/*
Copyright 2018 The Rook Authors. All rights reserved.

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 test

import (
	"fmt"
	"strings"
	"testing"

	e "github.com/pkg/errors"
	"github.com/rook/rook/pkg/operator/ceph/config"
	optest "github.com/rook/rook/pkg/operator/test"
	"github.com/stretchr/testify/assert"
)

const (
	labelMismatchFormat = "label mismatch: expected={%s: %s} present={%s: %s}"
)

func checkLabel(key, value string, labels map[string]string) error {
	v, ok := labels[key]
	if !ok {
		return e.Errorf("label not present: expected={%s: %s}", key, value)
	}
	if v != value {
		return e.Errorf("label mismatch: expected={%s: %s} present={%s: %s}", key, value, key, v)
	}
	return nil
}

func combineErrors(errors ...error) error {
	errText := ""
	failure := false
	for _, e := range errors {
		if e != nil {
			failure = true
			errText = fmt.Sprintf("%v: %s", e, errText) // Will result in string ending in ": "
		}
	}
	if failure {
		errText = strings.TrimRight(errText, ": ") // Remove ": " from end
		return e.Errorf("%s", errText)
	}
	return nil
}

// VerifyAppLabels returns a descriptive error if app labels are not present or not as expected.
func VerifyAppLabels(appName, namespace string, labels map[string]string) error {
	errA := checkLabel("app", appName, labels)
	errB := checkLabel("rook_cluster", namespace, labels)
	return combineErrors(errA, errB)
}

// VerifyPodLabels returns a descriptive error if pod labels are not present or not as expected.
func VerifyPodLabels(appName, namespace, daemonType, daemonID string, labels map[string]string) error {
	errA := VerifyAppLabels(appName, namespace, labels)
	errB := checkLabel("ceph_daemon_id", daemonID, labels)
	errC := checkLabel(daemonType, daemonID, labels)
	return combineErrors(errA, errB, errC)
}

// AssertLabelsContainCephRequirements asserts that the the labels under test contain the labels
// which all Ceph pods should have. This can be used with labels for Kubernetes Deployments,
// DaemonSets, etc.
func AssertLabelsContainCephRequirements(
	t *testing.T, labels map[string]string,
	daemonType config.DaemonType, daemonID, appName, namespace string,
) {
	optest.AssertLabelsContainRookRequirements(t, labels, appName)

	resourceLabels := []string{}
	for k, v := range labels {
		resourceLabels = append(resourceLabels, fmt.Sprintf("%s=%s", k, v))
	}
	expectedLabels := []string{
		"ceph_daemon_id=" + daemonID,
		string(daemonType) + "=" + daemonID,
		"rook_cluster" + "=" + namespace,
	}
	assert.Subset(t, resourceLabels, expectedLabels,
		"labels on resource do not match Ceph requirements", labels)
}
