/* 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.os.Build
import android.text.SpannableStringBuilder
import android.view.ContextThemeWrapper
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.core.view.size
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.google.android.material.chip.Chip
import com.keylesspalace.tusky.R
import com.keylesspalace.tusky.databinding.ItemAnnouncementBinding
import com.keylesspalace.tusky.entity.Announcement
import com.keylesspalace.tusky.interfaces.LinkListener
import com.keylesspalace.tusky.util.BindingHolder
import com.keylesspalace.tusky.util.EmojiSpan
import com.keylesspalace.tusky.util.emojify
import com.keylesspalace.tusky.util.parseAsMastodonHtml
import com.keylesspalace.tusky.util.setClickableText
import com.keylesspalace.tusky.util.visible
import java.lang.ref.WeakReference

interface AnnouncementActionListener : LinkListener {
    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,
    private val wellbeingEnabled: Boolean = false,
    private val animateEmojis: Boolean = false
) : RecyclerView.Adapter<BindingHolder<ItemAnnouncementBinding>>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BindingHolder<ItemAnnouncementBinding> {
        val binding = ItemAnnouncementBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return BindingHolder(binding)
    }

    override fun onBindViewHolder(holder: BindingHolder<ItemAnnouncementBinding>, position: Int) {
        val item = items[position]

        val text = holder.binding.text
        val chips = holder.binding.chipGroup
        val addReactionChip = holder.binding.addReactionChip

        val emojifiedText: CharSequence = item.content.parseAsMastodonHtml().emojify(item.emojis, text, animateEmojis)

        setClickableText(text, emojifiedText, item.mentions, item.tags, listener)

        // If wellbeing mode is enabled, announcement badge counts should not be shown.
        if (wellbeingEnabled) {
            // Since reactions are not visible in wellbeing mode,
            // we shouldn't be able to add any ourselves.
            addReactionChip.visibility = View.GONE
            return
        }

        // hide button if announcement badge limit is already reached
        addReactionChip.visible(item.reactions.size < 8)

        item.reactions.forEachIndexed { i, reaction ->
            (
                chips.getChildAt(i)?.takeUnless { it.id == R.id.addReactionChip } as Chip?
                    ?: Chip(ContextThemeWrapper(chips.context, com.google.android.material.R.style.Widget_MaterialComponents_Chip_Choice)).apply {
                        isCheckable = true
                        checkedIcon = null
                        chips.addView(this, i)
                    }
                )
                .apply {
                    if (reaction.url == null) {
                        this.text = "${reaction.name} ${reaction.count}"
                    } else {
                        // we set the EmojiSpan on a space, because otherwise the Chip won't have the right size
                        // https://github.com/tuskyapp/Tusky/issues/2308
                        val spanBuilder = SpannableStringBuilder("  ${reaction.count}")
                        val span = EmojiSpan(WeakReference(this))
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                            span.contentDescription = reaction.name
                        }
                        spanBuilder.setSpan(span, 0, 1, 0)
                        Glide.with(this)
                            .asDrawable()
                            .load(if (animateEmojis) { reaction.url } else { reaction.staticUrl })
                            .into(span.getTarget(animateEmojis))
                        this.text = spanBuilder
                    }

                    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)
        }
    }

    override fun getItemCount() = items.size

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