using System;
using System.Collections.Generic;

namespace Modbus.Utility
{
    /// <summary>
    /// String utility methods.
    /// </summary>
    public static class StringUtility
    {
        /// <summary>
        /// Concatenates a specified separator String between each element of a specified collection, 
        /// yielding a single concatenated string. 
        /// </summary>
        public static string Join<T>(string separator, ICollection<T> collection)
        {
            return Join(separator, collection, DefaultConversion);
        }

        /// <summary>
        /// Concatenates a specified separator String between each converted element of a specified collection, 
        /// yielding a single concatenated string. 
        /// </summary>
        public static string Join<T>(string separator, ICollection<T> collection, Converter<T, string> conversion)
        {
            if (collection == null)
                throw new ArgumentNullException("collection");

            if (conversion == null)
                throw new ArgumentNullException("conversion");

            return Join(separator, CollectionUtility.ToArray(collection), conversion);
        }

        /// <summary>
        /// Concatenates a specified separator String between each element of a specified array, 
        /// yielding a single concatenated string. 
        /// </summary>
        public static string Join<T>(string separator, T[] collection)
        {
            return Join(separator, collection, DefaultConversion);
        }

        /// <summary>
        /// Concatenates a specified separator String between each converted element of a specified array, 
        /// yielding a single concatenated string. 
        /// </summary>
        public static string Join<T>(string separator, T[] collection, Converter<T, string> conversion)
        {
            if (collection == null)
                throw new ArgumentNullException("collection");

            if (conversion == null)
                throw new ArgumentNullException("conversion");

            return String.Join(separator, Array.ConvertAll(collection, conversion));
        }

        private static string DefaultConversion<T>(T t)
        {
            return t.ToString();
        }
    }
}