package cmd

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"testing"

	"github.com/linkerd/linkerd2/controller/gen/config"
	pb "github.com/linkerd/linkerd2/controller/gen/config"
	"github.com/linkerd/linkerd2/pkg/k8s"
)

type testCase struct {
	inputFileName          string
	goldenFileName         string
	reportFileName         string
	injectProxy            bool
	testInjectConfig       *config.All
	overrideAnnotations    map[string]string
	enableDebugSidecarFlag bool
}

func mkFilename(filename string, verbose bool) string {
	if verbose {
		return fmt.Sprintf("%s.verbose", filename)
	}
	return filename
}

func testUninjectAndInject(t *testing.T, tc testCase) {
	file, err := os.Open("testdata/" + tc.inputFileName)
	if err != nil {
		t.Errorf("error opening test input file: %v\n", err)
	}

	read := bufio.NewReader(file)

	output := new(bytes.Buffer)
	report := new(bytes.Buffer)
	transformer := &resourceTransformerInject{
		injectProxy:         tc.injectProxy,
		configs:             tc.testInjectConfig,
		overrideAnnotations: tc.overrideAnnotations,
		enableDebugSidecar:  tc.enableDebugSidecarFlag,
	}

	if exitCode := uninjectAndInject([]io.Reader{read}, report, output, transformer); exitCode != 0 {
		t.Errorf("Unexpected error injecting YAML: %v\n", report)
	}
	diffTestdata(t, tc.goldenFileName, output.String())

	reportFileName := mkFilename(tc.reportFileName, verbose)
	diffTestdata(t, reportFileName, report.String())
}

func testInstallConfig() *pb.All {
	_, c, err := testInstallOptions().validateAndBuild("", nil)
	if err != nil {
		log.Fatalf("test install options must be valid: %s", err)
	}
	return c
}

func TestUninjectAndInject(t *testing.T) {
	defaultConfig := testInstallConfig()
	defaultConfig.Global.Version = "test-inject-control-plane-version"
	defaultConfig.Proxy.ProxyVersion = "test-inject-proxy-version"

	emptyVersionConfig := testInstallConfig()
	emptyVersionConfig.Global.Version = ""
	emptyVersionConfig.Proxy.ProxyVersion = ""

	emptyProxyVersionConfig := testInstallConfig()
	emptyProxyVersionConfig.Global.Version = "test-inject-control-plane-version"
	emptyProxyVersionConfig.Proxy.ProxyVersion = ""

	overrideConfig := testInstallConfig()
	overrideConfig.Proxy.ProxyVersion = "override"

	proxyResourceConfig := testInstallConfig()
	proxyResourceConfig.Proxy.ProxyVersion = defaultConfig.Proxy.ProxyVersion
	proxyResourceConfig.Proxy.Resource = &config.ResourceRequirements{
		RequestCpu:    "110m",
		RequestMemory: "100Mi",
		LimitCpu:      "160m",
		LimitMemory:   "150Mi",
	}

	noInitContainerConfig := testInstallConfig()
	noInitContainerConfig.Proxy.ProxyVersion = defaultConfig.Proxy.ProxyVersion
	noInitContainerConfig.Global.CniEnabled = true

