package profile

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

// goProfile is the identity Turbo Go builds itself with, which is what makes
// the expectations below the real ones rather than invented.
func goProfile() Profile {
	return Profile{Name: "Turbo Go", Slug: "turbo-go", Language: "Go"}
}

func TestProjectDirIsTheSlugWithADotInFront(t *testing.T) {
	if got := goProfile().ProjectDir(); got != ".turbo-go" {
		t.Errorf("ProjectDir() = %q, want %q", got, ".turbo-go")
	}
}

func TestTheEnvironmentVariableNamesAreTheOnesTurboGoAlreadyUsed(t *testing.T) {
	// These three names are not free to change: a user who has set
	// TURBO_GO_THEME_DIR did so against a released binary.
	tests := []struct {
		name string
		got  string
		want string
	}{
		{"user directory", goProfile().DirEnvVar(), "TURBO_GO_DIR"},
		{"theme directory", goProfile().ThemeDirEnvVar(), "TURBO_GO_THEME_DIR"},
		{"snippet directory", goProfile().SnippetDirEnvVar(), "TURBO_GO_SNIPPET_DIR"},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			if test.got != test.want {
				t.Errorf("got %q, want %q", test.got, test.want)
			}
		})
	}
}

func TestUserDirHonoursItsEnvironmentOverride(t *testing.T) {
	dir := t.TempDir()
	t.Setenv(goProfile().DirEnvVar(), dir)

	if got := goProfile().UserDir(); got != dir {
		t.Errorf("UserDir() = %q, want %q", got, dir)
	}
}

func TestUserDirFallsBackToTheConfigDirectory(t *testing.T) {
	t.Setenv(goProfile().DirEnvVar(), "")

	got := goProfile().UserDir()
	// A system with no configuration directory at all gives "", which is a
	// state the editor handles rather than an error.
	if got != "" && filepath.Base(got) != "turbo-go" {
		t.Errorf("UserDir() = %q, want it to end in turbo-go", got)
	}
}

func TestThemeDirSitsUnderTheUserDirectory(t *testing.T) {
	dir := t.TempDir()
	t.Setenv(goProfile().DirEnvVar(), dir)
	t.Setenv(goProfile().ThemeDirEnvVar(), "")

	want := filepath.Join(dir, "themes")
	if got := goProfile().ThemeDir(); got != want {
		t.Errorf("ThemeDir() = %q, want %q", got, want)
	}
}

func TestTheThemeOverrideNamesTheThemeDirectoryItself(t *testing.T) {
	// Not the directory above it: a test setting this wants to say exactly
	// where its theme files are, without having to make a themes/ inside it.
	dir := t.TempDir()
	t.Setenv(goProfile().ThemeDirEnvVar(), dir)

	if got := goProfile().ThemeDir(); got != dir {
		t.Errorf("ThemeDir() = %q, want %q", got, dir)
	}
}

func TestThemeDirIsEmptyWhenThereIsNowhereToPutIt(t *testing.T) {
	t.Setenv(goProfile().ThemeDirEnvVar(), "")
	t.Setenv(goProfile().DirEnvVar(), "")
	// UserConfigDir reads these; emptying them is what makes it fail.
	t.Setenv("XDG_CONFIG_HOME", "")
	t.Setenv("HOME", "")
	if os.Getenv("HOME") != "" {
		t.Skip("this system does not take its configuration directory from HOME")
	}

	if got := goProfile().ThemeDir(); got != "" {
		t.Errorf("ThemeDir() = %q, want %q", got, "")
	}
}

func TestASlugWithDashesBecomesAnEnvironmentVariableWithUnderscores(t *testing.T) {
	p := Profile{Slug: "turbo-rust"}
	if got := p.ThemeDirEnvVar(); got != "TURBO_RUST_THEME_DIR" {
		t.Errorf("ThemeDirEnvVar() = %q, want %q", got, "TURBO_RUST_THEME_DIR")
	}
}