//go:build integration

/*
Copyright 2019 The Kubernetes 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 integration

import (
	"bufio"
	"bytes"
	"context"
	"crypto/md5"
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strings"
	"testing"

	"k8s.io/minikube/pkg/minikube/bootstrapper/images"
	"k8s.io/minikube/pkg/minikube/constants"
	"k8s.io/minikube/pkg/minikube/download"
	"k8s.io/minikube/pkg/minikube/localpath"
)

// TestDownloadOnly makes sure the --download-only parameter in minikube start caches the appropriate images and tarballs.
func TestDownloadOnly(t *testing.T) {
	// Stores the startup run result for later error messages
	var rrr *RunResult
	profile := UniqueProfileName("download-only")
	ctx, cancel := context.WithTimeout(context.Background(), Minutes(30))
	defer Cleanup(t, profile, cancel)
	containerRuntime := ContainerRuntime()

	versions := []string{
		constants.OldestKubernetesVersion,
		constants.DefaultKubernetesVersion,
		constants.NewestKubernetesVersion,
	}

	// Small optimization, don't run the exact same set of tests twice
	if constants.DefaultKubernetesVersion == constants.NewestKubernetesVersion {
		versions = versions[:len(versions)-1]
	}

	for _, v := range versions {
		t.Run(v, func(t *testing.T) {
			defer PostMortemLogs(t, profile)

			t.Run("json-events", func(t *testing.T) {
				// --force to avoid uid check
				args := append([]string{"start", "-o=json", "--download-only", "-p", profile, "--force", "--alsologtostderr", fmt.Sprintf("--kubernetes-version=%s", v), fmt.Sprintf("--container-runtime=%s", containerRuntime)}, StartArgs()...)
				rt, err := Run(t, exec.CommandContext(ctx, Target(), args...))
				if rrr == nil {
					// Preserve the initial run-result for debugging
					rrr = rt
				}
				if err != nil {
					t.Errorf("failed to download only. args: %q %v", args, err)
				}

				s := bufio.NewScanner(bytes.NewReader(rt.Stdout.Bytes()))
				for s.Scan() {
					var rtObj map[string]interface{}
					err := json.Unmarshal(s.Bytes(), &rtObj)
					if err != nil {
						t.Errorf("failed to parse output: %v", err)
					} else if step, ok := rtObj["data"]; ok {
						if stepMap, ok := step.(map[string]interface{}); ok {
							if stepMap["currentstep"] == "" {
								t.Errorf("Empty step number for %v", stepMap["name"])
							}
						}
					}
				}
			})

			preloadExists := false
			t.Run("preload-exists", func(t *testing.T) {
				// skip for none, as none driver does not have preload feature.
				if NoneDriver() {
					t.Skip("None driver does not have preload")
				}
				// Driver does not matter here, since the only exception is none driver,
				// which cannot occur here.
				if download.PreloadExists(v, containerRuntime, "docker", true) {
					// Just make sure the tarball path exists
					if _, err := os.Stat(download.TarballPath(v, containerRuntime)); err != nil {
						t.Errorf("failed to verify preloaded tarball file exists: %v", err)
					}
					preloadExists = true
				} else {
					t.Skip("No preload image")
				}
			})

			t.Run("cached-images", func(t *testing.T) {
				// skip verify for cache images if --driver=none
				if NoneDriver() {
					t.Skip("None driver has no cache")
				}
				if preloadExists {
					t.Skip("Preload exists, images won't be cached")
				}
				imgs, err := images.Kubeadm("", v)
				if err != nil {
					t.Errorf("failed to get kubeadm images for %v: %+v", v, err)
				}

				for _, img := range imgs {
					img = strings.Replace(img, ":", "_", 1) // for example kube-scheduler:v1.15.2 --> kube-scheduler_v1.15.2
					fp := filepath.Join(localpath.MiniPath(), "cache", "images", img)
					_, err := os.Stat(fp)
					if err != nil {
						t.Errorf("expected image file exist at %q but got error: %v", fp, err)
					}
				}
			})

			t.Run("binaries", func(t *testing.T) {
				if preloadExists {
					t.Skip("Preload exists, binaries are present within.")
				}
				// checking binaries downloaded (kubelet,kubeadm)
				for _, bin := range constants.KubernetesReleaseBinaries {
					fp := filepath.Join(localpath.MiniPath(), "cache", "linux", runtime.GOARCH, v, bin)
					_, err := os.Stat(fp)
					if err != nil {
						t.Errorf("expected the file for binary exist at %q but got error %v", fp, err)
					}
				}
			})

			t.Run("kubectl", func(t *testing.T) {
				// If we are on darwin/windows, check to make sure OS specific kubectl has been downloaded
				// as well for the `minikube kubectl` command
				if runtime.GOOS == "linux" {
					t.Skip("Test for darwin and windows")
				}
				binary := "kubectl"
				if runtime.GOOS == "windows" {
					binary = "kubectl.exe"
				}
				fp := filepath.Join(localpath.MiniPath(), "cache", runtime.GOOS, runtime.GOARCH, v, binary)
				if _, err := os.Stat(fp); err != nil {
					t.Errorf("expected the file for binary exist at %q but got error %v", fp, err)
				}
			})

			// checks if the duration of `minikube logs` takes longer than 5 seconds
			t.Run("LogsDuration", func(t *testing.T) {
				ctx, cancel := context.WithTimeout(context.Background(), Seconds(5))
				defer cancel()
				args := []string{"logs", "-p", profile}
				if _, err := Run(t, exec.CommandContext(ctx, Target(), args...)); err != nil {
					t.Logf("minikube logs failed with error: %v", err)
				}
				if err := ctx.Err(); err == context.DeadlineExceeded {
					t.Error("minikube logs expected to finish by 5 seconds, but took longer")
				}
			})

