package java

import (
	"context"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/hashicorp/nomad/ci"
	dtestutil "github.com/hashicorp/nomad/plugins/drivers/testutils"

	ctestutil "github.com/hashicorp/nomad/client/testutil"
	"github.com/hashicorp/nomad/helper/pluginutils/hclutils"
	"github.com/hashicorp/nomad/helper/testlog"
	"github.com/hashicorp/nomad/helper/uuid"
	"github.com/hashicorp/nomad/nomad/structs"
	"github.com/hashicorp/nomad/plugins/drivers"
	"github.com/hashicorp/nomad/testutil"
	"github.com/stretchr/testify/require"
)

func javaCompatible(t *testing.T) {
	ctestutil.JavaCompatible(t)

	_, _, _, err := javaVersionInfo()
	if err != nil {
		t.Skipf("java not found; skipping: %v", err)
	}
}

func TestJavaDriver_Fingerprint(t *testing.T) {
	ci.Parallel(t)
	javaCompatible(t)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)

	fpCh, err := harness.Fingerprint(context.Background())
	require.NoError(t, err)

	select {
	case fp := <-fpCh:
		require.Equal(t, drivers.HealthStateHealthy, fp.Health)
		detected, _ := fp.Attributes["driver.java"].GetBool()
		require.True(t, detected)
	case <-time.After(time.Duration(testutil.TestMultiplier()*5) * time.Second):
		require.Fail(t, "timeout receiving fingerprint")
	}
}

func TestJavaDriver_Jar_Start_Wait(t *testing.T) {
	ci.Parallel(t)
	javaCompatible(t)

	require := require.New(t)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)

	tc := &TaskConfig{
		JarPath: "demoapp.jar",
		Args:    []string{"1"},
		JvmOpts: []string{"-Xmx64m", "-Xms32m"},
	}
	task := basicTask(t, "demo-app", tc)

	cleanup := harness.MkAllocDir(task, true)
	defer cleanup()

	copyFile("./test-resources/demoapp.jar", filepath.Join(task.TaskDir().Dir, "demoapp.jar"), t)

	handle, _, err := harness.StartTask(task)
	require.NoError(err)

	ch, err := harness.WaitTask(context.Background(), handle.Config.ID)
	require.NoError(err)
	result := <-ch
	require.Nil(result.Err)

	require.Zero(result.ExitCode)

	// Get the stdout of the process and assert that it's not empty
	stdout, err := ioutil.ReadFile(filepath.Join(task.TaskDir().LogDir, "demo-app.stdout.0"))
	require.NoError(err)
	require.Contains(string(stdout), "Hello")

	require.NoError(harness.DestroyTask(task.ID, true))
}

func TestJavaDriver_Jar_Stop_Wait(t *testing.T) {
	ci.Parallel(t)
	javaCompatible(t)

	require := require.New(t)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)

	tc := &TaskConfig{
		JarPath: "demoapp.jar",
		Args:    []string{"600"},
		JvmOpts: []string{"-Xmx64m", "-Xms32m"},
	}
	task := basicTask(t, "demo-app", tc)

	cleanup := harness.MkAllocDir(task, true)
	defer cleanup()

	copyFile("./test-resources/demoapp.jar", filepath.Join(task.TaskDir().Dir, "demoapp.jar"), t)

	handle, _, err := harness.StartTask(task)
	require.NoError(err)

	ch, err := harness.WaitTask(context.Background(), handle.Config.ID)
	require.NoError(err)

	require.NoError(harness.WaitUntilStarted(task.ID, 1*time.Second))

	go func() {
		time.Sleep(10 * time.Millisecond)
		harness.StopTask(task.ID, 2*time.Second, "SIGINT")
	}()

	select {
	case result := <-ch:
		require.False(result.Successful())
	case <-time.After(10 * time.Second):
		require.Fail("timeout waiting for task to shutdown")
	}

	// Ensure that the task is marked as dead, but account
	// for WaitTask() closing channel before internal state is updated
	testutil.WaitForResult(func() (bool, error) {
		status, err := harness.InspectTask(task.ID)
		if err != nil {
			return false, fmt.Errorf("inspecting task failed: %v", err)
		}
		if status.State != drivers.TaskStateExited {
			return false, fmt.Errorf("task hasn't exited yet; status: %v", status.State)
		}

		return true, nil
	}, func(err error) {
		require.NoError(err)
	})

	require.NoError(harness.DestroyTask(task.ID, true))
}

func TestJavaDriver_Class_Start_Wait(t *testing.T) {
	ci.Parallel(t)
	javaCompatible(t)

	require := require.New(t)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)

	tc := &TaskConfig{
		Class: "Hello",
		Args:  []string{"1"},
	}
	task := basicTask(t, "demo-app", tc)

	cleanup := harness.MkAllocDir(task, true)
	defer cleanup()

	copyFile("./test-resources/Hello.class", filepath.Join(task.TaskDir().Dir, "Hello.class"), t)

	handle, _, err := harness.StartTask(task)
	require.NoError(err)

	ch, err := harness.WaitTask(context.Background(), handle.Config.ID)
	require.NoError(err)
	result := <-ch
	require.Nil(result.Err)

	require.Zero(result.ExitCode)

