package org.apidesign.apifest08.currency;

/** This is the skeleton class for your API. You need to make it public, so

 * it is accessible to your client code (currently in Task1Test.java) file.

 * <p>

 * Feel free to create additional classes or rename this one, just keep all

 * the API and its implementation in this package. Do not spread it outside

 * to other packages.

 */

public final class Convertor {

    private String currency1;

    private String currency2;

    private Rate rate;

    Convertor(String currency1, String currency2, Rate rate) {

        if ((currency1 == null)||(currency2 == null)||(rate == null)) {

            throw new IllegalArgumentException("All arguments have to be non-null.");

        }

        this.currency1 = currency1;

        this.currency2 = currency2;

        this.rate = rate;

    }

    public double convert(String fromCurrency, String toCurrency, int amount) {

        if ((fromCurrency == null)||(toCurrency == null)) {

            throw new IllegalArgumentException("All arguments have to be non-null.");            

        }

        if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {

            return rate.convertAtoB(amount);

        } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {

            return rate.convertBtoA(amount);

        } else {

            throw new IllegalArgumentException("Convertor " + this.toString() + 

                    " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");

        }

    }

    public double convert(String fromCurrency, String toCurrency, double amount) {

        if ((fromCurrency == null)||(toCurrency == null)) {

            throw new IllegalArgumentException("All arguments have to be non-null.");            

        }

        if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {

            return rate.convertAtoB(amount);

        } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {

            return rate.convertBtoA(amount);

        } else {

            throw new IllegalArgumentException("Convertor " + this.toString() + 

                    " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");

        }

    }

    @Override

    public String toString() {

        return currency1+currency2;

    }

    @Override

    public boolean equals(Object obj) {

        if (obj == null) {

            return false;

        }

        if (getClass() != obj.getClass()) {

            return false;

        }

        final Convertor other = (Convertor) obj;

        if (this.currency1 != other.currency1 && (this.currency1 == null || !this.currency1.equals(other.currency1))) {

            return false;

        }

        if (this.currency2 != other.currency2 && (this.currency2 == null || !this.currency2.equals(other.currency2))) {

            return false;

        }

        if (this.rate != other.rate && (this.rate == null || !this.rate.equals(other.rate))) {

            return false;

        }

        return true;

    }

    @Override

    public int hashCode() {

        int hash = 5;

        hash = 67 * hash + (this.currency1 != null ? this.currency1.hashCode() : 0);

        hash = 67 * hash + (this.currency2 != null ? this.currency2.hashCode() : 0);

        hash = 67 * hash + (this.rate != null ? this.rate.hashCode() : 0);

        return hash;

    }

}