#78 Added Booking app using golang.

booking-app/helper.go

@@ -0,0 +1,10 @@
+package main
+
+import "strings"
+
+func validateUserInput(firstName string, lastName string, email string, userTickets uint) (bool, bool, bool) {
+	isValidName := len(firstName) >= 2 && len(lastName) >= 2
+	isValidEmail := strings.Contains(email, "@")
+	isValidTicketNumber := userTickets > 0 && userTickets <= remainingTickets
+	return isValidName, isValidEmail, isValidTicketNumber
+}

booking-app/main.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+)
+const conferenceTickets int = 50
+
+var conferenceName = "Go Conference"
+var  remainingTickets uint = 50
+var bookings = make([]UserData,0)
+
+type UserData struct {
+	firstName       string
+	lastName        string
+	email           string
+	numberOfTickets uint
+}
+
+
+func main(){
+	greetUsers()
+
+	for {
+		firstName, lastName, email, userTickets := getUserInput()
+		isValidName, isValidEmail, isValidTicketNumber := validateUserInput(firstName, lastName, email, userTickets)
+
+		if isValidName && isValidEmail && isValidTicketNumber {
+
+			bookTicket(userTickets, firstName, lastName, email)
+
+
+			go sendTicket(userTickets, firstName, lastName, email)
+
+			firstNames := getFirstNames()
+			fmt.Printf("The first names of bookings are: %v\n", firstNames)
+
+			if remainingTickets == 0 {
+				// end program
+				fmt.Println("Our conference is booked out. Come back next year.")
+				// break
+			}
+		} else {
+			if !isValidName {
+				fmt.Println("first 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")
+			}
+		}
+		}
+
+	}
+
+
+
+
+func greetUsers(){
+	fmt.Printf("Welcome to %v booking application\n", conferenceName)
+	fmt.Printf("We have total of %v tickets and %v are still available.\n", conferenceTickets, remainingTickets)
+	fmt.Printf("Get your tickets here to attend")
+}
+func getFirstNames() []string{
+	firstNames := []string{}
+	for _, booking := range bookings{
+		firstNames = append(firstNames, booking.firstName)
+	}
+	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.Scan(&firstName)
+
+	fmt.Println("Enter your last name: ")
+	fmt.Scan(&lastName)
+
+	fmt.Println("Enter your email address: ")
+	fmt.Scan(&email)
+
+	fmt.Println("Enter number of tickets: ")
+	fmt.Scan(&userTickets)
+
+	return firstName, lastName, email, userTickets
+
+
+}
+func bookTicket(userTickets uint, firstName string, lastName string, email string ){
+	remainingTickets = remainingTickets - userTickets
+	var UserData = UserData{
+		firstName:  firstName ,
+		lastName: lastName,
+		email: email,
+		numberOfTickets: userTickets,
+	}
+	bookings = append(bookings, UserData)
+	fmt.Printf("List of bookings is %v/n", bookings)
+
+	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)
+
+
+}
+func sendTicket(userTickets uint, firstName string , lastName string, email string){
+	time.Sleep(20 * time.Second)
+	var ticket = fmt.Sprintf("%v tickets for %v %v", userTickets, firstName, lastName)
+	fmt.Println("#################")
+	fmt.Printf("Sending ticket:\n %v \nto email address %v\n", ticket, email)
+	fmt.Println("#################")
+
+
+}