package org.apidesign.apifest08.test;

 import java.math.BigDecimal;

 import java.util.Currency;

 import junit.framework.TestCase;

 import org.apidesign.apifest08.currency.Convertor;

 import org.apidesign.apifest08.currency.ConvertorFactory;

 import org.apidesign.apifest08.currency.InvalidConversionException;

 /** 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 final static Currency CZK;

     private final static Currency SKK;

     private final static Currency USD;

     static

     {

         CZK = Currency.getInstance("CZK");

         SKK = Currency.getInstance("SKK");

         USD = Currency.getInstance("USD");

     }

     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 Convertor createCZKtoUSD()

     {

         return (ConvertorFactory.getConvertor("CZK", BigDecimal.valueOf(17.0), "USD", BigDecimal.valueOf(1)));

     }

     /** 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 Convertor createSKKtoCZK()

     {

         return (ConvertorFactory.getConvertor(Currency.getInstance("SKK"), BigDecimal.valueOf(100), Currency.getInstance("CZK"), BigDecimal.valueOf(80)));

     }

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

      * with it.

      */

     public void testCurrencyCZKUSD() throws Exception {

         Convertor  c = createCZKtoUSD();

         BigDecimal result;

         // convert $5 to CZK using c:

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

         result = c.convert(USD, CZK, BigDecimal.valueOf(5));

         assertEquals(new BigDecimal("85.00"), result);

         // convert $8 to CZK

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

         result = c.convert(USD, CZK, BigDecimal.valueOf(8));

         assertEquals(new BigDecimal("136.00"), result);

         // convert 1003CZK to USD

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

         result = c.convert(CZK, USD, BigDecimal.valueOf(1003));

         assertEquals(new BigDecimal("59.00"), result);

     }

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

      * with it.

      */

     public void testCurrencySKKCZK() throws Exception {

         Convertor c = createSKKtoCZK();

         BigDecimal result;

         // convert 16CZK using c:

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

         result = c.convert(CZK, SKK, BigDecimal.valueOf(16));

         assertEquals(new BigDecimal("20.00"), result);

         // convert 500SKK to CZK

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

         result = c.convert(SKK, CZK, BigDecimal.valueOf(500));

         assertEquals(new BigDecimal("400.00"), result);

    }

     /** 

      * Verify that the CZK to USD convertor knows nothing about SKK.

      */

     public void testCannotConvertToSKKwithCZKUSDConvertor() 

         throws Exception 

     {

         Convertor c = createCZKtoUSD();

         try

         {

             // convert $5 to SKK, the API shall say this is not possible

             c.convert(USD, SKK, BigDecimal.valueOf(5));

             fail("cannot use the CZKtoUSD converter to convert to SKK");

         }

         catch(InvalidConversionException ex)

         {       

             assertEquals("cannot convert to: SKK", ex.getMessage());

             assertEquals(SKK, ex.getBadCurrency());

             assertEquals(CZK, ex.getCurrencyA());

             assertEquals(USD, ex.getCurrencyB());

         }

         try

         {

             // convert 500 SKK to CZK, the API shall say this is not possible

             c.convert(SKK, CZK, BigDecimal.valueOf(5));

             fail("cannot use the CZKtoUSD converter to convert from SKK");

         }

         catch(InvalidConversionException ex)

         {            

             assertEquals("cannot convert from: SKK", ex.getMessage());

             assertEquals(SKK, ex.getBadCurrency());

             assertEquals(CZK, ex.getCurrencyA());

             assertEquals(USD, ex.getCurrencyB());

         }

     }

     /** 

      * Verify that the CZK to SKK convertor knows nothing about USD.

      */

     public void testCannotConvertToUSDwithSKKCZKConvertor() 

         throws Exception 

     {

         Convertor c = createSKKtoCZK();

         try

         {

             // convert $5 to SKK, the API shall say this is not possible

             c.convert(USD, SKK, BigDecimal.valueOf(5));

             fail("cannot use the CZKtoUSD converter to convert to SKK");

         }

         catch(InvalidConversionException ex)

         {       

             assertEquals("cannot convert from: USD", ex.getMessage());

             assertEquals(USD, ex.getBadCurrency());

             assertEquals(SKK, ex.getCurrencyA());

             assertEquals(CZK, ex.getCurrencyB());

         }

         try

         {

             // convert 500 CZK to USD, the API shall say this is not possible

             c.convert(CZK, USD, BigDecimal.valueOf(500));

             fail("cannot use the CZKtoUSD converter to convert from SKK");

         }

         catch(InvalidConversionException ex)

         {            

             assertEquals("cannot convert to: USD", ex.getMessage());

             assertEquals(USD, ex.getBadCurrency());

             assertEquals(SKK, ex.getCurrencyA());

             assertEquals(CZK, ex.getCurrencyB());

         }

     }

 }