/*

 * Geekttrss is a RSS feed reader application on the Android Platform.

 *

 * Copyright (C) 2017-2019 by Frederic-Charles Barthelery.

 *

 * This file is part of Geekttrss.

 *

 * Geekttrss is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * Geekttrss is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with Geekttrss.  If not, see <http://www.gnu.org/licenses/>.

 */

package com.geekorum.favikonsnoop.snoopers

import com.geekorum.favikonsnoop.FaviconInfo

import com.geekorum.favikonsnoop.Snooper

import org.jsoup.Jsoup

import java.io.InputStream

open class LinkRelSnooper(

    private val relValue: String

) : Snooper() {

    override fun snoop(baseUrl: String, content: InputStream): Collection<FaviconInfo> {

        val document = Jsoup.parse(content, null, baseUrl)

        return document.head()?.let { head ->

            head.getElementsByTag("link")

                .filter {

                    relValue in it.attr("rel").split("\\s".toRegex())

                }

                .flatMap {

                    val url = it.attr("abs:href")

                    val type = it.attr("type").ifEmpty { null }

                            )

                    }

                }

        } ?: emptyList()

    }

}