	testCases := []testCase{
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_empty_version_config.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: emptyVersionConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_empty_proxy_version_config.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: emptyProxyVersionConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_overridden_noinject.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      false,
			testInjectConfig: defaultConfig,
			overrideAnnotations: map[string]string{
				k8s.ProxyAdminPortAnnotation: "1234",
			},
		},
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_overridden.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
			overrideAnnotations: map[string]string{
				k8s.ProxyAdminPortAnnotation: "1234",
			},
		},
		{
			inputFileName:    "inject_emojivoto_list.input.yml",
			goldenFileName:   "inject_emojivoto_list.golden.yml",
			reportFileName:   "inject_emojivoto_list.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_hostNetwork_false.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_hostNetwork_false.golden.yml",
			reportFileName:   "inject_emojivoto_deployment_hostNetwork_false.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_hostNetwork_true.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_hostNetwork_true.input.yml",
			reportFileName:   "inject_emojivoto_deployment_hostNetwork_true.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_injectDisabled.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_injectDisabled.input.yml",
			reportFileName:   "inject_emojivoto_deployment_injectDisabled.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_controller_name.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_controller_name.golden.yml",
			reportFileName:   "inject_emojivoto_deployment_controller_name.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_statefulset.input.yml",
			goldenFileName:   "inject_emojivoto_statefulset.golden.yml",
			reportFileName:   "inject_emojivoto_statefulset.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_pod.input.yml",
			goldenFileName:   "inject_emojivoto_pod.golden.yml",
			reportFileName:   "inject_emojivoto_pod.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_pod_with_requests.input.yml",
			goldenFileName:   "inject_emojivoto_pod_with_requests.golden.yml",
			reportFileName:   "inject_emojivoto_pod_with_requests.report",
			injectProxy:      true,
			testInjectConfig: proxyResourceConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_udp.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_udp.golden.yml",
			reportFileName:   "inject_emojivoto_deployment_udp.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_already_injected.input.yml",
			goldenFileName:   "inject_emojivoto_already_injected.golden.yml",
			reportFileName:   "inject_emojivoto_already_injected.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_istio.input.yml",
			goldenFileName:   "inject_emojivoto_istio.input.yml",
			reportFileName:   "inject_emojivoto_istio.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_contour.input.yml",
			goldenFileName:   "inject_contour.input.yml",
			reportFileName:   "inject_contour.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_empty_resources.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_empty_resources.golden.yml",
			reportFileName:   "inject_emojivoto_deployment_empty_resources.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_list_empty_resources.input.yml",
			goldenFileName:   "inject_emojivoto_list_empty_resources.golden.yml",
			reportFileName:   "inject_emojivoto_list_empty_resources.report",
			injectProxy:      true,
			testInjectConfig: defaultConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_no_init_container.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: noInitContainerConfig,
		},
		{
			inputFileName:    "inject_emojivoto_deployment_config_overrides.input.yml",
			goldenFileName:   "inject_emojivoto_deployment_config_overrides.golden.yml",
			reportFileName:   "inject_emojivoto_deployment.report",
			injectProxy:      true,
			testInjectConfig: overrideConfig,
		},
		{
			inputFileName:          "inject_emojivoto_deployment.input.yml",
			goldenFileName:         "inject_emojivoto_deployment_debug.golden.yml",
			reportFileName:         "inject_emojivoto_deployment.report",
			injectProxy:            true,
			testInjectConfig:       defaultConfig,
			enableDebugSidecarFlag: true,
		},
	}

	for i, tc := range testCases {
		tc := tc // pin
		verbose = true
		t.Run(fmt.Sprintf("%d: %s --verbose", i, tc.inputFileName), func(t *testing.T) {
			testUninjectAndInject(t, tc)
		})
		verbose = false
		t.Run(fmt.Sprintf("%d: %s", i, tc.inputFileName), func(t *testing.T) {
			testUninjectAndInject(t, tc)
		})
	}
}

type injectCmd struct {
	inputFileName        string
	stdErrGoldenFileName string
	stdOutGoldenFileName string
	exitCode             int
}

func testInjectCmd(t *testing.T, tc injectCmd) {
	testConfig := testInstallConfig()
	testConfig.Proxy.ProxyVersion = "testinjectversion"

	errBuffer := &bytes.Buffer{}
	outBuffer := &bytes.Buffer{}

	in, err := os.Open(fmt.Sprintf("testdata/%s", tc.inputFileName))
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	transformer := &resourceTransformerInject{
		injectProxy: true,
		configs:     testConfig,
	}
	exitCode := runInjectCmd([]io.Reader{in}, errBuffer, outBuffer, transformer)
	if exitCode != tc.exitCode {
		t.Fatalf("Expected exit code to be %d but got: %d", tc.exitCode, exitCode)
	}
	if tc.stdOutGoldenFileName != "" {
		diffTestdata(t, tc.stdOutGoldenFileName, outBuffer.String())
	} else if outBuffer.Len() != 0 {
		t.Fatalf("Expected no standard output, but got: %s", outBuffer)
	}

	stdErrGoldenFileName := mkFilename(tc.stdErrGoldenFileName, verbose)
	diffTestdata(t, stdErrGoldenFileName, errBuffer.String())
}

func TestRunInjectCmd(t *testing.T) {
	testCases := []injectCmd{
		{
			inputFileName:        "inject_gettest_deployment.bad.input.yml",
			stdErrGoldenFileName: "inject_gettest_deployment.bad.golden",
			exitCode:             1,
		},
		{
			inputFileName:        "inject_gettest_deployment.good.input.yml",
			stdOutGoldenFileName: "inject_gettest_deployment.good.golden.yml",
			stdErrGoldenFileName: "inject_gettest_deployment.good.golden.stderr",
			exitCode:             0,
		},
	}

	for i, tc := range testCases {
		tc := tc // pin
		verbose = true
		t.Run(fmt.Sprintf("%d: %s --verbose", i, tc.inputFileName), func(t *testing.T) {
			testInjectCmd(t, tc)
		})
		verbose = false
		t.Run(fmt.Sprintf("%d: %s", i, tc.inputFileName), func(t *testing.T) {
			testInjectCmd(t, tc)
		})
	}
}

