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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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using System;
using System.Collections.Generic;
using Org.Apache.REEF.IO.PartitionedData.FileSystem.Parameters;
using Org.Apache.REEF.IO.PartitionedData.Random.Parameters;
using Org.Apache.REEF.Tang.Implementations.Configuration;
using Org.Apache.REEF.Tang.Implementations.Tang;
using Org.Apache.REEF.Tang.Interface;
using Org.Apache.REEF.Tang.Util;

namespace Org.Apache.REEF.IO.PartitionedData.FileSystem
{
    internal sealed class FileInputPartitionDescriptor<T> : IPartitionDescriptor
    {
        private readonly string _id;
        private readonly IList<string> _filePaths;
        private readonly IConfiguration _filePartitionDeserializerConfig;
        private readonly bool _copyToLocal;

        internal FileInputPartitionDescriptor(string id, IList<string> filePaths, bool copyToLocal, IConfiguration filePartitionDeserializerConfig)
        {
            _id = id;
            _filePaths = filePaths;
            _copyToLocal = copyToLocal;
            _filePartitionDeserializerConfig = filePartitionDeserializerConfig;
        }

        public string Id
        {
            get { return _id; }
        }

        /// <summary>
        /// This method is to provide Configurations required to inject the corresponding IInputPartition. 
        /// </summary>
        /// <returns></returns>
        public IConfiguration GetPartitionConfiguration()
        {
            var builder = TangFactory.GetTang().NewConfigurationBuilder()
                .BindImplementation(GenericType<IInputPartition<T>>.Class, GenericType<FileSystemInputPartition<T>>.Class)
                .BindNamedParameter<CopyToLocal, bool>(GenericType<CopyToLocal>.Class, _copyToLocal.ToString())
                .BindStringNamedParam<PartitionId>(_id);

            foreach (string p in _filePaths)
            {
                builder = builder.BindSetEntry<FilePathsInInputPartition, string>(GenericType<FilePathsInInputPartition>.Class, p);
            }

            return Configurations.Merge(builder.Build(), _filePartitionDeserializerConfig);
        }
    }
}