/*
 * 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 System.Collections.Generic;
using QuantConnect.Data;

namespace QuantConnect.ToolBox
{
    /// <summary>
    /// Data Downloader Interface for pulling data from a remote source.
    /// </summary>
    public interface IDataDownloader
    {
        /// <summary>
        /// Get historical data enumerable for a single symbol, type and resolution given this start and end time (in UTC).
        /// </summary>
        /// <param name="symbol">Symbol for the data we're looking for.</param>
        /// <param name="resolution">Resolution of the data request</param>
        /// <param name="startUtc">Start time of the data in UTC</param>
        /// <param name="endUtc">End time of the data in UTC</param>
        /// <returns>Enumerable of base data for this symbol</returns>
        IEnumerable<BaseData> Get(Symbol symbol, Resolution resolution, DateTime startUtc, DateTime endUtc);
    }
}