package config

import (
	"os"
	"strconv"
	"time"
)

type Config struct {
	Addr            string
	BadgerDir       string
	PageSize        int
	ShutdownTimeout time.Duration
}

func Load() Config {
	return Config{
		Addr:            envOrDefault("APP_ADDR", ":8080"),
		BadgerDir:       envOrDefault("BADGER_DIR", "data/badger"),
		PageSize:        envIntOrDefault("PAGE_SIZE", 50),
		ShutdownTimeout: envDurationOrDefault("SHUTDOWN_TIMEOUT", 10*time.Second),
	}
}

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

	return fallback
}

func envIntOrDefault(key string, fallback int) int {
	value := os.Getenv(key)
	if value == "" {
		return fallback
	}

	parsed, err := strconv.Atoi(value)
	if err != nil || parsed <= 0 {
		return fallback
	}

	return parsed
}

func envDurationOrDefault(key string, fallback time.Duration) time.Duration {
	value := os.Getenv(key)
	if value == "" {
		return fallback
	}

	parsed, err := time.ParseDuration(value)
	if err != nil || parsed <= 0 {
		return fallback
	}

	return parsed
}