package config

import (
	"os"
)

type Config struct {
	Env            string
	Port           string
	DBName         string
	DBUser         string
	DBPassword     string
	DBPort         string
	DBHost         string
	RedisHost      string
	RedisPort      string
	RedisUser      string
	RedisPassword  string
	JWTSecret      string
	NatsURL        string
	NatsUser       string
	NatsPassword   string
	AILayerBaseURL string // AI decision-engine service base URL (e.g. http://rider-api:8082)

	// RouteOptimizerURL is the Route Optimization API that orders a rider's
	// stops (Valhalla-backed road sequencing). Empty disables sequencing: stops
	// stay unordered rather than assignment failing.
	RouteOptimizerURL string

	// TrustedProxies is a comma-separated list of reverse-proxy IPs/CIDRs that
	// are allowed to set X-Forwarded-For. Rate limiting keys on the client IP,
	// so behind a proxy this MUST be set — otherwise every request appears to
	// come from the proxy and the whole fleet shares one limit bucket.
	// Empty means "no proxy": the socket peer address is used as-is.
	TrustedProxies string
	SMTPHost       string
	SMTPPort       string
	SMTPUser       string
	SMTPPassword   string
	SMTPFrom       string
}

func Load() *Config {
	return &Config{
		Env:            getEnv("ENV", "development"),
		Port:           getEnv("APP_PORT", "8081"),
		DBName:         getEnv("DB_NAME", "logistics"),
		DBUser:         getEnv("DB_USER", "admin"),
		DBPassword:     getEnv("DB_PASSWORD", "Package@321#"),
		DBPort:         getEnv("DB_PORT", "5433"),
		DBHost:         getEnv("DB_HOST", "127.0.0.1"),
		RedisHost:      getEnv("REDIS_HOST", "127.0.0.1"),
		RedisPort:      getEnv("REDIS_PORT", "6379"),
		RedisUser:      getEnv("REDIS_USER", ""),
		RedisPassword:  getEnv("REDIS_PASSWORD", ""),
		JWTSecret:      getEnv("JWT_SECRET_KEY", "DoormileSuperSecretJWTKey2026!"),
		NatsURL:        getEnv("NATS_URL", "nats://66.116.226.161:4223"),
		NatsUser:       getEnv("NATS_USER", "doormile"),
		NatsPassword:   getEnv("NATS_PASSWORD", "Package@321#"),
		AILayerBaseURL: getEnv("AI_LAYER_BASE_URL", "https://routemate.workolik.com"),

		RouteOptimizerURL: getEnv("ROUTE_OPTIMIZER_URL", "https://routes.workolik.com"),
		TrustedProxies:    getEnv("TRUSTED_PROXIES", ""),
		SMTPHost:          getEnv("SMTP_HOST", ""),
		SMTPPort:          getEnv("SMTP_PORT", "465"),
		SMTPUser:          getEnv("SMTP_USER", ""),
		SMTPPassword:      getEnv("SMTP_PASSWORD", ""),
		SMTPFrom:          getEnv("SMTP_FROM", ""),
	}
}

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