package config

import (
	"fmt"
	"os"
	"strings"
)

// Config contains all runtime settings sourced from environment variables.
type Config struct {
	Port         string
	ServiceName  string
	Environment  string
	LogLevel     string
	OTLPEndpoint string
}

func Load() Config {
	return Config{
		Port:         getEnv("PORT", "8080"),
		ServiceName:  getEnv("SERVICE_NAME", "switchbot-api"),
		Environment:  getEnv("ENV", "local"),
		LogLevel:     getEnv("LOG_LEVEL", "info"),
		OTLPEndpoint: strings.TrimSpace(os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT")),
	}
}

func (c Config) Addr() string {
	if strings.HasPrefix(c.Port, ":") {
		return c.Port
	}
	return fmt.Sprintf(":%s", c.Port)
}

func getEnv(key, fallback string) string {
	if value, ok := os.LookupEnv(key); ok {
		trimmed := strings.TrimSpace(value)
		if trimmed != "" {
			return trimmed
		}
	}
	return fallback
}