/**
 * TheCitadelofRicks
 *
 * Copyright 2019-2020  <seil0@mosad.xyz>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

package org.mosad.thecitadelofricks.hsoparser

import org.jsoup.Jsoup
import org.jsoup.nodes.Element
import org.mosad.thecitadelofricks.Course
import org.mosad.thecitadelofricks.Room
import org.slf4j.LoggerFactory
import java.net.SocketTimeoutException

sealed class TimetableLinkListParser<T> {

    private var logger: org.slf4j.Logger = LoggerFactory.getLogger(TimetableLinkListParser::class.java)

    abstract fun constructValue(key: String, link: String): T

    abstract val blacklist: List<String>

    abstract val liClass: String

    /**
     * return a list of all elements at listURL
     * @param listURL the url to the list page
     * @return a ArrayList<T> with all links or null if the request was not successful
     */
    fun getLinks(listURL: String): HashMap<String, T>? {
        val linkList = HashMap<String, T>()
        try {
            val courseHTML = Jsoup.connect(listURL).get()

            courseHTML
                .select("ul.index-group")
                .select("li.$liClass")
                .select("a[href]")
                .filter{ it: Element -> !blacklist.contains(it.text()) }
                .forEach {
                    linkList[it.text()] = constructValue(
                        it.text(),
                        it.attr("href").replace("http:", "https:")
                    )
                }
            logger.info("successfully retrieved link List")
        } catch (ex: SocketTimeoutException) {
            logger.warn("timeout from hs-offenburg.de, updating on next attempt!")
            return null
        } catch (gex: Exception) {
            logger.error("general TimetableLinkListParser error", gex)
            return null
        }

        return linkList
    }
}

class CourseListParser : TimetableLinkListParser<Course>() {
    override fun constructValue(key: String, link: String) = Course(key, link)
    override val blacklist = emptyList<String>()
    override val liClass = "Class"
}

class RoomListParser : TimetableLinkListParser<Room>() {
    override fun constructValue(key: String, link: String) = Room(key, link)
    override val blacklist = listOf("STÜBER SYSTEMS")
    override val liClass = "Room"
}