[UNFINISHED] Chat server for backend workshop

chatserver.go

package main

import (
	"net/http"
	"strings"
)

func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8000", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
	path := strings.Split(r.URL.Path, "/")
	if len(path) < 3 {
		w.WriteHeader(500)
		return
	}

	username1 := path[1]
	username2 := path[2]

	if r.Method == "POST" {
		// handle sending messages
		return
	}

	if r.Method == "GET" {
		// handle reading messages
		messages := getMessages(username1, username2)
		splitMessageString := "messages:\n" + strings.Join(messages, "\n")

		w.WriteHeader(200)
		w.Write([]byte(splitMessageString))
		return
	}

	w.Write([]byte("Route not found"))
	w.WriteHeader(404)
	return
}

// user1 -> user2 -> shared map between user 1, user 2

type user struct {
	name          string // name of the object
	conversations map[string]*[]string
}

var users = make(map[string]*user)

func createUser(username string) *user {
	conversations := make(map[string]*[]string)

	newUser := user{
		name:          username,
		conversations: conversations,
	}

	users[username] = &newUser

	return &newUser
}

func sendMessage(username1 string, username2 string, message string) {
	user1, exists := users[username1]
	if !exists {
		user1 = createUser(username1)
	}

	user2, exists := users[username2]
	if !exists {
		user2 = createUser(username2)
	}

	userAndMessage := username1 + ": " + message

	messages := user1.conversations[username2]
	if messages == nil {
		messages = &[]string{userAndMessage}
		user1.conversations[username2] = messages
		user2.conversations[username1] = messages
	} else {
		*messages = append(*messages, userAndMessage)
	}
}

func getMessages(username1 string, username2 string) []string {
	if (users[username1] == nil) {
		return []string{}
	}

	
	
	messages := users[username1].conversations[username2]
	return *messages
}