package config

import (
	"fmt"
	"os"
)

type Config struct {
	Env            string // dev | stage | prod
	Addr           string // listen address, e.g. ":8080"
	KeycloakIssuer string // e.g. http://localhost:8080/realms/breakpilot-dev
	DatabaseURL    string // postgres DSN (unused in skeleton; in-memory store)
}

func Load() (*Config, error) {
	env := getenv("APP_ENV", "dev")
	if env != "dev" && env != "stage" && env != "prod" {
		return nil, fmt.Errorf("invalid APP_ENV %q", env)
	}
	return &Config{
		Env:            env,
		Addr:           getenv("ADDR", ":8080"),
		KeycloakIssuer: getenv("KEYCLOAK_ISSUER", "http://localhost:8080/realms/breakpilot-dev"),
		DatabaseURL:    os.Getenv("DATABASE_URL"),
	}, nil
}

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