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/*
 * Copyright 2009-2013 Tilmann Zaeschke. All rights reserved.
 * 
 * This file is part of ZooDB.
 * 
 * ZooDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * ZooDB is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with ZooDB.  If not, see .
 * 
 * See the README and COPYING files for further information. 
 */
package org.zoodb.jdo.internal.query;

import java.lang.reflect.Field;

import javax.jdo.JDOFatalInternalException;

import org.zoodb.jdo.internal.DataDeSerializerNoClass;
import org.zoodb.jdo.internal.ZooFieldDef;
import org.zoodb.jdo.internal.query.QueryParser.COMP_OP;

public final class QueryTerm {

	private final COMP_OP op;
	private final String paramName;
	private Object value;
	private QueryParameter param;
	private final ZooFieldDef fieldDef;
	
	public QueryTerm(COMP_OP op, String paramName,
			Object value, ZooFieldDef fieldDef, boolean negate) {
		this.op = op.inverstIfTrue(negate);
		this.paramName = paramName;
		this.value = value;
		this.fieldDef = fieldDef;
	}

	public boolean isParametrized() {
		return paramName != null;
	}

	public String getParamName() {
		return paramName;
	}

	public void setParameter(QueryParameter param) {
		this.param = param;
	}
	
	public QueryParameter getParameter() {
		return param;
	}
	
	public Object getValue() {
		if (paramName != null) {
			return param.getValue();
		}
		return value;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public boolean evaluate(Object o) {
		// we can not cache this, because sub-classes may have different field instances.
		//TODO cache per class? Or reset after query has processed first class set?
		Field f = fieldDef.getJavaField();

		Object oVal;
		try {
			oVal = f.get(o);
		} catch (IllegalArgumentException e) {
			throw new JDOFatalInternalException("Can not access field: " + fieldDef.getName() + 
					" cl=" + o.getClass().getName() + " fcl=" + f.getDeclaringClass().getName(), e);
		} catch (IllegalAccessException e) {
			throw new JDOFatalInternalException("Can not access field: " + fieldDef.getName(), e);
		}
		//TODO avoid indirection and store Parameter value in local _value field !!!!!!!!!!!!!!!!
		Object qVal = getValue();
		if (oVal == null) {
			if (qVal == QueryParser.NULL && (op==COMP_OP.EQ || op==COMP_OP.LE || op==COMP_OP.AE)) {
				return true;
			}
			//ordering of null-value fields is not specified (JDO 3.0 14.6.6: Ordering Statement)
			//We specify:  (null <= 'x' ==true)
			if (qVal != QueryParser.NULL && (op==COMP_OP.NE || op==COMP_OP.LE || op==COMP_OP.L)) {
				return true;
			}
		} else if (qVal != QueryParser.NULL && oVal != null) {
			if (qVal.equals(oVal) && (op==COMP_OP.EQ || op==COMP_OP.LE || op==COMP_OP.AE)) {
				return true;
			}
			if (qVal instanceof Comparable) {
				Comparable qComp = (Comparable) qVal;
				int res = qComp.compareTo(oVal);  //-1:<   0:==  1:> 
				if (res >= 1 && (op == COMP_OP.LE || op==COMP_OP.L || op==COMP_OP.NE)) {
					return true;
				} else if (res <= -1 && (op == COMP_OP.AE || op==COMP_OP.A || op==COMP_OP.NE)) {
					return true;
				}
			}
		} else {
			//here: qVal == QueryParser.NULL && oVal != null
			//Ordering of null-value fields is not specified (JDO 3.0 14.6.6: Ordering Statement)
			//We specify:  (null <= 'x' ==true)
			if (op==COMP_OP.NE || op==COMP_OP.A || op==COMP_OP.AE) {
				return true;
			}
		}
		return false;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public boolean evaluate(DataDeSerializerNoClass dds, long pos) {
		// we can not cache this, because sub-classes may have different field instances.
		//TODO cache per class? Or reset after query has processed first class set?
		Field f = fieldDef.getJavaField();

		Object oVal;
//		try {
			dds.seekPos(pos);
			//TODO this doesn't really work for float/double
			oVal = dds.getAttrAsLong(fieldDef.getDeclaringType(), fieldDef);
//		} catch (IllegalArgumentException e) {
//			throw new JDOFatalInternalException("Can not access field: " + fieldDef.getName() + 
//					" cl=" + fieldDef.getDeclaringType().getClassName() + 
//					" fcl=" + f.getDeclaringClass().getName(), e);
//		}
		//TODO avoid indirection and store Parameter value in local _value field !!!!!!!!!!!!!!!!
		Object qVal = getValue();
		if (oVal == null && qVal == QueryParser.NULL) {
			return true;
		} else if (qVal != QueryParser.NULL && oVal != null) {
			if (qVal.equals(oVal) && (op==COMP_OP.EQ || op==COMP_OP.LE || op==COMP_OP.AE)) {
				return true;
			}
			if (qVal instanceof Comparable) {
				Comparable qComp = (Comparable) qVal;
				int res = qComp.compareTo(oVal);  //-1:<   0:==  1:> 
				if (res == 1 && (op == COMP_OP.LE || op==COMP_OP.L || op==COMP_OP.NE)) {
					return true;
				} else if (res == -1 && (op == COMP_OP.AE || op==COMP_OP.A || op==COMP_OP.NE)) {
					return true;
				}
			}
		}
		return false;
	}

	public String print() {
		StringBuilder sb = new StringBuilder();
		sb.append(fieldDef.getName());
		sb.append(" ");
		sb.append(op);
		sb.append(" ");
		sb.append(value);
		return sb.toString();
	}

	ZooFieldDef getFieldDef() {
		return fieldDef;
	}

	COMP_OP getOp() {
		return op;
	}
	
}