package com.example.secondtry

import android.content.Context
import android.graphics.Color
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextView
import androidx.appcompat.app.AlertDialog
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.ViewHolder
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.async
import org.koin.core.KoinComponent
import org.koin.core.inject
import java.util.*

class WallpostsListAdapter(
        private val wallposts: List<Wallpost>,
        private val context: Context,
        private val recyclerView: RecyclerView,
        private val nestedViewsPool: RecyclerView.RecycledViewPool) :

        RecyclerView.Adapter<WallpostsListAdapter.MyViewHolder>(), KoinComponent {

    private val repository by inject<WallpostsRepository>()
    private val viewHolders = LinkedList<MyViewHolder>()

    class MyViewHolder(layout: LinearLayout,
                       context: Context,
                       nestedViewsPool: RecyclerView.RecycledViewPool) : ViewHolder(layout) {
        val wpContent: TextView = layout.findViewById(R.id.wpContent)
        val wpHeader: TextView = layout.findViewById(R.id.wpHeader)
        val wpLinks: TextView = layout.findViewById(R.id.wpLinks)
        val commentsList: RecyclerView = layout.findViewById(R.id.commentsList)
        val innerAdapter = CommentListAdapter()
        val likeBtn: Button = layout.findViewById(R.id.btnLike)
        val commentBtn: Button = layout.findViewById(R.id.btnComment)
        val shareBtn: Button = layout.findViewById(R.id.btnShare)
        val dialog = AlertDialog.Builder(context)

        init {
            val manager = LinearLayoutManager(context)

            commentsList.apply {
                isNestedScrollingEnabled = false
                layoutManager = manager
                adapter = innerAdapter
            }

            dialog.setTitle("Under construction")
                    .setMessage("Functionality is currently under construction. Try again later.")
                    .setNeutralButton("Go back") { dialog, _ ->
                        dialog.cancel()
                    }

            commentsList.setRecycledViewPool(nestedViewsPool)
            commentsList.isNestedScrollingEnabled = false
        }
    }

    override fun getItemCount(): Int {
        return wallposts.size
    }

    override fun getItemId(position: Int): Long {
        return wallposts[position].datePosted.time + position
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        //Log.w("msg", "View holders size: ${viewHolders.size}")
        if (viewHolders.size == 0) {
            //Log.w("msg", "creating all view holders")
            for (i in 1..10) {
                val v = LayoutInflater.from(parent.context)
                        .inflate(R.layout.wallpost_view, parent, false) as LinearLayout
                val viewHolder = MyViewHolder(v, context, nestedViewsPool)
                viewHolders.push(viewHolder)
            }
        }

        val viewHolder = viewHolders.pop()
        /*val v = LayoutInflater.from(parent.context)
                .inflate(R.layout.wallpost_view, parent, false) as LinearLayout
        val viewHolder = MyViewHolder(v, context, nestedViewsPool)*/

        val onLikeClick = { likeBtn: View ->
            val index = recyclerView.getChildLayoutPosition(likeBtn.parent.parent.parent as View)
            val wp = wallposts[index]

            // TODO: check if global scope should be used
            // TODO: check how to avoid writing an unused variable to avoid returning job
            val job = GlobalScope.async {
                val newLiked = if (wp.liked == null) true else !wp.liked

                repository.likeWallpost(wallposts[index].id, newLiked)

                wallposts[index].liked = newLiked
                notifyItemChanged(index)
            }
        }

        val onCommentClick = { _: View ->
            val dialog = viewHolder.dialog.show()
            val neutralBtn = dialog.getButton(AlertDialog.BUTTON_NEUTRAL)
            val layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)
            layoutParams.gravity = Gravity.CENTER
            neutralBtn.layoutParams = layoutParams
        }

        viewHolder.apply {
            likeBtn.setOnClickListener(onLikeClick)
            commentBtn.setOnClickListener(onCommentClick)
            shareBtn.setOnClickListener(onCommentClick)
        }

        return viewHolder
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val wp = wallposts[position]
        val headerText = "${wp.username} on ${wp.datePosted}"
        val linksText = "Show previous comments (${wp.comments.size} of 5) ---- Reply ----"

        holder.apply {
            toggleLikeBtn(likeBtn, wp.liked)

            wpContent.text = wp.content
            wpHeader.text = headerText
            wpLinks.text = linksText
            innerAdapter.values = wp.comments
            commentsList.adapter?.notifyDataSetChanged()
        }
    }

    private fun toggleLikeBtn(likeBtn: Button, liked: Boolean) {
        val likeImg = if (liked) R.drawable.favourite else R.drawable.like
        val textColor = if (liked) "#065fd4" else "#808080"

        likeBtn.setCompoundDrawablesWithIntrinsicBounds(likeImg, 0, 0, 0)
        likeBtn.setTextColor(Color.parseColor(textColor))
    }
}