using System.IO;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;

namespace Image
{
    /// <summary>
    ///     OriginalFilenameFileOutputPathFormatter keeps the original file name of the image when formatting the new output
    ///     path.
    /// </summary>
    public class OriginalFilenameFileOutputPathFormatter : IFileOutputPathFormatter
    {
        public static ILogger Logger = NullLogger.Instance;
        private readonly string _outputDirectory;

        /// <summary>
        ///     Creates an instance of OriginalFilenameFileOutputPathFormatter.
        /// </summary>
        /// <param name="outputDirectory">The output directory.</param>
        public OriginalFilenameFileOutputPathFormatter(string outputDirectory)
        {
            if (!Directory.Exists(outputDirectory))
            {
                Logger.LogWarning("Output directory does not exists. Creating.");
                Directory.CreateDirectory(outputDirectory);
            }

            _outputDirectory = outputDirectory;
        }

        /// <summary>
        ///     Returns a path containing the file name in the output directory.
        /// </summary>
        /// <param name="initialFilePath">The initial path of the image.</param>
        /// <returns>An absolute path of the form output_directory/initialFileName.jpg</returns>
        public string GetOutputPath(string initialFilePath)
        {
            var fileName = Path.GetFileName(initialFilePath)?.Split(".")[0];
            var path = Path.Join(_outputDirectory, $"{fileName}.jpg");
            return path;
        }

        /// <summary>
        ///     Creates an instance of OriginalFilenameFileOutputPathFormatter.
        /// </summary>
        /// <param name="outputDirectory">The output directory.</param>
        public static OriginalFilenameFileOutputPathFormatter Create(string outputDirectory)
        {
            return new OriginalFilenameFileOutputPathFormatter(outputDirectory);
        }
    }
}