package packer

import (
	"bytes"
	"errors"
	"io/ioutil"
	"log"
	"os"
	"reflect"
	"strings"
	"testing"
)

func init() {
	// Disable log output for tests
	log.SetOutput(ioutil.Discard)
}

func testComponentFinder() *ComponentFinder {
	builderFactory := func(n string) (Builder, error) { return new(MockBuilder), nil }
	ppFactory := func(n string) (PostProcessor, error) { return new(TestPostProcessor), nil }
	provFactory := func(n string) (Provisioner, error) { return new(MockProvisioner), nil }
	return &ComponentFinder{
		Builder:       builderFactory,
		PostProcessor: ppFactory,
		Provisioner:   provFactory,
	}
}

func testEnvironment() Environment {
	config := DefaultEnvironmentConfig()
	config.Ui = &BasicUi{
		Reader:      new(bytes.Buffer),
		Writer:      new(bytes.Buffer),
		ErrorWriter: new(bytes.Buffer),
	}

	env, err := NewEnvironment(config)
	if err != nil {
		panic(err)
	}

	return env
}

func TestEnvironment_DefaultConfig_Commands(t *testing.T) {
	config := DefaultEnvironmentConfig()
	if len(config.Commands) != 0 {
		t.Fatalf("bad: %#v", config.Commands)
	}
}

func TestEnvironment_DefaultConfig_Ui(t *testing.T) {
	config := DefaultEnvironmentConfig()
	if config.Ui == nil {
		t.Fatal("config.Ui should not be nil")
	}

	rwUi, ok := config.Ui.(*BasicUi)
	if !ok {
		t.Fatal("default UI should be BasicUi")
	}
	if rwUi.Writer != os.Stdout {
		t.Fatal("default UI should go to stdout")
	}
	if rwUi.Reader != os.Stdin {
		t.Fatal("default UI reader should go to stdin")
	}
}

func TestNewEnvironment_NoConfig(t *testing.T) {
	env, err := NewEnvironment(nil)
	if env != nil {
		t.Fatal("env should be nil")
	}
	if err == nil {
		t.Fatal("should have error")
	}
}

func TestEnvironment_NilComponents(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components = *new(ComponentFinder)

	env, err := NewEnvironment(config)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// All of these should not cause panics... so we don't assert
	// anything but if there is a panic in the test then yeah, something
	// went wrong.
	env.Builder("foo")
	env.Cli([]string{"foo"})
	env.Hook("foo")
	env.PostProcessor("foo")
	env.Provisioner("foo")
}

func TestEnvironment_Builder(t *testing.T) {
	builder := &MockBuilder{}
	builders := make(map[string]Builder)
	builders["foo"] = builder

	config := DefaultEnvironmentConfig()
	config.Components.Builder = func(n string) (Builder, error) { return builders[n], nil }

	env, _ := NewEnvironment(config)
	returnedBuilder, err := env.Builder("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if returnedBuilder != builder {
		t.Fatalf("bad: %#v", returnedBuilder)
	}
}

func TestEnvironment_Builder_NilError(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Builder = func(n string) (Builder, error) { return nil, nil }

	env, _ := NewEnvironment(config)
	returnedBuilder, err := env.Builder("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if returnedBuilder != nil {
		t.Fatalf("bad: %#v", returnedBuilder)
	}
}

func TestEnvironment_Builder_Error(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Builder = func(n string) (Builder, error) { return nil, errors.New("foo") }

	env, _ := NewEnvironment(config)
	returnedBuilder, err := env.Builder("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if err.Error() != "foo" {
		t.Fatalf("bad err: %s", err)
	}
	if returnedBuilder != nil {
		t.Fatalf("should be nil: %#v", returnedBuilder)
	}
}

func TestEnvironment_Cache(t *testing.T) {
	config := DefaultEnvironmentConfig()
	env, _ := NewEnvironment(config)
	if env.Cache() == nil {
		t.Fatal("cache should not be nil")
	}
}

func TestEnvironment_Cli_Error(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Command = func(n string) (Command, error) { return nil, errors.New("foo") }

	env, _ := NewEnvironment(config)
	_, err := env.Cli([]string{"foo"})
	if err == nil {
		t.Fatal("should have error")
	}
	if err.Error() != "foo" {
		t.Fatalf("bad: %s", err)
	}
}

func TestEnvironment_Cli_CallsRun(t *testing.T) {
	command := &TestCommand{}
	commands := make(map[string]Command)
	commands["foo"] = command

	config := &EnvironmentConfig{}
	config.Commands = []string{"foo"}
	config.Components.Command = func(n string) (Command, error) { return commands[n], nil }

	env, _ := NewEnvironment(config)
	exitCode, err := env.Cli([]string{"foo", "bar", "baz"})
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if exitCode != 0 {
		t.Fatalf("bad: %d", exitCode)
	}
	if !command.runCalled {
		t.Fatal("command should be run")
	}
	if command.runEnv != env {
		t.Fatalf("bad env: %#v", command.runEnv)
	}
	if !reflect.DeepEqual(command.runArgs, []string{"bar", "baz"}) {
		t.Fatalf("bad: %#v", command.runArgs)
	}
}

func TestEnvironment_DefaultCli_Empty(t *testing.T) {
	defaultEnv := testEnvironment()

