/*
 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

     https://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 executors_test

import (
	"bytes"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"opendev.org/airship/airshipctl/pkg/api/v1alpha1"
	"opendev.org/airship/airshipctl/pkg/cluster/clustermap"
	"opendev.org/airship/airshipctl/pkg/document"
	"opendev.org/airship/airshipctl/pkg/events"
	"opendev.org/airship/airshipctl/pkg/fs"
	"opendev.org/airship/airshipctl/pkg/k8s/kubeconfig"
	"opendev.org/airship/airshipctl/pkg/k8s/utils"
	"opendev.org/airship/airshipctl/pkg/phase/executors"
	"opendev.org/airship/airshipctl/pkg/phase/ifc"
	testfs "opendev.org/airship/airshipctl/testutil/fs"
)

const (
	ValidExecutorDoc = `apiVersion: airshipit.org/v1alpha1
kind: KubernetesApply
metadata:
  labels:
    airshipit.org/deploy-k8s: "false"
  name: kubernetes-apply
config:
  waitOptions:
    timeout: 600
  pruneOptions:
    prune: false
`
	ValidExecutorDocNamespaced = `apiVersion: airshipit.org/v1alpha1
kind: KubernetesApply
metadata:
  labels:
    airshipit.org/deploy-k8s: "false"
  name: kubernetes-apply-namespaced
  namespace: bundle
config:
  waitOptions:
    timeout: 600
  pruneOptions:
    prune: false
`
	testValidKubeconfig = `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ca-data
    server: https://10.0.1.7:6443
  name: kubernetes_target
contexts:
- context:
    cluster: kubernetes_target
    user: kubernetes-admin
  name: kubernetes-admin@kubernetes
current-context: ""
kind: Config
preferences: {}
users:
- name: kubernetes-admin
  user:
    client-certificate-data: cert-data
    client-key-data: client-keydata
`
)

func TestNewKubeApplierExecutor(t *testing.T) {
	tests := []struct {
		name          string
		cfgDoc        string
		expectedErr   string
		helper        ifc.Helper
		kubeconf      kubeconfig.Interface
		bundleFactory document.BundleFactoryFunc
	}{
		{
			name:          "valid executor",
			cfgDoc:        ValidExecutorDoc,
			kubeconf:      testKubeconfig(testValidKubeconfig),
			helper:        makeDefaultHelper(t, "../../k8s/applier/testdata"),
			bundleFactory: testBundleFactory("../../k8s/applier/testdata/source_bundle"),
		},
		{
			name: "wrong config document",
			cfgDoc: `apiVersion: v1
kind: ConfigMap
metadata:
  name: first-map
  namespace: default
  labels:
    cli-utils.sigs.k8s.io/inventory-id: "some id"`,
			expectedErr:   "wrong config document",
			helper:        makeDefaultHelper(t, "../../k8s/applier/testdata"),
			bundleFactory: testBundleFactory("../../k8s/applier/testdata/source_bundle"),
		},

		{
			name:          "path to bundle does not exist",
			cfgDoc:        ValidExecutorDoc,
			expectedErr:   "no such file or directory",
			kubeconf:      testKubeconfig(testValidKubeconfig),
			helper:        makeDefaultHelper(t, "../../k8s/applier/testdata"),
			bundleFactory: testBundleFactory("does not exist"),
		},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			doc, err := document.NewDocumentFromBytes([]byte(tt.cfgDoc))
			require.NoError(t, err)
			require.NotNil(t, doc)

			exec, err := executors.NewKubeApplierExecutor(
				ifc.ExecutorConfig{
					ExecutorDocument: doc,
					BundleFactory:    tt.bundleFactory,
					KubeConfig:       tt.kubeconf,
					Helper:           tt.helper,
				})
			if tt.expectedErr != "" {
				require.Error(t, err)
				assert.Contains(t, err.Error(), "")
				assert.Nil(t, exec)
			} else {
				require.NoError(t, err)
				require.NotNil(t, exec)
			}
		})
	}
}

