package command

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"reflect"
	"testing"

	"github.com/hashicorp/terraform/terraform"
	"github.com/mitchellh/cli"
)

func TestPlan(t *testing.T) {
	cwd, err := os.Getwd()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if err := os.Chdir(testFixturePath("plan")); err != nil {
		t.Fatalf("err: %s", err)
	}
	defer os.Chdir(cwd)

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}
}

func TestPlan_destroy(t *testing.T) {
	originalState := &terraform.State{
		Resources: map[string]*terraform.ResourceState{
			"test_instance.foo": &terraform.ResourceState{
				ID:   "bar",
				Type: "test_instance",
			},
		},
	}

	outPath := testTempFile(t)
	statePath := testStateFile(t, originalState)

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		"-destroy",
		"-out", outPath,
		"-state", statePath,
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}

	plan := testReadPlan(t, outPath)
	for _, r := range plan.Diff.Resources {
		if !r.Destroy {
			t.Fatalf("bad: %#v", r)
		}
	}

	f, err := os.Open(statePath + DefaultBackupExtention)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	backupState, err := terraform.ReadState(f)
	f.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if !reflect.DeepEqual(backupState, originalState) {
		t.Fatalf("bad: %#v", backupState)
	}
}
func TestPlan_noState(t *testing.T) {
	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	// Verify that refresh was called
	if p.RefreshCalled {
		t.Fatal("refresh should not be called")
	}

	// Verify that the provider was called with the existing state
	expectedState := &terraform.ResourceState{
		Type: "test_instance",
	}
	if !reflect.DeepEqual(p.DiffState, expectedState) {
		t.Fatalf("bad: %#v", p.DiffState)
	}
}

func TestPlan_outPath(t *testing.T) {
	tf, err := ioutil.TempFile("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	outPath := tf.Name()
	os.Remove(tf.Name())

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	p.DiffReturn = &terraform.ResourceDiff{
		Destroy: true,
	}

	args := []string{
		"-out", outPath,
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	f, err := os.Open(outPath)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	defer f.Close()

	if _, err := terraform.ReadPlan(f); err != nil {
		t.Fatalf("err: %s", err)
	}
}

func TestPlan_refresh(t *testing.T) {
	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		"-refresh=false",
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	if p.RefreshCalled {
		t.Fatal("refresh should not be called")
	}
}

func TestPlan_state(t *testing.T) {
	// Write out some prior state
	tf, err := ioutil.TempFile("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	statePath := tf.Name()
	defer os.Remove(tf.Name())

	originalState := &terraform.State{
		Resources: map[string]*terraform.ResourceState{
			"test_instance.foo": &terraform.ResourceState{
				ID:   "bar",
				Type: "test_instance",
			},
		},
	}

	err = terraform.WriteState(originalState, tf)
	tf.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		"-state", statePath,
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	// Verify that the provider was called with the existing state
	expectedState := originalState.Resources["test_instance.foo"]
	if !reflect.DeepEqual(p.DiffState, expectedState) {
		t.Fatalf("bad: %#v", p.DiffState)
	}
}

func TestPlan_stateDefault(t *testing.T) {
	originalState := &terraform.State{
		Resources: map[string]*terraform.ResourceState{
			"test_instance.foo": &terraform.ResourceState{
				ID:   "bar",
				Type: "test_instance",
			},
		},
	}

	// Write the state file in a temporary directory with the
	// default filename.
	td, err := ioutil.TempDir("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	statePath := filepath.Join(td, DefaultStateFilename)

	f, err := os.Create(statePath)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	err = terraform.WriteState(originalState, f)
	f.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Change to that directory
	cwd, err := os.Getwd()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if err := os.Chdir(filepath.Dir(statePath)); err != nil {
		t.Fatalf("err: %s", err)
	}
	defer os.Chdir(cwd)

