e-ntfy-android/app/src/main/java/io/heckel/ntfy/ui/DetailAdapter.kt

package io.heckel.ntfy.ui

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import io.heckel.ntfy.R
import io.heckel.ntfy.data.Notification
import java.util.*

class DetailAdapter(private val onClick: (Notification) -> Unit, private val onLongClick: (Notification) -> Unit) :
    ListAdapter<Notification, DetailAdapter.DetailViewHolder>(TopicDiffCallback) {
    val selected = mutableSetOf<String>() // Notification IDs

    /* Creates and inflates view and return TopicViewHolder. */
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DetailViewHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.detail_fragment_item, parent, false)
        return DetailViewHolder(view, selected, onClick, onLongClick)
    }

    /* Gets current topic and uses it to bind view. */
    override fun onBindViewHolder(holder: DetailViewHolder, position: Int) {
        holder.bind(getItem(position))
    }

    fun toggleSelection(notificationId: String) {
        if (selected.contains(notificationId)) {
            selected.remove(notificationId)
        } else {
            selected.add(notificationId)
        }
    }

    /* ViewHolder for Topic, takes in the inflated view and the onClick behavior. */
    class DetailViewHolder(itemView: View, private val selected: Set<String>, val onClick: (Notification) -> Unit, val onLongClick: (Notification) -> Unit) :
        RecyclerView.ViewHolder(itemView) {
        private var notification: Notification? = null
        private val dateView: TextView = itemView.findViewById(R.id.detail_item_date_text)
        private val messageView: TextView = itemView.findViewById(R.id.detail_item_message_text)

        fun bind(notification: Notification) {
            this.notification = notification
            dateView.text = Date(notification.timestamp * 1000).toString()
            messageView.text = notification.message
            itemView.setOnClickListener { onClick(notification) }
            itemView.setOnLongClickListener { onLongClick(notification); true }
            if (selected.contains(notification.id)) {
                itemView.setBackgroundResource(R.color.primarySelectedRowColor);
            }
        }
    }

    object TopicDiffCallback : DiffUtil.ItemCallback<Notification>() {
        override fun areItemsTheSame(oldItem: Notification, newItem: Notification): Boolean {
            return oldItem.id == newItem.id
        }

        override fun areContentsTheSame(oldItem: Notification, newItem: Notification): Boolean {
            return oldItem == newItem
        }
    }
}