using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;

using Packager.Parameters;

namespace Packager.Tasks
{
    [DisplayName("Extract Common Files")]
    public class ExtractCommon: Task
    {
        [Input("File Lists", IOCardinality.Multi, IOType.File)]
        public List<string> FileLists { get; set; }

        [Output("Common Files List", IOType.File)]
        public List<string> CommonFilesList = new List<string>();

        public ExtractCommon()
        {
            FileLists = new List<string>();
        }

        protected override void StartInternal(BuildConfiguration profile, cookerWrapper cooker, TaskIO inputs, string outputFolder)
        {
            IEnumerable<string> commonList = null;
            foreach (var file in inputs["FileLists"])
            {
                var list = File.ReadAllLines(file);

                commonList = commonList?.Intersect(list) ?? list;
            }

            var commonName = Path.Combine(outputFolder, "common.txt");
            if (commonList != null) File.WriteAllLines(commonName, commonList);
            CommonFilesList.Add(commonName);

            //OnFinished(0);
        }
    }
}