows: 0, 1, 123, 4232323, 1212322
      /// </example>
      public const string IS_NUMBER_ONLY = @"^([1-9]\d*)$|^0$";
     
      /// <summary>
      /// This matches any string with only alpha characters upper or lower case(A-Z)
      /// </summary>
      /// <example>
      /// Allows: abc, ABC, abCd, AbCd
      /// Does not allow: A C, abc!, (a,b)
      /// </example>
      public const string IS_ALPHA_ONLY = @"^[a-zA-Z]+$"; 

      /// <summary>
      /// This matches any string with only upper case alpha character(A-Z)
      /// </summary>
      public const string IS_UPPER_CASE = @"^[A-Z]+$";
      
      /// <summary>
      /// This matches any string with only lower case alpha character(A-Z)
      /// </summary>
      public const string IS_LOWER_CASE = @"^[a-z]+$";
      
      /// <summary>
      /// Ensures the string only contains alpha-numeric characters, and
      /// not punctuation, spaces, line breaks, etc.
      /// </summary>
      /// <example>
      /// Allows: ab2c, 112ABC, ab23Cd
      /// Does not allow: A C, abc!, a.a
      /// </example>
      public const string IS_ALPHA_NUMBER_ONLY = @"^[a-zA-Z0-9]+$";

      /// <summary>
      /// Validates US Currency.  Requires $ sign
      /// Allows for optional commas and decimal. 
      /// No leading zeros. 
      /// </summary>
      /// <example>Allows: $100,000 or $10000.00 or $10.00 or $.10 or $0 or $0.00
      /// Does not allow: $0.10 or 10.00 or 10,000</example>
      public const string IS_US_CURRENCY = @"^\$(([1-9]\d*|([1-9]\d{0,2}(\,\d{3})*))(\.\d{1,2})?|(\.\d{1,2}))$|^\$[0](.00)?$";

      /// <summary>
      /// Matches major credit cards including: Visa (length 16, prefix 4); 
      /// Mastercard (length 16, prefix 51-55);
      /// Diners Club/Carte Blanche (length 14, prefix 36, 38, or 300-305); 
      /// Discover (length 16, prefix 6011); 
      /// American Express (length 15, prefix 34 or 37). 
      /// Saves the card type as a named group to facilitate further validation 
      /// against a "card type" checkbox in a program. 
      /// All 16 digit formats are grouped 4-4-4-4 with an optional hyphen or space 
      /// between each group of 4 digits. 
      /// The American Express format is grouped 4-6-5 with an optional hyphen or space 
      /// between each group of digits. 
      /// Formatting characters must be consistant, i.e. if two groups are separated by a hyphen, 
      /// all groups must be separated by a hyphen for a match to occur.
      /// </summary>
      public const string CREDIT_CARD = @"^(?:(?<Visa>4\d{3})|(?<Mastercard>5[1-5]\d{2})|(?<Discover>6011)|(?<DinersClub>(?:3[68]\d{2})|(?:30[0-5]\d))|(?<AmericanExpress>3[47]\d{2}))([ -]?)(?(DinersClub)(?:\d{6}\1\d{4})|(?(AmericanExpress)(?:\d{6}\1\d{5})|(?:\d{4}\1\d{4}\1\d{4})))$";

      /// <summary>
      /// Matches social security in the following format xxx-xx-xxxx
      /// where x is a number
      /// </summary>
      /// <example>
      /// Allows: 123-45-6789, 232-432-1212
      /// </example>
      public const string SOCIAL_SECURITY = @"^\d{3}-\d{2}-\d{4}$";

      /// <summary>
      /// Matches x,x where x is a name, spaces are only allowed between comma and name
      /// </summary>
      /// <example>
      /// Allows: christophersen,eric; christophersen, eric
      /// Not allowed: christophersen ,eric;
      /// </example>
      public const string NAME_COMMA_NAME = @"^[a-zA-Z]+,\s?[a-zA-Z]+$";
        
      private Patterns()
      {
      }

      /// <summary>
      /// Checks to see if the passed input has the passed pattern
      /// </summary>
      /// <param name="pattern">The pattern to use</param>
      /// <param name="input">The input to check</param>
      /// <returns>True if the input has the pattern, false otherwise</returns>
      public static bool HasPattern( string pattern, string input )
      {
         Regex regEx = new Regex(pattern);
         return regEx.IsMatch(input);
      }

      /// <summary>
      /// Checks the passed input to make sure it has all the patterns in the 
      /// passed patterns array
      /// </summary>
      /// <param name="patterns">Array of patterns</param>
      /// <param name="input">String value to check</param>
      /// <returns>True if the input has all of the patterns, false otherwise.</returns>
      public static bool HasPatterns(string[] patterns, string input)
      {
         for (int i = 0; i < patterns.Length; i++)
         {
          if (Patterns.HasPattern(patterns[i], input) == false)
              return false;
         }

         return true;
      }
    }
}