bill.go

package main

import (
	"fmt"
	"math/rand"
	"strings"
	"time"
)

//just beautifying my code :P
func displayGeneratingBill() {
	fmt.Println()
	billDisplayText := "************************************* Generating Bill *************************************"
	for _, element := range billDisplayText {
		fmt.Printf("%c", element) // if you use "%v" instead of "%c" then convert element into string, as shown in the comment below
		// fmt.Print("%v", string(element))
		time.Sleep(time.Millisecond * 15)
	}
}

//prints item name, price, quantity and total price and sub total amount.
func generateBill() {

	fmt.Println()
	fmt.Printf("+%s+\n", strings.Repeat("-", 90))
	fmt.Printf(" %-30s %-20s %-20s %-20s\n", "Item Name", "Price(₹)", "Quantity", "Total Price(₹)")
	fmt.Printf("+%s+\n", strings.Repeat("-", 90))

	//prints the details of the food item that you've ordered.
	printOrderData()

	fmt.Printf("+%s+\n", strings.Repeat("-", 90))

	//print sub total amount in a cool way!
	fmt.Printf("%47s", " ")
	for _, element := range "Sub Total(excluding GST): ₹" {
		fmt.Printf("%c", element)
		time.Sleep(time.Millisecond * 50)
	}
	fmt.Printf("%.2f\n", subTotalBill)

}

//prints the data of the items that you ordered.
func printOrderData() {
	for key := range customerOrder {
		//key -> it is the key values
		for _, element := range menu {
			if key == element.itemName {
				//customerOrder[key] -> will provide the no. of plates of that item
				//float64(customerOrder[key])*element.itemPrice -> this will result in the cost of each item
				totalCostOfItem := float64(customerOrder[key]) * element.itemPrice
				fmt.Printf(" %-30s %-20.2f %-20v %-20.2f\n", key, element.itemPrice, customerOrder[key], totalCostOfItem)
			}
		}
	}
	fmt.Println()
}

func printFinalBill() {
	for _, element := range "Here is your final bill:-" {
		fmt.Printf("%c", element)
		time.Sleep(time.Millisecond * 50)
	}
	fmt.Println()

	fmt.Printf("\n%52s\n", "JAIPUR BHOJANALYA")
	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%s\n", strings.Repeat("*", 91))
	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%86s\n", "Bhawani Singh Road, First Floor, Jaipur Bhojanalya, Jaipur, Jaipur 302005, Bharat")
	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%50s\n", "Tel: 92145623XX")
	fmt.Printf("%60s\n\n", "Email: jaipur.bhojanalaya@gmail.com")
	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%s", strings.Repeat("-", 42))
	fmt.Printf("%s", "INVOICE")
	fmt.Printf("%s\n", strings.Repeat("-", 42))
	time.Sleep(time.Millisecond * 200)

	rand.Seed(time.Now().Unix()) //necessary to produce random integers
	fmt.Printf(" Ticket No: %d\n", rand.Intn(550)+1)

	fmt.Printf(" Date: %v\n", time.Now().Local().Format("06-Jan-02")) //display date
	fmt.Printf(" Time: %v", time.Now().Local().Format("3:4 PM"))      //display time
	time.Sleep(time.Millisecond * 200)

	generateBill() //prints details of the bill,like, item name, price, quantity and total price and sub total amount.

	tax := 18 * subTotalBill / (100)
	grandTotal := subTotalBill + tax

	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%71s: ₹%.2f\n", "GST", tax) //display tax amount
	fmt.Printf("+%s+\n", strings.Repeat("-", 90))
	time.Sleep(time.Millisecond * 200)
	fmt.Printf("%71s: ₹%.2f\n", "Grand Total", grandTotal) //display final bill
	fmt.Printf("+%s+\n", strings.Repeat("-", 90))

}