func pickIngress()

in cli/azd/pkg/apphost/aca_ingress.go [226:302]
70 lines of code
22 McCabe index (conditional complexity)

func pickIngress(endpointByTargetPortProperties map[string]*acaPort, httpIngress string, defaultPort int) (
	*genContainerAppIngress, []string, error) {
	finalIngress := &genContainerAppIngress{}
	var bindingNamesFromIngress []string
	ingress := httpIngress
	if ingress != "" {
		props := endpointByTargetPortProperties[ingress]
		for _, binding := range props.bindings {
			if props.httpOnly && binding.Port != nil && binding.Scheme == acaIngressSchemaHttp && *binding.Port != 80 {
				// Main ingress http with non default port rule
				return nil, nil,
					fmt.Errorf(
						"Binding %s can't be mapped to main ingress because it has port %d defined. "+
							"main ingress only supports port 80 for http scheme.",
						binding.name, *binding.Port)
			}
			if props.httpOnly && binding.Port != nil && binding.Scheme == acaIngressSchemaHttps && *binding.Port != 443 {
				// Main ingress https with non default port rule
				return nil, nil,
					fmt.Errorf(
						"Binding %s can't be mapped to main ingress because it has port %d defined. "+
							"main ingress only supports port 443 for https scheme.",
						binding.name, *binding.Port)
			}
			bindingNamesFromIngress = append(bindingNamesFromIngress, binding.name)
		}

		finalIngress.External = props.external
		finalIngress.TargetPort = props.port
		if finalIngress.TargetPort == 0 {
			finalIngress.TargetPort = defaultPort
			finalIngress.UsingDefaultPort = true
		}
		finalIngress.Transport = acaIngressSchemaHttp
		if props.hasHttp2 {
			finalIngress.Transport = acaIngressTransportHttp2
		}
		if props.hasHttp2 || !props.external {
			finalIngress.AllowInsecure = true
		}

	} else {
		// ingress still empty b/c no http ingress. pick the first group with lowest index
		minIndex := 0
		for groupKey, group := range endpointByTargetPortProperties {
			for _, binding := range group.bindings {
				if ingress == "" || binding.order < minIndex {
					minIndex = binding.order
					ingress = groupKey
				}
			}
		}
		selectedIngress := endpointByTargetPortProperties[ingress]
		for _, binding := range selectedIngress.bindings {
			bindingNamesFromIngress = append(bindingNamesFromIngress, binding.name)
		}
		port := selectedIngress.port
		finalIngress.Transport = acaIngressSchemaTcp
		finalIngress.TargetPort = port
		finalIngress.ExposedPort = selectedIngress.exposedPort
	}

	for groupKey, props := range endpointByTargetPortProperties {
		if groupKey == ingress {
			continue
		}
		finalIngress.AdditionalPortMappings = append(finalIngress.AdditionalPortMappings,
			genContainerAppIngressAdditionalPortMappings{
				genContainerAppIngressPort: genContainerAppIngressPort{
					TargetPort:  props.port,
					ExposedPort: props.exposedPort,
				},
			})
	}

	return finalIngress, bindingNamesFromIngress, nil
}