package kube

import (
	"io"
	"strings"
	"testing"

	"k8s.io/kubernetes/pkg/api/meta"
	"k8s.io/kubernetes/pkg/client/unversioned/fake"
	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
	"k8s.io/kubernetes/pkg/kubectl/resource"
)

func TestPerform(t *testing.T) {
	tests := []struct {
		name       string
		namespace  string
		reader     io.Reader
		count      int
		err        bool
		errMessage string
	}{
		{
			name:      "Valid input",
			namespace: "test",
			reader:    strings.NewReader(guestbookManifest),
			count:     6,
		}, {
			name:       "Empty manifests",
			namespace:  "test",
			reader:     strings.NewReader(""),
			err:        true,
			errMessage: "no objects passed to create",
		},
	}

	for _, tt := range tests {
		results := []*resource.Info{}

		fn := func(info *resource.Info) error {
			results = append(results, info)

			if info.Namespace != tt.namespace {
				t.Errorf("%q. expected namespace to be '%s', got %s", tt.name, tt.namespace, info.Namespace)
			}
			return nil
		}

		f := cmdutil.NewFactory(nil)
		f.ClientForMapping = func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
			return &fake.RESTClient{}, nil
		}

		err := perform(f, tt.namespace, tt.reader, fn)
		if (err != nil) != tt.err {
			t.Errorf("%q. expected error: %v, got %v", tt.name, tt.err, err)
		}
		if err != nil && err.Error() != tt.errMessage {
			t.Errorf("%q. expected error message: %v, got %v", tt.name, tt.errMessage, err)
		}

		if len(results) != tt.count {
			t.Errorf("%q. expected %d result objects, got %d", tt.name, tt.count, len(results))
		}
	}
}

const guestbookManifest = `
apiVersion: v1
kind: Service
metadata:
  name: redis-master
  labels:
    app: redis
    tier: backend
    role: master
spec:
  ports:
  - port: 6379
    targetPort: 6379
  selector:
    app: redis
    tier: backend
    role: master
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis-master
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: redis
        role: master
        tier: backend
    spec:
      containers:
      - name: master
        image: gcr.io/google_containers/redis:e2e  # or just image: redis
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
  name: redis-slave
  labels:
    app: redis
    tier: backend
    role: slave
spec:
  ports:
    # the port that this service should serve on
  - port: 6379
  selector:
    app: redis
    tier: backend
    role: slave
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis-slave
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: redis
        role: slave
        tier: backend
    spec:
      containers:
      - name: slave
        image: gcr.io/google_samples/gb-redisslave:v1
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
        ports:
        - containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
  name: frontend
  labels:
    app: guestbook
    tier: frontend
spec:
  ports:
  - port: 80
  selector:
    app: guestbook
    tier: frontend
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: guestbook
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: gcr.io/google-samples/gb-frontend:v4
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
        ports:
        - containerPort: 80
`