package com.lun.c05;

import java.util.*;

import static java.util.Comparator.comparing;
import static java.util.stream.Collectors.toList;

public class PuttingIntoPractice {
	public static void main(String... args) {
		Trader raoul = new Trader("Raoul", "Cambridge");
		Trader mario = new Trader("Mario", "Milan");
		Trader alan = new Trader("Alan", "Cambridge");
		Trader brian = new Trader("Brian", "Cambridge");

		List<Transaction> transactions = Arrays.asList(new Transaction(brian, 2011, 300),
				new Transaction(raoul, 2012, 1000),
				new Transaction(raoul, 2011, 400),
				new Transaction(mario, 2012, 710),
				new Transaction(mario, 2012, 700),
				new Transaction(alan, 2012, 950));

		// Query 1: Find all transactions from year 2011 and sort them by value (small
		// to high).
		List<Transaction> tr2011 = transactions.stream()
				.filter(transaction -> transaction.getYear() == 2011)
				.sorted(comparing(Transaction::getValue))
				.collect(toList());
		System.out.println(tr2011);

		// Query 2: What are all the unique cities where the traders work?
		List<String> cities = transactions.stream()
				.map(transaction -> transaction.getTrader().getCity())
				.distinct()
				.collect(toList());
		System.out.println(cities);

		// Query 3: Find all traders from Cambridge and sort them by name.

		List<Trader> traders = transactions.stream()
				.map(Transaction::getTrader)
				.filter(trader -> trader.getCity().equals("Cambridge"))
				.distinct()
				.sorted(comparing(Trader::getName))
				.collect(toList());
		System.out.println(traders);

		// Query 4: Return a string of all traders’ names sorted alphabetically.

		String traderStr = transactions.stream()
				.map(transaction -> transaction.getTrader().getName())
				.distinct()
				.sorted()
				.reduce("", (n1, n2) -> n1 + n2);
		System.out.println(traderStr);

		// Query 5: Are there any trader based in Milan?

		boolean milanBased = transactions.stream()
				.anyMatch(transaction -> transaction.getTrader().getCity().equals("Milan"));
		System.out.println(milanBased);

		// Query 6: Update all transactions so that the traders from Milan are set to
		// Cambridge.
		transactions.stream()
				.map(Transaction::getTrader)
				.filter(trader -> trader.getCity().equals("Milan"))
				.forEach(trader -> trader.setCity("Cambridge"));
		System.out.println(transactions);

		// Query 7: What's the highest value in all the transactions?
		int highestValue = transactions.stream()
				.map(Transaction::getValue)
				.reduce(0, Integer::max);
		
		System.out.println(highestValue);
	}
}