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using System;
using System.Collections.Generic;
using System.Linq;
using XenAdmin.Network;
using XenAPI;

namespace XenAdmin.Mappings
{
    public class LiveMigrateOptionsVmMapping
    {
        private readonly VmMapping vmMapping;
        private readonly VM vm;

        public LiveMigrateOptionsVmMapping(VmMapping vmMapping, IXenObject vm)
        {
            this.vmMapping = vmMapping;
            this.vm = vm as VM;

            if(vm==null)
                throw new NullReferenceException("VM passed to ctor was null");
        }

        /// <summary>
        /// VDI ref to SR ref Map
        /// </summary>
        public Dictionary<XenRef<VDI>, XenRef<SR>> VdiMap
        { 
            get
            {
                return vmMapping.Storage.ToDictionary(pair => new XenRef<VDI>(pair.Key), 
                                                      pair => new XenRef<SR>(pair.Value));
            }
        }

        /// <summary>
        /// VIF to remote network
        /// </summary>
        public Dictionary<XenRef<VIF>, XenRef<XenAPI.Network>> VifMap 
        { 
            get
            {
                //VM mapping is network to network
                Dictionary<XenRef<VIF>, XenRef<XenAPI.Network>> map = new Dictionary<XenRef<VIF>, XenRef<XenAPI.Network>>();

                foreach (var pair in vmMapping.Networks)
                {
                    XenAPI.Network net = vm.Connection.Resolve(new XenRef<XenAPI.Network>(pair.Key));

                    List<XenRef<VIF>> selectedVIFs =  (from vifRef in net.VIFs
                                                       where vm.VIFs.Contains(vifRef)
                                                       select vifRef).ToList();

                    KeyValuePair<string, XenAPI.Network> closurePair = pair;
                    selectedVIFs.ForEach(v => map.Add(new XenRef<VIF>(v.opaque_ref),
                                         new XenRef<XenAPI.Network>(closurePair.Value.opaque_ref)));

                }

                return map;
            }
        }

        public bool Live
        {
            get { return true; }
        }

        public Dictionary<string, string> Options 
        {
            get { return new Dictionary<string, string>(); }
        }
    }
}