/**
 * TrackerMap
 * Copyright (C) 2021-2022  Iván Ávalos <avalos@disroot.org>, Henoch Ojeda <imhenoch@protonmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package mx.trackermap.TrackerMap.android.session

import android.content.*
import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.fragment.app.Fragment
import androidx.localbroadcastmanager.content.LocalBroadcastManager
import androidx.preference.PreferenceManager
import com.zhuinden.liveevent.observe
import kotlinx.coroutines.DelicateCoroutinesApi
import mx.trackermap.TrackerMap.android.R
import mx.trackermap.TrackerMap.android.databinding.LoginBinding
import mx.trackermap.TrackerMap.android.units.UnitsActivity
import mx.trackermap.TrackerMap.controllers.SessionController
import org.koin.androidx.viewmodel.ext.android.viewModel
import kotlin.time.ExperimentalTime

@DelicateCoroutinesApi
@ExperimentalTime
class LoginFragment : Fragment() {
    private var _binding: LoginBinding? = null
    private val binding get() = _binding!!
    private val loginViewModel: LoginViewModel by viewModel()
    private lateinit var broadcastManager: LocalBroadcastManager

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = LoginBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        setupEvents()
        setupObservers()
        broadcastManager = LocalBroadcastManager.getInstance(requireActivity())
        binding.urlEditText.setText(
            PreferenceManager
                .getDefaultSharedPreferences(requireActivity())
                .getString(
                    PREFERENCE_SERVER_URL,
                    getString(R.string.default_server_url)
                ) ?: getString(R.string.default_server_url)
        )
    }

    override fun onStart() {
        super.onStart()
        val intentFilter = IntentFilter(EVENT_TOKEN)
        broadcastManager.registerReceiver(broadcastReceiver, intentFilter)
    }

    override fun onStop() {
        super.onStop()
        broadcastManager.unregisterReceiver(broadcastReceiver)
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

    private fun setupEvents() {
        binding.signinButton.setOnClickListener {
            loginViewModel.login(
                binding.usernameEditText.text.toString(),
                binding.passwordEditText.text.toString(),
                binding.urlEditText.text.toString(),
                PreferenceManager
                    .getDefaultSharedPreferences(requireActivity())
                    .getString(PREFERENCE_TOKEN, null)
            )
        }
    }

    private fun setupObservers() {
        loginViewModel.networkAvailable.observe(viewLifecycleOwner) { available ->
            Log.d("LoginFragment", "available = $available, session = ${loginViewModel.hasSession}")

            binding.offlineBanner.root.visibility =
                if (available == true) View.GONE else View.VISIBLE

            binding.infoLoading.root.visibility = when (available) {
                null -> View.VISIBLE
                true -> if (loginViewModel.hasSession) {
                    loginViewModel.restoreSession()
                    View.VISIBLE
                } else View.GONE
                false -> if (loginViewModel.hasSession) {
                    View.VISIBLE
                } else {
                    View.GONE
                }
            }
        }

        loginViewModel.loginState.observe(viewLifecycleOwner) { result ->
            Log.d("LoginFragment", result.toString())
            when (result) {
                SessionController.LoginState.Nothing -> {
                    binding.infoLoading.root.visibility = View.GONE
                }
                SessionController.LoginState.Loading -> {
                    binding.infoLoading.root.visibility = View.VISIBLE
                }
                SessionController.LoginState.UrlMissing -> {
                    binding.infoLoading.root.visibility = View.GONE
                    Toast.makeText(context, getString(R.string.login_url_missing), Toast.LENGTH_SHORT).show()
                }
                SessionController.LoginState.EmailMissing -> {
                    binding.infoLoading.root.visibility = View.GONE
                    Toast.makeText(context, getString(R.string.login_username_missing), Toast.LENGTH_SHORT).show()
                }
                SessionController.LoginState.PasswordMissing -> {
                    binding.infoLoading.root.visibility = View.GONE
                    Toast.makeText(context, getString(R.string.login_password_missing), Toast.LENGTH_SHORT).show()
                }
                SessionController.LoginState.Failure -> {
                    binding.infoLoading.root.visibility = View.GONE
                    Toast.makeText(context, getString(R.string.login_login_failed), Toast.LENGTH_SHORT).show()
                }
                SessionController.LoginState.Success -> {
                    PreferenceManager
                        .getDefaultSharedPreferences(requireActivity())
                        .edit()
                        .putString(PREFERENCE_SERVER_URL, binding.urlEditText.text.toString())
                        .apply()

                    broadcastManager.sendBroadcast(Intent(EVENT_LOGIN))
                    val activity = requireActivity()
                    val intent = Intent(activity.applicationContext, UnitsActivity::class.java)
                    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
                    startActivity(intent)
                    activity.finish()
                }
                else -> {}
            }
        }
    }

    private val broadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(p0: Context?, p1: Intent?) {
            p1?.getStringExtra(KEY_TOKEN)?.let { token ->
                PreferenceManager
                    .getDefaultSharedPreferences(requireActivity())
                    .edit()
                    .putString(PREFERENCE_TOKEN, token)
                    .apply()
            }
        }
    }

    companion object {
        const val EVENT_LOGIN = "eventLogin"
        const val EVENT_TOKEN = "eventToken"
        const val KEY_TOKEN = "keyToken"

        const val PREFERENCE_SERVER_URL = "server_url"
        const val PREFERENCE_TOKEN = "token"
    }
}