package config

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

func TestLoad(t *testing.T) {
	// Create a temporary config file
	tmpDir := t.TempDir()
	configFile := filepath.Join(tmpDir, "config.yaml")
	
	yamlContent := []byte(`
logging:
  level: "info"
server:
  host: "localhost"
  port: 8080
`)
	if err := os.WriteFile(configFile, yamlContent, 0644); err != nil {
		t.Fatalf("failed to write temp config file: %v", err)
	}

	t.Run("Load from YAML", func(t *testing.T) {
		cfg, err := Load(configFile, "TEST")
		if err != nil {
			t.Fatalf("Load() error = %v", err)
		}
		if cfg.Logging.Level != "info" {
			t.Errorf("expected Logging.Level 'info', got '%s'", cfg.Logging.Level)
		}
		if cfg.Server.Host != "localhost" {
			t.Errorf("expected Server.Host 'localhost', got '%s'", cfg.Server.Host)
		}
		if cfg.Server.Port != 8080 {
			t.Errorf("expected Server.Port 8080, got %d", cfg.Server.Port)
		}
	})

	t.Run("Override from Env", func(t *testing.T) {
		os.Setenv("TEST_LOGGING_LEVEL", "debug")
		os.Setenv("TEST_SERVER_PORT", "9090")
		os.Setenv("TEST_SERVER_HOST", "0.0.0.0")
		defer func() {
			os.Unsetenv("TEST_LOGGING_LEVEL")
			os.Unsetenv("TEST_SERVER_PORT")
			os.Unsetenv("TEST_SERVER_HOST")
		}()

		cfg, err := Load(configFile, "TEST")
		if err != nil {
			t.Fatalf("Load() error = %v", err)
		}
		if cfg.Logging.Level != "debug" {
			t.Errorf("expected Logging.Level 'debug', got '%s'", cfg.Logging.Level)
		}
		if cfg.Server.Port != 9090 {
			t.Errorf("expected Server.Port 9090, got %d", cfg.Server.Port)
		}
		if cfg.Server.Host != "0.0.0.0" {
			t.Errorf("expected Server.Host '0.0.0.0', got '%s'", cfg.Server.Host)
		}
	})
}