package command

import (
	"flag"
	"os"
	"reflect"
	"sort"
	"testing"

	"github.com/creack/pty"
	"github.com/hashicorp/nomad/ci"
	"github.com/mitchellh/cli"
	"github.com/stretchr/testify/require"
)

func TestMeta_FlagSet(t *testing.T) {
	ci.Parallel(t)
	cases := []struct {
		Flags    FlagSetFlags
		Expected []string
	}{
		{
			FlagSetNone,
			[]string{},
		},
		{
			FlagSetClient,
			[]string{
				"address",
				"no-color",
				"force-color",
				"region",
				"namespace",
				"ca-cert",
				"ca-path",
				"client-cert",
				"client-key",
				"insecure",
				"tls-server-name",
				"tls-skip-verify",
				"token",
			},
		},
	}

	for i, tc := range cases {
		var m Meta
		fs := m.FlagSet("foo", tc.Flags)

		actual := make([]string, 0, 0)
		fs.VisitAll(func(f *flag.Flag) {
			actual = append(actual, f.Name)
		})
		sort.Strings(actual)
		sort.Strings(tc.Expected)

		if !reflect.DeepEqual(actual, tc.Expected) {
			t.Fatalf("%d: flags: %#v\n\nExpected: %#v\nGot: %#v",
				i, tc.Flags, tc.Expected, actual)
		}
	}
}

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

	type testCaseSetupFn func(*testing.T, *Meta)

	cases := []struct {
		Name        string
		SetupFn     testCaseSetupFn
		ExpectColor bool
	}{
		{
			Name:        "disable colors if UI is not colored",
			ExpectColor: false,
		},
		{
			Name: "colors if UI is colored",
			SetupFn: func(t *testing.T, m *Meta) {
				m.Ui = &cli.ColoredUi{}
			},
			ExpectColor: true,
		},
		{
			Name: "disable colors via CLI flag",
			SetupFn: func(t *testing.T, m *Meta) {
				m.SetupUi([]string{"-no-color"})
			},
			ExpectColor: false,
		},
		{
			Name: "disable colors via env var",
			SetupFn: func(t *testing.T, m *Meta) {
				setEnv(t, EnvNomadCLINoColor, "1")
				m.SetupUi([]string{})
			},
			ExpectColor: false,
		},
		{
			Name: "force colors via CLI flag",
			SetupFn: func(t *testing.T, m *Meta) {
				m.SetupUi([]string{"-force-color"})
			},
			ExpectColor: true,
		},
		{
			Name: "force colors via env var",
			SetupFn: func(t *testing.T, m *Meta) {
				setEnv(t, EnvNomadCLIForceColor, "1")
				m.SetupUi([]string{})
			},
			ExpectColor: true,
		},
		{
			Name: "no color take predecence over force color via CLI flag",
			SetupFn: func(t *testing.T, m *Meta) {
				m.SetupUi([]string{"-no-color", "-force-color"})
			},
			ExpectColor: false,
		},
		{
			Name: "no color take predecence over force color via env var",
			SetupFn: func(t *testing.T, m *Meta) {
				setEnv(t, EnvNomadCLINoColor, "1")
				m.SetupUi([]string{"-force-color"})
			},
			ExpectColor: false,
		},
	}

	for _, tc := range cases {
		t.Run(tc.Name, func(t *testing.T) {
			// Create fake test terminal.
			_, tty, err := pty.Open()
			require.NoError(t, err)
			defer tty.Close()

			oldStdout := os.Stdout
			defer func() { os.Stdout = oldStdout }()
			os.Stdout = tty

			// Make sure color related environment variables are clean.
			setEnv(t, EnvNomadCLIForceColor, "")
			setEnv(t, EnvNomadCLINoColor, "")

			// Run test case.
			m := &Meta{}
			if tc.SetupFn != nil {
				tc.SetupFn(t, m)
			}

			require.Equal(t, !tc.ExpectColor, m.Colorize().Disable)
		})
	}
}