import groovy.json.JsonSlurper
import java.text.DecimalFormat
import java.text.SimpleDateFormat

void Zadanie1()
{
	// a)
	def list1 = [ 'a', 'b', 'c']
	def list2 = [ 1, 8, 23 ]
	
	// b)
	def list11 = list1.collect { it * 2 }
	def list12 = list2.collect { it * 2 }
	
	// a)
	println "A)"
	list1.each { println it }
	list2.each { println it }
	// b)
	println "B)"
	list11.each { println it }
	list12.each { println it }
}

void Zadanie2()
{
	def pmap = [ 
		Groovy: [ 'Asia', 'Jan' ],
		Grails: [ 'Asia', 'Jan', 'Stefan', 'Mirek' ],
		Java: [ 'Asia', 'Stefan', 'Mirek' ],
		JEE: [ 'Slawek', 'Stefan', 'Janusz' ]
	]
	
	// a)
	println "A)"
	pmap.each { k, v -> println k + ": " + v.size }

	// b)
	println "B)"
	pmap.findAll({ k, v -> v.size > 2 })
		.each { println it }
	
	// c)
	println "C)"
	def programmerLanguages = [:].withDefault { [] }
	pmap.each { k, v ->
		v.each {
			programmerLanguages[it] += k
		}
	}
	programmerLanguages.each { k, v -> println k + ": " + v }
}

void Zadanie3()
{
	def datesString = "abc 1234 2003-34-23 23 67-78 452003-02-28"
	def matchedDates = datesString =~ /(\d+){4}-(\d+){2}-(\d+){2}/
	
	def dateParser = new SimpleDateFormat("yyyy-MM-dd")
	dateParser.lenient = false // throws exception if date is invalid
	
	matchedDates.each {
		try {
			println dateParser.parse(it[0])
		} catch(e) {}
	}
}

BigDecimal getCurrentPlnToEuroRate()
{
	def euroToPln = (new JsonSlurper()).parse(new URL('http://api.nbp.pl/api/exchangerates/rates/A/EUR?format=json'))["rates"][0]["mid"]
	return 1 / euroToPln
}

void Zadanie4()
{
	def matchRealNumbersRegex = /((\+|-)?([0-9]+)([.][0-9]+)?)/
	def matchPricesRegex = /((\+|-)?([0-9]+)([.][0-9]+)?[ ][P][L][N])/
	// a)
	println "A)"
	def realNumbersString = "cośtam 3 4.5 wersja-0.3 podwersja 4 minus -8.5kg"
	def matchedRealNumbers = realNumbersString =~ matchRealNumbersRegex
	
	matchedRealNumbers.each { println it[0] }
	
	// b)
	println "B)"
	def pricesString = "jajka 5 PLN; mleko 3.5 PLN; chleb 2.13 PLN, a banany po 10 PLNów"
	
	def plnToEurRate = getCurrentPlnToEuroRate()
	def decimalFormatter = new DecimalFormat("###,##0.00");
	
	def euroPricesString = pricesString.replaceAll(matchPricesRegex, {
		def price = (it[0] =~ matchRealNumbersRegex)[0][0] as BigDecimal
		return decimalFormatter.format(price * plnToEurRate) + " EUR"
	})
	
	println pricesString
	println euroPricesString
}

Zadanie1()
Zadanie2()
Zadanie3()
Zadanie4()