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using System.Collections.Generic;
using XenAdmin.Core;
using XenAdmin.Mappings;
using XenAPI;

namespace XenAdmin.Actions.VMActions
{
    public class VMCrossPoolMigrateAction : PureAsyncAction
    {
        private readonly VmMapping mapping;
        private readonly XenAPI.Network transferNetwork;
        private readonly bool copy;

        /// <summary>
        /// Cross pool migration action. Can also be used to copy a VM across pools, by setting the "copy" parameter to true
        /// </summary>
        /// <param name="vm">the VM to be migrated</param>
        /// <param name="destinationHost">the destination host</param>
        /// <param name="transferNetwork">the network used for the VM migration</param>
        /// <param name="mapping">the storage and networking mappings</param>
        /// <param name="copy">weather this should be a cross-pool copy (true) or migrate (false) operation</param>
        public VMCrossPoolMigrateAction(VM vm, Host destinationHost, XenAPI.Network transferNetwork, VmMapping mapping, bool copy)
            : base(vm.Connection, GetTitle(vm, destinationHost, copy))
        {
            Session = vm.Connection.Session;
            Description = Messages.ACTION_PREPARING;
            VM = vm;
            Host = destinationHost;
            Pool = Helpers.GetPool(vm.Connection);
            this.mapping = mapping;
            this.transferNetwork = transferNetwork;
            this.copy = copy;
        }

        public static RbacMethodList StaticRBACDependencies
        {
            get
            {
                RbacMethodList list = new RbacMethodList( "Host.migrate_receive",
                                                          "VM.migrate_send", 
                                                          "VM.async_migrate_send",
                                                          "VM.assert_can_migrate");
                list.AddRange(Role.CommonTaskApiList);
                return list;
            }
        }
            

        public static string GetTitle(VM vm, Host toHost, bool copy)
        {
            if (copy)
                return string.Format(Messages.ACTION_VM_CROSS_POOL_COPY_TITLE, vm.Name, toHost.Name);

            Host residentOn = vm.Connection.Resolve(vm.resident_on);
            
            return residentOn == null
                ? string.Format(Messages.ACTION_VM_MIGRATING_NON_RESIDENT, vm.Name, toHost.Name)
                : string.Format(Messages.ACTION_VM_MIGRATING_RESIDENT, vm.Name, Helpers.GetName(residentOn), toHost.Name);
        }

        protected override void Run()
        {
            Description = copy ? Messages.ACTION_VM_COPYING: Messages.ACTION_VM_MIGRATING;
            try
            {
                PercentComplete = 0;
                Session session = Host.Connection.DuplicateSession();
                Dictionary<string, string> sendData = Host.migrate_receive(session, Host.opaque_ref, 
                                                                           transferNetwork.opaque_ref, new Dictionary<string, string>());
                PercentComplete = 5;
                LiveMigrateOptionsVmMapping options = new LiveMigrateOptionsVmMapping(mapping, VM);
                var _options = new Dictionary<string, string>(options.Options);
                if (copy)
                    _options.Add("copy", "true");
                RelatedTask = VM.async_migrate_send(Session, VM.opaque_ref, sendData, 
                                                    options.Live, options.VdiMap,
                                                    options.VifMap, _options);

                PollToCompletion(PercentComplete, 100);
            }
            catch (CancelledException)
            {
                Description = string.Format(copy ? Messages.ACTION_VM_CROSS_POOL_COPY_CANCELLED : Messages.ACTION_VM_MIGRATE_CANCELLED, 
                                            VM.Name);
                throw;
            }
            catch (Failure ex)
            {
                Description = ex.Message;
                List<string> errors = ex.ErrorDescription;
                throw;
            }
            Description = copy ? Messages.ACTION_VM_COPIED: Messages.ACTION_VM_MIGRATED;
        }
    }
}