package org.apidesign.apifest08.test;

import junit.framework.*;

import org.apidesign.apifest08.currency.*;

import java.util.*;

/** Finish the Convertor API, and then write bodies of methods inside

 * of this class to match the given tasks. To fullfil your task, use the

 * API define in the <code>org.apidesign.apifest08.currency</code> package.

 * Do not you reflection, or other hacks as your code

 * shall run without any runtime permissions.

 */

public class Task1Test extends TestCase {

	private static final String

			USD = "USD",

			CZK = "CZK",

			SKK = "SKK";

	private static final Currency

			USD2 = Currency.getInstance(USD),

			CZK2 = Currency.getInstance(CZK),

			SKK2 = Currency.getInstance(SKK);

	public Task1Test(String testName) {

    	super(testName);

    }

    @Override

    protected void setUp() throws Exception {

	}

    @Override

    protected void tearDown() throws Exception {

    }

    /** Create convertor that understands two currencies, CZK and

     *  USD. Make 1 USD == 17 CZK.

     *

     * Creation of the convertor shall not require subclassing of any class

     * or interface on the client side.

     *

     * @return prepared convertor ready for converting USD to CZK and CZK to USD

     */

    public static CurrencyConverter createCZKtoUSD() {

		return OfflineConverterProvider.getInstance().getConverter(17, CZK, 1, USD);

    }

	public static CurrencyConverter createCZKtoUSD2() {

		return OfflineConverterProvider.getInstance().getConverter(CZK, USD);

    }

    /** Create convertor that understands two currencies, CZK and

     *  SKK. Make 100 SKK == 80 CZK.

     *

     * Creation of the convertor shall not require subclassing of any class

     * or interface on the client side.

     * 

     * @return prepared convertor ready for converting SKK to CZK and CZK to SKK

     */

    public static CurrencyConverter createSKKtoCZK() {

        return OfflineConverterProvider.getInstance().getConverter(100, SKK, 80, CZK);

    }

	public static CurrencyConverter createSKKtoCZK2() {

        return OfflineConverterProvider.getInstance().getConverter(SKK, CZK);

    }

    /** Use the convertor from <code>createCZKtoUSD</code> method and do few conversions

     * with it.

     */

    public void testCurrencyCZKUSD() throws Exception {

		CurrencyConverter c = createCZKtoUSD();

		testCZKUSD(c);

		// test without specifying rates

		c = createCZKtoUSD2();

		testCZKUSD(c);

	}

	private void testCZKUSD(CurrencyConverter c) {

		double czk, usd;

		// convert $5 to CZK using c:

		// assertEquals("Result is 85 CZK");

		czk = c.convert(5, USD, CZK);

		assertEquals(85.0, czk, 0.0);

		czk = c.convert(5, USD2, CZK2);

		assertEquals(85.0, czk, 0.0);

		// convert $8 to CZK

		// assertEquals("Result is 136 CZK");

		czk = c.convert(8, USD, CZK);

		assertEquals(136.0, czk, 0.0);

		czk = c.convert(8, USD2, CZK2);

		assertEquals(136.0, czk, 0.0);

		// convert 1003CZK to USD

		// assertEquals("Result is 59 USD");

		usd = c.convert(1003, CZK, USD);

		assertEquals(59.0, usd, 0.0);

		usd = c.convert(1003, CZK2, USD2);

		assertEquals(59.0, usd, 0.0);

	}

	/** Use the convertor from <code>createSKKtoCZK</code> method and do few conversions

     * with it.

     */

    public void testCurrencySKKCZK() throws Exception {

		CurrencyConverter c = createSKKtoCZK();

		testCZKSKK(c);

		// test without specifying rates

		c = createSKKtoCZK2();

		testCZKSKK(c);

	}

	private void testCZKSKK(CurrencyConverter c) {

		double czk, skk;

		// convert 16CZK using c:

		// assertEquals("Result is 20 SKK");

		skk = c.convert(16, CZK, SKK);

		assertEquals(20.0, skk, 0.0);

		skk = c.convert(16, CZK2, SKK2);

		assertEquals(20.0, skk, 0.0);

		// convert 500SKK to CZK

		// assertEquals("Result is 400 CZK");

		czk = c.convert(500, SKK, CZK);

		assertEquals(400.0, czk, 0.0);

		czk = c.convert(500, SKK2, CZK2);

		assertEquals(400.0, czk, 0.0);

	}

}