package com.github.libretube.adapters

import android.text.format.DateUtils
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.FragmentManager
import androidx.recyclerview.widget.RecyclerView
import com.github.libretube.R
import com.github.libretube.databinding.ChannelRowBinding
import com.github.libretube.databinding.PlaylistSearchRowBinding
import com.github.libretube.databinding.VideoRowBinding
import com.github.libretube.dialogs.PlaylistOptionsDialog
import com.github.libretube.dialogs.VideoOptionsDialog
import com.github.libretube.obj.SearchItem
import com.github.libretube.obj.Subscribe
import com.github.libretube.preferences.PreferenceHelper
import com.github.libretube.util.ConnectionHelper
import com.github.libretube.util.NavigationHelper
import com.github.libretube.util.RetrofitInstance
import com.github.libretube.util.formatShort
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.io.IOException

class SearchAdapter(
    private val searchItems: MutableList<SearchItem>,
    private val childFragmentManager: FragmentManager
) :
    RecyclerView.Adapter<SearchViewHolder>() {

    fun updateItems(newItems: List<SearchItem>) {
        val searchItemsSize = searchItems.size
        searchItems.addAll(newItems)
        notifyItemRangeInserted(searchItemsSize, newItems.size)
    }

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

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SearchViewHolder {
        val layoutInflater = LayoutInflater.from(parent.context)

        return when (viewType) {
            0 -> SearchViewHolder(
                VideoRowBinding.inflate(layoutInflater, parent, false)
            )
            1 -> SearchViewHolder(
                ChannelRowBinding.inflate(layoutInflater, parent, false)
            )
            2 -> SearchViewHolder(
                PlaylistSearchRowBinding.inflate(layoutInflater, parent, false)
            )
            else -> throw IllegalArgumentException("Invalid type")
        }
    }

    override fun onBindViewHolder(holder: SearchViewHolder, position: Int) {
        val searchItem = searchItems[position]

        val videoRowBinding = holder.videoRowBinding
        val channelRowBinding = holder.channelRowBinding
        val playlistRowBinding = holder.playlistRowBinding

        if (videoRowBinding != null) bindWatch(searchItem, videoRowBinding)
        else if (channelRowBinding != null) bindChannel(searchItem, channelRowBinding)
        else if (playlistRowBinding != null) bindPlaylist(searchItem, playlistRowBinding)
    }

    override fun getItemViewType(position: Int): Int {
        return when {
            searchItems[position].url!!.startsWith("/watch", false) -> 0
            searchItems[position].url!!.startsWith("/channel", false) -> 1
            searchItems[position].url!!.startsWith("/playlist", false) -> 2
            else -> 3
        }
    }

    private fun bindWatch(item: SearchItem, binding: VideoRowBinding) {
        binding.apply {
            ConnectionHelper.loadImage(item.thumbnail, thumbnail)
            if (item.duration != -1L) {
                thumbnailDuration.text = DateUtils.formatElapsedTime(item.duration!!)
            } else {
                thumbnailDuration.text = root.context.getString(R.string.live)
                thumbnailDuration.setBackgroundColor(R.attr.colorPrimaryDark)
            }
            ConnectionHelper.loadImage(item.uploaderAvatar, channelImage)
            videoTitle.text = item.title
            val viewsString = if (item.views?.toInt() != -1) item.views.formatShort() else ""
            val uploadDate = if (item.uploadedDate != null) item.uploadedDate else ""
            videoInfo.text =
                if (viewsString != "" && uploadDate != "") {
                    "$viewsString • $uploadDate"
                } else {
                    viewsString + uploadDate
                }
            channelName.text = item.uploaderName
            root.setOnClickListener {
                NavigationHelper.navigateVideo(root.context, item.url)
            }
            root.setOnLongClickListener {
                val videoId = item.url!!.replace("/watch?v=", "")
                VideoOptionsDialog(videoId, root.context)
                    .show(childFragmentManager, "VideoOptionsDialog")
                true
            }
            channelImage.setOnClickListener {
                NavigationHelper.navigateChannel(root.context, item.uploaderUrl)
            }
        }
    }

