package com.geeksville.mesh.ui


import android.os.Bundle
import android.text.format.DateFormat
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.core.content.ContextCompat
import androidx.fragment.app.activityViewModels
import androidx.lifecycle.Observer
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.geeksville.android.Logging
import com.geeksville.mesh.NodeInfo
import com.geeksville.mesh.R
import com.geeksville.mesh.model.UIViewModel
import kotlinx.android.synthetic.main.adapter_node_layout.view.*
import kotlinx.android.synthetic.main.nodelist_fragment.*
import java.text.ParseException
import java.util.*


class UsersFragment : ScreenFragment("Users"), Logging {

    private val model: UIViewModel by activityViewModels()

    // Provide a direct reference to each of the views within a data item
    // Used to cache the views within the item layout for fast access
    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val nodeNameView = itemView.nodeNameView
        val distance_view = itemView.distance_view
        val batteryPctView = itemView.batteryPercentageView
        val lastTime = itemView.lastConnectionView
        val powerIcon = itemView.batteryIcon
    }

    private val nodesAdapter = object : RecyclerView.Adapter<ViewHolder>() {

        /**
         * Called when RecyclerView needs a new [ViewHolder] of the given type to represent
         * an item.
         *
         *
         * This new ViewHolder should be constructed with a new View that can represent the items
         * of the given type. You can either create a new View manually or inflate it from an XML
         * layout file.
         *
         *
         * The new ViewHolder will be used to display items of the adapter using
         * [.onBindViewHolder]. Since it will be re-used to display
         * different items in the data set, it is a good idea to cache references to sub views of
         * the View to avoid unnecessary [View.findViewById] calls.
         *
         * @param parent The ViewGroup into which the new View will be added after it is bound to
         * an adapter position.
         * @param viewType The view type of the new View.
         *
         * @return A new ViewHolder that holds a View of the given view type.
         * @see .getItemViewType
         * @see .onBindViewHolder
         */
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
            val inflater = LayoutInflater.from(requireContext())

            // Inflate the custom layout

            // Inflate the custom layout
            val contactView: View = inflater.inflate(R.layout.adapter_node_layout, parent, false)

            // Return a new holder instance
            return ViewHolder(contactView)
        }

        /**
         * Returns the total number of items in the data set held by the adapter.
         *
         * @return The total number of items in this adapter.
         */
        override fun getItemCount(): Int = nodes.size

        /**
         * Called by RecyclerView to display the data at the specified position. This method should
         * update the contents of the [ViewHolder.itemView] to reflect the item at the given
         * position.
         *
         *
         * Note that unlike [android.widget.ListView], RecyclerView will not call this method
         * again if the position of the item changes in the data set unless the item itself is
         * invalidated or the new position cannot be determined. For this reason, you should only
         * use the `position` parameter while acquiring the related data item inside
         * this method and should not keep a copy of it. If you need the position of an item later
         * on (e.g. in a click listener), use [ViewHolder.getAdapterPosition] which will
         * have the updated adapter position.
         *
         * Override [.onBindViewHolder] instead if Adapter can
         * handle efficient partial bind.
         *
         * @param holder The ViewHolder which should be updated to represent the contents of the
         * item at the given position in the data set.
         * @param position The position of the item within the adapter's data set.
         */
        override fun onBindViewHolder(holder: ViewHolder, position: Int) {
            val n = nodes[position]

            holder.nodeNameView.text = n.user?.longName ?: n.user?.id ?: "Unknown node"

            val ourNodeInfo = model.nodeDB.ourNodeInfo
            val distance = ourNodeInfo?.distanceStr(n)
            if (distance != null) {
                holder.distance_view.text = distance
                holder.distance_view.visibility = View.VISIBLE
            } else {
                holder.distance_view.visibility = View.INVISIBLE
            }

            renderBattery(n.batteryPctLevel, holder)

            holder.lastTime.text = getLastTimeValue(n)
        }

        private var nodes = arrayOf<NodeInfo>()

        /// Called when our node DB changes
        fun onNodesChanged(nodesIn: Collection<NodeInfo>) {
            nodes = nodesIn.toTypedArray()
            notifyDataSetChanged() // FIXME, this is super expensive and redraws all nodes
        }
    }

    private fun renderBattery(
        battery: Int?,
        holder: ViewHolder
    ) {

        val (image, text) = when (battery) {
            null -> Pair(R.drawable.ic_battery_full_24, "?")
            0 -> Pair(R.drawable.ic_power_plug_24, "")
            else -> Pair(R.drawable.ic_battery_full_24, "$battery%")
        }

        holder.batteryPctView.text = text
        holder.powerIcon.setImageDrawable(context?.let {
            ContextCompat.getDrawable(
                it,
                image
            )
        })
    }

    private fun getLastTimeValue(n: NodeInfo): String {
        var lastTimeText = "?"
        val currentTime = (System.currentTimeMillis()/1000).toInt()
        val threeDaysLong = 3 * 60*60*24

        //if the lastSeen is too old
        if (n.lastSeen < (currentTime - threeDaysLong))
            return lastTimeText

        try {
            val toLong: Long =  n.lastSeen.toLong()
            val long1000 = toLong * 1000L
            val date = Date(long1000)
            val timeFormat = DateFormat.getTimeFormat(context)

            lastTimeText = timeFormat.format(date)

        } catch (e: ParseException) {
            //
        }
        return lastTimeText
    }


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.nodelist_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        nodeListView.adapter = nodesAdapter
        nodeListView.layoutManager = LinearLayoutManager(requireContext())

        model.nodeDB.nodes.observe(viewLifecycleOwner, Observer { it ->
            nodesAdapter.onNodesChanged(it.values)
        })
    }
}


/*


                if (false) { // hide the firmware update button for now, it is kinda ugly and users don't need it yet
                    /// Create a software update button
                    val context = ContextAmbient.current
                    RadioInterfaceService.getBondedDeviceAddress(context)?.let { macAddress ->
                        Button(
                            onClick = {
                                SoftwareUpdateService.enqueueWork(
                                    context,
                                    SoftwareUpdateService.startUpdateIntent(macAddress)
                                )
                            }
                        ) {
                            Text(text = "Update firmware")
                        }
                    }
                }
            }
        }



        /* FIXME - doens't work yet - probably because I'm not using release keys
        // If account is null, then show the signin button, otherwise
        val context = ambient(ContextAmbient)
        val account = GoogleSignIn.getLastSignedInAccount(context)
        if (account != null)
            Text("We have an account")
        else {
            Text("No account yet")
            if (context is Activity) {
                Button("Google sign-in", onClick = {
                    val signInIntent: Intent = UIState.googleSignInClient.signInIntent
                    context.startActivityForResult(signInIntent, MainActivity.RC_SIGN_IN)
                })
            }
        } */
    }
}

*/