package com.lagradost.cloudstream3.ui.download

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.isVisible
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProvider
import androidx.navigation.findNavController
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.lagradost.cloudstream3.R
import com.lagradost.cloudstream3.isMovieType
import com.lagradost.cloudstream3.mvvm.observe
import com.lagradost.cloudstream3.ui.download.DownloadButtonSetup.handleDownloadClick
import com.lagradost.cloudstream3.utils.AppUtils.loadResult
import com.lagradost.cloudstream3.utils.DOWNLOAD_EPISODE_CACHE
import com.lagradost.cloudstream3.utils.DataStore
import com.lagradost.cloudstream3.utils.UIHelper.fixPaddingStatusbar
import com.lagradost.cloudstream3.utils.UIHelper.hideKeyboard
import com.lagradost.cloudstream3.utils.VideoDownloadHelper
import com.lagradost.cloudstream3.utils.VideoDownloadManager
import kotlinx.android.synthetic.main.fragment_downloads.*

const val DOWNLOAD_NAVIGATE_TO = "downloadpage"

class DownloadFragment : Fragment() {
    private lateinit var downloadsViewModel: DownloadViewModel

    private fun getBytesAsText(bytes: Long): String {
        return "%.1f".format(bytes / 1000000000f)
    }

    private fun View.setLayoutWidth(weight: Long) {
        val param = LinearLayout.LayoutParams(
            0,
            LinearLayout.LayoutParams.MATCH_PARENT,
            maxOf((weight / 1000000000f), 0.1f) // 100mb
        )
        this.layoutParams = param
    }

    private fun setList(list: List<VisualDownloadHeaderCached>) {
        (download_list?.adapter as DownloadHeaderAdapter?)?.cardList = list
        download_list?.adapter?.notifyDataSetChanged()
    }

    override fun onDestroyView() {
        (download_list?.adapter as DownloadHeaderAdapter?)?.killAdapter()
        super.onDestroyView()
    }

    override fun onDestroy() {
        downloadDeleteEventListener?.let { VideoDownloadManager.downloadDeleteEvent -= it }
        super.onDestroy()
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        downloadsViewModel =
            ViewModelProvider(this).get(DownloadViewModel::class.java)
        observe(downloadsViewModel.noDownloadsText) {
            text_no_downloads.text = it
        }
        observe(downloadsViewModel.headerCards) {
            setList(it)
            download_loading.isVisible = false
        }
        observe(downloadsViewModel.availableBytes) {
            download_free_txt?.text =
                getString(R.string.storage_size_format).format(getString(R.string.free_storage), getBytesAsText(it))
            download_free?.setLayoutWidth(it)
        }
        observe(downloadsViewModel.usedBytes) {
            download_used_txt?.text =
                getString(R.string.storage_size_format).format(getString(R.string.used_storage), getBytesAsText(it))
            download_used?.setLayoutWidth(it)
        }
        observe(downloadsViewModel.downloadBytes) {
            download_app_txt?.text =
                getString(R.string.storage_size_format).format(getString(R.string.app_storage), getBytesAsText(it))
            download_app?.setLayoutWidth(it)
            download_storage_appbar?.visibility = View.VISIBLE
        }
        return inflater.inflate(R.layout.fragment_downloads, container, false)
    }

    private var downloadDeleteEventListener: ((Int) -> Unit)? = null

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

        val adapter: RecyclerView.Adapter<RecyclerView.ViewHolder> =
            DownloadHeaderAdapter(
                ArrayList(),
                { click ->
                    when (click.action) {
                        0 -> {
                            if (click.data.type.isMovieType()) {
                                //wont be called
                            } else {
                                val folder = DataStore.getFolderName(DOWNLOAD_EPISODE_CACHE, click.data.id.toString())
                                val navController = activity?.findNavController(R.id.nav_host_fragment)
                                navController?.navigate(
                                    R.id.navigation_download_child,
                                    DownloadChildFragment.newInstance(click.data.name, folder)
                                )
                            }
                        }
                        1 -> {
                            (activity as AppCompatActivity?)?.loadResult(click.data.url, click.data.apiName)
                        }
                    }

                },
                { downloadClickEvent ->
                    if (downloadClickEvent.data !is VideoDownloadHelper.DownloadEpisodeCached) return@DownloadHeaderAdapter
                    handleDownloadClick(activity, downloadClickEvent.data.name, downloadClickEvent)
                    if (downloadClickEvent.action == DOWNLOAD_ACTION_DELETE_FILE) {
                        context?.let { ctx ->
                            downloadsViewModel.updateList(ctx)
                        }
                    }
                }
            )

        downloadDeleteEventListener = { id ->
            val list = (download_list?.adapter as DownloadHeaderAdapter?)?.cardList
            if (list != null) {
                if (list.any { it.data.id == id }) {
                    context?.let { ctx ->
                        setList(ArrayList())
                        downloadsViewModel.updateList(ctx)
                    }
                }
            }
        }

        downloadDeleteEventListener?.let { VideoDownloadManager.downloadDeleteEvent += it }

        download_list.adapter = adapter
        download_list.layoutManager = GridLayoutManager(context, 1)
        downloadsViewModel.updateList(requireContext())

        context?.fixPaddingStatusbar(download_root)
    }
}