	// Test with no args
	exitCode, _ := defaultEnv.Cli([]string{})
	if exitCode != 1 {
		t.Fatalf("bad: %d", exitCode)
	}

	// Test with only blank args
	exitCode, _ = defaultEnv.Cli([]string{""})
	if exitCode != 1 {
		t.Fatalf("bad: %d", exitCode)
	}
}

func TestEnvironment_DefaultCli_Help(t *testing.T) {
	defaultEnv := testEnvironment()

	// A little lambda to help us test the output actually contains help
	testOutput := func() {
		buffer := defaultEnv.Ui().(*BasicUi).Writer.(*bytes.Buffer)
		output := buffer.String()
		buffer.Reset()
		if !strings.Contains(output, "usage: packer") {
			t.Fatalf("should contain help: %#v", output)
		}
	}

	// Test "--help"
	exitCode, _ := defaultEnv.Cli([]string{"--help"})
	if exitCode != 1 {
		t.Fatalf("bad: %d", exitCode)
	}
	testOutput()

	// Test "-h"
	exitCode, _ = defaultEnv.Cli([]string{"--help"})
	if exitCode != 1 {
		t.Fatalf("bad: %d", exitCode)
	}
	testOutput()
}

func TestEnvironment_DefaultCli_Version(t *testing.T) {
	defaultEnv := testEnvironment()

	versionCommands := []string{"version", "--version", "-v"}
	for _, command := range versionCommands {
		exitCode, _ := defaultEnv.Cli([]string{command})
		if exitCode != 0 {
			t.Fatalf("bad: %d", exitCode)
		}

		// Test the --version and -v can appear anywhere
		exitCode, _ = defaultEnv.Cli([]string{"bad", command})

		if command != "version" {
			if exitCode != 0 {
				t.Fatalf("bad: %d", exitCode)
			}
		} else {
			if exitCode != 1 {
				t.Fatalf("bad: %d", exitCode)
			}
		}
	}
}

func TestEnvironment_Hook(t *testing.T) {
	hook := &MockHook{}
	hooks := make(map[string]Hook)
	hooks["foo"] = hook

	config := DefaultEnvironmentConfig()
	config.Components.Hook = func(n string) (Hook, error) { return hooks[n], nil }

	env, _ := NewEnvironment(config)
	returned, err := env.Hook("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if returned != hook {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_Hook_NilError(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Hook = func(n string) (Hook, error) { return nil, nil }

	env, _ := NewEnvironment(config)
	returned, err := env.Hook("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_Hook_Error(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Hook = func(n string) (Hook, error) { return nil, errors.New("foo") }

	env, _ := NewEnvironment(config)
	returned, err := env.Hook("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if err.Error() != "foo" {
		t.Fatalf("err: %s", err)
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_PostProcessor(t *testing.T) {
	pp := &TestPostProcessor{}
	pps := make(map[string]PostProcessor)
	pps["foo"] = pp

	config := DefaultEnvironmentConfig()
	config.Components.PostProcessor = func(n string) (PostProcessor, error) { return pps[n], nil }

	env, _ := NewEnvironment(config)
	returned, err := env.PostProcessor("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if returned != pp {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_PostProcessor_NilError(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.PostProcessor = func(n string) (PostProcessor, error) { return nil, nil }

	env, _ := NewEnvironment(config)
	returned, err := env.PostProcessor("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_PostProcessor_Error(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.PostProcessor = func(n string) (PostProcessor, error) { return nil, errors.New("foo") }

	env, _ := NewEnvironment(config)
	returned, err := env.PostProcessor("foo")
	if err == nil {
		t.Fatal("should be an error")
	}
	if err.Error() != "foo" {
		t.Fatalf("bad err: %s", err)
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironmentProvisioner(t *testing.T) {
	p := &MockProvisioner{}
	ps := make(map[string]Provisioner)
	ps["foo"] = p

	config := DefaultEnvironmentConfig()
	config.Components.Provisioner = func(n string) (Provisioner, error) { return ps[n], nil }

	env, _ := NewEnvironment(config)
	returned, err := env.Provisioner("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if returned != p {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironmentProvisioner_NilError(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Provisioner = func(n string) (Provisioner, error) { return nil, nil }

	env, _ := NewEnvironment(config)
	returned, err := env.Provisioner("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironmentProvisioner_Error(t *testing.T) {
	config := DefaultEnvironmentConfig()
	config.Components.Provisioner = func(n string) (Provisioner, error) {
		return nil, errors.New("foo")
	}

	env, _ := NewEnvironment(config)
	returned, err := env.Provisioner("foo")
	if err == nil {
		t.Fatal("should have error")
	}
	if err.Error() != "foo" {
		t.Fatalf("err: %s", err)
	}
	if returned != nil {
		t.Fatalf("bad: %#v", returned)
	}
}

func TestEnvironment_SettingUi(t *testing.T) {
	ui := &BasicUi{
		Reader: new(bytes.Buffer),
		Writer: new(bytes.Buffer),
	}

	config := &EnvironmentConfig{}
	config.Ui = ui

	env, _ := NewEnvironment(config)

	if env.Ui() != ui {
		t.Fatalf("UI should be equal: %#v", env.Ui())
	}
}