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

package io.heckel.ntfy.ui

import android.content.Context
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.ConnectionState
import io.heckel.ntfy.data.Subscription
import io.heckel.ntfy.data.topicShortUrl
import java.text.SimpleDateFormat
import java.util.*


class MainAdapter(private val onClick: (Subscription) -> Unit, private val onLongClick: (Subscription) -> Unit) :
    ListAdapter<Subscription, MainAdapter.SubscriptionViewHolder>(TopicDiffCallback) {
    val selected = mutableSetOf<Long>() // Subscription IDs

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

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

    fun toggleSelection(subscriptionId: Long) {
        if (selected.contains(subscriptionId)) {
            selected.remove(subscriptionId)
        } else {
            selected.add(subscriptionId)
        }
    }

    /* ViewHolder for Topic, takes in the inflated view and the onClick behavior. */
    class SubscriptionViewHolder(itemView: View, private val selected: Set<Long>, val onClick: (Subscription) -> Unit, val onLongClick: (Subscription) -> Unit) :
        RecyclerView.ViewHolder(itemView) {
        private var subscription: Subscription? = null
        private val context: Context = itemView.context
        private val nameView: TextView = itemView.findViewById(R.id.main_item_text)
        private val statusView: TextView = itemView.findViewById(R.id.main_item_status)
        private val dateView: TextView = itemView.findViewById(R.id.main_item_date)
        private val instantImageView: View = itemView.findViewById(R.id.main_item_instant_image)
        private val newItemsView: TextView = itemView.findViewById(R.id.main_item_new)

        fun bind(subscription: Subscription) {
            this.subscription = subscription
            var statusMessage = if (subscription.totalCount == 1) {
                context.getString(R.string.main_item_status_text_one, subscription.totalCount)
            } else {
                context.getString(R.string.main_item_status_text_not_one, subscription.totalCount)
            }
            if (subscription.instant && subscription.state == ConnectionState.RECONNECTING) {
                statusMessage += ", " + context.getString(R.string.main_item_status_reconnecting)
            }
            val dateText = if (subscription.lastActive == 0L) {
                ""
            } else if (System.currentTimeMillis()/1000 - subscription.lastActive < 24 * 60 * 60) {
                SimpleDateFormat("HH:mm").format(Date(subscription.lastActive*1000))
            } else {
                SimpleDateFormat("M/d/yy").format(Date(subscription.lastActive*1000))
            }
            nameView.text = topicShortUrl(subscription.baseUrl, subscription.topic)
            statusView.text = statusMessage
            dateView.text = dateText
            if (subscription.instant) {
                instantImageView.visibility = View.VISIBLE
            } else {
                instantImageView.visibility = View.GONE
            }
            if (subscription.newCount > 0) {
                newItemsView.visibility = View.VISIBLE
                newItemsView.text = if (subscription.newCount <= 99) subscription.newCount.toString() else "99+"
            } else {
                newItemsView.visibility = View.GONE
            }
            itemView.setOnClickListener { onClick(subscription) }
            itemView.setOnLongClickListener { onLongClick(subscription); true }
            if (selected.contains(subscription.id)) {
                itemView.setBackgroundResource(R.color.primarySelectedRowColor);
            }
        }
    }

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

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