Twidere-App-Android-Twitter-Mastodon/twidere/src/main/kotlin/org/mariotaku/twidere/loader/users/StatusFavoritersLoader.kt

/*
 *             Twidere - Twitter client for Android
 *
 *  Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 *  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, see <http://www.gnu.org/licenses/>.
 */

package org.mariotaku.twidere.loader.users

import android.content.Context
import org.attoparser.config.ParseConfiguration
import org.attoparser.simple.AbstractSimpleMarkupHandler
import org.attoparser.simple.SimpleMarkupParser
import org.mariotaku.microblog.library.MicroBlog
import org.mariotaku.microblog.library.MicroBlogException
import org.mariotaku.microblog.library.mastodon.Mastodon
import org.mariotaku.microblog.library.twitter.TwitterWeb
import org.mariotaku.microblog.library.twitter.model.IDs
import org.mariotaku.microblog.library.twitter.model.IDsAccessor
import org.mariotaku.microblog.library.twitter.model.Paging
import org.mariotaku.twidere.annotation.AccountType
import org.mariotaku.twidere.exception.APINotSupportedException
import org.mariotaku.twidere.extension.api.lookupUsersMapPaginated
import org.mariotaku.twidere.extension.model.api.mastodon.mapToPaginated
import org.mariotaku.twidere.extension.model.api.mastodon.toParcelable
import org.mariotaku.twidere.extension.model.api.toParcelable
import org.mariotaku.twidere.extension.model.isOfficial
import org.mariotaku.twidere.extension.model.newMicroBlogInstance
import org.mariotaku.twidere.model.AccountDetails
import org.mariotaku.twidere.model.ParcelableUser
import org.mariotaku.twidere.model.UserKey
import org.mariotaku.twidere.model.pagination.PaginatedList
import java.text.ParseException

class StatusFavoritersLoader(
        context: Context,
        accountKey: UserKey,
        private val statusId: String,
        data: List<ParcelableUser>?,
        fromUser: Boolean
) : AbsRequestUsersLoader(context, accountKey, data, fromUser) {

    @Throws(MicroBlogException::class)
    override fun getUsers(details: AccountDetails, paging: Paging): PaginatedList<ParcelableUser> {
        when (details.type) {
            AccountType.MASTODON -> {
                val mastodon = details.newMicroBlogInstance(context, Mastodon::class.java)
                return mastodon.getStatusFavouritedBy(statusId).mapToPaginated {
                    it.toParcelable(details)
                }
            }
            AccountType.TWITTER -> {
                val microBlog = details.newMicroBlogInstance(context, MicroBlog::class.java)
                val ids = if (details.isOfficial(context)) {
                    microBlog.getStatusActivitySummary(statusId).favoriters
                } else {
                    val web = details.newMicroBlogInstance(context, TwitterWeb::class.java)
                    val htmlUsers = web.getFavoritedPopup(statusId).htmlUsers
                    IDsAccessor.setIds(IDs(), parseUserIds(htmlUsers))
                }
                return microBlog.lookupUsersMapPaginated(ids) {
                    it.toParcelable(details, profileImageSize = profileImageSize)
                }
            }
            else -> {
                throw APINotSupportedException(details.type)
            }
        }
    }

    @Throws(MicroBlogException::class)
    private fun parseUserIds(html: String): Array<String> {
        val parser = SimpleMarkupParser(ParseConfiguration.htmlConfiguration())
        val userIds = ArrayList<String>()
        val handler = object : AbstractSimpleMarkupHandler() {
            override fun handleOpenElement(elementName: String, attributes: Map<String, String>?,
                    line: Int, col: Int) {
                if (elementName == "div" && attributes != null) {
                    if (attributes["class"]?.split(" ")?.contains("account") == true) {
                        attributes["data-user-id"]?.let { userIds.add(it) }
                    }
                }
            }
        }
        try {
            parser.parse(html, handler)
        } catch (e: ParseException) {
            throw MicroBlogException(e)
        }
        if (userIds.isEmpty()) {
            throw MicroBlogException("Invalid response")
        }
        return userIds.distinct().toTypedArray()
    }

}