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package com.sun.jersey.server.impl.wadl;

import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.api.model.AbstractResource;
import com.sun.jersey.api.wadl.config.WadlGeneratorConfigLoader;
import com.sun.jersey.core.spi.factory.InjectableProviderFactory;
import com.sun.jersey.server.impl.model.method.ResourceMethod;
import com.sun.jersey.server.impl.uri.PathPattern;
import com.sun.jersey.server.wadl.WadlApplicationContext;
import com.sun.jersey.server.wadl.WadlGenerator;
import com.sun.jersey.spi.inject.SingletonTypeInjectableProvider;

import javax.ws.rs.core.Context;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;

/**
 *
 * @author [email protected]
 */
public final class WadlFactory {

    private static final Logger LOGGER = Logger.getLogger(WadlFactory.class.getName());

    private final boolean isWadlEnabled;

    private final WadlGenerator wadlGenerator;

    private WadlApplicationContext wadlApplicationContext;

    public WadlFactory(ResourceConfig resourceConfig) {
        isWadlEnabled = isWadlEnabled(resourceConfig);

        if (isWadlEnabled) {
            wadlGenerator = WadlGeneratorConfigLoader.loadWadlGeneratorsFromConfig(resourceConfig);
        }
        else {
            wadlGenerator = null;
        }
    }

    public boolean isSupported() {
        return isWadlEnabled;
    }

    public WadlApplicationContext createWadlApplicationContext(Set rootResources) {
        if (!isSupported()) return null;

        return new WadlApplicationContextImpl(rootResources, wadlGenerator);
    }

    public void init(InjectableProviderFactory ipf, Set rootResources) {
        if (!isSupported()) return;

        wadlApplicationContext = new WadlApplicationContextImpl(rootResources, wadlGenerator);

        ipf.add(new SingletonTypeInjectableProvider(
                WadlApplicationContext.class, wadlApplicationContext) {});
    }

    /**
     * Create the WADL resource method for OPTIONS.
     * 
     * This is created using reflection so that there is no runtime
     * dependency on JAXB. If the JAXB jars are not in the class path
     * then WADL generation will not be supported.
     *
     * @param resource the resource model
     * @return the WADL resource OPTIONS method
     */
    public ResourceMethod createWadlOptionsMethod(
            Map> methods,
            AbstractResource resource, PathPattern p) {
        if (!isSupported()) return null;

        if (p == null) {
            return new WadlMethodFactory.WadlOptionsMethod(methods, resource, null, wadlGenerator, wadlApplicationContext);
        } else {
            // Remove the '/' from the beginning
            String path = p.getTemplate().getTemplate().substring(1);
            return new WadlMethodFactory.WadlOptionsMethod(methods, resource, path, wadlGenerator, wadlApplicationContext);
        }
    }

    /**
     * Check if JAXB is present in the class path
     * @return
     *
     * @throws java.lang.ClassNotFoundException
     */
    private static boolean isWadlEnabled(ResourceConfig resourceConfig) {
        return !resourceConfig.getFeature(ResourceConfig.FEATURE_DISABLE_WADL);
    }
}