package client

import (
	"context"
	"fmt"

	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v2"
)

// GetScalingGroupImage returns the image URI of the scaling group.
func (c *Client) GetScalingGroupImage(ctx context.Context, scalingGroupID string) (string, error) {
	_, resourceGroup, scaleSet, err := splitVMSSID(scalingGroupID)
	if err != nil {
		return "", err
	}
	res, err := c.scaleSetsAPI.Get(ctx, resourceGroup, scaleSet, nil)
	if err != nil {
		return "", err
	}
	if res.Properties == nil ||
		res.Properties.VirtualMachineProfile == nil ||
		res.Properties.VirtualMachineProfile.StorageProfile == nil ||
		res.Properties.VirtualMachineProfile.StorageProfile.ImageReference == nil ||
		res.Properties.VirtualMachineProfile.StorageProfile.ImageReference.ID == nil {
		return "", fmt.Errorf("scalet set %q does not have valid image reference", scalingGroupID)
	}
	return *res.Properties.VirtualMachineProfile.StorageProfile.ImageReference.ID, nil
}

// SetScalingGroupImage sets the image URI of the scaling group.
func (c *Client) SetScalingGroupImage(ctx context.Context, scalingGroupID, imageURI string) error {
	_, resourceGroup, scaleSet, err := splitVMSSID(scalingGroupID)
	if err != nil {
		return err
	}
	poller, err := c.scaleSetsAPI.BeginUpdate(ctx, resourceGroup, scaleSet, armcompute.VirtualMachineScaleSetUpdate{
		Properties: &armcompute.VirtualMachineScaleSetUpdateProperties{
			VirtualMachineProfile: &armcompute.VirtualMachineScaleSetUpdateVMProfile{
				StorageProfile: &armcompute.VirtualMachineScaleSetUpdateStorageProfile{
					ImageReference: &armcompute.ImageReference{
						ID: &imageURI,
					},
				},
			},
		},
	}, nil)
	if err != nil {
		return err
	}
	if _, err := poller.PollUntilDone(ctx, nil); err != nil {
		return err
	}
	return nil
}