package com.jetredsbytes.togglclient.presentation.switcher

import android.view.View
import android.view.ViewGroup
import com.jetredsbytes.togglclient.R
import dagger.android.DaggerActivity
import kotlinx.android.synthetic.main.error_screen.view.*


class StateViewSwitcher(activity: DaggerActivity) {
    private lateinit var mainView: View
    private val states = HashMap<StateView, ViewInfo>()
    private val layoutInflater = activity.layoutInflater
    private lateinit var container: ViewGroup

    fun initMainView(view: View) = apply {
        this.mainView = view
        this.container = mainView.parent as ViewGroup
        states[StateView.STATE_MAIN] = ViewInfo(0, mainView)
    }

    fun switchToError(errorMessage: String, listener: StateSwitcherEvent.OnErrorEvent) {
        val errorView = layoutInflater.inflate(R.layout.error_screen, container, false)
        errorView.tvError.text = errorMessage
        errorView.btnRetry.setOnClickListener {
            listener.onRetryButtonClick()
        }
        addViewState(StateView.STATE_ERROR, errorView)
        switchToError()
    }

    fun switchToLoading() {
        val loadingView = layoutInflater.inflate(R.layout.loading_screen, container, false)
        addViewState(StateView.STATE_LOADING, loadingView)
        switchToState(StateView.STATE_LOADING)
        show(loadingView)
    }

    fun switchToMain() = switchToState(StateView.STATE_MAIN)

    private fun switchToEmpty() = switchToState(StateView.STATE_EMPTY)

    private fun switchToSearchResultsEmpty() = switchToState(StateView.STATE_NOT_FOUND)

    private fun switchToError() = switchToState(StateView.STATE_ERROR)

    private fun inflateStateView(layout: Int) = layoutInflater.inflate(layout, container, false)

    private fun addViewState(state: StateView, stateView: View) {
        stateView.visibility = View.GONE
        states[state] = ViewInfo(0, stateView)
    }

    private fun switchToState(state: StateView) {
        val viewInfo = states[state] ?: return
        if (viewInfo.view == null) {
            viewInfo.view = layoutInflater.inflate(viewInfo.layoutId, container, false)
        }
        val nextView = viewInfo.view
        if (nextView == null || nextView == mainView) return
        if (nextView.parent != container) container.addView(nextView)
        show(nextView)
    }

    private fun show(nextView: View) {
        mainView.visibility = View.GONE
        nextView.visibility = View.VISIBLE
        mainView = nextView
    }

    private class ViewInfo(var layoutId: Int, var view: View?)

}