    private fun bindChannel(item: SearchItem, binding: ChannelRowBinding) {
        binding.apply {
            ConnectionHelper.loadImage(item.thumbnail, searchChannelImage)
            searchChannelName.text = item.name
            searchViews.text = root.context.getString(
                R.string.subscribers,
                item.subscribers.formatShort()
            ) + " • " + root.context.getString(R.string.videoCount, item.videos.toString())
            root.setOnClickListener {
                NavigationHelper.navigateChannel(root.context, item.url)
            }
            val channelId = item.url?.replace("/channel/", "")!!
            val token = PreferenceHelper.getToken()

            // only show subscribe button if logged in
            if (token != "") isSubscribed(channelId, token, binding)
        }
    }

    private fun isSubscribed(channelId: String, token: String, binding: ChannelRowBinding) {
        var isSubscribed = false

        // check whether the user subscribed to the channel
        CoroutineScope(Dispatchers.Main).launch {
            val response = try {
                RetrofitInstance.authApi.isSubscribed(
                    channelId,
                    token
                )
            } catch (e: Exception) {
                return@launch
            }

            // if subscribed change text to unsubscribe
            if (response.subscribed == true) {
                isSubscribed = true
                binding.searchSubButton.text = binding.root.context.getString(R.string.unsubscribe)
            }

            // make sub button visible and set the on click listeners to (un)subscribe
            if (response.subscribed != null) {
                binding.searchSubButton.visibility = View.VISIBLE

                binding.searchSubButton.setOnClickListener {
                    if (!isSubscribed) {
                        subscribe(token, channelId)
                        binding.searchSubButton.text =
                            binding.root.context.getString(R.string.unsubscribe)
                        isSubscribed = true
                    } else {
                        unsubscribe(token, channelId)
                        binding.searchSubButton.text =
                            binding.root.context.getString(R.string.subscribe)
                        isSubscribed = false
                    }
                }
            }
        }
    }

    private fun subscribe(token: String, channelId: String) {
        CoroutineScope(Dispatchers.IO).launch {
            try {
                RetrofitInstance.authApi.subscribe(
                    token,
                    Subscribe(channelId)
                )
            } catch (e: Exception) {
                return@launch
            }
        }
    }

    private fun unsubscribe(token: String, channelId: String) {
        CoroutineScope(Dispatchers.IO).launch {
            try {
                RetrofitInstance.authApi.unsubscribe(
                    token,
                    Subscribe(channelId)
                )
            } catch (e: IOException) {
                return@launch
            }
        }
    }

    private fun bindPlaylist(item: SearchItem, binding: PlaylistSearchRowBinding) {
        binding.apply {
            ConnectionHelper.loadImage(item.thumbnail, searchThumbnail)
            if (item.videos?.toInt() != -1) searchPlaylistNumber.text = item.videos.toString()
            searchDescription.text = item.name
            searchName.text = item.uploaderName
            if (item.videos?.toInt() != -1) {
                searchPlaylistVideos.text =
                    root.context.getString(R.string.videoCount, item.videos.toString())
            }
            root.setOnClickListener {
                NavigationHelper.navigatePlaylist(root.context, item.url)
            }
            root.setOnLongClickListener {
                val playlistId = item.url!!.replace("/playlist?list=", "")
                PlaylistOptionsDialog(playlistId, false, root.context)
                    .show(childFragmentManager, "PlaylistOptionsDialog")
                true
            }
        }
    }
}

class SearchViewHolder : RecyclerView.ViewHolder {
    var videoRowBinding: VideoRowBinding? = null
    var channelRowBinding: ChannelRowBinding? = null
    var playlistRowBinding: PlaylistSearchRowBinding? = null

    constructor(binding: VideoRowBinding) : super(binding.root) {
        videoRowBinding = binding
    }

    constructor(binding: ChannelRowBinding) : super(binding.root) {
        channelRowBinding = binding
    }

    constructor(binding: PlaylistSearchRowBinding) : super(binding.root) {
        playlistRowBinding = binding
    }
}