type injectFilePath struct {
	resource     string
	resourceFile string
	expectedFile string
	stdErrFile   string
}

func testInjectFilePath(t *testing.T, tc injectFilePath) {
	in, err := read("testdata/" + tc.resourceFile)
	if err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	errBuf := &bytes.Buffer{}
	actual := &bytes.Buffer{}
	transformer := &resourceTransformerInject{
		injectProxy: true,
		configs:     testInstallConfig(),
	}
	if exitCode := runInjectCmd(in, errBuf, actual, transformer); exitCode != 0 {
		t.Fatal("Unexpected error. Exit code from runInjectCmd: ", exitCode)
	}
	diffTestdata(t, tc.expectedFile, actual.String())

	stdErrFile := mkFilename(tc.stdErrFile, verbose)
	diffTestdata(t, stdErrFile, errBuf.String())
}

func testReadFromFolder(t *testing.T, resourceFolder string, expectedFolder string) {
	in, err := read("testdata/" + resourceFolder)
	if err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	errBuf := &bytes.Buffer{}
	actual := &bytes.Buffer{}
	transformer := &resourceTransformerInject{
		injectProxy: true,
		configs:     testInstallConfig(),
	}
	if exitCode := runInjectCmd(in, errBuf, actual, transformer); exitCode != 0 {
		t.Fatal("Unexpected error. Exit code from runInjectCmd: ", exitCode)
	}

	expectedFile := filepath.Join(expectedFolder, "injected_nginx_redis.yaml")
	diffTestdata(t, expectedFile, actual.String())

	stdErrFileName := mkFilename(filepath.Join(expectedFolder, "injected_nginx_redis.stderr"), verbose)
	diffTestdata(t, stdErrFileName, errBuf.String())
}

func TestInjectFilePath(t *testing.T) {
	var (
		resourceFolder = filepath.Join("inject-filepath", "resources")
		expectedFolder = filepath.Join("inject-filepath", "expected")
	)

	t.Run("read from files", func(t *testing.T) {
		testCases := []injectFilePath{
			{
				resource:     "nginx",
				resourceFile: filepath.Join(resourceFolder, "nginx.yaml"),
				expectedFile: filepath.Join(expectedFolder, "injected_nginx.yaml"),
				stdErrFile:   filepath.Join(expectedFolder, "injected_nginx.stderr"),
			},
			{
				resource:     "redis",
				resourceFile: filepath.Join(resourceFolder, "db/redis.yaml"),
				expectedFile: filepath.Join(expectedFolder, "injected_redis.yaml"),
				stdErrFile:   filepath.Join(expectedFolder, "injected_redis.stderr"),
			},
		}

		for i, testCase := range testCases {
			testCase := testCase // pin
			verbose = true
			t.Run(fmt.Sprintf("%d %s", i, testCase.resource), func(t *testing.T) {
				testInjectFilePath(t, testCase)
			})
			verbose = false
			t.Run(fmt.Sprintf("%d %s", i, testCase.resource), func(t *testing.T) {
				testInjectFilePath(t, testCase)
			})
		}
	})

	verbose = true
	t.Run("read from folder --verbose", func(t *testing.T) {
		testReadFromFolder(t, resourceFolder, expectedFolder)
	})
	verbose = false
	t.Run("read from folder --verbose", func(t *testing.T) {
		testReadFromFolder(t, resourceFolder, expectedFolder)
	})
}

func TestWalk(t *testing.T) {
	// create two data files, one in the root folder and the other in a subfolder.
	// walk should be able to read the content of the two data files recursively.
	var (
		tmpFolderRoot = "linkerd-testdata"
		tmpFolderData = filepath.Join(tmpFolderRoot, "data")
	)

	if err := os.MkdirAll(tmpFolderData, os.ModeDir|os.ModePerm); err != nil {
		t.Fatal("Unexpected error: ", err)
	}
	defer os.RemoveAll(tmpFolderRoot)

	var (
		data  = []byte(readTestdata(t, "inject_gettest_deployment.bad.input.yml"))
		file1 = filepath.Join(tmpFolderRoot, "root.txt")
		file2 = filepath.Join(tmpFolderData, "data.txt")
	)
	if err := ioutil.WriteFile(file1, data, 0644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}
	if err := ioutil.WriteFile(file2, data, 0644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	actual, err := walk(tmpFolderRoot)
	if err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	for _, r := range actual {
		b := make([]byte, len(data))
		r.Read(b)

		if string(b) != string(data) {
			t.Errorf("Content mismatch. Expected %q, but got %q", data, b)
		}
	}
}