main.go

package main

import (
	"booking-app/helper"
	"fmt"
	"strings"
)

const conferenceTickets int = 50

var remainingTickets uint = 50
var conferenceName = "Go Conference"
var bookings = []string{}

func main() {

	greetUsers()

	for {

		firstName, lastName, email, userTickets := getUserInput()
		isValidName, isValidEmail, isValidTicketNumber := helper.ValidateUserInput(firstName, lastName, email, userTickets, remainingTickets)

		if isValidName && isValidEmail && isValidTicketNumber {

			bookTicket(userTickets, firstName, lastName, email)

			firstNames := printFirstNames()
			fmt.Printf("The first names %v\n", firstNames)

			if remainingTickets == 0 {
				// end program
				break
			}
		} else {
			if !isValidName {
				fmt.Println("firt name or last name you entered is too short")
			}
			if !isValidEmail {
				fmt.Println("email address you entered doesn't contain @ sign")
			}
			if !isValidTicketNumber {
				fmt.Println("number of tickets you entered is invalid")
			}
			continue
		}
	}
}

func printFirstNames() []string {
	firstNames := []string{}

	for _, booking := range bookings {
		var names = strings.Fields(booking)
		firstNames = append(firstNames, names[0])
	}
	return firstNames
}

func getUserInput() (string, string, string, uint) {
	var firstName string
	var lastName string
	var email string
	var userTickets uint

	fmt.Println("Enter Your First Name: ")
	fmt.Scanln(&firstName)

	fmt.Println("Enter Your Last Name: ")
	fmt.Scanln(&lastName)

	fmt.Println("Enter Your Email: ")
	fmt.Scanln(&email)

	fmt.Println("Enter number of tickets: ")
	fmt.Scanln(&userTickets)

	return firstName, lastName, email, userTickets
}

func greetUsers() {
	fmt.Printf("Welcome to %v booking application.\nWe have total of %v tickets and %v are still available.\nGet your tickets here to attend\n", conferenceName, conferenceTickets, remainingTickets)
}

func bookTicket(userTickets uint, firstName string, lastName string, email string) {
	remainingTickets = remainingTickets - userTickets
	bookings = append(bookings, firstName+" "+lastName)

	fmt.Printf("Thank you %v %v for booking %v tickets. You will receive a confirmation email at %v\n", firstName, lastName, userTickets, email)
	fmt.Printf("%v tickets remaining for %v\n", remainingTickets, conferenceName)
}