/**
 * Copyright (c) 2006, 2013, Werner Keil and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Werner Keil - initial API and implementation
 */
package org.eclipse.uomo.business.money;

import static org.eclipse.uomo.business.money.MonetaryUnits.ISO_NAMESPACE;

//import java.util.Currency;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;

import org.eclipse.uomo.business.internal.CurrencyUnit;
import org.eclipse.uomo.business.internal.Localizable;

import com.ibm.icu.util.Currency;
import com.ibm.icu.util.ULocale;

/**
 * Adapter that implements the  {@link CurrencyUnit} interface using the
 * ICU4J {@link com.ibm.icu.util.Currency}.
 * 
 * @version 0.2.3
 * @author Werner Keil
 * @deprecated merge into MoneyUnit
 */
public class MoneyCurrency extends com.ibm.icu.util.Currency implements CurrencyUnit, Localizable {

	/**
	 * serialVersionUID.
	 */
	private static final long serialVersionUID = -2523936311372374236L;

	/** namespace for this currency. */
	private final String namespace;
	/** currency code for this currency. */
	private final String currencyCode;
	/** valid from, or {@code null}. */
	private final Long validFrom;
	/** valid until, or {@code null}. */
	private final Long validUntil;
	/** true, if legal tender. */
	private final boolean legalTender;
	/** true, if it is a virtual currency. */
	private final boolean virtual;

	private static final Map<String, MoneyCurrency> CACHED = new ConcurrentHashMap<String, MoneyCurrency>();

	private static final Logger LOGGER = Logger.getLogger(MoneyCurrency.class
			.getName());

	/**
	 * Private constructor.
	 * 
	 * @param currency
	 */
	private MoneyCurrency(String namespace, String code, int numCode,
			int fractionDigits, Long validFrom, Long validUntil, boolean legal,
			boolean virtual) {
		super(code);
		this.namespace = namespace;
		this.currencyCode = code;
		this.validFrom = validFrom;
		this.validUntil = validUntil;
		this.legalTender = legal;
		this.virtual = virtual;
	}

	/**
	 * Private constructor.
	 * 
	 * @param currency
	 */
	private MoneyCurrency(Currency currency) {
		super(currency != null ? currency.getCurrencyCode() : "");
		if (currency == null) {
			throw new IllegalArgumentException("Currency required.");
		}
		this.namespace = ISO_NAMESPACE;
		this.currencyCode = currency.getCurrencyCode();
		currency.getDefaultFractionDigits();
		this.validFrom = null;
		this.validUntil = null; // TODO Adapt for hisotoric one, e.g. AFA
		this.legalTender = !this.currencyCode.startsWith("X"); // TODO check for
																// each code in
																// util.Currency
																// here;
		this.virtual = this.currencyCode.equals("XXX"); // TODO check for each
														// code in util.Currency
														// here;
	}

	/**
	 * Access a new instance based on {@link Currency}.
	 * 
	 * @param currency
	 *            the currency unitm not null.
	 * @return the new instance, never null.
	 */
	public static MoneyCurrency of(Currency currency) {
		String key = ISO_NAMESPACE + ':' + currency.getCurrencyCode();
		MoneyCurrency cachedItem = CACHED.get(key);
		if (cachedItem == null) {
			cachedItem = new ICUCurrencyAdapter(currency);
			CACHED.put(key, cachedItem);
		}
		return cachedItem;
	}

	/**
	 * Access a new instance based on {@link Currency}.
	 * 
	 * @param currency
	 *            the currency unitm not null.
	 * @return the new instance, never null.
	 */
//	public static MoneyCurrency of(com.ibm.icu.util.Currency currency) {
//		String key = ISO_NAMESPACE + ':' + currency.getCurrencyCode();
//		MoneyCurrency cachedItem = CACHED.get(key);
//		if (cachedItem == null) {
//			cachedItem = new ICUCurrencyAdapter(currency);
//			CACHED.put(key, cachedItem);
//		}
//		return cachedItem;
//	}
//	
	/**
	 * Access a new instance based on the ISO currency code. The code must
	 * return a {@link Currency} when passed to
	 * {@link Currency#getInstance(String)}.
	 * 
	 * @param currencyCode
	 *            the ISO currency code, not null.
	 * @return the corresponding {@link MonetaryCurrency} instance.
	 */
	public static MoneyCurrency of(String currencyCode) {
		return of(Currency.getInstance(currencyCode));
	}

