package org.mozilla.fenix.collections

/* This Source Code Form is subject to the terms of the Mozilla Public
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import android.app.Dialog
import android.content.Context
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.inputmethod.InputMethodManager
import androidx.fragment.app.DialogFragment
import androidx.lifecycle.ViewModelProviders
import kotlinx.android.synthetic.main.fragment_create_collection.view.*
import org.mozilla.fenix.R
import org.mozilla.fenix.mvi.ActionBusFactory
import org.mozilla.fenix.mvi.getAutoDisposeObservable
import org.mozilla.fenix.mvi.getManagedEmitter

class CreateCollectionFragment : DialogFragment() {
    private lateinit var collectionCreationComponent: CollectionCreationComponent

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        isCancelable = false
        setStyle(STYLE_NO_TITLE, R.style.CreateCollectionDialogStyle)
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.fragment_create_collection, container, false)

        val viewModel = activity?.run {
            ViewModelProviders.of(this).get(CreateCollectionViewModel::class.java)
        }
        val tabs = viewModel!!.tabs
        val selectedTabs = viewModel.selectedTabs

        collectionCreationComponent = CollectionCreationComponent(
            view.create_collection_wrapper,
            ActionBusFactory.get(this),
            CollectionCreationState(tabs = tabs, selectedTabs = selectedTabs)
        )
        return view
    }

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val dialog = super.onCreateDialog(savedInstanceState)
        dialog.setOnKeyListener { _, keyCode, event ->
            (collectionCreationComponent.uiView as CollectionCreationUIView).onKey(keyCode, event)
        }
        return dialog
    }

    override fun onResume() {
        super.onResume()
        subscribeToActions()
    }

    private fun subscribeToActions() {
        getAutoDisposeObservable<CollectionCreationAction>().subscribe {
            when (it) {
                is CollectionCreationAction.Close -> dismiss()
                is CollectionCreationAction.SaveTabsToCollection -> {
                    getManagedEmitter<CollectionCreationChange>()
                        .onNext(CollectionCreationChange.StepChanged(SaveCollectionStep.SelectCollection))
                }
                is CollectionCreationAction.AddTabToSelection -> getManagedEmitter<CollectionCreationChange>()
                    .onNext(CollectionCreationChange.TabAdded(it.tab))
                is CollectionCreationAction.RemoveTabFromSelection -> getManagedEmitter<CollectionCreationChange>()
                    .onNext(CollectionCreationChange.TabRemoved(it.tab))
                is CollectionCreationAction.SelectAllTapped -> getManagedEmitter<CollectionCreationChange>()
                    .onNext(CollectionCreationChange.AddAllTabs)
                is CollectionCreationAction.AddNewCollection -> getManagedEmitter<CollectionCreationChange>().onNext(
                    CollectionCreationChange.StepChanged(SaveCollectionStep.NameCollection)
                )
                is CollectionCreationAction.BackPressed -> handleBackPress(backPressFrom = it.backPressFrom)
            }
        }
    }

    private fun handleBackPress(backPressFrom: SaveCollectionStep) {
        when (backPressFrom) {
            SaveCollectionStep.SelectTabs -> dismiss()
            SaveCollectionStep.SelectCollection -> getManagedEmitter<CollectionCreationChange>().onNext(
                CollectionCreationChange.StepChanged(SaveCollectionStep.SelectTabs)
            )
            SaveCollectionStep.NameCollection -> {
                val imm =
                    view?.context?.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
                imm?.hideSoftInputFromWindow(view?.windowToken, 0)
                getManagedEmitter<CollectionCreationChange>().onNext(
                    CollectionCreationChange.StepChanged(SaveCollectionStep.SelectCollection)
                )
            }
        }
    }

    companion object {
        const val createCollectionTag = "createCollection"
    }
}