package inbound

import (
	cmpp "github.com/bigwhite/gocmpp"
	"io"
	"log"
	"net/http"
	"time"
)

const defaultHTTPTimeout = 10 * time.Second

type Server struct {
	Addr                 string
	APIBaseURL           string
	SecurityEventToken   string
	HTTPClient           *http.Client
	SubmitHTTPClient     *http.Client
	LogWriter            io.Writer
	PendingFlushInterval time.Duration
	PresenceStore        PresenceStore
	RecoveryStore        RecoveryStore
	GatewayInstanceID    string
	MaxSubmitConcurrency int
}

func (s Server) ListenAndServe() error {
	addr := s.Addr
	if addr == "" {
		addr = ":17890"
	}
	s.logRecoveryCandidates(log.Default())
	go s.recoverPendingCandidates(log.Default())
	go s.runPendingFlusher(log.Default())
	return cmpp.ListenAndServeWithCloseAndSubmitWindow(addr, cmpp.V30, 30*time.Second, 3, s.LogWriter, s.handleConnectionClosed, submitWindowByConn,
		cmpp.HandlerFunc(s.handleLogin),
		cmpp.HandlerFunc(s.handleSubmit),
		cmpp.HandlerFunc(s.handleActivity),
	)
}

func boundedSubmitWindow(applicationWindow int, gatewayMaximum int) int {
	if applicationWindow < 1 {
		applicationWindow = 1
	}
	if gatewayMaximum < 1 {
		gatewayMaximum = 64
	}
	return min(applicationWindow, min(gatewayMaximum, 1024))
}