package server

import (
	"net/http"
	"strconv"
	"strings"
	"time"
	"velvettear/godyn/config"
	"velvettear/godyn/log"
)

// exported function(s)
func Run() {
	log.Debug("starting godyn in server mode")
	serverAddress := config.ServerListen() + ":" + strconv.Itoa(config.ServerPort())
	http.HandleFunc("/", handleRequests)
	log.Info("starting server '" + serverAddress + "'...")
	err := http.ListenAndServe(serverAddress, nil)
	if err != nil {
		log.Fatal("encountered an error starting the server", err.Error())
	}
}

// unexported function(s)
func handleRequests(writer http.ResponseWriter, request *http.Request) {
	timestamp := time.Now()
	ip := strings.TrimSpace(request.Header.Get("X-Real-Ip"))
	if len(ip) == 0 {
		if strings.HasPrefix(request.RemoteAddr, "[::") {
			writer.WriteHeader(500)
			writer.Write([]byte("error: could not process request\n"))
			log.WarningTimed("could not answert request from '"+request.RemoteAddr+"'", timestamp.UnixMilli())
			return
		}
		ip, _, _ = strings.Cut(request.RemoteAddr, ":")
	}
	writer.WriteHeader(200)
	writer.Write([]byte(ip + "\n"))
	log.InfoTimed("answered request from '"+ip+"'", timestamp.UnixMilli())
}