using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Cobilas.IO.Serialization.Binary {
    /// <summary>Base sketch object.</summary>
    [Serializable]
    public abstract class ScratchObject {
        /// <summary>Draft name.</summary>
        public abstract string Name { get; }

        /// <summary>Downloads draft object to a file.</summary>
        /// <param name="scratch">Scratch object.</param>
        /// <param name="filePath">Path of the file where the object will be downloaded.</param>
        public static void UnloadScratchObject(ScratchObject scratch, string filePath) {
            BinaryFormatter formatter = new BinaryFormatter();
            using (FileStream stream = File.Create(filePath))
                formatter.Serialize(stream, scratch);
        }

        /// <summary>Downloads draft object to a file.</summary>
        /// <param name="scratch">Scratch object.</param>
        /// <param name="folderPath">Path of the directory where the file will be created.</param>
        /// <param name="name">File name.</param>
        /// <param name="extension">File extension.</param>
        public static void UnloadScratchObject(ScratchObject scratch, string folderPath, string name, string extension = "sobj")
            => UnloadScratchObject(scratch, Path.ChangeExtension(Path.Combine(folderPath, name), extension));

        /// <summary>Downloads draft object to a file.</summary>
        /// <param name="scratch">Scratch object.</param>
        /// <param name="folderPath">Path of the directory where the file will be created.</param>
        /// <param name="extension">File extension.</param>
        public static void UnloadScratchObject(ScratchObject scratch, string folderPath, string extension = "sobj")
            => UnloadScratchObject(scratch, folderPath, scratch.Name, extension);

        /// <summary>Loads an object <see cref="ScratchObject"/> from a file.</summary>
        /// <param name="filePath">File path.</param>
        public static ScratchObject LoadScratchObject(string filePath) {
            BinaryFormatter formatter = new BinaryFormatter();
            using (FileStream stream = File.OpenRead(filePath))
                return (ScratchObject)formatter.Deserialize(stream);
        }
    }
}