	/**
	 * Access a new instance based on the ISO currency code. The code must
	 * return a {@link Currency} when passed to
	 * {@link Currency#getInstance(String)}.
	 * 
	 * @param namespace
	 *            the target namespace.
	 * @param currencyCode
	 *            the ISO currency code, not null.
	 * @return the corresponding {@link MonetaryCurrency} instance.
	 */
	public static MoneyCurrency of(String namespace, String currencyCode) {
		String key = namespace + ':' + currencyCode;
		MoneyCurrency cu = CACHED.get(key);
		if (cu == null && namespace.equals(ISO_NAMESPACE)) {
			return of(currencyCode);
		}
		return cu;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#isVirtual()
	 */
	
	public boolean isVirtual() {
		return virtual;
	}

	/**
	 * Get the namepsace of this {@link CurrencyUnit}, returns 'ISO-4217'.
	 */
	
	public String getNamespace() {
		return namespace;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#getValidFrom()
	 */
	
	public Long getValidFrom() {
		return validFrom;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#getValidUntil()
	 */
	
	public Long getValidUntil() {
		return validUntil;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#getCurrencyCode()
	 */

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#getNumericCode()
	 */
	
//	public int getNumericCode() {
//		return numericCode;
//	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#getDefaultFractionDigits()
	 */
	
//	public int getDefaultFractionDigits() {
//		return defaultFractionDigits;
//	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.CurrencyUnit#isLegalTender()
	 */
	
	public boolean isLegalTender() {
		return legalTender;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Comparable#compareTo(java.lang.Object)
	 */
	public int compareTo(CurrencyUnit currency) {
		int compare = getNamespace().compareTo(currency.getNamespace());
		if (compare == 0) {
			compare = getCurrencyCode().compareTo(currency.getCurrencyCode());
		}
		if (compare == 0) {
			if (validFrom == null && currency.getValidFrom() != null) {
				compare = -1;
			} else if (validFrom != null && currency.getValidFrom() == null) {
				compare = 1;
			} else if (validFrom != null) {
				compare = validFrom.compareTo(currency.getValidFrom());
			}
		}
		if (compare == 0) {
			if (validUntil == null && currency.getValidUntil() != null) {
				compare = -1;
			} else if (validUntil != null && currency.getValidUntil() == null) {
				compare = 1;
			} else if (validUntil != null) {
				compare = validUntil.compareTo(currency.getValidUntil());
			}
		}
		return compare;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	
	public String toString() {
		if (ISO_NAMESPACE.equals(namespace)) {
			return currencyCode;
		}
		return namespace + ':' + currencyCode;
	}

	/**
	 * Builder class that supports building complex instances of
	 * {@link MoneyCurrency}.
	 * 
	 * @author Anatole Tresch
	 */
	public static final class Builder {
		/** namespace for this currency. */
		private String namespace;
		/** currency code for this currency. */
		private String currencyCode;
		/** numeric code, or -1. */
		private int numericCode = -1;
		/** fraction digits, or -1. */
		private int defaultFractionDigits = -1;
		/** valid from, or {@code null}. */
		private Long validFrom;
		/** valid until, or {@code null}. */
		private Long validUntil;
		/** true, if legal tender. */
		private boolean legalTender = true;
		/** true for virtual currencies. */
		private boolean virtual = false;

		/**
		 * Creates a new {@link Builder}.
		 */
		public Builder() {
		}

		/**
		 * Creates a new {@link Builder}, starting with the according ISO
		 * currency.
		 * 
		 * @param currencyCode
		 *            the ISO currency code.
		 */
		public Builder(String currencyCode) {
			this(ISO_NAMESPACE, currencyCode);
		}

		/**
		 * Creates a new {@link Builder}, starting with the namespace and code
		 * given.
		 * 
		 * @param namespace
		 *            the taregt namespace
		 * @param currencyCode
		 *            the currency code
		 */
		public Builder(String namespace, String currencyCode) {
			setNamespace(namespace);
			setCurrencyCode(currencyCode);
		}

		/**
		 * Set the namespace.
		 * 
		 * @param namespace
		 *            the namespace, not null
		 * @return the builder, for chaining
		 */
		public Builder setNamespace(String namespace) {
			if (namespace == null) {
				throw new IllegalArgumentException("namespace may not be null.");
			}
			this.namespace = namespace;
			return this;
		}

