/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * Licensed 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 com.bstek.ureport.expression.model.expr.set;

import com.bstek.ureport.Utils;
import com.bstek.ureport.build.Context;
import com.bstek.ureport.exception.ReportComputeException;
import com.bstek.ureport.expression.model.data.ExpressionData;
import com.bstek.ureport.expression.model.data.ObjectExpressionData;
import com.bstek.ureport.expression.model.data.ObjectListExpressionData;
import com.bstek.ureport.expression.model.expr.BaseExpression;
import com.bstek.ureport.model.Cell;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2017年1月1日
 */
public class FromToExpression extends BaseExpression {
    private static final long serialVersionUID = -3250140935488901894L;
    private final BaseExpression fromExpression;
    private final BaseExpression toExpression;

    public FromToExpression(BaseExpression fromExpression, BaseExpression toExpression) {
        this.fromExpression = fromExpression;
        this.toExpression = toExpression;
    }

    @Override
    protected ExpressionData<?> compute(Cell cell, Cell currentCell, Context context) {
        Object fromData = fromExpression.execute(cell, currentCell, context);
        Object toData = toExpression.execute(cell, currentCell, context);
        int from = convertFloatData(fromData), to = convertFloatData(toData);
        List<Integer> list = new ArrayList<>();
        for (int i = from; i <= to; i++) {
            list.add(i);
        }
        return new ObjectListExpressionData(list);
    }

    private int convertFloatData(Object data) {
        if (data instanceof ObjectExpressionData) {
            Object obj = ((ObjectExpressionData) data).getData();
            return Utils.toBigDecimal(obj).intValue();
        } else {
            throw new ReportComputeException("Can not convert [" + data + "] to integer.");
        }
    }
}
