package config

import (
	"os"
	"strings"
)

type Config struct {
	HTTPAddr        string
	DBDSN           string
	StoreBackend    string
	RunMigrations   bool
	SNMPEnabled     bool
	SNMPCommunity   string
	ResetDBSecret   string // NETTOPO_RESET_DB_SECRET — секрет для POST /api/admin/purge-scans
}

func FromEnv() Config {
	addr := os.Getenv("HTTP_ADDR")
	if addr == "" {
		addr = ":8080"
	}

	dbDSN := os.Getenv("DB_DSN")
	storeBackend := os.Getenv("STORE_BACKEND")
	if storeBackend == "" {
		if dbDSN != "" {
			storeBackend = "postgres"
		} else {
			storeBackend = "memory"
		}
	}

	runMigrations := true
	if os.Getenv("RUN_MIGRATIONS") == "false" {
		runMigrations = false
	}
	snmpEnabled := true
	if os.Getenv("SNMP_ENABLED") == "false" {
		snmpEnabled = false
	}
	snmpCommunity := os.Getenv("SNMP_COMMUNITY")
	if snmpCommunity == "" {
		snmpCommunity = "public"
	}

	return Config{
		HTTPAddr:      addr,
		DBDSN:         dbDSN,
		StoreBackend:  storeBackend,
		RunMigrations: runMigrations,
		SNMPEnabled:   snmpEnabled,
		SNMPCommunity: snmpCommunity,
		ResetDBSecret: strings.TrimSpace(os.Getenv("NETTOPO_RESET_DB_SECRET")),
	}
}