/*
 * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

using System;

namespace QuantConnect.Util
{
    /// <summary>
    /// Utility Comparison Operator class
    /// </summary>
    public static class ComparisonOperator
    {
        /// <summary>
        /// Compares two values using given operator
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="op">Comparison operator</param>
        /// <param name="arg1">The first value</param>
        /// <param name="arg2">The second value</param>
        /// <returns>Returns true if its left-hand operand meets the operator value to its right-hand operand, false otherwise</returns>
        public static bool Compare<T>(ComparisonOperatorTypes op, T arg1, T arg2) where T : IComparable
        {
            switch (op)
            {
                case ComparisonOperatorTypes.Equals:
                    return arg1.CompareTo(arg2) == 0;
                case ComparisonOperatorTypes.NotEqual:
                    return arg1.CompareTo(arg2) != 0;
                case ComparisonOperatorTypes.Greater:
                    return arg1.CompareTo(arg2) == 1;
                case ComparisonOperatorTypes.GreaterOrEqual:
                    return arg1.CompareTo(arg2) >= 0;
                case ComparisonOperatorTypes.Less:
                    return arg1.CompareTo(arg2) == -1;
                case ComparisonOperatorTypes.LessOrEqual:
                    return arg1.CompareTo(arg2) <= 0;
                default:
                    throw new ArgumentOutOfRangeException(nameof(op), $"Operator '{op}' is not supported.");
            }
        }
    }
}