package theme

import (
	"os/exec"
	"runtime"
	"strings"
)

// Detect returns "flexoki-dark" or "flexoki-light" from the OS appearance. On
// non-darwin platforms it returns dark. On macOS it reads the global
// AppleInterfaceStyle key (unset in Light mode → empty output → light).
func Detect() string {
	if runtime.GOOS != "darwin" {
		return "flexoki-dark"
	}
	out, _ := exec.Command("defaults", "read", "-g", "AppleInterfaceStyle").Output()
	return detectFrom(string(out))
}

// detectFrom parses the raw `defaults read -g AppleInterfaceStyle` output.
func detectFrom(raw string) string {
	if strings.Contains(raw, "Dark") {
		return "flexoki-dark"
	}
	return "flexoki-light"
}