using System.Collections.Generic;
using System.IO;
using System.Linq;
using JD.Core.ProjectManaging;
using Packager.Parameters;

namespace Packager.Tasks
{
    /// <summary>
    /// Output: all the common textures that can be used in a capture.
    /// </summary>
    public class AddAdditionalCapturesDependenciesTask : Task
    {
        private static readonly string[] TexturesExtensions = { ".png", ".tga" };

        [Output("Dependencies File", IOType.File)]
        public ReferenceList DependenciesFile = new ReferenceList();

        protected override void StartInternal(BuildConfiguration profile, cookerWrapper cooker)
        {
            var directories = new [] { DataPath.GetAbsolutePath(@"EngineData"),  DataPath.GetAbsolutePath(@"World/_COMMON"), DataPath.GetAbsolutePath(@"World/ui") };

            var textures = directories.SelectMany(GetFilesInDirectory)
                                      .Where(IsATexture)
                                      .Select(DataPath.GetRelativePath);

            var outputFile = Path.Combine(TaskOutputFolder, "CommonTextures.txt");
            File.AppendAllLines(outputFile, textures);
            DependenciesFile.Add(outputFile);
        }

        private bool IsATexture(string fileName)
        {
            return TexturesExtensions.Any(fileName.EndsWith);
        }

        private IEnumerable<string> GetFilesInDirectory(string directory)
        {
            return Directory.GetFiles(directory, "*.*", SearchOption.AllDirectories);
        }
    }
}