		/**
		 * Set the currency code.
		 * 
		 * @param namespace
		 *            the currency code, not null
		 * @return the builder, for chaining
		 */
		public Builder setCurrencyCode(String currencyCode) {
			if (currencyCode == null) {
				throw new IllegalArgumentException(
						"currencyCode may not be null.");
			}
			this.currencyCode = currencyCode;
			return this;
		}

		/**
		 * Set the default fraction digits.
		 * 
		 * @param defaultFractionDigits
		 *            the default fraction digits
		 * @return the builder, for chaining
		 */
		public Builder setDefaultFractionDigits(int defaultFractionDigits) {
			if (defaultFractionDigits < -1) {
				throw new IllegalArgumentException(
						"Invalid value for defaultFractionDigits: "
								+ defaultFractionDigits);
			}
			this.defaultFractionDigits = defaultFractionDigits;
			return this;
		}

		/**
		 * Set the numeric currency code.
		 * 
		 * @param numericCode
		 *            the numeric currency code
		 * @return the builder, for chaining
		 */
		public Builder setNumericCode(int numericCode) {
			if (numericCode < -1) {
				throw new IllegalArgumentException(
						"Invalid value for numericCode: " + numericCode);
			}
			this.numericCode = numericCode;
			return this;
		}

		/**
		 * Sets the start UTC timestamp for the currenciy's validity.
		 * 
		 * @param validFrom
		 *            the start UTC timestamp
		 * @return the builder, for chaining
		 */
		public Builder setValidFrom(Long validFrom) {
			this.validFrom = validFrom;
			return this;
		}

		/**
		 * Sets the end UTC timestamp for the currenciy's validity.
		 * 
		 * @param validUntil
		 *            the ending UTC timestamp
		 * @return the builder, for chaining
		 */
		public Builder setValidUntil(Long validUntil) {
			this.validUntil = validUntil;
			return this;
		}

		/**
		 * Sets the legal tender attribute.
		 * 
		 * @param legalTender
		 *            true, if the currency is a legal tender
		 * @return the builder, for chaining
		 */
		public Builder setLegalTender(boolean legalTender) {
			this.legalTender = legalTender;
			return this;
		}

		/**
		 * Sets the virtual attribute.
		 * 
		 * @param virtual
		 *            true, if the currency is a virtual currency.
		 * @return the builder, for chaining
		 */
		public Builder setVirtual(boolean virtual) {
			this.virtual = virtual;
			return this;
		}

		/**
		 * Get the current namespace attribute set.
		 * 
		 * @return the namespace value, or null.
		 */
		public String getNamespace() {
			return this.namespace;
		}

		/**
		 * Get the current currency code attribute set.
		 * 
		 * @return the currency code value, or null.
		 */
		public String getCurrencyCode() {
			return this.currencyCode;
		}

		/**
		 * Get the current fraction digits attribute set.
		 * 
		 * @return the currency fraction digits value.
		 */
		public int getDefaultFractionDigits() {
			return this.defaultFractionDigits;
		}

		/**
		 * Get the current numeric code attribute set.
		 * 
		 * @return the numeric code value.
		 */
		public int getNumericCode() {
			return this.numericCode;
		}

		/**
		 * Get the starting validity period timestamp.
		 * 
		 * @return the starting validity period tiemstamp, or null..
		 */
		public Long getValidFrom() {
			return this.validFrom;
		}

		/**
		 * Get the ending validity period timestamp.
		 * 
		 * @return the ending validity period tiemstamp, or null..
		 */
		public Long getValidUntil() {
			return this.validUntil;
		}

		/**
		 * Access the legal tender attribute.
		 * 
		 * @return the attribute value.
		 */
		public boolean isLegalTender() {
			return this.legalTender;
		}

		/**
		 * Access the virtual attribute.
		 * 
		 * @return the attribute value.
		 */
		public boolean isVirtual() {
			return this.virtual;
		}

		/**
		 * Checks if this {@link Builder} instance can create a
		 * {@link MoneyCurrency}.
		 * 
		 * @see #build()
		 * @return true, if the builder can build.
		 */
		public boolean isBuildable() {
			return namespace != null && currencyCode != null;
		}

