Add client count badge

mobile/src/main/java/be/mygod/vpnhotspot/client/Client.kt

@@ -0,0 +1,45 @@
+package be.mygod.vpnhotspot.client
+
+import android.support.v7.util.DiffUtil
+import be.mygod.vpnhotspot.App.Companion.app
+import be.mygod.vpnhotspot.R
+import be.mygod.vpnhotspot.net.IpNeighbour
+import be.mygod.vpnhotspot.net.TetherType
+import java.util.*
+
+abstract class Client {
+    companion object : DiffUtil.ItemCallback<Client>() {
+        override fun areItemsTheSame(oldItem: Client, newItem: Client) =
+                oldItem.iface == newItem.iface && oldItem.mac == newItem.mac
+        override fun areContentsTheSame(oldItem: Client, newItem: Client) = oldItem == newItem
+    }
+
+    abstract val iface: String
+    abstract val mac: String
+    val ip = TreeMap<String, IpNeighbour.State>()
+
+    open val icon get() = TetherType.ofInterface(iface).icon
+    val title get() = "$mac%$iface"
+    val description get() = ip.entries.joinToString("\n") { (ip, state) ->
+        app.getString(when (state) {
+            IpNeighbour.State.INCOMPLETE -> R.string.connected_state_incomplete
+            IpNeighbour.State.VALID -> R.string.connected_state_valid
+            IpNeighbour.State.FAILED -> R.string.connected_state_failed
+            else -> throw IllegalStateException("Invalid IpNeighbour.State: $state")
+        }, ip)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Client
+
+        if (iface != other.iface) return false
+        if (mac != other.mac) return false
+        if (ip != other.ip) return false
+
+        return true
+    }
+    override fun hashCode() = Objects.hash(iface, mac, ip)
+}