/*
 * Copyright (c) 2018, Daniel Gultsch All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.gultsch.common;

import android.net.Uri;
import android.text.Spannable;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import eu.siacs.conversations.utils.XmppUri;
import java.util.List;
import java.util.Objects;

public class Linkify {

    private static final android.text.util.Linkify.MatchFilter MATCH_FILTER =
            (s, start, end) -> isPassAdditionalValidation(s.subSequence(start, end).toString());

    private static boolean isPassAdditionalValidation(final String match) {
        final var scheme = Iterables.getFirst(Splitter.on(':').limit(2).splitToList(match), null);
        if (scheme == null) {
            return false;
        }
        return switch (scheme) {
            case "tel" -> Patterns.URI_TEL.matcher(match).matches();
            case "http", "https" -> Patterns.URI_HTTP.matcher(match).matches();
            case "geo" -> Patterns.URI_GEO.matcher(match).matches();
            case "xmpp" -> new XmppUri(Uri.parse(match)).isValidJid();
            case "web+ap" -> {
                if (Patterns.URI_WEB_AP.matcher(match).matches()) {
                    final var webAp = new MiniUri(match);
                    // TODO once we have fragment support check that there aren't any
                    yield Objects.nonNull(webAp.getAuthority()) && webAp.getParameter().isEmpty();
                } else {
                    yield false;
                }
            }
            default -> true;
        };
    }

    public static void addLinks(final Spannable body) {
        android.text.util.Linkify.addLinks(body, Patterns.URI_GENERIC, null, MATCH_FILTER, null);
    }

    public static List<MiniUri> getLinks(final String body) {
        final var builder = new ImmutableList.Builder<MiniUri>();
        final var matcher = Patterns.URI_GENERIC.matcher(body);
        while (matcher.find()) {
            final var match = matcher.group();
            if (isPassAdditionalValidation(match)) {
                builder.add(new MiniUri(match));
            }
        }
        return builder.build();
    }
}