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/*
 * Copyright The WildFly Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package org.jboss.as.ee.component;

import org.jboss.as.ee.logging.EeLogger;
import org.jboss.as.naming.ImmediateManagedReference;
import org.jboss.as.naming.ManagedReference;
import org.jboss.as.naming.ManagedReferenceFactory;
import org.jboss.as.naming.deployment.ContextNames;
import org.jboss.as.server.deployment.DeploymentPhaseContext;
import org.jboss.msc.inject.Injector;
import org.jboss.msc.service.ServiceBuilder;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 * A binding which gets its value from another JNDI binding.
 *
 * @author David M. Lloyd
 */
public final class LookupInjectionSource extends InjectionSource {

    private static final String SLASH = "/";

    // the schemes of supported URLs
    private static final Set URL_SCHEMES;

    static {
        Set set = new HashSet();
        set.add("http");
        set.add("https");
        set.add("ftp");
        set.add("file");
        set.add("jar");
        URL_SCHEMES = Collections.unmodifiableSet(set);
    }

    private final String lookupName;
    private final boolean optional;

    public LookupInjectionSource(final String lookupName) {
        this(lookupName,false);
    }

    public LookupInjectionSource(final String lookupName, final boolean optional) {
        if (lookupName == null) {
            throw EeLogger.ROOT_LOGGER.nullVar("lookupName");
        }
        this.lookupName = lookupName;
        this.optional = optional;
    }

    /**
     * {@inheritDoc}
     */
    public void getResourceValue(final ResolutionContext resolutionContext, final ServiceBuilder serviceBuilder, final DeploymentPhaseContext phaseContext, final Injector injector) {
        final String applicationName = resolutionContext.getApplicationName();
        final String moduleName = resolutionContext.getModuleName();
        final String componentName = resolutionContext.getComponentName();
        final boolean compUsesModule = resolutionContext.isCompUsesModule();
        final String scheme = org.jboss.as.naming.InitialContext.getURLScheme(lookupName);
        if (scheme == null) {
            String sanitizedLookupName = sanitizeLookupName(lookupName);

            // relative name, build absolute name and setup normal lookup injection
            if (componentName != null && !compUsesModule) {
                ContextNames.bindInfoFor(applicationName, moduleName, componentName, "java:comp/env/" + sanitizedLookupName)
                        .setupLookupInjection(serviceBuilder, injector, phaseContext.getDeploymentUnit(), optional);
            } else if (compUsesModule) {
                ContextNames.bindInfoFor(applicationName, moduleName, componentName, "java:module/env/" + sanitizedLookupName)
                        .setupLookupInjection(serviceBuilder, injector, phaseContext.getDeploymentUnit(), optional);
            } else {
                ContextNames.bindInfoFor(applicationName, moduleName, componentName, "java:jboss/env/" + sanitizedLookupName)
                        .setupLookupInjection(serviceBuilder, injector, phaseContext.getDeploymentUnit(), optional);
            }
        } else {
            if (scheme.equals("java")) {
                // an absolute java name, setup normal lookup injection
                if (compUsesModule && lookupName.startsWith("java:comp/")) {
                    // switch "comp" with "module"
                    ContextNames.bindInfoFor(applicationName, moduleName, componentName, "java:module/" + lookupName.substring(10))
                            .setupLookupInjection(serviceBuilder, injector, phaseContext.getDeploymentUnit(), optional);
                } else {
                    ContextNames.bindInfoFor(applicationName, moduleName, componentName, lookupName)
                            .setupLookupInjection(serviceBuilder, injector, phaseContext.getDeploymentUnit(), optional);
                }
            } else {
                // an absolute non java name
                final ManagedReferenceFactory managedReferenceFactory;
                if (URL_SCHEMES.contains(scheme)) {
                    // a Jakarta EE Standard Resource Manager Connection Factory for URLs, using lookup to define value of URL, inject factory that creates URL instances
                    managedReferenceFactory = new ManagedReferenceFactory() {
                        @Override
                        public ManagedReference getReference() {
                            try {
                                return new ImmediateManagedReference(new URL(lookupName));
                            } catch (MalformedURLException e) {
                                throw new RuntimeException(e);
                            }
                        }
                    };
                } else {
                    // lookup for a non java jndi resource, inject factory which does a true jndi lookup
                    managedReferenceFactory = new ManagedReferenceFactory() {
                        @Override
                        public ManagedReference getReference() {
                            try {
                                return new ImmediateManagedReference(new InitialContext().lookup(lookupName));
                            } catch (NamingException e) {
                                EeLogger.ROOT_LOGGER.tracef(e, "failed to lookup %s", lookupName);
                                return null;
                            }
                        }
                    };
                }
                injector.inject(managedReferenceFactory);
            }
        }
    }

    private String sanitizeLookupName(String lookupName) {
        int slashIndex = lookupName.indexOf(SLASH);

        if (slashIndex == 0) {
            EeLogger.ROOT_LOGGER.invalidNamePrefix(lookupName);
            return lookupName.substring(1);
        }
        return lookupName;
    }

    public boolean equals(Object configuration) {
        if (configuration instanceof LookupInjectionSource) {
            LookupInjectionSource lookup = (LookupInjectionSource) configuration;
            return lookupName.equals(lookup.lookupName);
        }
        return false;
    }

    public int hashCode() {
        return lookupName.hashCode();
    }

    public String toString() {
        return "lookup (" + lookupName + ")";
    }

}