package common

import (
	"fmt"
	"github.com/mitchellh/mapstructure"
	"io/ioutil"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strings"
	"testing"
)

func TestCheckUnusedConfig(t *testing.T) {
	md := &mapstructure.Metadata{
		Unused: make([]string, 0),
	}

	err := CheckUnusedConfig(md)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	md.Unused = []string{"foo", "bar"}
	err = CheckUnusedConfig(md)
	if err == nil {
		t.Fatal("should have error")
	}
}

func TestChooseString(t *testing.T) {
	cases := []struct {
		Input  []string
		Output string
	}{
		{
			[]string{"", "foo", ""},
			"foo",
		},
		{
			[]string{"", "foo", "bar"},
			"foo",
		},
		{
			[]string{"", "", ""},
			"",
		},
	}

	for _, tc := range cases {
		result := ChooseString(tc.Input...)
		if result != tc.Output {
			t.Fatalf("bad: %#v", tc.Input)
		}
	}
}

func TestDecodeConfig(t *testing.T) {
	type Local struct {
		Foo string
		Bar string
	}

	raws := []interface{}{
		map[string]interface{}{
			"foo": "bar",
		},
		map[string]interface{}{
			"bar": "baz",
			"baz": "what",
		},
	}

	var result Local
	md, err := DecodeConfig(&result, raws...)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if result.Foo != "bar" {
		t.Fatalf("invalid: %#v", result.Foo)
	}

	if result.Bar != "baz" {
		t.Fatalf("invalid: %#v", result.Bar)
	}

	if md == nil {
		t.Fatal("metadata should not be nil")
	}

	if !reflect.DeepEqual(md.Unused, []string{"baz"}) {
		t.Fatalf("unused: %#v", md.Unused)
	}
}

// This test tests the case that a user var is used for an integer
// configuration.
func TestDecodeConfig_stringToSlice(t *testing.T) {
	type Local struct {
		Val []string
	}

	raw := map[string]interface{}{
		"packer_user_variables": map[string]string{
			"foo": "bar",
		},

		"val": "foo,{{user `foo`}}",
	}

	var result Local
	_, err := DecodeConfig(&result, raw)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	expected := []string{"foo", "bar"}
	if !reflect.DeepEqual(result.Val, expected) {
		t.Fatalf("invalid: %#v", result.Val)
	}
}

// This test tests the case that a user var is used for an integer
// configuration.
func TestDecodeConfig_userVarConversion(t *testing.T) {
	type Local struct {
		Val int
	}

	raw := map[string]interface{}{
		"packer_user_variables": map[string]string{
			"foo": "42",
		},

		"val": "{{user `foo`}}",
	}

	var result Local
	_, err := DecodeConfig(&result, raw)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if result.Val != 42 {
		t.Fatalf("invalid: %#v", result.Val)
	}
}

// This tests the way MessagePack decodes strings (into []uint8) and
// that we can still decode into the proper types.
func TestDecodeConfig_userVarConversionUInt8(t *testing.T) {
	type Local struct {
		Val int
	}

	raw := map[string]interface{}{
		"packer_user_variables": map[string]string{
			"foo": "42",
		},

		"val": []uint8("{{user `foo`}}"),
	}

	var result Local
	_, err := DecodeConfig(&result, raw)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if result.Val != 42 {
		t.Fatalf("invalid: %#v", result.Val)
	}
}

func TestDownloadableURL(t *testing.T) {
	// Invalid URL: has hex code in host
	_, err := DownloadableURL("http://what%20.com")
	if err == nil {
		t.Fatal("expected err")
	}

	// Invalid: unsupported scheme
	_, err = DownloadableURL("ftp://host.com/path")
	if err == nil {
		t.Fatal("expected err")
	}

	// Valid: http
	u, err := DownloadableURL("HTTP://packer.io/path")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if u != "http://packer.io/path" {
		t.Fatalf("bad: %s", u)
	}

	// No path
	u, err = DownloadableURL("HTTP://packer.io")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if u != "http://packer.io" {
		t.Fatalf("bad: %s", u)
	}
}

func TestDownloadableURL_FilePaths(t *testing.T) {
	tf, err := ioutil.TempFile("", "packer")
	if err != nil {
		t.Fatalf("tempfile err: %s", err)
	}
	defer os.Remove(tf.Name())
	tf.Close()

	tfPath, err := filepath.EvalSymlinks(tf.Name())
	if err != nil {
		t.Fatalf("tempfile err: %s", err)
	}

	tfPath = filepath.Clean(tfPath)

	filePrefix := "file://"
	if runtime.GOOS == "windows" {
		filePrefix += "/"
	}

	// Relative filepath. We run this test in a func so that
	// the defers run right away.
	func() {
		wd, err := os.Getwd()
		if err != nil {
			t.Fatalf("getwd err: %s", err)
		}

		err = os.Chdir(filepath.Dir(tfPath))
		if err != nil {
			t.Fatalf("chdir err: %s", err)
		}
		defer os.Chdir(wd)

		filename := filepath.Base(tfPath)
		u, err := DownloadableURL(filename)
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		expected := fmt.Sprintf("%s%s",
			filePrefix,
			strings.Replace(tfPath, `\`, `/`, -1))
		if u != expected {
			t.Fatalf("unexpected: %#v != %#v", u, expected)
		}
	}()

	// Test some cases with and without a schema prefix
	for _, prefix := range []string{"", "file://"} {
		// Nonexistent file
		_, err = DownloadableURL(prefix + "i/dont/exist")
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		// Good file
		u, err := DownloadableURL(prefix + tfPath)
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		expected := fmt.Sprintf("%s%s",
			filePrefix,
			strings.Replace(tfPath, `\`, `/`, -1))
		if u != expected {
			t.Fatalf("unexpected: %s != %s", u, expected)
		}
	}
}

func TestScrubConfig(t *testing.T) {
	type Inner struct {
		Baz string
	}
	type Local struct {
		Foo string
		Bar string
		Inner
	}
	c := Local{"foo", "bar", Inner{"bar"}}
	expect := "Config: {Foo:foo Bar:<Filtered> Inner:{Baz:<Filtered>}}"
	conf := ScrubConfig(c, c.Bar)
	if conf != expect {
		t.Fatalf("got %s, expected %s", conf, expect)
	}
}