// Copyright 2022 The KubeSphere Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package utils

import (
	"sort"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// IsDeletionCandidate checks if object is candidate to be deleted
func IsDeletionCandidate(obj metav1.Object, finalizer string) bool {
	return obj.GetDeletionTimestamp() != nil && ContainsString(obj.GetFinalizers(),
		finalizer, nil)
}

// NeedToAddFinalizer checks if need to add finalizer to object
func NeedToAddFinalizer(obj metav1.Object, finalizer string) bool {
	return obj.GetDeletionTimestamp() == nil && !ContainsString(obj.GetFinalizers(),
		finalizer, nil)
}

// CopyStrings copies the contents of the specified string slice
// into a new slice.
func CopyStrings(s []string) []string {
	if s == nil {
		return nil
	}
	c := make([]string, len(s))
	copy(c, s)
	return c
}

// SortStrings sorts the specified string slice in place. It returns the same
// slice that was provided in order to facilitate method chaining.
func SortStrings(s []string) []string {
	sort.Strings(s)
	return s
}

// ContainsString checks if a given slice of strings contains the provided string.
// If a modifier func is provided, it is called with the slice item before the comparation.
func ContainsString(slice []string, s string, modifier func(s string) string) bool {
	for _, item := range slice {
		if item == s {
			return true
		}
		if modifier != nil && modifier(item) == s {
			return true
		}
	}
	return false
}

// RemoveString returns a newly created []string that contains all items from slice that
// are not equal to s and modifier(s) in case modifier func is provided.
func RemoveString(slice []string, s string, modifier func(s string) string) []string {
	newSlice := make([]string, 0)
	for _, item := range slice {
		if item == s {
			continue
		}
		if modifier != nil && modifier(item) == s {
			continue
		}
		newSlice = append(newSlice, item)
	}
	if len(newSlice) == 0 {
		// Sanitize for unit tests so we don't need to distinguish empty array
		// and nil.
		newSlice = nil
	}
	return newSlice
}