		/**
		 * Builds a new currency instance, the instance build is not cached
		 * internally.
		 * 
		 * @see #build(boolean)
		 * @return a new instance of {@link MoneyCurrency}.
		 */
		public MoneyCurrency build() {
			return build(true);
		}

		/**
		 * Builds a new currency instance, which ia additinoally stored to the
		 * internal cache for reuse.
		 * 
		 * @param cache
		 *            flag to optionally store the instance created into the
		 *            locale cache.
		 * @return a new instance of {@link MoneyCurrency}.
		 */
		public MoneyCurrency build(boolean cache) {
			if (!isBuildable()) {
				throw new IllegalStateException(
						"Can not build CurrencyUnitImpl.");
			}
			if (cache) {
				if (validUntil != null) {
					LOGGER.warning("CurrencyUnit build: Can only cache currencies that have no validity constraints.");
					cache = false;
				}
				if (validFrom != null) {
					if (validFrom.longValue() > System.currentTimeMillis()) {
						LOGGER.warning("CurrencyUnit build: Can only cache currencies that are already valid.");
						cache = false;
					}
				}
			}
			if (cache) {
				String key = namespace + ':' + currencyCode;
				MoneyCurrency current = CACHED.get(key);
				if (current == null) {
					current = new MoneyCurrency(namespace, currencyCode,
							numericCode, defaultFractionDigits, validFrom,
							validUntil, legalTender, virtual);
					CACHED.put(key, current);
				}
				return current;
			}
			return new MoneyCurrency(namespace, currencyCode, numericCode,
					defaultFractionDigits, validFrom, validUntil, legalTender,
					virtual);
		}
	}

	/**
	 * Adapter that implements the new {@link CurrencyUnit} interface using the
	 * JDK's {@link Currency}.
	 * <p>
	 * This adapter will be removed in the final platform implementation.
	 * 
	 * @author Anatole Tresch
	 * @author Werner Keil
	 */
	private final static class JDKCurrencyAdapter extends MoneyCurrency
			implements Localizable {

		/**
		 * serialVersionUID.
		 */
		private static final long serialVersionUID = -2523936311372374236L;

		/**
		 * ISO 4217 currency code for this currency.
		 * 
		 * @serial
		 */
		private final Currency currency;

		/**
		 * Private constructor.
		 * 
		 * @param currency
		 */
		private JDKCurrencyAdapter(Currency currency) {
			super(currency);
			this.currency = currency;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#toString()
		 */
		
		public String toString() {
			return ISO_NAMESPACE + ':' + getCurrencyCode();
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see Localizable#getDisplayName(java.util.Locale)
		 */
		public String getDisplayName(Locale locale) {
			//return currency.getName(locale, nameStyle, isChoiceFormat) (locale);
			return currency.getName(ULocale.forLocale(locale), LONG_NAME, new boolean[1]);
		}

	}
	
	/**
	 * Adapter that implements the new {@link CurrencyUnit} interface using the
	 * JDK's {@link Currency}.
	 * <p>
	 * This adapter will be removed in the final platform implementation.
	 * 
	 * @author Werner Keil
	 */
	private final static class ICUCurrencyAdapter extends MoneyCurrency
			implements Localizable {

		/**
		 * serialVersionUID.
		 */
		private static final long serialVersionUID = -2523936311372374236L;

		/**
		 * ISO 4217 currency code for this currency.
		 * 
		 * @serial
		 */
		private final com.ibm.icu.util.Currency currency;

		/**
		 * Private constructor.
		 * 
		 * @param currency
		 */
		private ICUCurrencyAdapter(com.ibm.icu.util.Currency currency) {
			super(ISO_NAMESPACE, currency.getCurrencyCode(), -1, currency.getDefaultFractionDigits(),
					null, null, true, false);
			this.currency = currency;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#toString()
		 */
		
		public String toString() {
			return ISO_NAMESPACE + ':' + getCurrencyCode();
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see javax.money.Localizable#getDisplayName(java.util.Locale)
		 */
		
		public String getDisplayName(Locale locale) {
			return currency.getName(ULocale.forLocale(locale), LONG_NAME, new boolean[1]);
		}

	}

//	public String getDisplayName(Locale locale) {
//		return getName(ULocale.forLocale(locale), LONG_NAME, new boolean[1]);
//	}
//
//	public int getNumericCode() {
//		return -1;
//	}

}