/*
 * 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;
using NUnit.Framework;
using QuantConnect.Indicators;

namespace QuantConnect.Tests.Indicators
{
    [TestFixture]
    public class FunctionalIndicatorTests
    {
        [Test]
        public void ComputesDelegateCorrectly()
        {
            var func = new FunctionalIndicator<IndicatorDataPoint>("f", data => data.Value, @this => @this.Samples > 1, () => {/*no reset action required*/});
            func.Update(DateTime.Today, 1m);
            Assert.IsFalse(func.IsReady);
            Assert.AreEqual(1m, func.Current.Value);

            func.Update(DateTime.Today.AddSeconds(1), 2m);
            Assert.IsTrue(func.IsReady);
            Assert.AreEqual(2m, func.Current.Value);
        }

        [Test]
        public void ResetsProperly()
        {
            var inner = new SimpleMovingAverage(2);
            var func = new FunctionalIndicator<IndicatorDataPoint>("f", data =>
            {
                inner.Update(data);
                return inner.Current.Value*2;
            },
            @this => inner.IsReady,
            () => inner.Reset()
            );

            func.Update(DateTime.Today, 1m);
            func.Update(DateTime.Today.AddSeconds(1), 2m);
            Assert.IsTrue(func.IsReady);

            func.Reset();
            TestHelper.AssertIndicatorIsInDefaultState(inner);
            TestHelper.AssertIndicatorIsInDefaultState(func);
        }
    }
}