package com.aionemu.commons.configuration;

import java.io.File;
import java.net.InetSocketAddress;
import java.time.ZoneId;
import java.util.Collection;
import java.util.TimeZone;
import java.util.regex.Pattern;

import org.quartz.CronExpression;

import com.aionemu.commons.configuration.transformers.ArrayTransformer;
import com.aionemu.commons.configuration.transformers.BooleanTransformer;
import com.aionemu.commons.configuration.transformers.CharTransformer;
import com.aionemu.commons.configuration.transformers.ClassTransformer;
import com.aionemu.commons.configuration.transformers.CollectionTransformer;
import com.aionemu.commons.configuration.transformers.CronExpressionTransformer;
import com.aionemu.commons.configuration.transformers.EnumTransformer;
import com.aionemu.commons.configuration.transformers.FileTransformer;
import com.aionemu.commons.configuration.transformers.InetSocketAddressTransformer;
import com.aionemu.commons.configuration.transformers.NumberTransformer;
import com.aionemu.commons.configuration.transformers.PatternTransformer;
import com.aionemu.commons.configuration.transformers.PropertyTransformer;
import com.aionemu.commons.configuration.transformers.StringTransformer;
import com.aionemu.commons.configuration.transformers.TimeZoneTransformer;
import com.aionemu.commons.configuration.transformers.ZoneIdTransformer;

/**
 * This class is responsible for creating property transformers. Uses shared instances to avoid overhead.
 * 
 * @author SoulKeeper, Neon
 */
public class PropertyTransformerFactory {

	/**
	 * @param targetType
	 *          The value type that strings should be transformed into.
	 * @return A shared instance of the {@link PropertyTransformer} that can transform strings into given targetType.
	 * @throws IllegalArgumentException
	 *           If there's no transformer for given target class.
	 */
	@SuppressWarnings("unchecked")
	public static <T> PropertyTransformer<T> getTransformer(Class<T> targetType) {
		if (Number.class.isAssignableFrom(NumberTransformer.toWrapper(targetType)))
			return (PropertyTransformer<T>) NumberTransformer.SHARED_INSTANCE;
		if (targetType == Boolean.class || targetType == Boolean.TYPE)
			return (PropertyTransformer<T>) BooleanTransformer.SHARED_INSTANCE;
		if (targetType == Character.class || targetType == Character.TYPE)
			return (PropertyTransformer<T>) CharTransformer.SHARED_INSTANCE;
		if (targetType == String.class)
			return (PropertyTransformer<T>) StringTransformer.SHARED_INSTANCE;
		if (targetType.isEnum())
			return (PropertyTransformer<T>) EnumTransformer.SHARED_INSTANCE;
		if (Collection.class.isAssignableFrom(targetType))
			return (PropertyTransformer<T>) CollectionTransformer.SHARED_INSTANCE;
		if (targetType.isArray())
			return (PropertyTransformer<T>) ArrayTransformer.SHARED_INSTANCE;
		if (targetType == File.class)
			return (PropertyTransformer<T>) FileTransformer.SHARED_INSTANCE;
		if (InetSocketAddress.class.isAssignableFrom(targetType))
			return (PropertyTransformer<T>) InetSocketAddressTransformer.SHARED_INSTANCE;
		if (targetType == Pattern.class)
			return (PropertyTransformer<T>) PatternTransformer.SHARED_INSTANCE;
		if (targetType == Class.class)
			return (PropertyTransformer<T>) ClassTransformer.SHARED_INSTANCE;
		if (TimeZone.class.isAssignableFrom(targetType))
			return (PropertyTransformer<T>) TimeZoneTransformer.SHARED_INSTANCE;
		if (ZoneId.class.isAssignableFrom(targetType))
			return (PropertyTransformer<T>) ZoneIdTransformer.SHARED_INSTANCE;
		if (targetType == CronExpression.class)
			return (PropertyTransformer<T>) CronExpressionTransformer.SHARED_INSTANCE;
		throw new IllegalArgumentException("Transformer for " + targetType.getSimpleName() + " is not implemented.");
	}
}