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	// Verify that the provider was called with the existing state
	expectedState := originalState.Resources["test_instance.foo"]
	if !reflect.DeepEqual(p.DiffState, expectedState) {
		t.Fatalf("bad: %#v", p.DiffState)
	}
}

func TestPlan_vars(t *testing.T) {
	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	actual := ""
	p.DiffFn = func(
		s *terraform.ResourceState,
		c *terraform.ResourceConfig) (*terraform.ResourceDiff, error) {
		if v, ok := c.Config["value"]; ok {
			actual = v.(string)
		}

		return nil, nil
	}

	args := []string{
		"-var", "foo=bar",
		testFixturePath("plan-vars"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	if actual != "bar" {
		t.Fatal("didn't work")
	}
}

func TestPlan_varFile(t *testing.T) {
	varFilePath := testTempFile(t)
	if err := ioutil.WriteFile(varFilePath, []byte(planVarFile), 0644); err != nil {
		t.Fatalf("err: %s", err)
	}

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	actual := ""
	p.DiffFn = func(
		s *terraform.ResourceState,
		c *terraform.ResourceConfig) (*terraform.ResourceDiff, error) {
		if v, ok := c.Config["value"]; ok {
			actual = v.(string)
		}

		return nil, nil
	}

	args := []string{
		"-var-file", varFilePath,
		testFixturePath("plan-vars"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	if actual != "bar" {
		t.Fatal("didn't work")
	}
}

func TestPlan_backup(t *testing.T) {
	// Write out some prior state
	tf, err := ioutil.TempFile("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	statePath := tf.Name()
	defer os.Remove(tf.Name())

	// Write out some prior state
	backupf, err := ioutil.TempFile("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	backupPath := backupf.Name()
	backupf.Close()
	os.Remove(backupPath)
	defer os.Remove(backupPath)

	originalState := &terraform.State{
		Resources: map[string]*terraform.ResourceState{
			"test_instance.foo": &terraform.ResourceState{
				ID:   "bar",
				Type: "test_instance",
			},
		},
	}

	err = terraform.WriteState(originalState, tf)
	tf.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		"-state", statePath,
		"-backup", backupPath,
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	// Verify that the provider was called with the existing state
	expectedState := originalState.Resources["test_instance.foo"]
	if !reflect.DeepEqual(p.DiffState, expectedState) {
		t.Fatalf("bad: %#v", p.DiffState)
	}

	// Verify the backup exist
	f, err := os.Open(backupPath)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	backupState, err := terraform.ReadState(f)
	f.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if !reflect.DeepEqual(backupState, originalState) {
		t.Fatalf("bad: %#v", backupState)
	}
}

func TestPlan_disableBackup(t *testing.T) {
	// Write out some prior state
	tf, err := ioutil.TempFile("", "tf")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	statePath := tf.Name()
	defer os.Remove(tf.Name())

	originalState := &terraform.State{
		Resources: map[string]*terraform.ResourceState{
			"test_instance.foo": &terraform.ResourceState{
				ID:   "bar",
				Type: "test_instance",
			},
		},
	}

	err = terraform.WriteState(originalState, tf)
	tf.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	p := testProvider()
	ui := new(cli.MockUi)
	c := &PlanCommand{
		Meta: Meta{
			ContextOpts: testCtxConfig(p),
			Ui:          ui,
		},
	}

	args := []string{
		"-state", statePath,
		"-backup", "-",
		testFixturePath("plan"),
	}
	if code := c.Run(args); code != 0 {
		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
	}

	// Verify that the provider was called with the existing state
	expectedState := originalState.Resources["test_instance.foo"]
	if !reflect.DeepEqual(p.DiffState, expectedState) {
		t.Fatalf("bad: %#v", p.DiffState)
	}

	// Ensure there is no backup
	_, err = os.Stat(statePath + DefaultBackupExtention)
	if err == nil || !os.IsNotExist(err) {
		t.Fatalf("backup should not exist")
	}
}

const planVarFile = `
foo = "bar"
`