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package com.alibaba.excel.util;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.converters.ConverterKeyBuild;
import com.alibaba.excel.converters.ConverterKeyBuild.ConverterKey;
import com.alibaba.excel.converters.NullableObjectConverter;
import com.alibaba.excel.converters.ReadConverterContext;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.exception.ExcelDataConvertException;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.ReadCellData;
import com.alibaba.excel.metadata.property.ExcelContentProperty;
import com.alibaba.excel.read.metadata.holder.ReadSheetHolder;

/**
 * Converting objects
 *
 * @author Jiaju Zhuang
 **/
public class ConverterUtils {
    public static Class defaultClassGeneric = String.class;

    private ConverterUtils() {}

    /**
     * Convert it into a String map
     *
     * @param cellDataMap
     * @param context
     * @return
     */
    public static Map convertToStringMap(Map> cellDataMap,
        AnalysisContext context) {
        Map stringMap = MapUtils.newHashMapWithExpectedSize(cellDataMap.size());
        ReadSheetHolder readSheetHolder = context.readSheetHolder();
        int index = 0;
        for (Map.Entry> entry : cellDataMap.entrySet()) {
            Integer key = entry.getKey();
            ReadCellData cellData = entry.getValue();
            while (index < key) {
                stringMap.put(index, null);
                index++;
            }
            index++;
            if (cellData.getType() == CellDataTypeEnum.EMPTY) {
                stringMap.put(key, null);
                continue;
            }
            Converter converter =
                readSheetHolder.converterMap().get(ConverterKeyBuild.buildKey(String.class, cellData.getType()));
            if (converter == null) {
                throw new ExcelDataConvertException(context.readRowHolder().getRowIndex(), key, cellData, null,
                    "Converter not found, convert " + cellData.getType() + " to String");
            }
            try {
                stringMap.put(key,
                    (String)(converter.convertToJavaData(new ReadConverterContext<>(cellData, null, context))));
            } catch (Exception e) {
                throw new ExcelDataConvertException(context.readRowHolder().getRowIndex(), key, cellData, null,
                    "Convert data " + cellData + " to String error ", e);
            }
        }
        return stringMap;
    }

    /**
     * Convert it into a Java object
     *
     * @param cellData
     * @param field
     * @param contentProperty
     * @param converterMap
     * @param context
     * @param rowIndex
     * @param columnIndex
     * @return
     */
    public static Object convertToJavaObject(ReadCellData cellData, Field field,
        ExcelContentProperty contentProperty, Map> converterMap, AnalysisContext context,
        Integer rowIndex, Integer columnIndex) {
        Class clazz;
        if (field == null) {
            clazz = String.class;
        } else {
            clazz = field.getType();
        }
        if (clazz == CellData.class || clazz == ReadCellData.class) {
            Class classGeneric = getClassGeneric(field.getGenericType());
            ReadCellData