/*

 * Geekttrss is a RSS feed reader application on the Android Platform.

 *

 *

 * This file is part of Geekttrss.

 *

 * Geekttrss is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * Geekttrss 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with Geekttrss.  If not, see <http://www.gnu.org/licenses/>.

 */

package com.geekorum.ttrss.accounts

import android.accounts.Account

import android.accounts.AccountManager

import android.app.Activity

import android.os.Bundle

import android.transition.TransitionManager

import android.view.View

import android.view.ViewGroup

import androidx.activity.viewModels

import androidx.databinding.DataBindingUtil

import androidx.lifecycle.Observer

import com.geekorum.geekdroid.accounts.AccountAuthenticatorAppCompatActivity

import com.geekorum.geekdroid.app.lifecycle.EventObserver

import com.geekorum.geekdroid.dagger.DaggerDelegateViewModelsFactory

import com.geekorum.ttrss.R

import com.geekorum.ttrss.databinding.ActivityLoginAccountBinding

import com.google.android.material.snackbar.Snackbar

import com.google.android.material.textfield.TextInputLayout

import dagger.hilt.android.AndroidEntryPoint

import javax.inject.Inject

/**

 * A Login screen to a Tinytinyrss server.

 */

@AndroidEntryPoint

class LoginActivity : AccountAuthenticatorAppCompatActivity() {

    companion object {

        const val ACTION_ADD_ACCOUNT = "add_account"

        const val ACTION_CONFIRM_CREDENTIALS = "confirm_credentials"

        const val EXTRA_ACCOUNT = "account"

    }

    @Inject

    lateinit var accountManager: AndroidTinyrssAccountManager

    private lateinit var binding: ActivityLoginAccountBinding

    private val loginViewModel: LoginViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        binding = DataBindingUtil.setContentView(this, R.layout.activity_login_account)

        binding.lifecycleOwner = this

        setSupportActionBar(binding.toolbar)

        val account = intent.getParcelableExtra<Account>(EXTRA_ACCOUNT)?.let {

            accountManager.fromAndroidAccount(it)

        }

        val action = requireNotNull(intent?.action) { "Invalid intent action passed to $this"}

        loginViewModel.initialize(action, account)

        binding.viewModel = loginViewModel

        loginViewModel.loginInProgress.observe(this, Observer { inProgress ->

            showProgress(inProgress!!)

        })

        loginViewModel.loginFailedEvent.observe(this, EventObserver { event ->

            if (event.errorMsgId in listOf(R.string.error_http_forbidden, R.string.error_http_unauthorized)) {

                binding.form.useHttpAuth.isChecked = true

            }

            Snackbar.make(binding.root, event.errorMsgId, Snackbar.LENGTH_SHORT).show()

        })

        loginViewModel.actionCompleteEvent.observe(this, EventObserver { event->

            when (event) {

                is LoginViewModel.ActionCompleteEvent.Failed -> handleActionFailed()

                is LoginViewModel.ActionCompleteEvent.Success -> handleActionSuccess(event)

            }

        })

        loginViewModel.fieldErrors.observe(this, Observer { errorStatus ->

            val error = checkNotNull(errorStatus)

            setFieldError(binding.form.urlField, error.invalidUrlMsgId)

            if (error.hasAttemptLogin) {

                setFieldError(binding.form.usernameField, error.invalidNameMsgId)

                setFieldError(binding.form.passwordField, error.invalidPasswordMsgId)

            }

        })

    }

    private fun handleActionSuccess(event: LoginViewModel.ActionCompleteEvent.Success) {

        accountAuthenticatorResult = Bundle().apply {

            when (intent.action) {

                ACTION_ADD_ACCOUNT -> {

                    putString(AccountManager.KEY_ACCOUNT_TYPE, AccountAuthenticator.TTRSS_ACCOUNT_TYPE)

                    putString(AccountManager.KEY_ACCOUNT_NAME, event.account.username)

                }

                ACTION_CONFIRM_CREDENTIALS -> putBoolean(AccountManager.KEY_BOOLEAN_RESULT, true)

            }

        }

        setResult(Activity.RESULT_OK)

        finish()

    }

    private fun handleActionFailed() {

        accountAuthenticatorResult = Bundle().apply {

            when (intent.action) {

                ACTION_ADD_ACCOUNT -> {

                    putInt(AccountManager.KEY_ERROR_CODE, AccountAuthenticator.ERROR_CODE_AUTHENTICATOR_FAILURE)

                    putString(AccountManager.KEY_ERROR_MESSAGE, "Unable to add account")

                }

                ACTION_CONFIRM_CREDENTIALS -> putBoolean(AccountManager.KEY_BOOLEAN_RESULT, false)

            }

        }

        finish()

    }

    private fun setFieldError(view: TextInputLayout, errorId: Int?) {

        val errorMsg = if (errorId != null) getString(errorId) else null

        view.error = errorMsg

    }

    private fun showProgress(show: Boolean) {

        TransitionManager.beginDelayedTransition(binding.root as ViewGroup)

        binding.form.loginForm.visibility = if (show) View.GONE else View.VISIBLE

        binding.form.loginProgress.visibility = if (show) View.VISIBLE else View.GONE

    }

}