package interpreter

import (
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"

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

const (
	// Wildcard indicates that any value can be matched.
	Wildcard = "*"
)

// Matcher determines if the Object matches the Rule.
type Matcher struct {
	Operation configv1alpha1.InterpreterOperation
	Rule      configv1alpha1.RuleWithOperations
	Object    *unstructured.Unstructured
}

// Matches tells if the Operation, Object matches the Rule.
func (m *Matcher) Matches() bool {
	return m.operation() && m.group() && m.version() && m.kind()
}

func (m *Matcher) operation() bool {
	for _, op := range m.Rule.Operations {
		if op == configv1alpha1.InterpreterOperationAll || op == m.Operation {
			return true
		}
	}
	return false
}

func (m *Matcher) group() bool {
	return exactOrWildcard(m.Object.GroupVersionKind().Group, m.Rule.APIGroups)
}

func (m *Matcher) version() bool {
	return exactOrWildcard(m.Object.GroupVersionKind().Version, m.Rule.APIVersions)
}

func (m *Matcher) kind() bool {
	return exactOrWildcard(m.Object.GetKind(), m.Rule.Kinds)
}

func exactOrWildcard(requested string, items []string) bool {
	for _, item := range items {
		if item == Wildcard || item == requested {
			return true
		}
	}
	return false
}