/*******************************************************************************
 * 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.function;

import com.bstek.ureport.Utils;
import com.bstek.ureport.build.BindData;
import com.bstek.ureport.build.Context;
import com.bstek.ureport.exception.ReportComputeException;
import com.bstek.ureport.expression.model.data.BindDataListExpressionData;
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.model.Cell;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2017年5月23日
 */
public class FormatNumberFunction implements Function {
    @Override
    public Object execute(List<ExpressionData<?>> dataList, Context context, Cell currentCell) {
        if (dataList == null) {
            return "";
        }
        Object obj = null;
        String pattern = "#";
        if (dataList.size() == 1) {
            obj = buildExpressionData(dataList.get(0));
        } else if (dataList.size() > 1) {
            obj = buildExpressionData(dataList.get(0));
            Object patternData = buildExpressionData(dataList.get(1));
            if (patternData != null) {
                pattern = patternData.toString();
            }
        }

        if (obj == null) {
            throw new ReportComputeException("Function [formatnumber] need a number parameter at least");
        } else {
            BigDecimal bigData = Utils.toBigDecimal(obj);
            DecimalFormat df = new DecimalFormat(pattern);
            return df.format(bigData.doubleValue());
        }
    }

    private Object buildExpressionData(ExpressionData<?> data) {
        if (data instanceof ObjectListExpressionData) {
            ObjectListExpressionData listExpressionData = (ObjectListExpressionData) data;
            List<?> list = listExpressionData.getData();
            if (list.size() > 0) {
                return list.get(0);
            }
        } else if (data instanceof ObjectExpressionData) {
            return ((ObjectExpressionData) data).getData();
        } else if (data instanceof BindDataListExpressionData) {
            BindDataListExpressionData bindDataList = (BindDataListExpressionData) data;
            List<BindData> list = bindDataList.getData();
            if (list.size() > 0) {
                return list.get(0).getValue();
            }
        }
        return null;
    }

    @Override
    public String name() {
        return "formatnumber";
    }
}
