package config

import (
	"fmt"
	"os"

	"github.com/joho/godotenv"
)

// Config holds all configuration values
type Config struct {
	// Exoscale
	ExoscaleAPIKey    string
	ExoscaleAPISecret string

	// Cloudscale
	CloudscaleAPIToken string

	// Hetzner Cloud
	HetznerAPIKey string

	// Hetzner Storage Box (for backups)
	HetznerStorageBoxUser string
	HetznerStorageBoxHost string

	// Local backup path
	LocalBackupPath string
}

var cfg *Config

// Load reads configuration from .env file
func Load(envFile string) error {
	if envFile != "" {
		if err := godotenv.Load(envFile); err != nil {
			// Not fatal - env vars might be set directly
			fmt.Fprintf(os.Stderr, "Warning: could not load %s: %v\n", envFile, err)
		}
	}

	cfg = &Config{
		ExoscaleAPIKey:        os.Getenv("EXOSCALE_API_KEY"),
		ExoscaleAPISecret:     os.Getenv("EXOSCALE_API_SECRET"),
		CloudscaleAPIToken:    os.Getenv("CLOUDSCALE_API_TOKEN"),
		HetznerAPIKey:         os.Getenv("HETZNER_API_KEY"),
		HetznerStorageBoxUser: getEnvDefault("HETZNER_STORAGEBOX_USER", "u480813"),
		HetznerStorageBoxHost: getEnvDefault("HETZNER_STORAGEBOX_HOST", "u480813.your-storagebox.de"),
		LocalBackupPath:       getEnvDefault("LOCAL_BACKUP_PATH", "/srv/backups"),
	}

	return nil
}

// Get returns the current configuration
func Get() *Config {
	if cfg == nil {
		cfg = &Config{}
	}
	return cfg
}

// Validate checks required credentials for a provider
func (c *Config) ValidateProvider(provider string) error {
	switch provider {
	case "exoscale":
		if c.ExoscaleAPIKey == "" || c.ExoscaleAPISecret == "" {
			return fmt.Errorf("EXOSCALE_API_KEY and EXOSCALE_API_SECRET required")
		}
	case "cloudscale":
		if c.CloudscaleAPIToken == "" {
			return fmt.Errorf("CLOUDSCALE_API_TOKEN required")
		}
	case "hetzner":
		if c.HetznerAPIKey == "" {
			return fmt.Errorf("HETZNER_API_KEY required")
		}
	default:
		return fmt.Errorf("unknown provider: %s", provider)
	}
	return nil
}

func getEnvDefault(key, defaultVal string) string {
	if val := os.Getenv(key); val != "" {
		return val
	}
	return defaultVal
}