package org.apidesign.apifest08.test;

import java.util.Currency;

import junit.framework.TestCase;

import org.apidesign.apifest08.currency.ConversionRate;

import org.apidesign.apifest08.currency.Convertor;

import org.apidesign.apifest08.currency.MonetaryAmount;

import org.apidesign.apifest08.currency.TableConvertor;

/** 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 {

    }

    protected static final Currency CZK = Currency.getInstance( "CZK" );

    protected static final Currency SKK = Currency.getInstance( "SKK" );

    protected static final Currency USD = Currency.getInstance( "USD" );

    /** 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() {

        final TableConvertor convertor = new TableConvertor();

        final MonetaryAmount amountInCZK = new MonetaryAmount( 17, CZK );

        final MonetaryAmount amountInUSD = new MonetaryAmount( 1, USD );

        convertor.putIntoTable( new ConversionRate( amountInCZK, amountInUSD ) );

        convertor.putIntoTable( new ConversionRate( amountInUSD, amountInCZK ) );

        return new ContractImposingDelegatingConvertor( convertor ).test();

    }

    /** 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() {

        final TableConvertor convertor = new TableConvertor();

        final MonetaryAmount amountInSKK = new MonetaryAmount( 100, SKK );

        final MonetaryAmount amountInCZK = new MonetaryAmount( 80, CZK );

        convertor.putIntoTable( new ConversionRate( amountInSKK, amountInCZK ) );

        convertor.putIntoTable( new ConversionRate( amountInCZK, amountInSKK ) );

        return new ContractImposingDelegatingConvertor( convertor ).test();

    }

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

     * with it.

     */

    public void testCurrencyCZKUSD() throws Exception {

        final Convertor c = createCZKtoUSD();

        // convert $5 to CZK using c:

        final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), CZK ) );

        final MonetaryAmount a1 = r1.getNetAmount();

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

        assertNotNull( a1 );

        assertEquals( 85.0, a1.getAmount().doubleValue() );

        assertEquals( CZK, a1.getCurrency() );

        // convert $8 to CZK

        final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 8, USD ), CZK ) );

        final MonetaryAmount a2 = r2.getNetAmount();

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

        assertNotNull( a2 );

        assertEquals( 136.0, a2.getAmount().doubleValue() );

        assertEquals( CZK, a2.getCurrency() );

        // convert 1003CZK to USD

        final Convertor.ConversionResult r3 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 1003, CZK ), USD ) );

        final MonetaryAmount a3 = r3.getNetAmount();

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

        assertNotNull( a3 );

        assertEquals( 59.0, a3.getAmount().doubleValue() );

        assertEquals( USD, a3.getCurrency() );

    }

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

     * with it.

     */

    public void testCurrencySKKCZK() throws Exception {

        final Convertor c = createSKKtoCZK();

        // convert 16CZK using c:

        final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 16, CZK ), SKK ) );

        final MonetaryAmount a1 = r1.getNetAmount();

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

        assertNotNull( a1 );

        assertEquals( 20.0, a1.getAmount().doubleValue() );

        assertEquals( SKK, a1.getCurrency() );

        // convert 500SKK to CZK

        final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 500, SKK ), CZK ) );

        final MonetaryAmount a2 = r2.getNetAmount();

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

        assertNotNull( a2 );

        assertEquals( 400.0, a2.getAmount().doubleValue() );

        assertEquals( CZK, a2.getCurrency() );

    }

}