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 =>
            EnumerableWrapper.Create(Handle, alpm.alpm_pkg_get_licenses);
        public ICollection<string> Groups => EnumerableWrapper.Create(Handle, alpm.alpm_pkg_get_groups);
        public ICollection<Depend> Depends => EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_depends);
        public ICollection<Depend> OptDepends =>
            EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_optdepends);
        public ICollection<Depend> CheckDepends =>
            EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_checkdepends);
        public ICollection<Depend> MakeDepends =>
            EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_makedepends);
        public ICollection<Depend> Conflicts => EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_conflicts);
        public ICollection<Depend> Provides => EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_provides);
        public ICollection<Depend> Replaces => EnumerableWrapper.CreateForDepend(Handle, alpm.alpm_pkg_get_replaces);
        public IReadOnlyList<File> Files => new FileList(Handle, alpm.alpm_pkg_get_files(Handle));
        public ICollection<Backup> Backup => EnumerableWrapper.CreateForBackup(Handle, alpm.alpm_pkg_get_backup);
        public string Base64Signature => alpm.alpm_pkg_get_base64_sig(Handle);
        public ValidationType Validation => alpm.alpm_pkg_get_validation(Handle);
        public bool HasScriptlet => alpm.alpm_pkg_has_scriptlet(Handle);
        public long DownloadSize => alpm.alpm_pkg_download_size(Handle);

        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);
        }
    }
}