/*
Copyright 2019 the Velero contributors.

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 kube

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	corev1api "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
)

func TestParseResourceRequirements(t *testing.T) {
	type args struct {
		cpuRequest              string
		memRequest              string
		ephemeralStorageRequest string
		cpuLimit                string
		memLimit                string
		ephemeralStorageLimit   string
	}
	tests := []struct {
		name     string
		args     args
		wantErr  bool
		expected *corev1api.ResourceRequirements
	}{
		{"unbounded quantities", args{"0", "0", "0", "0", "0", "0"}, false, &corev1api.ResourceRequirements{
			Requests: corev1api.ResourceList{},
			Limits:   corev1api.ResourceList{},
		}},
		{"valid quantities", args{"100m", "128Mi", "5Gi", "200m", "256Mi", "10Gi"}, false, nil},
		{"CPU request with unbounded limit", args{"100m", "128Mi", "5Gi", "0", "256Mi", "10Gi"}, false, &corev1api.ResourceRequirements{
			Requests: corev1api.ResourceList{
				corev1api.ResourceCPU:              resource.MustParse("100m"),
				corev1api.ResourceMemory:           resource.MustParse("128Mi"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("5Gi"),
			},
			Limits: corev1api.ResourceList{
				corev1api.ResourceMemory:           resource.MustParse("256Mi"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("10Gi"),
			},
		}},
		{"Mem request with unbounded limit", args{"100m", "128Mi", "5Gi", "200m", "0", "10Gi"}, false, &corev1api.ResourceRequirements{
			Requests: corev1api.ResourceList{
				corev1api.ResourceCPU:              resource.MustParse("100m"),
				corev1api.ResourceMemory:           resource.MustParse("128Mi"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("5Gi"),
			},
			Limits: corev1api.ResourceList{
				corev1api.ResourceCPU:              resource.MustParse("200m"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("10Gi"),
			},
		}},
		{"Ephemeral storage request with unbounded limit", args{"100m", "128Mi", "5Gi", "200m", "256Mi", "0"}, false, &corev1api.ResourceRequirements{
			Requests: corev1api.ResourceList{
				corev1api.ResourceCPU:              resource.MustParse("100m"),
				corev1api.ResourceMemory:           resource.MustParse("128Mi"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("5Gi"),
			},
			Limits: corev1api.ResourceList{
				corev1api.ResourceCPU:    resource.MustParse("200m"),
				corev1api.ResourceMemory: resource.MustParse("256Mi"),
			},
		}},

		{"CPU/Mem/EphemeralStorage requests with unbounded limits", args{"100m", "128Mi", "5Gi", "0", "0", "0"}, false, &corev1api.ResourceRequirements{
			Requests: corev1api.ResourceList{
				corev1api.ResourceCPU:              resource.MustParse("100m"),
				corev1api.ResourceMemory:           resource.MustParse("128Mi"),
				corev1api.ResourceEphemeralStorage: resource.MustParse("5Gi"),
			},
			Limits: corev1api.ResourceList{},
		}},
		{"invalid quantity", args{"100m", "invalid", "1Gi", "200m", "256Mi", "valid"}, true, nil},
		{"CPU request greater than limit", args{"300m", "128Mi", "5Gi", "200m", "256Mi", "10Gi"}, true, nil},
		{"memory request greater than limit", args{"100m", "512Mi", "5Gi", "200m", "256Mi", "10Gi"}, true, nil},
		{"ephemeral storage request greater than limit", args{"100m", "128Mi", "10Gi", "200m", "256Mi", "5Gi"}, true, nil},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := ParseResourceRequirements(tt.args.cpuRequest, tt.args.memRequest, tt.args.ephemeralStorageRequest, tt.args.cpuLimit, tt.args.memLimit, tt.args.ephemeralStorageLimit)
			if tt.wantErr {
				assert.Error(t, err)
				return
			}
			require.NoError(t, err)

			var expected corev1api.ResourceRequirements
			if tt.expected == nil {
				expected = corev1api.ResourceRequirements{
					Requests: corev1api.ResourceList{
						corev1api.ResourceCPU:              resource.MustParse(tt.args.cpuRequest),
						corev1api.ResourceMemory:           resource.MustParse(tt.args.memRequest),
						corev1api.ResourceEphemeralStorage: resource.MustParse(tt.args.ephemeralStorageRequest),
					},
					Limits: corev1api.ResourceList{
						corev1api.ResourceCPU:              resource.MustParse(tt.args.cpuLimit),
						corev1api.ResourceMemory:           resource.MustParse(tt.args.memLimit),
						corev1api.ResourceEphemeralStorage: resource.MustParse(tt.args.ephemeralStorageLimit),
					},
				}
			} else {
				expected = *tt.expected
			}

			assert.Equal(t, expected, got)
		})
	}
}