	// Get the stdout of the process and assert that it's not empty
	stdout, err := ioutil.ReadFile(filepath.Join(task.TaskDir().LogDir, "demo-app.stdout.0"))
	require.NoError(err)
	require.Contains(string(stdout), "Hello")

	require.NoError(harness.DestroyTask(task.ID, true))
}

func TestJavaCmdArgs(t *testing.T) {
	ci.Parallel(t)

	cases := []struct {
		name     string
		cfg      TaskConfig
		expected []string
	}{
		{
			"jar_path_full",
			TaskConfig{
				JvmOpts: []string{"-Xmx512m", "-Xms128m"},
				JarPath: "/jar-path.jar",
				Args:    []string{"hello", "world"},
			},
			[]string{"-Xmx512m", "-Xms128m", "-jar", "/jar-path.jar", "hello", "world"},
		},
		{
			"class_full",
			TaskConfig{
				JvmOpts:   []string{"-Xmx512m", "-Xms128m"},
				Class:     "ClassName",
				ClassPath: "/classpath",
				Args:      []string{"hello", "world"},
			},
			[]string{"-Xmx512m", "-Xms128m", "-cp", "/classpath", "ClassName", "hello", "world"},
		},
		{
			"jar_path_slim",
			TaskConfig{
				JarPath: "/jar-path.jar",
			},
			[]string{"-jar", "/jar-path.jar"},
		},
		{
			"class_slim",
			TaskConfig{
				Class: "ClassName",
			},
			[]string{"ClassName"},
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			found := javaCmdArgs(c.cfg)
			require.Equal(t, c.expected, found)
		})
	}
}

func TestJavaDriver_ExecTaskStreaming(t *testing.T) {
	ci.Parallel(t)
	javaCompatible(t)

	require := require.New(t)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)
	defer harness.Kill()

	tc := &TaskConfig{
		Class: "Hello",
		Args:  []string{"900"},
	}
	task := basicTask(t, "demo-app", tc)

	cleanup := harness.MkAllocDir(task, true)
	defer cleanup()

	copyFile("./test-resources/Hello.class", filepath.Join(task.TaskDir().Dir, "Hello.class"), t)

	_, _, err := harness.StartTask(task)
	require.NoError(err)
	defer d.DestroyTask(task.ID, true)

	dtestutil.ExecTaskStreamingConformanceTests(t, harness, task.ID)

}
func basicTask(t *testing.T, name string, taskConfig *TaskConfig) *drivers.TaskConfig {
	t.Helper()

	task := &drivers.TaskConfig{
		ID:   uuid.Generate(),
		Name: name,
		Resources: &drivers.Resources{
			NomadResources: &structs.AllocatedTaskResources{
				Memory: structs.AllocatedMemoryResources{
					MemoryMB: 128,
				},
				Cpu: structs.AllocatedCpuResources{
					CpuShares: 100,
				},
			},
			LinuxResources: &drivers.LinuxResources{
				MemoryLimitBytes: 134217728,
				CPUShares:        100,
			},
		},
	}

	require.NoError(t, task.EncodeConcreteDriverConfig(&taskConfig))
	return task
}

// copyFile moves an existing file to the destination
func copyFile(src, dst string, t *testing.T) {
	in, err := os.Open(src)
	if err != nil {
		t.Fatalf("copying %v -> %v failed: %v", src, dst, err)
	}
	defer in.Close()
	out, err := os.Create(dst)
	if err != nil {
		t.Fatalf("copying %v -> %v failed: %v", src, dst, err)
	}
	defer func() {
		if err := out.Close(); err != nil {
			t.Fatalf("copying %v -> %v failed: %v", src, dst, err)
		}
	}()
	if _, err = io.Copy(out, in); err != nil {
		t.Fatalf("copying %v -> %v failed: %v", src, dst, err)
	}
}

func TestConfig_ParseAllHCL(t *testing.T) {
	ci.Parallel(t)

	cfgStr := `
config {
  class = "java.main"
  class_path = "/tmp/cp"
  jar_path = "/tmp/jar.jar"
  jvm_options = ["-Xmx600"]
  args = ["arg1", "arg2"]
}`

	expected := &TaskConfig{
		Class:     "java.main",
		ClassPath: "/tmp/cp",
		JarPath:   "/tmp/jar.jar",
		JvmOpts:   []string{"-Xmx600"},
		Args:      []string{"arg1", "arg2"},
	}

	var tc *TaskConfig
	hclutils.NewConfigParser(taskConfigSpec).ParseHCL(t, cfgStr, &tc)

	require.EqualValues(t, expected, tc)
}

// Tests that a given DNSConfig properly configures dns
func Test_dnsConfig(t *testing.T) {
	ci.Parallel(t)
	ctestutil.RequireRoot(t)
	javaCompatible(t)
	require := require.New(t)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	d := NewDriver(ctx, testlog.HCLogger(t))
	harness := dtestutil.NewDriverHarness(t, d)
	defer harness.Kill()

