using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace Foodsoft.Alpm
{
    public abstract class Package : IPackageData
    {
        internal SafePackageHandle Handle { get; }

        internal Package(SafePackageHandle handle)
        {
            Handle = handle;
        }

        public string Filename => alpm.alpm_pkg_get_filename(Handle);
        public string Base => alpm.alpm_pkg_get_base(Handle);
        public string Name => alpm.alpm_pkg_get_name(Handle);
        public string Version => alpm.alpm_pkg_get_version(Handle);
        public PackageOrigin Origin => alpm.alpm_pkg_get_origin(Handle);
        public string Description => alpm.alpm_pkg_get_desc(Handle);
        public string Url => alpm.alpm_pkg_get_url(Handle);

        public DateTimeOffset BuildDate => DateTimeOffset.FromUnixTimeSeconds(alpm.alpm_pkg_get_builddate(Handle));
        public DateTimeOffset InstallDate => DateTimeOffset.FromUnixTimeSeconds(alpm.alpm_pkg_get_installdate(Handle));
        public string Packager => alpm.alpm_pkg_get_packager(Handle);
        public string MD5Sum => alpm.alpm_pkg_get_md5sum(Handle);
        public string SHA256Sum => alpm.alpm_pkg_get_sha256sum(Handle);
        public string Arch => alpm.alpm_pkg_get_arch(Handle);
        public long Size => alpm.alpm_pkg_get_size(Handle);
        public long InstalledSize => alpm.alpm_pkg_get_isize(Handle);
        public InstallReason InstallReason => alpm.alpm_pkg_get_reason(Handle);

        public ICollection<string> Licenses =>
            EnumerableWrapperEx<string>.Create(Handle, alpm.alpm_pkg_get_licenses, Marshal.PtrToStringUTF8!);

        public ICollection<string> Groups { get; }
        public ICollection<Depend> Depends { get; }
        public ICollection<Depend> OptDepends { get; }
        public ICollection<Depend> CheckDepends { get; }
        public ICollection<Depend> MakeDepends { get; }
        public ICollection<Depend> Conflicts { get; }
        public ICollection<Depend> Provides { get; }
        public ICollection<Depend> Replaces { get; }
        public IReadOnlyList<File> FileList { get; }
        public IReadOnlyList<Backup> Backup { get; }
        public string Base64Signature { get; }
        public ValidationType Validation { get; }
        public bool HasScriptlet { get; }
        public long DownloadSize { get; }

        public bool CheckMD5Sum()
        {
            throw new NotImplementedException();
        }

        public virtual Database? DB => null;

        public IEnumerator<Package> ComputeRequiredBy()
        {
            throw new NotImplementedException();
        }

        public IEnumerator<Package> ComputeOptionalFor()
        {
            throw new NotImplementedException();
        }

        public void Dispose()
        {
            Handle.Dispose();
        }

        public static int VersionCompare(string v1, string v2)
        {
            return alpm.alpm_pkg_vercmp(v1, v2);
        }
    }
}