package chapter12;

import java.util.stream.*;

import java.util.*;

import java.util.function.*;

class Item

{

String model;

int quantity;

double price;

public Item(String m, int q, double p)

{

model = m;

quantity = q;

price = p;

}

@Override

public String toString()

{

return model + ":" + quantity + " $" + price;

}

}

class Part

{

String name;

String manu;

int hoursToInstall;

List<Item> models;

public Part(String n, String m, int h, Item... it)

{

name = n;

manu = m;

hoursToInstall = h;

models = new ArrayList<>();

for (Item i : it)

models.add(i);

}

@Override

public String toString()

{

return manu + " " + hoursToInstall + "hrs " + models;

}

}

public class Inventory

{

static String partName = null;

static int quantity=0;

static double price = 0.0;

static int timeLimit = 0;

public static void main(String[] args)

{

List<Part> parts = Arrays.asList(

new Part("tires","Goodyear",2,

new Item("RX2041",4,75.25),

new Item("SX3355",2,90.50)),

new Part("brakes","EBC",1,

new Item("EX8426",2,125.35)),

new Part("tires","Firestone",1,

new Item("FS2112",3,60.47),

new Item("FS2479",5,85.20)),

new Part("brakes","Acme",3,

new Item("AC25",1,90.74),

new Item("AC26",4,130.22))

);

Supplier<Integer> selectOperation = () -> {

Scanner userInput = new Scanner(System.in);

int operation = -1;

while (operation < 0 || operation > 5)

{

System.out.println("Please select an operation:");

System.out.println(

" 0 - List inventory");

System.out.println(

" 1 - Find item by quantity and price");

System.out.println(

" 2 - List items by price");

System.out.println(

" 3 - Count items by part name");

System.out.println(

" 4 - Find items by installation time");

System.out.print (

" 5 - End program:");

operation = Integer.parseInt(userInput.nextLine());

if (operation < 0 || operation > 5)

System.out.println("Invalid operation");

}

return operation;

};

Supplier<String> selectPartName = () ->

(new Scanner(System.in)).nextLine();

Supplier<Integer> selectQuantity = () ->

Integer.parseInt((new Scanner(System.in)).nextLine());

Supplier<Double> selectPrice = () ->

Double.parseDouble((new Scanner(System.in)).nextLine());

Supplier<Integer> selectTimeLimit = () ->

Integer.parseInt((new Scanner(System.in)).nextLine());

System.out.println(

"Welcome to Discount Dave's Inventory Program.");

boolean done = false;

while (!done)

{

switch (selectOperation.get())

{

case 0:

parts.stream()

.collect(Collectors.groupingBy(x -> x.name))

.forEach(

(x,y) -> System.out.println(x + ": " + y));

break;

case 1:

System.out.print("Select a part name:");

partName = selectPartName.get();

System.out.print("Select a minimum quantity:");

quantity = selectQuantity.get();

System.out.print("Select a price limit:");

price = selectPrice.get();

parts.stream()

.filter(x -> x.name.equals(partName))

.peek(x -> System.out.println(

x.name + " by " + x.manu + ":"))

.flatMap(x -> x.models.stream())

.filter(x -> x.price <= price)

.filter(x -> x.quantity >= quantity)

.forEach(x -> System.out.println(x));

break;

case 2:

System.out.print("Select a part name:");

partName = selectPartName.get();

parts.stream()

.filter(x -> x.name.equals(partName))

.flatMap(x -> x.models.stream())

.sorted( Comparator.comparing(x -> x.price))

.forEach(x -> System.out.println(x));

break;

case 3:

System.out.print("Select a part name:");

partName = selectPartName.get();

Integer i =

parts.stream()

.filter(x -> x.name.equals(partName))

.flatMap(x -> x.models.stream())

.reduce(0,

(x,z) -> x + z.quantity,

(x,y) -> x += y);

System.out.println(i);

break;

case 4:

System.out.print("Select a part name:");

partName = selectPartName.get();

System.out.print(

"Select installation time limit:");

timeLimit = selectTimeLimit.get();

parts.stream()

.filter(x -> x.name.equals(partName))

.filter(x -> x.hoursToInstall < timeLimit)

.forEach(x -> System.out.println(x));

break;

default: // 5

System.out.println("Bye Bye.");

done = true;

}

}

}

}