package exporters

import (
	"encoding/json"
	"regexp"

	v1 "k8s.io/api/core/v1"
	"sigs.k8s.io/yaml"
)

// Service removes basic stuff like namespace, status, managedBy and lastAppliedConfiguration
func Service(svc *v1.Service, jqcommands []string, nobuiltinmods bool, chartname string, lessOpinions bool) string {
	if !nobuiltinmods {
		// All the below do not belong in a helm chart yaml
		delete(svc.ObjectMeta.Annotations, "kubectl.kubernetes.io/last-applied-configuration")
		delete(svc.ObjectMeta.Annotations, "deployment.kubernetes.io/revision")
		svc.ObjectMeta.ManagedFields = nil
		svc.ObjectMeta.Namespace = ""
		svc.ObjectMeta.ResourceVersion = ""
		svc.ObjectMeta.Generation = 0
		svc.ObjectMeta.SelfLink = ""
		svc.ObjectMeta.UID = ""
		jqcommands = append(jqcommands, "del(.metadata.creationTimestamp)")
		jqcommands = append(jqcommands, "del(.status)")

		// Here's where we get more opinionated though
		if !lessOpinions {
			jqcommands = append(jqcommands, ".metadata.name = \"{{ $fullName }}\"")
			jqcommands = append(jqcommands, ".metadata.labels += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".labels\\\" . | nindent 4 }}\"}")
			jqcommands = append(jqcommands, ".metadata.annotations += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".annotations\\\" . | nindent 4 }}\"}")
			jqcommands = append(jqcommands, "del(.spec.clusterIP)")
			jqcommands = append(jqcommands, ".spec.externalTrafficPolicy = \"{{ .Values.service.externalTrafficPolicy }}\"")
			jqcommands = append(jqcommands, ".spec.type = \"{{ .Values.service.type }}\"")
			jqcommands = append(jqcommands, "del(.spec.ports[].nodePort)")
		}
	}
	// Jump to json for jq ;-)
	jsonForm, err := json.Marshal(svc)
	if err != nil {
		panic(err.Error())
	}
	var intermediateJSONForm []byte
	var finalJSONForm []byte

	if len(jqcommands) > 0 {
		for _, command := range jqcommands {
			intermediateJSONForm = jQOnJSONByteArray(command, jsonForm)
			jsonForm = intermediateJSONForm
		}
		finalJSONForm = jsonForm
	} else {
		finalJSONForm = jsonForm
	}

	y, err := yaml.JSONToYAML(finalJSONForm)
	if err != nil {
		panic(err.Error())
	}
	ret := "{{- if .Values.service.enabled -}}\n"
	ret += "{{- $fullName := include \"" + chartname + ".fullname\" . -}}\n"
	ret += "kind: Service\n"
	ret += "apiVersion: v1\n"
	out := string(y)
	var re = regexp.MustCompile(`HELMTEMPLATEDELETEKEY: '([^']*)'`)
	out = re.ReplaceAllString(out, "$1")
	re = regexp.MustCompile(`(?s)- HELMTEMPLATEDELETEKEYANDARRAYMARKER: '([^']*)'`)
	out = re.ReplaceAllString(out, "$1")

	ret += string(out)
	ret += "{{- end -}}" // if .Values.service.enabled
	return ret
}