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/*
 * Copyright 2015-2020 Emmanuel Keller
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.qwazr.extractor;

import com.qwazr.utils.StringUtils;
import org.apache.commons.lang3.NotImplementedException;
import org.glassfish.jersey.internal.util.collection.ImmutableMultivaluedMap;
import org.glassfish.jersey.uri.internal.JerseyUriBuilder;

import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.PathSegment;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.core.UriInfo;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class UriInfoImpl implements UriInfo {

    private final URI baseUri;
    private final URI absoluteUri;
    private final URI relativeUri;

    private volatile URI absolutePath;
    private volatile List rawPathSegments;
    private volatile List decodedPathSegments;
    private volatile MultivaluedMap rawParameters;
    private volatile MultivaluedMap decodedParameters;

    public UriInfoImpl(final URI base, final URI child) {
        baseUri = base;
        absoluteUri = child.isAbsolute() ? child : base.resolve(child);
        relativeUri = base.relativize(child);
    }

    public UriInfoImpl(final String base, final String child) throws URISyntaxException {
        this(new URI(base), new URI(child));
    }

    @Override
    public String getPath() {
        return relativeUri.getPath();
    }

    @Override
    public String getPath(boolean decode) {
        return decode ? getPath() : relativeUri.getRawPath();
    }

    @Override
    public synchronized List getPathSegments() {
        if (decodedPathSegments == null)
            decodedPathSegments = pathSegments(relativeUri.getPath());
        return decodedPathSegments;
    }

    @Override
    public synchronized List getPathSegments(boolean decode) {
        if (decode)
            return getPathSegments();
        if (rawPathSegments == null)
            rawPathSegments = pathSegments(relativeUri.getRawPath());
        return rawPathSegments;
    }

    @Override
    public URI getRequestUri() {
        return absoluteUri;
    }

    @Override
    public UriBuilder getRequestUriBuilder() {
        return new JerseyUriBuilder().uri(absoluteUri);
    }

    @Override
    public synchronized URI getAbsolutePath() {
        if (absolutePath == null)
            absolutePath = baseUri.resolve(getPath(false));
        return absolutePath;
    }

    @Override
    public UriBuilder getAbsolutePathBuilder() {
        return new JerseyUriBuilder().uri(getAbsolutePath());
    }

    @Override
    public URI getBaseUri() {
        return baseUri;
    }

    @Override
    public UriBuilder getBaseUriBuilder() {
        return new JerseyUriBuilder().uri(baseUri);
    }

    @Override
    public MultivaluedMap getPathParameters() {
        return getPathParameters(true);
    }

    @Override
    public MultivaluedMap getPathParameters(boolean decode) {
        throw new IllegalStateException("Not implemented");
    }

    private final static MultivaluedMap EMPTY =
            new ImmutableMultivaluedMap<>(new MultivaluedHashMap<>());

    private MultivaluedMap queryParameters(final String query) {
        if (query == null)
            return EMPTY;
        final String[] queryParts = StringUtils.split(query, '&');
        final MultivaluedMap multivaluedMap = new MultivaluedHashMap<>();
        for (String queryPart : queryParts) {
            final int sepPos = queryPart.indexOf('=');
            if (sepPos == -1)
                continue;
            final String key = queryPart.substring(0, sepPos);
            final String value = queryPart.substring(sepPos + 1);
            multivaluedMap.add(key, value);
        }
        return multivaluedMap;
    }

    @Override
    public synchronized MultivaluedMap getQueryParameters() {
        if (decodedParameters == null)
            decodedParameters = queryParameters(relativeUri.getQuery());
        return decodedParameters;
    }

    @Override
    public synchronized MultivaluedMap getQueryParameters(boolean decode) {
        if (decode)
            return getQueryParameters();
        if (rawParameters == null)
            rawParameters = queryParameters(relativeUri.getRawQuery());
        return rawParameters;
    }

    @Override
    public List getMatchedURIs() {
        throw new NotImplementedException("Not implemented");
    }

    @Override
    public List getMatchedURIs(boolean decode) {
        throw new NotImplementedException("Not implemented");
    }

    @Override
    public List