/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.ofbiz.entity.sql;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.ofbiz.entity.condition.EntityCondition;
import org.ofbiz.entity.condition.EntityFieldValue;
import org.ofbiz.entity.condition.EntityOperator;
import org.ofbiz.sql.BooleanCondition;
import org.ofbiz.sql.Condition;
import org.ofbiz.sql.ConditionList;
import org.ofbiz.sql.ConditionPlanner;
import org.ofbiz.sql.FieldValue;
import org.ofbiz.sql.Joiner;
import org.ofbiz.sql.NumberValue;
import org.ofbiz.sql.ParameterValue;
import org.ofbiz.sql.ParameterizedConditionException;
import org.ofbiz.sql.StringValue;
import org.ofbiz.sql.Value;

public class EntityConditionPlanner implements ConditionPlanner<EntityCondition> {
    public EntityCondition parse(Condition condition, Map<String, ? extends Object> params) throws ParameterizedConditionException {
        if (condition == null) return null;
        if (condition instanceof BooleanCondition) {
            BooleanCondition bc = (BooleanCondition) condition;
            return EntityCondition.makeCondition(buildFieldValue(bc.getLeft()), EntityOperator.lookupComparison(bc.getOp()), buildValue(bc.getRight(), params));
        } else if (condition instanceof ConditionList) {
            ConditionList cl = (ConditionList) condition;
            List<EntityCondition> conditions = new LinkedList<EntityCondition>();
            for (Condition subCondition: cl) {
                conditions.add(parse(subCondition, params));
            }
            return EntityCondition.makeCondition(conditions, cl.getJoiner() == Joiner.AND ? EntityOperator.AND : EntityOperator.OR);
        } else {
            throw new UnsupportedOperationException(condition.toString());
        }
    }

    private static EntityFieldValue buildFieldValue(Value value) {
        if (value instanceof FieldValue) {
            FieldValue fv = (FieldValue) value;
            return EntityFieldValue.makeFieldValue(fv.getFieldName(), fv.getTableName(), null, null);
        }
        throw new UnsupportedOperationException(value.toString());
    }

    private static Object buildValue(Object value, Map<String, ? extends Object> params) throws ParameterizedConditionException {
        if (value instanceof NumberValue<?>) {
            return ((NumberValue<?>) value).getNumber();
        } else if (value instanceof StringValue) {
            return ((StringValue) value).getString();
        } else if (value instanceof FieldValue) {
            FieldValue fv = (FieldValue) value;
            return EntityFieldValue.makeFieldValue(fv.getFieldName(), fv.getTableName(), null, null);
        } else if (value instanceof List<?>) {
            List<Object> values = new LinkedList<Object>();
            for (Object sqlValue: (List<?>) value) {
                values.add(buildValue(sqlValue, params));
            }
            return values;
        } else if (value == Value.NULL) {
            return null;
        } else if (value instanceof ParameterValue) {
            if (params == null) {
                throw new ParameterizedConditionException();
            }
            return params.get(((ParameterValue) value).getName());
        }
        throw new UnsupportedOperationException(value.getClass().getName() + ":" + value.toString());
    }
}