using System.Collections.Generic;
using Upsilon.BaseTypes;
using Upsilon.BaseTypes.ScriptTable;
using Upsilon.BaseTypes.ScriptTypeInterfaces;
using Upsilon.BaseTypes.UserData;
using Upsilon.Text;

namespace Upsilon.StandardLibraries
{
    internal class ListLibrary
    {
        [ScriptFunction("contains", "Returns a boolean that defines whether a table contains a value", directScriptManipulation: true)]
        public ScriptBoolean Contains(IIterable table, ScriptType obj)
        {
            return table.Contains(obj);
        }

        [ScriptFunction("remove", "Removes an object from a table.", directScriptManipulation: true)]
        public void Remove(ListUserData userList, ScriptType obj)
        {
            userList.List.Remove(obj);
        }

        [ScriptFunction("remove", "Removes an object from a table.", directScriptManipulation: true)]
        public void Remove(NumeratedScriptTable scriptTable, ScriptType obj)
        {
            var enumerator = scriptTable.GetEnumerator();
            var toRemove = new List<int>();
            var i = 1;
            while (enumerator.MoveNext())
            {
                var current = enumerator.Current;
                if (current == obj)
                    toRemove.Add(i);
                i++;
            }
            enumerator.Dispose();
            foreach (var index in toRemove)
            {
                scriptTable.Set(null, new TextSpan(), index.ToScriptType(), new ScriptNull());
            }
        }
    }
}