package smartconfig

import (
	"os"
	"strings"
	"testing"
)

func TestCLIMissingEnvInterpolation(t *testing.T) {
	// Don't set TEST_APP_NAME - it should cause an error
	// Set TEST_PORT to verify partial interpolation works
	_ = os.Setenv("TEST_PORT", "3000")
	defer func() {
		_ = os.Unsetenv("TEST_PORT")
	}()

	// Test YAML content with missing env var
	yamlContent := `name: ${ENV:TEST_APP_NAME}
port: ${ENV:TEST_PORT}
host: localhost`

	// Create config from reader - should fail due to missing TEST_APP_NAME
	reader := strings.NewReader(yamlContent)
	_, err := NewFromReader(reader)
	if err == nil {
		t.Fatal("Expected error when environment variable is missing, but got none")
	}
	if !strings.Contains(err.Error(), "TEST_APP_NAME") {
		t.Errorf("Expected error to mention missing TEST_APP_NAME, got: %v", err)
	}
}