/*******************************************************************************
 * 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.definition.Order;
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.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2017年1月21日
 */
public class OrderFunction implements Function {

    @Override
    public Object execute(List<ExpressionData<?>> dataList, Context context, Cell currentCell) {
        if (dataList == null || dataList.size() != 2) {
            throw new ReportComputeException("Function [order] need two parameters");
        }
        boolean result = computeOrder(dataList);
        Order orderData = Order.asc;
        if (!result) {
            orderData = Order.desc;
        }
        final Order order = orderData;
        ExpressionData<?> firstData = dataList.get(0);
        if (firstData instanceof ObjectListExpressionData) {
            ObjectListExpressionData data = (ObjectListExpressionData) firstData;
            List<?> list = data.getData();
            list.sort((Comparator<Object>) (data1, data2) -> doOrder(data1, data2, order));
            return list;
        } else if (firstData instanceof BindDataListExpressionData) {
            BindDataListExpressionData bindDataList = (BindDataListExpressionData) firstData;
            List<BindData> list = bindDataList.getData();
            List<Object> ls = new ArrayList<>();
            for (BindData bindData : list) {
                Object obj = bindData.getValue();
                if (obj != null) {
                    ls.add(obj);
                }
            }
            ls.sort((data1, data2) -> doOrder(data1, data2, order));
            return ls;
        } else {
            return firstData.getData();
        }
    }

    private int doOrder(Object data1, Object data2, Order order) {
        if (data1 == null || data2 == null) {
            return 1;
        }
        if (data1 instanceof Date) {
            Date d1 = (Date) data1;
            Date d2 = (Date) data2;
            if (order.equals(Order.asc)) {
                return d1.compareTo(d2);
            } else {
                return d2.compareTo(d1);
            }
        } else if (data1 instanceof Number) {
            BigDecimal n1 = Utils.toBigDecimal(data1);
            BigDecimal n2 = Utils.toBigDecimal(data2);
            if (order.equals(Order.asc)) {
                return n1.compareTo(n2);
            } else {
                return n2.compareTo(n1);
            }
        } else {
            String str1 = data1.toString();
            String str2 = data2.toString();
            if (order.equals(Order.asc)) {
                return str1.compareTo(str2);
            } else {
                return str2.compareTo(str1);
            }
        }
    }

    private boolean computeOrder(List<ExpressionData<?>> dataList) {
        boolean order = false;
        ExpressionData<?> secondData = dataList.get(1);
        if (secondData instanceof ObjectExpressionData) {
            ObjectExpressionData data = (ObjectExpressionData) secondData;
            Object obj = data.getData();
            if (obj == null) {
                throw new ReportComputeException("Function [order] second parameter can not be null");
            }
            if (obj instanceof Boolean) {
                order = (Boolean) obj;
                return order;
            }
            if (obj instanceof String) {
                order = Boolean.parseBoolean(obj.toString());
            } else {
                throw new ReportComputeException("Function [order] second parameter muse be boolean type.");
            }
        }
        return order;
    }

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