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 * person obtaining a copy of this software, associated documentation and/or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.dsl.processor;

import com.oracle.truffle.dsl.processor.java.ElementUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic.Kind;

public class ExpectError {

    private static final String[] EXPECT_ERROR_TYPES = new String[]{TruffleTypes.EXPECT_ERROR_CLASS_NAME1, TruffleTypes.EXPECT_ERROR_CLASS_NAME2};

    public static void assertNoErrorExpected(ProcessingEnvironment processingEnv, Element element) {
        for (String errorType : EXPECT_ERROR_TYPES) {
            assertNoErrorExpectedImpl(processingEnv, element, ElementUtils.getTypeElement(processingEnv, errorType));
        }
    }

    private static void assertNoErrorExpectedImpl(ProcessingEnvironment processingEnv, Element element, TypeElement eee) {
        if (eee != null) {
            for (AnnotationMirror am : element.getAnnotationMirrors()) {
                if (am.getAnnotationType().asElement().equals(eee)) {
                    processingEnv.getMessager().printMessage(Kind.ERROR, "Expected an error, but none found!", element);
                }
            }
        }
    }

    public static boolean isExpectedError(ProcessingEnvironment processingEnv, Element element, String actualText) {
        List<String> expectedErrors = getExpectedErrors(processingEnv, element);
        for (String expectedText : expectedErrors) {
            String newExpectedText = expectedText.replaceAll("%n", System.lineSeparator());
            if (newExpectedText.endsWith("%") && actualText.startsWith(newExpectedText.substring(0, newExpectedText.length() - 1))) {
                return true;
            } else if (actualText.equals(newExpectedText)) {
                return true;
            }
        }
        return false;
    }

    public static List<String> getExpectedErrors(ProcessingEnvironment processingEnv, Element element) {
        if (element == null) {
            return Collections.emptyList();
        }
        List<String> expectedErrors = new ArrayList<>();
        for (String errorType : EXPECT_ERROR_TYPES) {
            collectExpectedErrors(expectedErrors, element, processingEnv.getElementUtils().getTypeElement(errorType));
        }
        return expectedErrors;
    }

    private static void collectExpectedErrors(List<String> expectedErrors, Element element, TypeElement eee) {
        if (eee != null) {
            for (AnnotationMirror am : element.getAnnotationMirrors()) {
                if (am.getAnnotationType().asElement().equals(eee)) {
                    Map<? extends ExecutableElement, ? extends AnnotationValue> vals = am.getElementValues();
                    if (vals.size() == 1) {
                        AnnotationValue av = vals.values().iterator().next();
                        if (av.getValue() instanceof List) {
                            List<?> arr = (List<?>) av.getValue();
                            for (Object o : arr) {
                                if (o instanceof AnnotationValue) {
                                    AnnotationValue ov = (AnnotationValue) o;
                                    expectedErrors.add((String) ov.getValue());
                                }
                            }
                        }
                    }
                }
            }
        }
    }

}