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

namespace XenAdmin.Actions
{
    public class GpuAssignAction : AsyncAction
    {
        private readonly VM vm;
        private readonly List<VGPU> vGpus;

        public GpuAssignAction(VM vm, List<VGPU> vGpus)
            : base(vm.Connection, "Set GPU", true)
        {
            this.vm = vm;
            this.vGpus = vGpus;
            ApiMethodsToRoleCheck.AddRange("VGPU.destroy", "VGPU.async_create");
        }

        protected override void Run()
        {
            var vgpuSetToRemove = new HashSet<VGPU>(vm.Connection.ResolveAll(vm.VGPUs));
            // Existing vGPUs must have opaque_ref
            var vgpuSetToUnchanged = new HashSet<VGPU>(vGpus.FindAll(x => x.opaque_ref != null));

            vgpuSetToRemove.ExceptWith(vgpuSetToUnchanged);

            foreach (VGPU vgpu in vgpuSetToRemove)
                VGPU.destroy(Session, vgpu.opaque_ref);

            // New added vGPUs haven't opaque_ref
            foreach (var vGpu in vGpus.FindAll(x => x.opaque_ref == null))
                AddGpu(vm.Connection.Resolve(vGpu.GPU_group), vm.Connection.Resolve(vGpu.type), vGpu.device ?? "0");
        }

        private void AddGpu(GPU_group gpuGroup, VGPU_type vGpuType, string device = "0")
        {
            if (gpuGroup == null)
                return;

            Dictionary<string, string> other_config = new Dictionary<string, string>();

            if (Helpers.FeatureForbidden(vm, Host.RestrictVgpu) || vGpuType == null)
                VGPU.async_create(Session, vm.opaque_ref, gpuGroup.opaque_ref, device, other_config);
            else
                VGPU.async_create(Session, vm.opaque_ref, gpuGroup.opaque_ref, device,
                    other_config, vGpuType.opaque_ref);
        }
    }
}