		})
	}

	// This is a weird place to test profile deletion, but this test is serial, and we have a profile to delete!
	t.Run("DeleteAll", func(t *testing.T) {
		defer PostMortemLogs(t, profile)

		if !CanCleanup() {
			t.Skip("skipping, as cleanup is disabled")
		}
		rr, err := Run(t, exec.CommandContext(ctx, Target(), "delete", "--all"))
		if err != nil {
			t.Errorf("failed to delete all. args: %q : %v", rr.Command(), err)
		}
	})
	// Delete should always succeed, even if previously partially or fully deleted.
	t.Run("DeleteAlwaysSucceeds", func(t *testing.T) {
		defer PostMortemLogs(t, profile)

		if !CanCleanup() {
			t.Skip("skipping, as cleanup is disabled")
		}
		rr, err := Run(t, exec.CommandContext(ctx, Target(), "delete", "-p", profile))
		if err != nil {
			t.Errorf("failed to delete. args: %q: %v", rr.Command(), err)
		}
	})

}

// TestDownloadOnlyKic makes sure --download-only caches the docker driver images as well.
func TestDownloadOnlyKic(t *testing.T) {
	if !KicDriver() {
		t.Skip("skipping, only for docker or podman driver")
	}
	profile := UniqueProfileName("download-docker")
	ctx, cancel := context.WithTimeout(context.Background(), Minutes(15))
	defer Cleanup(t, profile, cancel)

	cRuntime := ContainerRuntime()

	args := []string{"start", "--download-only", "-p", profile, "--force", "--alsologtostderr"}
	args = append(args, StartArgs()...)

	cmd := exec.CommandContext(ctx, Target(), args...)
	// make sure this works even if docker daemon isn't running
	cmd.Env = append(os.Environ(), "DOCKER_HOST=/does/not/exist")
	if _, err := Run(t, cmd); err != nil {
		t.Errorf("start with download only failed %q : %v", args, err)
	}

	// Make sure the downloaded image tarball exists
	tarball := download.TarballPath(constants.DefaultKubernetesVersion, cRuntime)
	contents, err := os.ReadFile(tarball)
	if err != nil {
		t.Errorf("failed to read tarball file %q: %v", tarball, err)
	}

	if arm64Platform() {
		t.Skip("Skip for arm64 platform. See https://github.com/kubernetes/minikube/issues/10144")
	}
	// Make sure it has the correct checksum
	checksum := md5.Sum(contents)
	remoteChecksum, err := os.ReadFile(download.PreloadChecksumPath(constants.DefaultKubernetesVersion, cRuntime))
	if err != nil {
		t.Errorf("failed to read checksum file %q : %v", download.PreloadChecksumPath(constants.DefaultKubernetesVersion, cRuntime), err)
	}
	if string(remoteChecksum) != string(checksum[:]) {
		t.Errorf("failed to verify checksum. checksum of %q does not match remote checksum (%q != %q)", tarball, string(remoteChecksum), string(checksum[:]))
	}
}

// createSha256File is a helper function which creates sha256 checksum file from given file
func createSha256File(filePath string) error {
	dat, _ := os.ReadFile(filePath)
	sum := sha256.Sum256(dat)

	f, err := os.Create(filePath + ".sha256")
	if err != nil {
		return err
	}
	defer f.Close()

	_, err = f.WriteString(fmt.Sprintf("%x", sum[:]))
	if err != nil {
		return err
	}
	return nil
}

// TestBinaryMirror tests functionality of --binary-mirror flag
func TestBinaryMirror(t *testing.T) {
	profile := UniqueProfileName("binary-mirror")
	ctx, cancel := context.WithTimeout(context.Background(), Minutes(10))
	defer Cleanup(t, profile, cancel)

	tmpDir := t.TempDir()

	// Start test server which will serve binary files
	ts := httptest.NewServer(
		http.FileServer(http.Dir(tmpDir)),
	)
	defer ts.Close()

	binaryName := "kubectl"
	if runtime.GOOS == "windows" {
		binaryName = "kubectl.exe"
	}
	binaryPath, err := download.Binary(binaryName, constants.DefaultKubernetesVersion, runtime.GOOS, runtime.GOARCH, "")
	if err != nil {
		t.Errorf("Failed to download binary: %+v", err)
	}

	newBinaryDir := filepath.Join(tmpDir, constants.DefaultKubernetesVersion, "bin", runtime.GOOS, runtime.GOARCH)
	if err := os.MkdirAll(newBinaryDir, os.ModePerm); err != nil {
		t.Errorf("Failed to create %s directories", newBinaryDir)
	}

	newBinaryPath := filepath.Join(newBinaryDir, binaryName)
	if err := os.Rename(binaryPath, newBinaryPath); err != nil {
		t.Errorf("Failed to move binary file: %+v", err)
	}
	if err := createSha256File(newBinaryPath); err != nil {
		t.Errorf("Failed to generate sha256 checksum file: %+v", err)
	}

	args := append([]string{"start", "--download-only", "-p", profile, "--alsologtostderr", "--binary-mirror", ts.URL}, StartArgs()...)

	cmd := exec.CommandContext(ctx, Target(), args...)
	if _, err := Run(t, cmd); err != nil {
		t.Errorf("start with --binary-mirror failed %q : %v", args, err)
	}
}