// TODO We need valid test that checks that actual bundle has arrived to applier
// for that we need a way to inject fake applier, which is not doable with `black box` test currently
// since we tests are in different package from executor
func TestKubeApplierExecutorRun(t *testing.T) {
	tests := []struct {
		name        string
		containsErr string
		clusterName string

		kubeconf      kubeconfig.Interface
		execDoc       document.Document
		bundleFactory document.BundleFactoryFunc
		helper        ifc.Helper
		clusterMap    clustermap.ClusterMap
	}{
		{
			name:          "cant read kubeconfig error",
			containsErr:   "no such file or directory",
			helper:        makeDefaultHelper(t, "../../k8s/applier/testdata"),
			bundleFactory: testBundleFactory("../../k8s/applier/testdata/source_bundle"),
			kubeconf:      testKubeconfig(`invalid kubeconfig`),
			execDoc:       executorDoc(t, ValidExecutorDocNamespaced),
			clusterName:   "ephemeral-cluster",
			clusterMap: clustermap.NewClusterMap(&v1alpha1.ClusterMap{
				Map: map[string]*v1alpha1.Cluster{
					"ephemeral-cluster": {},
				},
			}),
		},
		{
			name:          "error cluster not defined",
			containsErr:   "cluster  is not defined in in cluster map",
			helper:        makeDefaultHelper(t, "../../k8s/applier/testdata"),
			bundleFactory: testBundleFactory("../../k8s/applier/testdata/source_bundle"),
			kubeconf:      testKubeconfig(testValidKubeconfig),
			execDoc:       executorDoc(t, ValidExecutorDocNamespaced),
			clusterMap:    clustermap.NewClusterMap(v1alpha1.DefaultClusterMap()),
		},
	}
	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			exec, err := executors.NewKubeApplierExecutor(
				ifc.ExecutorConfig{
					ExecutorDocument: tt.execDoc,
					Helper:           tt.helper,
					BundleFactory:    tt.bundleFactory,
					KubeConfig:       tt.kubeconf,
					ClusterMap:       tt.clusterMap,
					ClusterName:      tt.clusterName,
				})
			if tt.name == "Nil bundle provided" {
				require.Error(t, err)
				assert.Contains(t, err.Error(), tt.containsErr)
			} else {
				require.NoError(t, err)
				require.NotNil(t, exec)
				ch := make(chan events.Event)
				go exec.Run(ch, ifc.RunOptions{})
				processor := events.NewDefaultProcessor(utils.Streams())
				err = processor.Process(ch)
				if tt.containsErr != "" {
					require.Error(t, err)
					assert.Contains(t, err.Error(), tt.containsErr)
				} else {
					assert.NoError(t, err)
				}
			}
		})
	}
}

func TestRender(t *testing.T) {
	execDoc, err := document.NewDocumentFromBytes([]byte(ValidExecutorDoc))
	require.NoError(t, err)
	require.NotNil(t, execDoc)
	exec, err := executors.NewKubeApplierExecutor(ifc.ExecutorConfig{
		BundleFactory:    testBundleFactory("../../k8s/applier/testdata/source_bundle"),
		ExecutorDocument: execDoc,
	})
	require.NoError(t, err)
	require.NotNil(t, exec)

	writerReader := bytes.NewBuffer([]byte{})
	err = exec.Render(writerReader, ifc.RenderOptions{})
	require.NoError(t, err)

	result := writerReader.String()
	assert.Contains(t, result, "ReplicationController")
}

func testKubeconfig(stringData string) kubeconfig.Interface {
	return kubeconfig.NewKubeConfig(
		kubeconfig.FromByte([]byte(stringData)),
		kubeconfig.InjectFileSystem(
			testfs.MockFileSystem{
				MockTempFile: func(root, pattern string) (fs.File, error) {
					return testfs.TestFile{
						MockName:  func() string { return "kubeconfig-142398" },
						MockWrite: func() (int, error) { return 0, nil },
						MockClose: func() error { return nil },
					}, nil
				},
				MockRemoveAll: func() error { return nil },
			},
		))
}