/*
 * Copyright (C) 2016-2020 ActionTech.
 * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
 */

package com.actiontech.dble.plan.common.item;

import com.actiontech.dble.plan.common.field.Field;
import com.actiontech.dble.plan.common.item.num.ItemNum;
import com.actiontech.dble.plan.common.time.MySQLTime;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;

public class ItemDecimal extends ItemNum {
    private BigDecimal value;

    public ItemDecimal(BigDecimal value) {
        this.value = value;
        fixed = true;
        decimals = this.value.scale() > 0 ? this.value.scale() : 0;
    }

    @Override
    public ItemType type() {
        return ItemType.DECIMAL_ITEM;
    }

    @Override
    public FieldTypes fieldType() {
        return FieldTypes.MYSQL_TYPE_NEWDECIMAL;
    }

    @Override
    public BigDecimal valReal() {
        return value;
    }

    @Override
    public BigInteger valInt() {
        return value.toBigInteger();
    }

    @Override
    public BigDecimal valDecimal() {
        return value;
    }

    @Override
    public String valStr() {
        return value.toString();
    }

    @Override
    public boolean getDate(MySQLTime ltime, long fuzzydate) {
        return getDateFromReal(ltime, fuzzydate);
    }

    @Override
    public boolean getTime(MySQLTime ltime) {
        return getTimeFromReal(ltime);
    }

    @Override
    public ItemNum neg() {
        value = value.negate();
        return this;
    }

    @Override
    public int hashCode() {
        if (value == null)
            return 0;
        else
            return value.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (!(obj instanceof ItemDecimal))
            return false;
        ItemDecimal other = (ItemDecimal) obj;
        if (value == null || other.value == null)
            return value == null && other.value == null;
        else
            return value.equals(other.value);
    }

    @Override
    public SQLExpr toExpression() {
        return new SQLNumberExpr(value);
    }

    @Override
    protected Item cloneStruct(boolean forCalculate, List<Item> calArgs, boolean isPushDown, List<Field> fields) {
        return new ItemDecimal(value);
    }
}