package privatelinkgroup

import (
	"context"
	"testing"

	awssdk "github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2"
	elbv2types "github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2/types"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestDescribeNLBIncludesAttachedSubnetIDs(t *testing.T) {
	cli := &fakeLoadBalancerClient{
		addressType: elbv2types.IpAddressTypeIpv4,
		state:       elbv2types.LoadBalancerStateEnumActive,
		vpcID:       "vpc-1",
		subnetIDs:   []string{"subnet-b", "subnet-a"},
	}
	observed, err := DescribeNLB(context.Background(), cli, "arn-1")
	require.NoError(t, err)
	assert.Equal(t, "vpc-1", observed.VPCID)
	assert.Equal(t, elbv2types.LoadBalancerStateEnumActive, observed.State)
	assert.Equal(t, []string{"subnet-a", "subnet-b"}, observed.SubnetIDs)
}

type fakeLoadBalancerClient struct {
	addressType elbv2types.IpAddressType
	state       elbv2types.LoadBalancerStateEnum
	vpcID       string
	subnetIDs   []string
}

func (f *fakeLoadBalancerClient) DescribeLoadBalancers(
	_ context.Context,
	input *elasticloadbalancingv2.DescribeLoadBalancersInput,
	_ ...func(*elasticloadbalancingv2.Options),
) (*elasticloadbalancingv2.DescribeLoadBalancersOutput, error) {
	out := &elasticloadbalancingv2.DescribeLoadBalancersOutput{}
	for _, arn := range input.LoadBalancerArns {
		lb := elbv2types.LoadBalancer{
			LoadBalancerArn: awssdk.String(arn),
			VpcId:           awssdk.String(f.vpcID),
			IpAddressType:   f.addressType,
			State:           &elbv2types.LoadBalancerState{Code: f.state},
		}
		for _, subnetID := range f.subnetIDs {
			lb.AvailabilityZones = append(lb.AvailabilityZones, elbv2types.AvailabilityZone{SubnetId: awssdk.String(subnetID)})
		}
		out.LoadBalancers = append(out.LoadBalancers, lb)
	}
	return out, nil
}