namespace DSInternals.PowerShell.Commands
{
    using System;
    using System.Management.Automation;
    using DSInternals.SAM;
    using DSInternals.SAM.Interop;

    public abstract class LsaPolicyCommandBase : PSCmdlet, IDisposable
    {
        protected LsaPolicy LsaPolicy
        {
            get;
            private set;
        }

        #region Parameters
        [Parameter(Mandatory = false, Position = 1)]
        [Alias("Server", "ServerName", "Computer", "Machine", "MachineName", "System", "SystemName")]
        [ValidateNotNullOrEmpty]
        public string ComputerName
        {
            get;
            set;
        }
        #endregion Parameters

        #region Cmdlet Overrides

        protected override void BeginProcessing()
        {
            // TODO: Extract as resource:
            string serverName = this.ComputerName ?? "localhost";
            this.WriteDebug(string.Format("Connecting to LSA service running on {0}.", serverName));
            // TODO: Exception handling (process error category)
            this.LsaPolicy = new LsaPolicy(this.ComputerName, this.RequiredAccessMask);
        }
        #endregion Cmdlet Overrides
        
        protected abstract LsaPolicyAccessMask RequiredAccessMask
        {
            get;
        }

        public void Dispose()
        {
            this.Dispose(true);
            System.GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing && this.LsaPolicy != null)
            {
                this.LsaPolicy.Dispose();
                this.LsaPolicy = null;
            }
        }
    }
}