/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.runtime.core.el.mvel.datatype;

import static java.nio.charset.StandardCharsets.UTF_16;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.mule.mvel2.MVEL.compileExpression;
import static org.mule.runtime.api.metadata.MediaType.JSON;
import static org.mule.runtime.core.el.mvel.MessageVariableResolverFactory.MESSAGE_PAYLOAD;
import static org.mule.runtime.core.el.mvel.MessageVariableResolverFactory.PAYLOAD;
import static org.mule.tck.junit4.matcher.DataTypeMatcher.like;

import org.mule.mvel2.ParserContext;
import org.mule.mvel2.compiler.CompiledExpression;
import org.mule.runtime.api.metadata.DataType;
import org.mule.runtime.core.api.Event;
import org.mule.runtime.core.internal.message.InternalMessage;
import org.mule.runtime.core.el.mvel.MVELExpressionLanguage;
import org.mule.tck.junit4.AbstractMuleContextTestCase;

import java.nio.charset.Charset;

import org.junit.Test;

public class PayloadExpressionDataTypeResolverTestCase extends AbstractMuleContextTestCase {

  public static final Charset CUSTOM_ENCODING = UTF_16;

  private final PayloadExpressionDataTypeResolver dataTypeResolver = new PayloadExpressionDataTypeResolver();

  @Test
  public void returnsPayloadDataType() throws Exception {
    doPayloadDataTypeTest(PAYLOAD);
  }

  @Test
  public void returnsMessagePayloadDataType() throws Exception {
    doPayloadDataTypeTest(MESSAGE_PAYLOAD);
  }

  private void doPayloadDataTypeTest(String expression) throws Exception {
    final DataType expectedDataType = DataType.builder().type(String.class).mediaType(JSON).charset(CUSTOM_ENCODING).build();

    MVELExpressionLanguage expressionLanguage = new MVELExpressionLanguage(muleContext);
    final CompiledExpression compiledExpression =
        (CompiledExpression) compileExpression(expression, new ParserContext(expressionLanguage.getParserConfiguration()));

    Event event = Event.builder(testEvent()).message(InternalMessage.builder(testEvent().getMessage()).payload(TEST_MESSAGE)
        .mediaType(expectedDataType.getMediaType()).build()).build();
    assertThat(dataTypeResolver.resolve(event, compiledExpression), like(String.class, JSON, CUSTOM_ENCODING));
  }
}