package smartconfig

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

func TestCLIInterpolation(t *testing.T) {
	// Set up environment variables
	_ = os.Setenv("TEST_APP_NAME", "myapp")
	_ = os.Setenv("TEST_PORT", "8080")
	defer func() {
		_ = os.Unsetenv("TEST_APP_NAME")
		_ = os.Unsetenv("TEST_PORT")
	}()

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

	// Create config from reader
	reader := strings.NewReader(yamlContent)
	config, err := NewFromReader(reader)
	if err != nil {
		t.Fatalf("Failed to create config: %v", err)
	}

	// Check if interpolation worked
	name, err := config.GetString("name")
	if err != nil {
		t.Fatalf("Failed to get name: %v", err)
	}
	if name != "myapp" {
		t.Errorf("Expected name 'myapp', got '%s'", name)
	}

	port, err := config.GetString("port")
	if err != nil {
		t.Fatalf("Failed to get port: %v", err)
	}
	if port != "8080" {
		t.Errorf("Expected port '8080', got '%s'", port)
	}
}