/*
 * 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.apache.fesod.sheet.write.style.column;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.fesod.common.util.MapUtils;
import org.apache.fesod.sheet.enums.CellDataTypeEnum;
import org.apache.fesod.sheet.metadata.Head;
import org.apache.fesod.sheet.metadata.data.WriteCellData;
import org.apache.fesod.sheet.write.metadata.holder.WriteSheetHolder;
import org.apache.poi.ss.usermodel.Cell;

/**
 * Take the width of the longest column as the width.
 * <p>
 * This is not very useful at the moment, for example if you have Numbers it will cause a newline.And the length is not
 * exactly the same as the actual length.
 *
 *
 */
public class LongestMatchColumnWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {

    private static final int MAX_COLUMN_WIDTH = 255;

    private final Map<Integer, Map<Integer, Integer>> cache = MapUtils.newHashMapWithExpectedSize(8);

    @Override
    protected void setColumnWidth(
            WriteSheetHolder writeSheetHolder,
            List<WriteCellData<?>> cellDataList,
            Cell cell,
            Head head,
            Integer relativeRowIndex,
            Boolean isHead) {
        boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
        if (!needSetWidth) {
            return;
        }
        Map<Integer, Integer> maxColumnWidthMap =
                cache.computeIfAbsent(writeSheetHolder.getSheetNo(), key -> new HashMap<>(16));
        Integer columnWidth = dataLength(cellDataList, cell, isHead);
        if (columnWidth < 0) {
            return;
        }
        if (columnWidth > MAX_COLUMN_WIDTH) {
            columnWidth = MAX_COLUMN_WIDTH;
        }
        Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
        if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
            maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
            writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
        }
    }

    private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
        if (isHead) {
            return cell.getStringCellValue().getBytes().length;
        }
        WriteCellData<?> cellData = cellDataList.get(0);
        CellDataTypeEnum type = cellData.getType();
        if (type == null) {
            return -1;
        }
        switch (type) {
            case STRING:
                return cellData.getStringValue().getBytes().length;
            case BOOLEAN:
                return cellData.getBooleanValue().toString().getBytes().length;
            case NUMBER:
                return cellData.getNumberValue().toString().getBytes().length;
            default:
                return -1;
        }
    }
}
