// Package config provides the main configuration
package config

import (
	"golang.org/x/time/rate"
	"time"
)

// Defines default config settings
const (
	DefaultListenHTTP            = ":80"
	DefaultMessageBufferDuration = 12 * time.Hour
	DefaultKeepaliveInterval     = 30 * time.Second
	DefaultManagerInterval       = time.Minute
)

// Defines the max number of requests, here:
// 50 requests bucket, replenished at a rate of 1 per second
var (
	defaultRequestLimit      = rate.Every(time.Second)
	defaultRequestLimitBurst = 50
	defaultSubscriptionLimit = 30 // per visitor
)

// Config is the main config struct for the application. Use New to instantiate a default config struct.
type Config struct {
	ListenHTTP            string
	FirebaseKeyFile       string
	MessageBufferDuration time.Duration
	KeepaliveInterval     time.Duration
	ManagerInterval       time.Duration
	RequestLimit          rate.Limit
	RequestLimitBurst     int
	SubscriptionLimit     int
}

// New instantiates a default new config
func New(listenHTTP string) *Config {
	return &Config{
		ListenHTTP:            listenHTTP,
		FirebaseKeyFile:       "",
		MessageBufferDuration: DefaultMessageBufferDuration,
		KeepaliveInterval:     DefaultKeepaliveInterval,
		ManagerInterval:       DefaultManagerInterval,
		RequestLimit:          defaultRequestLimit,
		RequestLimitBurst:     defaultRequestLimitBurst,
		SubscriptionLimit:     defaultSubscriptionLimit,
	}
}