package config

import (
	"os"

	"github.com/joho/godotenv"
)

// Config holds all application configuration.
type Config struct {
	Port        string
	DatabaseURL string
	JWTSecret   string
	Environment string
	BasePath    string // URL path prefix (e.g. "/dev", "/test", or "" for root)

	// Admin bootstrap (optional — set via K8s secret)
	AdminUsername string
	AdminPassword string
	AdminEmail    string
}

// Load reads configuration from environment variables.
// A .env file is loaded if present but not required.
func Load() *Config {
	// Best-effort .env load (not required in production)
	_ = godotenv.Load()

	return &Config{
		Port:          getEnv("PORT", "8080"),
		DatabaseURL:   getEnv("DATABASE_URL", ""),
		JWTSecret:     getEnv("JWT_SECRET", "dev-secret-change-me"),
		Environment:   getEnv("ENVIRONMENT", "development"),
		BasePath:      sanitizeBasePath(getEnv("BASE_PATH", "")),
		AdminUsername: getEnv("SWITCHBOARD_ADMIN_USERNAME", ""),
		AdminPassword: getEnv("SWITCHBOARD_ADMIN_PASSWORD", ""),
		AdminEmail:    getEnv("SWITCHBOARD_ADMIN_EMAIL", ""),
	}
}

// sanitizeBasePath ensures the path starts with / and doesn't end with /.
// Empty string means root (no prefix).
func sanitizeBasePath(p string) string {
	if p == "" || p == "/" {
		return ""
	}
	// Ensure leading slash
	if p[0] != '/' {
		p = "/" + p
	}
	// Strip trailing slash
	for len(p) > 1 && p[len(p)-1] == '/' {
		p = p[:len(p)-1]
	}
	return p
}

func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}