	cases := []struct {
		name string
		cfg  *drivers.DNSConfig
	}{
		{
			name: "nil DNSConfig",
		},
		{
			name: "basic",
			cfg: &drivers.DNSConfig{
				Servers: []string{"1.1.1.1", "1.0.0.1"},
			},
		},
		{
			name: "full",
			cfg: &drivers.DNSConfig{
				Servers:  []string{"1.1.1.1", "1.0.0.1"},
				Searches: []string{"local.test", "node.consul"},
				Options:  []string{"ndots:2", "edns0"},
			},
		},
	}

	for _, c := range cases {
		tc := &TaskConfig{
			Class: "Hello",
			Args:  []string{"900"},
		}
		task := basicTask(t, "demo-app", tc)
		task.DNS = c.cfg

		cleanup := harness.MkAllocDir(task, false)
		defer cleanup()

		_, _, err := harness.StartTask(task)
		require.NoError(err)
		defer d.DestroyTask(task.ID, true)

		dtestutil.TestTaskDNSConfig(t, harness, task.ID, c.cfg)
	}

}

func TestDriver_Config_validate(t *testing.T) {
	ci.Parallel(t)

	t.Run("pid/ipc", func(t *testing.T) {
		for _, tc := range []struct {
			pidMode, ipcMode string
			exp              error
		}{
			{pidMode: "host", ipcMode: "host", exp: nil},
			{pidMode: "private", ipcMode: "host", exp: nil},
			{pidMode: "host", ipcMode: "private", exp: nil},
			{pidMode: "private", ipcMode: "private", exp: nil},
			{pidMode: "other", ipcMode: "private", exp: errors.New(`default_pid_mode must be "private" or "host", got "other"`)},
			{pidMode: "private", ipcMode: "other", exp: errors.New(`default_ipc_mode must be "private" or "host", got "other"`)},
		} {
			require.Equal(t, tc.exp, (&Config{
				DefaultModePID: tc.pidMode,
				DefaultModeIPC: tc.ipcMode,
			}).validate())
		}
	})

	t.Run("allow_caps", func(t *testing.T) {
		for _, tc := range []struct {
			ac  []string
			exp error
		}{
			{ac: []string{}, exp: nil},
			{ac: []string{"all"}, exp: nil},
			{ac: []string{"chown", "sys_time"}, exp: nil},
			{ac: []string{"CAP_CHOWN", "cap_sys_time"}, exp: nil},
			{ac: []string{"chown", "not_valid", "sys_time"}, exp: errors.New("allow_caps configured with capabilities not supported by system: not_valid")},
		} {
			require.Equal(t, tc.exp, (&Config{
				DefaultModePID: "private",
				DefaultModeIPC: "private",
				AllowCaps:      tc.ac,
			}).validate())
		}
	})
}

func TestDriver_TaskConfig_validate(t *testing.T) {
	ci.Parallel(t)

	t.Run("pid/ipc", func(t *testing.T) {
		for _, tc := range []struct {
			pidMode, ipcMode string
			exp              error
		}{
			{pidMode: "host", ipcMode: "host", exp: nil},
			{pidMode: "host", ipcMode: "private", exp: nil},
			{pidMode: "host", ipcMode: "", exp: nil},
			{pidMode: "host", ipcMode: "other", exp: errors.New(`ipc_mode must be "private" or "host", got "other"`)},

			{pidMode: "host", ipcMode: "host", exp: nil},
			{pidMode: "private", ipcMode: "host", exp: nil},
			{pidMode: "", ipcMode: "host", exp: nil},
			{pidMode: "other", ipcMode: "host", exp: errors.New(`pid_mode must be "private" or "host", got "other"`)},
		} {
			require.Equal(t, tc.exp, (&TaskConfig{
				ModePID: tc.pidMode,
				ModeIPC: tc.ipcMode,
			}).validate())
		}
	})

	t.Run("cap_add", func(t *testing.T) {
		for _, tc := range []struct {
			adds []string
			exp  error
		}{
			{adds: nil, exp: nil},
			{adds: []string{"chown"}, exp: nil},
			{adds: []string{"CAP_CHOWN"}, exp: nil},
			{adds: []string{"chown", "sys_time"}, exp: nil},
			{adds: []string{"chown", "not_valid", "sys_time"}, exp: errors.New("cap_add configured with capabilities not supported by system: not_valid")},
		} {
			require.Equal(t, tc.exp, (&TaskConfig{
				CapAdd: tc.adds,
			}).validate())
		}
	})

	t.Run("cap_drop", func(t *testing.T) {
		for _, tc := range []struct {
			drops []string
			exp   error
		}{
			{drops: nil, exp: nil},
			{drops: []string{"chown"}, exp: nil},
			{drops: []string{"CAP_CHOWN"}, exp: nil},
			{drops: []string{"chown", "sys_time"}, exp: nil},
			{drops: []string{"chown", "not_valid", "sys_time"}, exp: errors.New("cap_drop configured with capabilities not supported by system: not_valid")},
		} {
			require.Equal(t, tc.exp, (&TaskConfig{
				CapDrop: tc.drops,
			}).validate())
		}
	})
}