package cmdutil

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/ahmetb/kubectx/internal/kubeconfig"
	"github.com/ahmetb/kubectx/internal/testutil"
)

func Test_homeDir(t *testing.T) {
	type env struct{ k, v string }
	cases := []struct {
		name string
		envs []env
		want string
	}{
		{
			name: "XDG_CACHE_HOME precedence",
			envs: []env{
				{"XDG_CACHE_HOME", "xdg"},
				{"HOME", "home"},
			},
			want: "xdg",
		},
		{
			name: "HOME over USERPROFILE",
			envs: []env{
				{"HOME", "home"},
				{"USERPROFILE", "up"},
			},
			want: "home",
		},
		{
			name: "only USERPROFILE available",
			envs: []env{
				{"XDG_CACHE_HOME", ""},
				{"HOME", ""},
				{"USERPROFILE", "up"},
			},
			want: "up",
		},
		{
			name: "none available",
			envs: []env{
				{"XDG_CACHE_HOME", ""},
				{"HOME", ""},
				{"USERPROFILE", ""},
			},
			want: "",
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(tt *testing.T) {
			var unsets []func()
			for _, e := range c.envs {
				unsets = append(unsets, testutil.WithEnvVar(e.k, e.v))
			}

			got := HomeDir()
			if got != c.want {
				t.Errorf("expected:%q got:%q", c.want, got)
			}
			for _, u := range unsets {
				u()
			}
		})
	}
}

func Test_kubeconfigPath(t *testing.T) {
	defer testutil.WithEnvVar("HOME", "/x/y/z")()

	expected := filepath.FromSlash("/x/y/z/.kube/config")
	got, err := kubeconfigPath()
	if err != nil {
		t.Fatal(err)
	}
	if got != expected {
		t.Fatalf("got=%q expected=%q", got, expected)
	}
}

func Test_kubeconfigPath_noEnvVars(t *testing.T) {
	defer testutil.WithEnvVar("XDG_CACHE_HOME", "")()
	defer testutil.WithEnvVar("HOME", "")()
	defer testutil.WithEnvVar("USERPROFILE", "")()

	_, err := kubeconfigPath()
	if err == nil {
		t.Fatalf("expected error")
	}
}

func Test_kubeconfigPath_envOvveride(t *testing.T) {
	defer testutil.WithEnvVar("KUBECONFIG", "foo")()

	v, err := kubeconfigPath()
	if err != nil {
		t.Fatal(err)
	}
	if expected := "foo"; v != expected {
		t.Fatalf("expected=%q, got=%q", expected, v)
	}
}

func Test_kubeconfigPath_envOvverideDoesNotSupportPathSeparator(t *testing.T) {
	path := strings.Join([]string{"file1", "file2"}, string(os.PathListSeparator))
	defer testutil.WithEnvVar("KUBECONFIG", path)()

	_, err := kubeconfigPath()
	if err == nil {
		t.Fatal("expected error")
	}
}

func TestStandardKubeconfigLoader_returnsNotFoundErr(t *testing.T) {
	defer testutil.WithEnvVar("KUBECONFIG", "foo")()
	kc := new(kubeconfig.Kubeconfig).WithLoader(DefaultLoader)
	err := kc.Parse()
	if err == nil {
		t.Fatal("expected err")
	}
	if !IsNotFoundErr(err) {
		t.Fatalf("expected ENOENT error; got=%v", err)
	}
}