using System;
using System.Reflection;
using Semver;

namespace Umbraco.ModelsBuilder.Embedded
{
    /// <summary>
    /// Manages API version handshake between client and server.
    /// </summary>
    public class ApiVersion
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ApiVersion"/> class.
        /// </summary>
        /// <param name="executingVersion">The currently executing version.</param>
        /// <exception cref="ArgumentNullException"></exception>
        internal ApiVersion(SemVersion executingVersion)
        {
            Version = executingVersion ?? throw new ArgumentNullException(nameof(executingVersion));
        }

        private static SemVersion CurrentAssemblyVersion
            => SemVersion.Parse(Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyInformationalVersionAttribute>().InformationalVersion);

        /// <summary>
        /// Gets the currently executing API version.
        /// </summary>
        public static ApiVersion Current { get; }
            = new ApiVersion(CurrentAssemblyVersion);

        /// <summary>
        /// Gets the executing version of the API.
        /// </summary>
        public SemVersion Version { get; }
    }
}