using System.Reflection;
using FrameworkDAL.DTO.Version;
using FrameworkDAL.CustomCode.Version;

namespace FrameworkBLL.Version
{
    public class VersionBLL : IVersionBLL
    {
        private readonly IVersionDAL _VersionDAL;

        public VersionBLL(IVersionDAL VersionDAL)
        {
            _VersionDAL = VersionDAL;
        }
        public async  Task<IEnumerable<VersionDTO>> VersionCheck(string ConnectionName)
        {
            try
            {
                return await _VersionDAL.VersionCheck(ConnectionName);
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<VersionUrlIdentifierDTO> VersionUrlIdentifier(string ConnectionName)
        {
            try
            {
                return await _VersionDAL.VersionUrlIdentifier(ConnectionName);
            }
            catch (Exception)
            {
                throw;
            }
        }

        // Reflects the actual compiled artifact, never a database row. No DAL round-trip:
        // build identity is process-wide, not tenant-scoped.
        //
        // GitSha comes from AssemblyInformationalVersion ("1.0.0+<40-char-sha>"), which the
        // .NET SDK itself stamps from the .git folder at build time (confirmed on SDK
        // 10.0.106 with no SourceLink package installed) — no custom git plumbing needed.
        // BuildTimestampUtc comes from the GB5BuildTimestampUtc AssemblyMetadata item added
        // by Directory.Build.props' GB5StampBuildIdentity target, since the SDK has no
        // built-in equivalent for a build timestamp.
        public BuildInfoDTO GetBuildInfo()
        {
            var assembly = typeof(VersionBLL).Assembly;

            var informationalVersion = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()
                ?.InformationalVersion;
            var plusIndex = informationalVersion?.IndexOf('+') ?? -1;
            var gitSha = plusIndex >= 0 ? informationalVersion![(plusIndex + 1)..] : "unknown";

            var buildTimestampUtc = assembly.GetCustomAttributes<AssemblyMetadataAttribute>()
                .FirstOrDefault(a => a.Key == "GB5BuildTimestampUtc")?.Value ?? "unknown";

            return new BuildInfoDTO
            {
                GitSha = gitSha,
                BuildTimestampUtc = buildTimestampUtc,
                ServiceName = Assembly.GetEntryAssembly()?.GetName().Name,
                HostMachineName = Environment.MachineName
            };
        }
    }
}