metu.life-android/app/src/main/java/com/keylesspalace/tusky/components/announcements/AnnouncementAdapter.kt

/* Copyright 2020 Tusky Contributors
 *
 * This file is a part of Tusky.
 *
 * 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.
 *
 * Tusky 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 Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky.components.announcements

import android.view.ContextThemeWrapper
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.core.view.size
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.chip.Chip
import com.google.android.material.chip.ChipGroup
import com.keylesspalace.tusky.R
import com.keylesspalace.tusky.entity.Announcement
import com.keylesspalace.tusky.entity.Emoji
import com.keylesspalace.tusky.util.emojify
import kotlinx.android.synthetic.main.item_announcement.view.*

interface AnnouncementActionListener {
    fun openReactionPicker(announcementId: String, target: View)
    fun addReaction(announcementId: String, name: String)
    fun removeReaction(announcementId: String, name: String)
}

class AnnouncementAdapter(
        private var items: List<Announcement> = emptyList(),
        private val listener: AnnouncementActionListener
) : RecyclerView.Adapter<AnnouncementAdapter.AnnouncementViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AnnouncementViewHolder {
        val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.item_announcement, parent, false)
        return AnnouncementViewHolder(view)
    }

    override fun onBindViewHolder(viewHolder: AnnouncementViewHolder, position: Int) {
        viewHolder.bind(items[position])
    }

    override fun getItemCount() = items.size

    fun updateList(items: List<Announcement>) {
        this.items = items
        notifyDataSetChanged()
    }

    inner class AnnouncementViewHolder(private val view: View) : RecyclerView.ViewHolder(view) {

        private val text: TextView = view.text
        private val chips: ChipGroup = view.chipGroup
        private val addReactionChip: Chip = view.addReactionChip

        fun bind(item: Announcement) {
            text.text = item.content

            item.reactions.forEachIndexed { i, reaction ->
                (chips.getChildAt(i)?.takeUnless { it.id == R.id.addReactionChip } as Chip?
                        ?: Chip(ContextThemeWrapper(view.context, R.style.Widget_MaterialComponents_Chip_Choice)).apply {
                            isCheckable = true
                            checkedIcon = null
                            chips.addView(this, i)
                        })
                        .apply {
                            val emojiText = if (reaction.url == null) {
                                reaction.name
                            } else {
                                view.context.getString(R.string.emoji_shortcode_format, reaction.name)
                            }
                            text = ("$emojiText ${reaction.count}")
                                    .emojify(
                                            listOf(Emoji(
                                                    reaction.name,
                                                    reaction.url ?: "",
                                                    reaction.staticUrl ?: "",
                                                    null
                                            )),
                                            this
                                    )

                            isChecked = reaction.me

                            setOnClickListener {
                                if (reaction.me) {
                                    listener.removeReaction(item.id, reaction.name)
                                } else {
                                    listener.addReaction(item.id, reaction.name)
                                }
                            }
                        }
            }

            while (chips.size - 1 > item.reactions.size) {
                chips.removeViewAt(item.reactions.size)
            }

            addReactionChip.setOnClickListener {
                listener.openReactionPicker(item.id, it)
            }
        }
    }
}