/*
* SearchActivity on android that renders states emitted by the StateMachine
*/
class SearchActivity : BaseBetaActivity() {
  companion object {
    fun launch(activity: Activity) {
      val intent = Intent(activity, SearchActivity::class.java)
      activity.startActivity(intent)
    }
  }

  private val filterView: FilterView by lazy { FilterView(this@SearchActivity) }
  private val adapter: SearchAdapter = SearchAdapter(items = emptyList())
  private lateinit var viewModel: SearchViewModel

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.search)
    viewModel = ViewModelProviders.of(
        this,
        SearchViewModel.SearchViewModelFactory(
          application
        )
    ).get(SearchViewModel::class.java)

    initViews()

    lifecycleScope.launch {
      viewModel.viewState.collect { state ->
        render(state)
      }
    }
  }

  override fun onBackPressed() {
    viewModel.dispatchAction(Search.Action.BackButtonTapAction)
  }

  private fun render(state: Search.State) {
    when(state.type) {
      Search.StateType.InitialState -> {
        showInstructionsView()
      }
      Search.StateType.FilterOptionsLoaded -> {
        filterView.updateCountryList(state.filterOptions.filterCountryList)
      }
      Search.StateType.ShowResultsState -> {
        adapter.setItems(state.items)
        state.diffResult!!.dispatchUpdatesTo(adapter)
        search_results_list.visibility = View.VISIBLE
        instructions.visibility = View.GONE
      }
      Search.StateType.OpenFilterState -> {
        filterView.open()
      }
      Search.StateType.CloseFilterState -> {
        filterView.close()
      }
      Search.StateType.ClosePageState -> {
        finish()
      }
    }
  }

  private fun initViews() {
    filterView.attachViewModel(viewModel)
    filterView.showSortBySection(true)
    search_container.addView(filterView,
        FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.MATCH_PARENT))
    search_input.background.setColorFilter(resources.getColor(R.color.off_white), PorterDuff.Mode.SRC_IN)
    val context = this
    val layoutManager = LinearLayoutManager(context)
    search_results_list.layoutManager = layoutManager
    search_results_list.adapter = adapter
    search_results_list.addItemDecoration(DividerItemDecoration(context,
        layoutManager.orientation))
    search_results_list.addOnItemTouchListener(RecyclerItemClickListener(context, object : RecyclerItemClickListener.OnItemClickListener {
      override fun onItemClick(childView: View, position: Int) {
        ExitActivity.launch(this@SearchActivity, adapter.getItem(position)._id)
      }

      override fun onItemLongPress(childView: View, position: Int) { }
    }))
    back_btn.setOnClickListener { viewModel.dispatchAction(Search.Action.BackButtonTapAction) }
    filter_icon.setOnClickListener {
      this.closeKeyboard()
      viewModel.dispatchAction(Search.Action.TapOpenFilterIcon)
    }
    search_input.addTextChangedListener(object : TextWatcher {
      override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) { }
      override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {}
      override fun afterTextChanged(editable: Editable) {
        viewModel.dispatchAction(
          Search.Action.QueryChangeAction(
                filterState = filterView.generateFilterState(),
                query = editable.toString()
            )
        )
      }
    })
  }

  private fun showInstructionsView() {
    progress_bar.visibility = View.GONE
    instructions.visibility = View.VISIBLE
    search_results_list.visibility = View.GONE
  }

}