package com.remek.rosettapos.ui.authentication

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.databinding.DataBindingUtil
import androidx.fragment.app.Fragment
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProviders
import androidx.navigation.fragment.findNavController
import com.remek.rosettapos.BR
import com.remek.rosettapos.R
import com.remek.rosettapos.databinding.LoginScreenBinding

/**
 * Login screen for authenticating the user.
 * <p/>
 * On successful authentication the user receives the authentication tokens and the app navigates to the main screen.
 */
class LoginFragment : Fragment() {

    private lateinit var viewModel: LoginScreenViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModel = ViewModelProviders.of(this).get(LoginScreenViewModel::class.java)
        viewModel.loginSucceeded().observe(this, Observer { success ->
            if (success) {
                findNavController().navigate(R.id.action_loginFragment_to_scanFragment)
            }
        })
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val binding = DataBindingUtil.inflate<LoginScreenBinding>(inflater, R.layout.fragment_login, container, false)
        binding.lifecycleOwner = this
        binding.setVariable(BR.vm, viewModel)
        binding.executePendingBindings()
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        if (!viewModel.hasConfigurationCheckStarted()) {
            viewModel.checkConfiguration()
        }
    }


}