package org.apidesign.apifest08.test;

 import static org.apidesign.apifest08.test.Currencies.CZK;

 import static org.apidesign.apifest08.test.Currencies.SKK;

 import static org.apidesign.apifest08.test.Currencies.USD;

 import java.math.BigDecimal;

 import junit.framework.TestCase;

 import org.apidesign.apifest08.currency.Amount;

 import org.apidesign.apifest08.currency.ConversionException;

 import org.apidesign.apifest08.currency.Convertor;

 import org.apidesign.apifest08.currency.UnsupportedConversionException;

 /** 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 {

     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 new Convertor(new BigDecimal(17), USD, CZK);

     }

     /** 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 new Convertor(new BigDecimal("0.8"), SKK, CZK);

     }

     /** 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:

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

         assertEquals("Result is 85 CZK", 85, result.getValue().intValue());

         // convert $8 to CZK

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

         assertEquals("Result is 136 CZK", 136, result.getValue().intValue());

         // convert 1003CZK to USD

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

         assertEquals("Result is 59 USD", 59, result.getValue().intValue());

     }

     /** 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:

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

         assertEquals("Result is 20 SKK", 20, result.getValue().intValue());

         // convert 500SKK to CZK

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

         assertEquals("Result is 400 CZK", 400, result.getValue().intValue());

     }

     /**

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

      */

      public void testCannotConvertToSKKwithCZKUSDConvertor() throws Exception {

     	 Convertor c = createCZKtoUSD();

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

     	 try {

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

     		 fail("convert $5 to SKK, the API shall say this is not possible");

     	 } catch (ConversionException e) {

     		 //expected

     	 }

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

     	 try {

     		 c.convert(new BigDecimal("500"), SKK, CZK);

     		 fail("convert 500 SKK to CZK, the API shall say this is not possible");

     	 } catch (ConversionException e) {

     		 //expected

     	 }

      }

     /** 

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

      */

     public void testCannotConvertToSKKwithCZKSKKConvertor() throws Exception {

     	Convertor c = createSKKtoCZK();

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

     	try {

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

     		fail("convert $5 to SKK, the API shall say this is not possible");

     	} catch(ConversionException e) {

     		//expected

     	}

     	try {

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

     		fail("convert 500 CZK to USD, the API shall say this is not possible");

     	} catch(ConversionException e) {

     		//expected

     	}

     } 

 }