package configmanager

import (
	configv1alpha1 "github.com/karmada-io/karmada/pkg/apis/config/v1alpha1"
)

// CustomConfiguration provides base information about custom interpreter configuration
type CustomConfiguration interface {
	Merge(rules configv1alpha1.CustomizationRules)
}

// LuaScriptAccessor provides a common interface to get custom interpreter lua script
type LuaScriptAccessor interface {
	CustomConfiguration

	GetRetentionLuaScript() string
	GetReplicaResourceLuaScript() string
	GetReplicaRevisionLuaScript() string
	GetStatusReflectionLuaScript() string
	GetStatusAggregationLuaScript() string
	GetHealthInterpretationLuaScript() string
	GetDependencyInterpretationLuaScripts() []string
}

// CustomAccessor provides a common interface to get custom interpreter configuration.
type CustomAccessor interface {
	LuaScriptAccessor
}

type resourceCustomAccessor struct {
	retention                 *configv1alpha1.LocalValueRetention
	replicaResource           *configv1alpha1.ReplicaResourceRequirement
	replicaRevision           *configv1alpha1.ReplicaRevision
	statusReflection          *configv1alpha1.StatusReflection
	statusAggregation         *configv1alpha1.StatusAggregation
	healthInterpretation      *configv1alpha1.HealthInterpretation
	dependencyInterpretations []*configv1alpha1.DependencyInterpretation
}

// NewResourceCustomAccessor creates an accessor for resource interpreter customization.
func NewResourceCustomAccessor() CustomAccessor {
	return &resourceCustomAccessor{}
}

// Merge merges the given CustomizationRules with the current rules, ignore if duplicates occur.
func (a *resourceCustomAccessor) Merge(rules configv1alpha1.CustomizationRules) {
	if rules.Retention != nil {
		a.setRetain(rules.Retention)
	}
	if rules.ReplicaResource != nil {
		a.setReplicaResource(rules.ReplicaResource)
	}
	if rules.ReplicaRevision != nil {
		a.setReplicaRevision(rules.ReplicaRevision)
	}
	if rules.StatusReflection != nil {
		a.setStatusReflection(rules.StatusReflection)
	}
	if rules.StatusAggregation != nil {
		a.setStatusAggregation(rules.StatusAggregation)
	}
	if rules.HealthInterpretation != nil {
		a.setHealthInterpretation(rules.HealthInterpretation)
	}
	if rules.DependencyInterpretation != nil {
		a.appendDependencyInterpretation(rules.DependencyInterpretation)
	}
}

func (a *resourceCustomAccessor) GetRetentionLuaScript() string {
	if a.retention == nil {
		return ""
	}
	return a.retention.LuaScript
}

func (a *resourceCustomAccessor) GetReplicaResourceLuaScript() string {
	if a.replicaResource == nil {
		return ""
	}
	return a.replicaResource.LuaScript
}

func (a *resourceCustomAccessor) GetReplicaRevisionLuaScript() string {
	if a.replicaRevision == nil {
		return ""
	}
	return a.replicaRevision.LuaScript
}

func (a *resourceCustomAccessor) GetStatusReflectionLuaScript() string {
	if a.statusReflection == nil {
		return ""
	}
	return a.statusReflection.LuaScript
}

func (a *resourceCustomAccessor) GetStatusAggregationLuaScript() string {
	if a.statusAggregation == nil {
		return ""
	}
	return a.statusAggregation.LuaScript
}

func (a *resourceCustomAccessor) GetHealthInterpretationLuaScript() string {
	if a.healthInterpretation == nil {
		return ""
	}
	return a.healthInterpretation.LuaScript
}

func (a *resourceCustomAccessor) GetDependencyInterpretationLuaScripts() []string {
	if a.dependencyInterpretations == nil {
		return nil
	}

	var scripts []string
	for _, interpretation := range a.dependencyInterpretations {
		if interpretation.LuaScript != "" {
			scripts = append(scripts, interpretation.LuaScript)
		}
	}
	return scripts
}

func (a *resourceCustomAccessor) setRetain(retention *configv1alpha1.LocalValueRetention) {
	if a.retention == nil {
		a.retention = retention
		return
	}

	if retention.LuaScript != "" && a.retention.LuaScript == "" {
		a.retention.LuaScript = retention.LuaScript
	}
}

func (a *resourceCustomAccessor) setReplicaResource(replicaResource *configv1alpha1.ReplicaResourceRequirement) {
	if a.replicaResource == nil {
		a.replicaResource = replicaResource
		return
	}

	if replicaResource.LuaScript != "" && a.replicaResource.LuaScript == "" {
		a.replicaResource.LuaScript = replicaResource.LuaScript
	}
}

func (a *resourceCustomAccessor) setReplicaRevision(replicaRevision *configv1alpha1.ReplicaRevision) {
	if a.replicaRevision == nil {
		a.replicaRevision = replicaRevision
		return
	}

	if replicaRevision.LuaScript != "" && a.replicaRevision.LuaScript == "" {
		a.replicaRevision.LuaScript = replicaRevision.LuaScript
	}
}

func (a *resourceCustomAccessor) setStatusReflection(statusReflection *configv1alpha1.StatusReflection) {
	if a.statusReflection == nil {
		a.statusReflection = statusReflection
		return
	}

	if statusReflection.LuaScript != "" && a.statusReflection.LuaScript == "" {
		a.statusReflection.LuaScript = statusReflection.LuaScript
	}
}

func (a *resourceCustomAccessor) setStatusAggregation(statusAggregation *configv1alpha1.StatusAggregation) {
	if a.statusAggregation == nil {
		a.statusAggregation = statusAggregation
		return
	}

	if statusAggregation.LuaScript != "" && a.statusAggregation.LuaScript == "" {
		a.statusAggregation.LuaScript = statusAggregation.LuaScript
	}
}

func (a *resourceCustomAccessor) setHealthInterpretation(healthInterpretation *configv1alpha1.HealthInterpretation) {
	if a.healthInterpretation == nil {
		a.healthInterpretation = healthInterpretation
		return
	}

	if healthInterpretation.LuaScript != "" && a.healthInterpretation.LuaScript == "" {
		a.healthInterpretation.LuaScript = healthInterpretation.LuaScript
	}
}

func (a *resourceCustomAccessor) appendDependencyInterpretation(dependencyInterpretation *configv1alpha1.DependencyInterpretation) {
	a.dependencyInterpretations = append(a.dependencyInterpretations, dependencyInterpretation)
}