/*
Copyright 2014 The Kubernetes 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 libdocker

import (
	"fmt"
	"hash/adler32"
	"testing"

	dockertypes "github.com/docker/docker/api/types"
	"github.com/stretchr/testify/assert"
	"k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/types"
	hashutil "k8s.io/kubernetes/pkg/util/hash"
)

func verifyCalls(t *testing.T, fakeDocker *FakeDockerClient, calls []string) {
	assert.New(t).NoError(fakeDocker.AssertCalls(calls))
}

func verifyStringArrayEquals(t *testing.T, actual, expected []string) {
	invalid := len(actual) != len(expected)
	if !invalid {
		for ix, value := range actual {
			if expected[ix] != value {
				invalid = true
			}
		}
	}
	if invalid {
		t.Errorf("Expected: %#v, Actual: %#v", expected, actual)
	}
}

func findPodContainer(dockerContainers []*dockertypes.Container, podFullName string, uid types.UID, containerName string) (*dockertypes.Container, bool, uint64) {
	for _, dockerContainer := range dockerContainers {
		if len(dockerContainer.Names) == 0 {
			continue
		}
		dockerName, hash, err := ParseDockerName(dockerContainer.Names[0])
		if err != nil {
			continue
		}
		if dockerName.PodFullName == podFullName &&
			(uid == "" || dockerName.PodUID == uid) &&
			dockerName.ContainerName == containerName {
			return dockerContainer, true, hash
		}
	}
	return nil, false, 0
}

func TestGetContainerID(t *testing.T) {
	fakeDocker := NewFakeDockerClient()
	fakeDocker.SetFakeRunningContainers([]*FakeContainer{
		{
			ID:   "foobar",
			Name: "/k8s_foo_qux_ns_1234_42",
		},
		{
			ID:   "barbar",
			Name: "/k8s_bar_qux_ns_2565_42",
		},
	})

	dockerContainers, err := GetKubeletDockerContainers(fakeDocker, false)
	if err != nil {
		t.Errorf("Expected no error, Got %#v", err)
	}
	if len(dockerContainers) != 2 {
		t.Errorf("Expected %#v, Got %#v", fakeDocker.RunningContainerList, dockerContainers)
	}
	verifyCalls(t, fakeDocker, []string{"list"})

	dockerContainer, found, _ := findPodContainer(dockerContainers, "qux_ns", "", "foo")
	if dockerContainer == nil || !found {
		t.Errorf("Failed to find container %#v", dockerContainer)
	}

	fakeDocker.ClearCalls()
	dockerContainer, found, _ = findPodContainer(dockerContainers, "foobar", "", "foo")
	verifyCalls(t, fakeDocker, []string{})
	if dockerContainer != nil || found {
		t.Errorf("Should not have found container %#v", dockerContainer)
	}
}

func verifyPackUnpack(t *testing.T, podNamespace, podUID, podName, containerName string) {
	container := &v1.Container{Name: containerName}
	hasher := adler32.New()
	hashutil.DeepHashObject(hasher, *container)
	computedHash := uint64(hasher.Sum32())
	podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)
	_, name, _ := BuildDockerName(KubeletContainerName{podFullName, types.UID(podUID), container.Name}, container)
	returned, hash, err := ParseDockerName(name)
	if err != nil {
		t.Errorf("Failed to parse Docker container name %q: %v", name, err)
	}
	if podFullName != returned.PodFullName || podUID != string(returned.PodUID) || containerName != returned.ContainerName || computedHash != hash {
		t.Errorf("For (%s, %s, %s, %d), unpacked (%s, %s, %s, %d)", podFullName, podUID, containerName, computedHash, returned.PodFullName, returned.PodUID, returned.ContainerName, hash)
	}
}

func TestContainerNaming(t *testing.T) {
	podUID := "12345678"
	verifyPackUnpack(t, "file", podUID, "name", "container")
	verifyPackUnpack(t, "file", podUID, "name-with-dashes", "container")
	// UID is same as pod name
	verifyPackUnpack(t, "file", podUID, podUID, "container")
	// No Container name
	verifyPackUnpack(t, "other", podUID, "name", "")

	container := &v1.Container{Name: "container"}
	podName := "foo"
	podNamespace := "test"
	name := fmt.Sprintf("k8s_%s_%s_%s_%s_42", container.Name, podName, podNamespace, podUID)
	podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)

	returned, hash, err := ParseDockerName(name)
	if err != nil {
		t.Errorf("Failed to parse Docker container name %q: %v", name, err)
	}
	if returned.PodFullName != podFullName || string(returned.PodUID) != podUID || returned.ContainerName != container.Name || hash != 0 {
		t.Errorf("unexpected parse: %s %s %s %d", returned.PodFullName, returned.PodUID, returned.ContainerName, hash)
	}
}