<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="jakarta.tags.core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Kalkulator w JSP</title>
<link rel="stylesheet" type="text/css" href="styl.css">
</head>
<body>
<h1>Kalkulator w JSP</h1>

<form class="kalkulator" method="post">
<input type="number" name="arg1" value="${param.arg1}">

<select name="operacja">
<c:forEach var="op" items="+,-,*,/">
	<c:choose>
	<c:when test="${op == param.operacja}">
		<option value="${op}" selected="selected">${op}</option>
	</c:when>
	<c:otherwise>
		<option value="${op}">${op}</option>
	</c:otherwise>
	</c:choose>
</c:forEach>
</select>

<input type="number" name="arg2" value="${param.arg2}">
<button style="color:red;font-weight:bold">Oblicz</button>
</form>


<jsp:useBean id="kalkulatorBean" class="kalkulator.KalkulatorBean"/>
<jsp:setProperty name="kalkulatorBean" property="arg1" param="arg1"/>
<jsp:setProperty name="kalkulatorBean" property="arg2" param="arg2"/>
<jsp:setProperty name="kalkulatorBean" property="operacja" param="operacja"/>

<c:if test="${not empty param.operacja}">
<div class="wynik">
${kalkulatorBean.arg1} ${kalkulatorBean.operacja} ${kalkulatorBean.arg2} =
	<strong>${kalkulatorBean.wynik}</strong>
 </div>
</c:if>

</body>
</html>