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package org.glassfish.jersey.message.internal;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import javax.ws.rs.core.AbstractMultivaluedMap;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.RuntimeDelegate;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;

import org.glassfish.jersey.internal.util.collection.ImmutableMultivaluedMap;
import org.glassfish.jersey.internal.util.collection.StringKeyIgnoreCaseMultivaluedMap;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * Utility class supporting the processing of message headers.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public final class HeadersFactory {

    /**
     * Create an empty inbound message headers container. Created container is mutable.
     *
     * @return a new empty mutable container for storing inbound message headers.
     */
    public static AbstractMultivaluedMap createInbound() {
        return new StringKeyIgnoreCaseMultivaluedMap();
    }

    /**
     * Create an inbound message headers container. Created container is mutable
     * and is initialized with the supplied initial collection of headers.
     *
     * @param initial initial collection of headers to be used to initialize the
     *     created message headers container.
     * @return a new mutable container for storing inbound message headers
     *     initialized with the supplied initial collection of headers.
     */
    public static AbstractMultivaluedMap createInbound(MultivaluedMap initial) {
        AbstractMultivaluedMap headers = createInbound();
        headers.putAll(initial);
        return headers;
    }

    /**
     * Create an inbound message headers container. Created container is mutable
     * and is initialized with the supplied initial collection of headers supplied
     * as a {@link Map} of {@code String} keys and {@code List} values.
     *
     * @param initial initial collection of headers to be used to initialize the
     *     created message headers container.
     * @return a new mutable container for storing inbound message headers
     *     initialized with the supplied initial collection of headers.
     */
    public static AbstractMultivaluedMap createInbound(Map> initial) {
        AbstractMultivaluedMap headers = createInbound();
        headers.putAll(initial);
        return headers;
    }

    /**
     * Get immutable empty message headers container. The factory method can be
     * used to for both message header container types  –  inbound
     * as well as outbound.
     *
     * @param  header value type. Typically {@link Object} in case of the outbound
     *     headers and {@link String} in case of the inbound headers.
     * @return an immutable empty message headers container.
     */
    public static  MultivaluedMap empty() {
        return ImmutableMultivaluedMap.empty();
    }

    /**
     * Create an empty outbound message headers container. Created container is mutable.
     *
     * @return a new empty mutable container for storing outbound message headers.
     */
    public static AbstractMultivaluedMap createOutbound() {
        return new StringKeyIgnoreCaseMultivaluedMap();
    }

    /**
     * Create an outbound message headers container. Created container is mutable
     * and is initialized with the supplied initial collection of headers supplied
     * as a {@link Map} of {@code String} keys and {@code List} values.
     *
     * @param initial initial collection of headers to be used to initialize the
     *     created message headers container.
     * @return a new mutable container for storing outbound message headers
     *     initialized with the supplied initial collection of headers.
     */
    public static AbstractMultivaluedMap createOutbound(Map> initial) {
        AbstractMultivaluedMap headers = createOutbound();
        headers.putAll(initial);
        return headers;
    }

    /**
     * Convert a message header value, represented as a general object, to it's
     * string representation.
     * 

     * This method defers to {@link RuntimeDelegate#createHeaderDelegate} to
     * obtain a {@link HeaderDelegate} to convert the value to a {@code String}.
     * If a {@link HeaderDelegate} is not found then the {@code toString()}
     * method on the header object is utilized.
     *
     * @param headerValue the header value represented as an object.
     * @param rd runtime delegate instance to be used for header delegate
     *     retrieval. If {@code null}, a default {@code RuntimeDelegate}
     *     instance will be {@link RuntimeDelegate#getInstance() obtained} and
     *     used.
     * @return the string representation of the supplied header value.
     */
    @SuppressWarnings("unchecked")
    public static String toString(final Object headerValue, RuntimeDelegate rd) {
        if (headerValue instanceof String) {
            return (String) headerValue;
        }
        if (rd == null) {
            rd = RuntimeDelegate.getInstance();
        }

        final HeaderDelegate hp = rd.createHeaderDelegate(headerValue.getClass());
        return (hp != null) ? hp.toString(headerValue) : headerValue.toString();
    }

    public static List toString(final List headerValues, final RuntimeDelegate rd) {
        // Lists#transform returns a list that do not support #add or #set operations so we need to wrap that list to one which
        // supports these operations.
        return new LinkedList(Lists.transform(headerValues, new Function() {

            @Override
            public String apply(Object input) {
                return (input == null) ? "[null]" : HeadersFactory.toString(input, rd);
            }

        }));
    }

    public static MultivaluedMap toString(final MultivaluedMap headers, final RuntimeDelegate rd) {
        return createInbound(Maps.transformValues(headers, new Function, List>() {

            @Override
            public List apply(List input) {
                return (input == null) ? Collections.singletonList("[null]") : HeadersFactory.toString(input, rd);
            }

        }));
    }

    /**
     * Preventing instantiation
     */
    private HeadersFactory() {
    }

    /**
     * Get detached stringified copy of the message headers.
     *
     * @return detached stringified copy of the message headers.
     * @param headers
     */
    public static MultivaluedMap getStringHeaders(MultivaluedMap headers) {
        final MultivaluedMap stringHeaders = createInbound();
        if (!headers.isEmpty()) {
            stringHeaders.putAll(toString(headers, RuntimeDelegate.getInstance()));
        }

        return stringHeaders;
    }
}
 















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