package net.lacolaco.smileessence.activity

import android.app.ActivityManager
import android.os.Bundle
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.ItemTouchHelper
import android.view.View
import android.view.ViewGroup

import kotlinx.android.synthetic.main.activity_manage_pages.*
import kotlinx.android.synthetic.main.list_item_page.view.*
import net.lacolaco.smileessence.R
import net.lacolaco.smileessence.World
import net.lacolaco.smileessence.data.PageInfo
import net.lacolaco.smileessence.view.dialog.EditTweetsPageDialogFragment

class ManagePagesActivity : AppCompatActivity() {
    private val world by lazy {
        World[intent.getLongExtra(INTENT_KEY_WORLD_ID, -1)]
    }
    private var mainActivityNeedsRestart = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setTheme(if (world.useDarkTheme) R.style.AppTheme_Dark else R.style.AppTheme_Light)
        setContentView(R.layout.activity_manage_pages)
        setSupportActionBar(toolbar)

        val label = getString(R.string.app_name) + " - @" + world.user.screenName
        setTaskDescription(ActivityManager.TaskDescription(label, null, world.themeColor))
        window.statusBarColor = world.themeColor
        toolbar.setBackgroundColor(world.themeColor)

        if (savedInstanceState != null)
            mainActivityNeedsRestart = savedInstanceState.getBoolean(KEY_IS_CHANGED)

        val helper = ItemTouchHelper(object : ItemTouchHelper.Callback() {
            override fun getMovementFlags(recyclerView: RecyclerView,
                                          viewHolder: RecyclerView.ViewHolder): Int {
                return makeMovementFlags(ItemTouchHelper.DOWN or ItemTouchHelper.UP,
                        ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT)
            }

            override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder,
                                target: RecyclerView.ViewHolder): Boolean {
                return (recycler_view.adapter as PagesAdapter)
                        .move(viewHolder.adapterPosition, target.adapterPosition)
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                (recycler_view.adapter as PagesAdapter).remove(viewHolder.adapterPosition)
            }
        })
        helper.attachToRecyclerView(recycler_view)
        recycler_view.addItemDecoration(helper)
        recycler_view.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))
        recycler_view.adapter = PagesAdapter()

        fab.setOnClickListener { addNewItem() }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        outState.putBoolean(KEY_IS_CHANGED, mainActivityNeedsRestart)
    }

    override fun finish() {
        // MainActivity will restart itself on RESULT_OK
        setResult(if (mainActivityNeedsRestart) RESULT_OK else RESULT_CANCELED)
        super.finish()
    }

    private fun addNewItem() {
        val types = listOf(
                "Compose" to { PageInfo.ComposePageInfo() },
                "Tweets" to { PageInfo.TweetsPageInfo("Tweets", listOf()) },
                "Events" to { PageInfo.EventsPageInfo() },
                "Search" to { PageInfo.SearchPageInfo("") },
                "List" to { PageInfo.ListPageInfo(null) }
        )
        AlertDialog.Builder(this)
                .setTitle("Add a new page")
                .setItems(types.map { it.first }.toTypedArray()) { di, i ->
                    di.dismiss()
                    mainActivityNeedsRestart = true
                    val item = types[i].second()
                    world.pages.add(item)
                    recycler_view.adapter!!.notifyItemInserted(world.pages.size - 1)
                    openItemEditor(item)
                }.show()
    }

    private fun openItemEditor(item: PageInfo) {
        if (item is PageInfo.TweetsPageInfo) {
            EditTweetsPageDialogFragment.newInstance(world, item)
        } else
            Snackbar.make(fab, "Nothing to configure", Snackbar.LENGTH_SHORT).show()
    }

    companion object {
        const val INTENT_KEY_WORLD_ID = "WORLD_ID"
        private const val KEY_IS_CHANGED = "IS_CHANGED"
    }

    private inner class PagesAdapter : RecyclerView.Adapter<PagesAdapter.ViewHolder>() {
        override fun onBindViewHolder(holder: ViewHolder, position: Int) {
            val item = world.pages[position]
            val view = holder.itemView

            view.page_kind_text_view.text = item.name
            view.page_name_text_view.text = item.describe()
            view.setOnClickListener { openItemEditor(item) }
        }

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

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
            return ViewHolder(layoutInflater.inflate(R.layout.list_item_page, parent, false))
        }

        fun move(before: Int, after: Int): Boolean {
            mainActivityNeedsRestart = true
            val item = world.pages.removeAt(before)
            world.pages.add(after, item)
            notifyItemMoved(before, after)
            return true
        }

        fun remove(position: Int) {
            mainActivityNeedsRestart = true
            world.pages.removeAt(position)
            notifyItemRemoved(position)
            notifyItemRangeChanged(position, world.pages.size)
        }

        private inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
    }
}