package command

import (
	"os"
	"reflect"
	"testing"

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

func TestApply(t *testing.T) {
	statePath := testTempFile(t)

	p := testProvider()
	ui := new(cli.MockUi)
	c := &ApplyCommand{
		TFConfig: testTFConfig(p),
		Ui:       ui,
	}

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

	if _, err := os.Stat(statePath); err != nil {
		t.Fatalf("err: %s", err)
	}

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

	state, err := terraform.ReadState(f)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if state == nil {
		t.Fatal("state should not be nil")
	}
}

func TestApply_plan(t *testing.T) {
	planPath := testPlanFile(t, new(terraform.Plan))
	statePath := testTempFile(t)

	p := testProvider()
	ui := new(cli.MockUi)
	c := &ApplyCommand{
		TFConfig: testTFConfig(p),
		Ui:       ui,
	}

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

	if _, err := os.Stat(statePath); err != nil {
		t.Fatalf("err: %s", err)
	}

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

	state, err := terraform.ReadState(f)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if state == nil {
		t.Fatal("state should not be nil")
	}
}

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

	statePath := testStateFile(t, originalState)

	p := testProvider()
	p.DiffReturn = &terraform.ResourceDiff{
		Attributes: map[string]*terraform.ResourceAttrDiff{
			"ami": &terraform.ResourceAttrDiff{
				New: "bar",
			},
		},
	}

	ui := new(cli.MockUi)
	c := &ApplyCommand{
		TFConfig: testTFConfig(p),
		Ui:       ui,
	}

	// Run the apply command pointing to our existing state
	args := []string{
		statePath,
		testFixturePath("apply"),
	}
	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)
	}

	if !reflect.DeepEqual(p.ApplyState, expectedState) {
		t.Fatalf("bad: %#v", p.ApplyState)
	}

	// Verify a new state exists
	if _, err := os.Stat(statePath); err != nil {
		t.Fatalf("err: %s", err)
	}

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

	state, err := terraform.ReadState(f)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if state == nil {
		t.Fatal("state should not be nil")
	}
}

func TestApply_stateNoExist(t *testing.T) {
	p := testProvider()
	ui := new(cli.MockUi)
	c := &ApplyCommand{
		TFConfig: testTFConfig(p),
		Ui:       ui,
	}

	args := []string{
		"idontexist.tfstate",
		testFixturePath("apply"),
	}
	if code := c.Run(args); code != 1 {
		t.Fatalf("bad: \n%s", ui.OutputWriter.String())
	}
}