package org.apidesign.apifest08.test;

 import junit.framework.TestCase;

 import org.apidesign.apifest08.currency.*;

 import java.math.BigDecimal;

 import java.math.RoundingMode;

 import java.util.Currency;

 /**

  * 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 CurrencyConvertorFactory currencyConvertorFactoryInstance;

     public Task1Test(String testName) {

         super(testName);

     }

     @Override

     protected void setUp() throws Exception {

         currencyConvertorFactoryInstance = ConvertorsFactory.getCurrencyConvertorFactoryInstance();

     }

     @Override

     protected void tearDown() throws Exception {

         currencyConvertorFactoryInstance = null;

     }

     /**

      * Create convertor that understands two currencies, CZK and

      * USD. Make 1 USD == 17 CZK.

      * <p/>

      * 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 Convertor createCZKtoUSD() throws ConvertorNotAvailableException {

         final Currency czk = Currency.getInstance("CZK");

         final Currency usd = Currency.getInstance("USD");

         final BigDecimal constant = BigDecimal.ONE.divide(BigDecimal.valueOf(17), 10, RoundingMode.HALF_EVEN);

         return currencyConvertorFactoryInstance.createConvertor(czk, usd, ConversionProperties.create(constant, RoundingMode.HALF_EVEN));

     }

     /**

      * Create convertor that understands two currencies, CZK and

      * SKK. Make 100 SKK == 80 CZK.

      * <p/>

      * 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 Convertor createSKKtoCZK() throws ConvertorNotAvailableException {

         final Currency skk = Currency.getInstance("SKK");

         final Currency czk = Currency.getInstance("CZK");

         final BigDecimal constant = new BigDecimal("0.8");

         return currencyConvertorFactoryInstance.createConvertor(skk, czk, ConversionProperties.create(constant, RoundingMode.HALF_EVEN));

     }

     /**

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

      * with it.

      */

     public void testCurrencyCZKUSD() throws Exception {

         Convertor c = createCZKtoUSD();

         // convert $5 to CZK using c:

         final int czkDigitsScale = c.getCurrency1().getDefaultFractionDigits();

         final int usdDigitsScale = c.getCurrency2().getDefaultFractionDigits();

         assertEquals("Result is 85 CZK", BigDecimal.valueOf(85).setScale(czkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(5)));

         // convert $8 to CZK

         assertEquals("Result is 136 CZK", BigDecimal.valueOf(136).setScale(czkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(8)));

         // convert 1003CZK to USD

         assertEquals("Result is 59 USD", BigDecimal.valueOf(59).setScale(usdDigitsScale), c.convertCurrency1ToCurrency2(BigDecimal.valueOf(1003)));

     }

     /**

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

      * with it.

      */

     public void testCurrencySKKCZK() throws Exception {

         Convertor c = createSKKtoCZK();

         // convert 16CZK using c:

         final int skkDigitsScale = c.getCurrency1().getDefaultFractionDigits();

         final int czkDigitsScale = c.getCurrency2().getDefaultFractionDigits();

         assertEquals("Result is 20 SKK", BigDecimal.valueOf(20).setScale(skkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(16)));

         // convert 500SKK to CZK

         assertEquals("Result is 400 CZK", BigDecimal.valueOf(400).setScale(czkDigitsScale), c.convertCurrency1ToCurrency2(BigDecimal.valueOf(500)));

     }

 }