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

    	}

    } 

}