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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2022-2024] Payara Foundation and/or its affiliates. All rights reserved.
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * See the License for the specific
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 *
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 * file and include the License file at glassfish/legal/LICENSE.txt.
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package org.glassfish.concurrent.runtime.deployment.annotation.handlers;

import com.sun.enterprise.config.serverbeans.Domain;
import com.sun.enterprise.deployment.ContextServiceDefinitionDescriptor;
import com.sun.enterprise.deployment.ResourceDescriptor;
import com.sun.enterprise.deployment.annotation.context.ResourceContainerContext;
import jakarta.enterprise.concurrent.ContextServiceDefinition;
import jakarta.inject.Inject;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import org.glassfish.apf.AnnotationHandlerFor;
import org.glassfish.apf.AnnotationInfo;
import org.glassfish.apf.AnnotationProcessorException;
import org.glassfish.apf.HandlerProcessingResult;
import org.glassfish.config.support.TranslatedConfigView;
import org.glassfish.deployment.common.JavaEEResourceType;
import org.jvnet.hk2.annotations.Service;

/**
 * Handler for @ContextServiceDefinition.
 *
 * @author Petr Aubrecht 
 */
@Service
@AnnotationHandlerFor(ContextServiceDefinition.class)
public class ContextServiceDefinitionHandler extends AbstractConcurrencyHandler {

    private static final Logger logger = Logger.getLogger(ContextServiceDefinitionHandler.class.getName());

    @Inject
    private Domain domain;

    @Override
    protected HandlerProcessingResult processAnnotation(AnnotationInfo annotationInfo,
            ResourceContainerContext[] resourceContainerContexts)
            throws AnnotationProcessorException {
        logger.log(Level.INFO, "Entering ContextServiceDefinitionHandler.processAnnotation");
        ContextServiceDefinition contextServiceDefinition = (ContextServiceDefinition) annotationInfo.getAnnotation();

        processSingleAnnotation(contextServiceDefinition, resourceContainerContexts);

        return getDefaultProcessedResult();
    }

    public void processSingleAnnotation(ContextServiceDefinition contextServiceDefinition,
            ResourceContainerContext[] resourceContainerContexts) {
        logger.log(Level.INFO, "Creating custom context service by annotation");
        ContextServiceDefinitionDescriptor csdd = createDescriptor(contextServiceDefinition);

        // add to resource contexts
        for (ResourceContainerContext context : resourceContainerContexts) {
            Set resourceDescriptors = context.getResourceDescriptors(JavaEEResourceType.CSDD);
            if (descriptorAlreadyPresent(resourceDescriptors, csdd)) {
                merge(resourceDescriptors, contextServiceDefinition);
            } else {
                resourceDescriptors.add(csdd);
            }
        }
    }

    public ContextServiceDefinitionDescriptor createDescriptor(ContextServiceDefinition contextServiceDefinition) {
        Set unusedContexts = collectUnusedContexts(contextServiceDefinition);

        ContextServiceDefinitionDescriptor csdd = new ContextServiceDefinitionDescriptor();
        csdd.setDescription("Context Service Definition");
        csdd.setName(TranslatedConfigView.expandValue(contextServiceDefinition.name()));
        csdd.setPropagated(evaluateContexts(contextServiceDefinition.propagated(), unusedContexts));
        csdd.setCleared(evaluateContexts(contextServiceDefinition.cleared(), unusedContexts));
        csdd.setUnchanged(evaluateContexts(contextServiceDefinition.unchanged(), unusedContexts));
        csdd.setQualifiers(Arrays.asList(contextServiceDefinition.qualifiers()).stream().map(c -> c.getName()).collect(Collectors.toSet()));

        return csdd;
    }

    private void merge(Set resourceDescriptors, ContextServiceDefinition csd) {
        for (ResourceDescriptor resource : resourceDescriptors) {
            ContextServiceDefinitionDescriptor descriptor = (ContextServiceDefinitionDescriptor) resource;
            if (descriptor.getName().equals(csd.name())) {

                if (descriptor.getCleared() == null && csd.cleared() != null) {
                    descriptor.setCleared(new HashSet<>(Arrays.asList(csd.cleared())));
                }

                if (descriptor.getPropagated() == null && csd.propagated() != null) {
                    descriptor.setPropagated(new HashSet<>(Arrays.asList(csd.propagated())));
                }

                if (descriptor.getUnchanged() == null && csd.unchanged() != null) {
                    descriptor.setUnchanged(new HashSet<>(Arrays.asList(csd.unchanged())));
                }

                if (descriptor.getQualifiers() == null && csd.qualifiers() != null) {
                    descriptor.setQualifiers(mapToSetOfStrings(csd.qualifiers()));
                }
            }
        }
    }

    private Set evaluateContexts(String[] sourceContexts, Set unusedContexts) {
        Set contexts = new HashSet<>();
        for (String context : sourceContexts) {
            if (ContextServiceDefinition.ALL_REMAINING.equals(context)) {
                contexts.addAll(unusedContexts);
                contexts.add(ContextServiceDefinition.ALL_REMAINING); // keep remaining for custom context providers
            } else {
                contexts.add(context);
            }
        }
        return contexts;
    }

    private Set collectUnusedContexts(ContextServiceDefinition csdd) {
        Map usedContexts = new HashMap<>();
        for (String context : csdd.propagated()) {
            usedContexts.put(context, "propagated");
        }
        for (String context : csdd.cleared()) {
            String previous = usedContexts.put(context, "cleared");
            if (previous != null) {
                throw new RuntimeException("Duplicate context " + context + " in " + previous + " and cleared context attributes in ContextServiceDefinition annotation!");
            }
        }
        for (String context : csdd.unchanged()) {
            String previous = usedContexts.put(context, "unchanged");
            if (previous != null) {
                throw new RuntimeException("Duplicate context " + context + " in " + previous + " and unchanged context attributes in ContextServiceDefinition annotation!");
            }
        }
        Set allStandardContexts = new HashSet(Set.of(
                ContextServiceDefinition.APPLICATION,
                ContextServiceDefinition.SECURITY,
                ContextServiceDefinition.TRANSACTION));
        allStandardContexts.removeAll(usedContexts.keySet());
        return allStandardContexts;
    }
}