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using XenAPI;
using XenAdmin.Core;


namespace XenAdmin.Actions.VMActions
{
    public abstract class VMShutdownAction : PureAsyncAction
    {
        protected VMShutdownAction(VM vm,string title)
            : base(vm.Connection, title)
        {
            this.Description = Messages.ACTION_PREPARING;
            this.VM = vm;
            this.Host = vm.Home();
            this.Pool = Core.Helpers.GetPool(vm.Connection);
        }

        /// <summary>
        /// Enables or disables HA protection for a VM (VM.ha_always_run). Also does a pool.sync_database afterwards.
        /// May throw a XenAPI.Failure.
        /// </summary>
        /// <param name="protect"></param>
        /// <param name="act"></param>
        /// <param name="session"></param>
        /// <param name="vm"></param>
        /// <param name="start"></param>
        /// <param name="end"></param>
        protected static void SetHaProtection(bool protect, AsyncAction action, VM vm, int start, int end)
        {
        	// Do database sync. Helps to ensure that the change persists over master failover.
            action.RelatedTask = XenAPI.Pool.async_sync_database(action.Session);
            action.PollToCompletion(start, end);
        }


    }

    public class VMCleanShutdown : VMShutdownAction
    {
        public VMCleanShutdown(VM vm)
            : base(vm, string.Format(Messages.ACTION_VM_SHUTTING_DOWN_TITLE, vm.Name, vm.Home() == null ? Helpers.GetName(vm.Connection) : vm.Home().Name))
        {
        }

        protected override void Run()
        {
            bool vmHasSavedRestartPriority = VM.HasSavedRestartPriority;
            this.Description = Messages.ACTION_VM_SHUTTING_DOWN;

            if (vmHasSavedRestartPriority)
            {
                // Disable HA protection
                SetHaProtection(false, this, VM, 0, 50);
            }

            RelatedTask = XenAPI.VM.async_clean_shutdown(Session, VM.opaque_ref);
            PollToCompletion(vmHasSavedRestartPriority ? 50 : 0, 100);
            this.Description = Messages.ACTION_VM_SHUT_DOWN;
        }
    }

    public class VMHardShutdown : VMShutdownAction
    {
        public VMHardShutdown(VM vm)
            : base(vm, string.Format(Messages.ACTION_VM_SHUTTING_DOWN_TITLE, vm.Name, vm.Home() == null ? Helpers.GetName(vm.Connection) : vm.Home().Name))
        {
        }

        protected override void Run()
        {
            bool vmHasSavedRestartPriority =VM.HasSavedRestartPriority;
            this.Description = Messages.ACTION_VM_SHUTTING_DOWN;

            if (vmHasSavedRestartPriority)
            {
                // Disable HA protection
                SetHaProtection(false, this, VM, 0, 70);
            }
            RelatedTask = XenAPI.VM.async_hard_shutdown(Session, VM.opaque_ref);
            PollToCompletion(vmHasSavedRestartPriority ? 70 : 0, 100);

            this.Description = Messages.ACTION_VM_SHUT_DOWN;
        }
    }
}