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

namespace Ubisoft
{
    public static class HtSystemCollections
    {
        public static string CollectionToString<T>(this IEnumerable<T> collection, string separator = ", ")
        {
            if (collection != null)
            {
                StringBuilder sb = new StringBuilder();
                int i = 0;
                foreach (T item in collection)
                {
                    if (item != null)
                    {
                        if (i > 0)
                        {
                            _ = sb.Append(separator);
                        }

                        _ = sb.Append(item.ToString());

                        i++;
                    }
                }

                return sb.ToString();
            }
            else
            {
                return "";
            }
        }

        public static bool AddRange<T>(this List<T> source, List<T> items, bool avoidDuplicates = false)
        {
            bool allAdded = true;

            if (items != null)
            {
                int count = items.Count;
                for (int i = 0; i < count; ++i)
                {
                    if (!avoidDuplicates || !source.Contains(items[i]))
                    {
                        source.Add(items[i]);
                    }
                    else
                    {
                        allAdded = false;
                    }
                }
            }

            return allAdded;
        }

        public static bool AddRange<T>(this SortedSet<T> source, IEnumerable<T> items)
        {
            bool allAdded = true;
            foreach (T item in items)
            {
                allAdded &= source.Add(item);
            }
            return allAdded;
        }

        public static bool AddRange<T>(this HashSet<T> source, IEnumerable<T> items)
        {
            bool allAdded = true;
            foreach (T item in items)
            {
                allAdded &= source.Add(item);
            }
            return allAdded;
        }

        public static int IndexOf<T>(this IReadOnlyList<T> self, T elementToFind)
        {
            int i = 0;
            foreach (T element in self)
            {
                if (Equals(element, elementToFind))
                {
                    return i;
                }

                i++;
            }
            return -1;
        }
    }
}