package org.apidesign.apifest08.test;

 import java.math.BigDecimal;

 import junit.framework.TestCase;

 import org.apidesign.apifest08.currency.ConversionResult;

 import org.apidesign.apifest08.currency.Convertor;

 import org.apidesign.apifest08.currency.ConvertorCurrency;

 import org.apidesign.apifest08.currency.ExchangeRateProvider;

 import org.apidesign.apifest08.currency.ConversionNotSupportedException;

 /** 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() {

         ConvertorCurrency fromCurrency = ConvertorCurrency.getInstance("CZK");

         ConvertorCurrency toCurrency = ConvertorCurrency.getInstance("USD");

         ExchangeRateProvider exchangeRateProvider = new ExchangeRateProvider(new BigDecimal(17), fromCurrency, new BigDecimal(1), toCurrency);

         return Convertor.createConvertor(exchangeRateProvider);

     }

     /** 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() {

         ConvertorCurrency fromCurrency = ConvertorCurrency.getInstance("SKK");

         ConvertorCurrency toCurrency = ConvertorCurrency.getInstance("CZK");

         ExchangeRateProvider exchangeRateProvider = new ExchangeRateProvider(new BigDecimal(100), fromCurrency, new BigDecimal(80), toCurrency);

         return Convertor.createConvertor(exchangeRateProvider);

     }

     public static Convertor createCZKtoYEN() {

         ConvertorCurrency fromCurrency = ConvertorCurrency.getInstance("CZK");

         ConvertorCurrency toCurrency = ConvertorCurrency.getInstance("JPY");

         ExchangeRateProvider exchangeRateProvider = new ExchangeRateProvider(new BigDecimal(1), fromCurrency, new BigDecimal(1), toCurrency);

         return Convertor.createConvertor(exchangeRateProvider);

     }

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

      * with it.

      */

     public void testCurrencyCZKUSD() throws Exception {

         Convertor convertCzkUsd = createCZKtoUSD();

         {

             // convert $1 to CZK using c:

             ConversionResult result = convertCzkUsd.convertBack(new BigDecimal(1));

             assertEquals("Result is 17 CZK", new BigDecimal("17.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

         {

             // convert 17CKZ to $ using c:

             ConversionResult result = convertCzkUsd.convert(new BigDecimal(17));

             assertEquals("Result is 1 $", new BigDecimal("1.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

         {

             // convert $5 to CZK using c:

             ConversionResult result = convertCzkUsd.convertBack(new BigDecimal(5));

             assertEquals("Result is 85 CZK", new BigDecimal("85.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

         {

             // convert $8 to CZK

             ConversionResult result = convertCzkUsd.convertBack(new BigDecimal(8));

             assertEquals("Result is 136 CZK", new BigDecimal("136.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

         {

             // convert 1003CZK to USD

             ConversionResult result = convertCzkUsd.convert(new BigDecimal(1003));

             assertEquals("Result is 59 USD", new BigDecimal("59.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

     }

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

      * with it.

      */

     public void testCurrencySKKCZK() throws Exception {

         Convertor convertSkkCzk = createSKKtoCZK();

         {

             // convert 100SKK using c:

             ConversionResult result = convertSkkCzk.convert(new BigDecimal(100));

             assertEquals("Result is 80 CZK", new BigDecimal("80.00"), result.getConverted());

         }

         {

             // convert 80CZK using c:

             ConversionResult result = convertSkkCzk.convertBack(new BigDecimal(80));

             assertEquals("Result is 100 SKK", new BigDecimal("100.00"), result.getConverted());

         }

         {

             // convert 16CZK using c:

             ConversionResult result = convertSkkCzk.convertBack(new BigDecimal(16));

             assertEquals("Result is 20 SKK", new BigDecimal("20.00"), result.getConverted());

         }

         {

             // convert 500SKK to CZK

             ConversionResult result = convertSkkCzk.convert(new BigDecimal(500));

             assertEquals("Result is 400 CZK", new BigDecimal("400.00"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());            

         }

         {

             // convert 501SKK to CZK

             ConversionResult result = convertSkkCzk.convert(new BigDecimal(501));

             assertEquals("Result is 400 CZK", new BigDecimal("400.80"), result.getConverted());

             assertEquals("No Remainer", BigDecimal.ZERO, result.getRemainder());

         }

     }

     /**

      * Convert SKK to CZK. Convertor can't convert whole amout (can't convert one SKK cent to CZK). Remaining

      * amount is stored in remainder result.

      * 

      * Test is currently failing, because implementation can't handle this case.

      */

 //    public void testConvertSmallUnits_failing() {

 //        Convertor convertSkkCzk = createSKKtoCZK();

 //        {

 //            // convert 501SKK to CZK

 //            ConversionResult result = convertSkkCzk.convert(new BigDecimal("501.01"));

 //            assertEquals("Result is 400 CZK", new BigDecimal("400.80"), result.getConverted());

 //            assertEquals("No Remainer", new BigDecimal("0.01"), result.getRemainder());

 //            

 //        }

 //        

 //    }

     /**

      * Test converting from CZK to JPY. Remained has scale of CZK.

      * 

      * This test is currently failing, because converter implementation currently can't handle conversion from "cent" to "no-cent" currency.

      */

 //    public void testConvertCzkToJpy_failing() {

 //        Convertor convertSkkCzk = createCZKtoYEN();

 //        {

 //            // convert 501SKK to CZK

 //            ConversionResult result = convertSkkCzk.convert(new BigDecimal("120.00"));

 //            assertEquals("Result is 120 YEN", new BigDecimal("120"), result.getConverted());

 //            assertEquals("No Remainer", new BigDecimal("0.00"), result.getRemainder());

 //            

 //        }

 //    }

     /**

      * Test converting from JPY to CZK. Remained has scale of JPY.

      * 

      * This test is currently failing, because converter implementation currently can't handle conversion from "cent" to "no-cent" currency.

      */

 //    public void testConvertJpyToCzk_failing() {

 //        Convertor convertSkkCzk = createCZKtoYEN();

 //        {

 //            // convert 501SKK to CZK

 //            ConversionResult result = convertSkkCzk.convert(new BigDecimal("120.00"));

 //            assertEquals("Result is 120 YEN", new BigDecimal("120"), result.getConverted());

 //            assertEquals("No Remainer", new BigDecimal("0"), result.getRemainder());

 //            

 //        }

 //    }

     public void testCannotConvertToSKKwithCZKUSDConvertor() throws Exception {

             Convertor c = createCZKtoUSD();

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

             try {

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

                 fail();

             } catch (ConversionNotSupportedException e) {

                 //expected error;

                 assertEquals("Exception From USD", "USD",e.getFromCurrecyCode());

                 assertEquals("Exception To SKK", "SKK",e.getToCurrecyCode());

             }

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

             try {

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

                 fail();

             } catch (ConversionNotSupportedException e) {

                 assertEquals("Exception From USD", "SKK",e.getFromCurrecyCode());

                 assertEquals("Exception To SKK", "CZK",e.getToCurrecyCode());            }

     }

 }