namespace DSInternals.PowerShell.Commands
{
    using DSInternals.Common;
    using DSInternals.Common.Interop;
    using DSInternals.DataStore;
    using System;
    using System.ComponentModel;
    using System.Management.Automation;

    [Cmdlet(VerbsCommon.Get, "BootKey")]
    [OutputType(typeof(string))]
    public class GetBootKeyCommand : PSCmdletEx
    {
        private const string OnlineParameterSet = "Online";
        private const string OfflineParameterSet = "Offline";

        [Parameter(Mandatory = true, Position = 0, HelpMessage = "TODO", ParameterSetName = OfflineParameterSet)]
        [ValidateNotNullOrEmpty]
        [Alias("Path", "FilePath", "SystemHivePath", "HivePath")]
        public string SystemHiveFilePath
        {
            get;
            set;
        }
        [Parameter(Mandatory = true, ParameterSetName = OnlineParameterSet)]
        public SwitchParameter Online
        {
            get;
            set;
        }

        protected override void BeginProcessing()
        {
            try
            {
                byte[] bootKey;
                if(Online.IsPresent)
                {
                    // Online
                    bootKey = BootKeyRetriever.GetBootKey();
                }
                else
                {
                    // Offline
                    string hivePathResolved = this.ResolveSinglePath(this.SystemHiveFilePath);
                    bootKey = BootKeyRetriever.GetBootKey(hivePathResolved);
                }
                this.WriteObject(bootKey.ToHex());
            }
            catch(SessionStateException ex)
            {
                // This may be DriveNotFoundException, ItemNotFoundException, ProviderNotFoundException, etc.
                // Terminate on this error:
                this.ThrowTerminatingError(new ErrorRecord(ex.ErrorRecord, ex));
            }
            catch(Win32Exception ex)
            {
                ErrorCategory category = ((Win32ErrorCode)ex.NativeErrorCode).ToPSCategory();
                ErrorRecord error = new ErrorRecord(ex, "GetBootKey_Win32Error", category, this.SystemHiveFilePath);
                this.ThrowTerminatingError(error);

            }
            catch (Exception ex)
            {
                ErrorRecord error = new ErrorRecord(ex, "GetBootKey_OtherError", ErrorCategory.OpenError, null);
                // Terminate on this error:
                this.ThrowTerminatingError(error);
            }
        }
    }
}