/**
 * Teapod
 *
 * Copyright 2020-2021  <seil0@mosad.xyz>
 *
 * This program 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

package org.mosad.teapod.activity.main

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.view.MenuItem
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.Fragment
import androidx.fragment.app.commit
import com.afollestad.materialdialogs.MaterialDialog
import com.afollestad.materialdialogs.callbacks.onDismiss
import com.google.android.material.bottomnavigation.BottomNavigationView
import kotlinx.coroutines.joinAll
import kotlinx.coroutines.runBlocking
import org.mosad.teapod.R
import org.mosad.teapod.databinding.ActivityMainBinding
import org.mosad.teapod.parser.AoDParser
import org.mosad.teapod.activity.player.PlayerActivity
import org.mosad.teapod.preferences.EncryptedPreferences
import org.mosad.teapod.preferences.Preferences
import org.mosad.teapod.ui.components.LoginDialog
import org.mosad.teapod.activity.main.fragments.AccountFragment
import org.mosad.teapod.activity.main.fragments.HomeFragment
import org.mosad.teapod.activity.main.fragments.LibraryFragment
import org.mosad.teapod.activity.main.fragments.SearchFragment
import org.mosad.teapod.activity.onboarding.OnboardingActivity
import org.mosad.teapod.util.DataTypes
import org.mosad.teapod.util.StorageController
import java.net.SocketTimeoutException
import kotlin.system.exitProcess
import kotlin.system.measureTimeMillis

class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener {

    private lateinit var binding: ActivityMainBinding
    private var activeBaseFragment: Fragment = HomeFragment() // the currently active fragment, home at the start

    companion object {
        var wasInitialized = false
    }

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

        if (!wasInitialized) { load() }
        theme.applyStyle(getThemeResource(), true)

        binding = ActivityMainBinding.inflate(layoutInflater)
        binding.navView.setOnNavigationItemSelectedListener(this)
        setContentView(binding.root)

        supportFragmentManager.commit {
            replace(R.id.nav_host_fragment, activeBaseFragment, activeBaseFragment.javaClass.simpleName)
        }
    }

    override fun onBackPressed() {
        if (supportFragmentManager.backStackEntryCount > 0) {
            supportFragmentManager.popBackStack()
        } else {
            if (activeBaseFragment !is HomeFragment) {
                binding.navView.selectedItemId = R.id.navigation_home
            } else {
                super.onBackPressed()
            }
        }
    }

    override fun onNavigationItemSelected(item: MenuItem): Boolean {
        if (supportFragmentManager.backStackEntryCount > 0) {
            supportFragmentManager.popBackStack()
        }

        val ret = when (item.itemId) {
            R.id.navigation_home -> {
                activeBaseFragment = HomeFragment()
                true
            }
            R.id.navigation_library -> {
                activeBaseFragment = LibraryFragment()
                true
            }
            R.id.navigation_search -> {
                activeBaseFragment = SearchFragment()
                true
            }
            R.id.navigation_account -> {
                activeBaseFragment = AccountFragment()
                true
            }
            else -> false
        }

        supportFragmentManager.commit {
            replace(R.id.nav_host_fragment, activeBaseFragment, activeBaseFragment.javaClass.simpleName)
        }

        return ret
    }

    private fun getThemeResource(): Int {
        return when (Preferences.theme) {
            DataTypes.Theme.LIGHT -> R.style.AppTheme_Light
            else -> R.style.AppTheme_Dark
        }
    }

    /**
     * initial loading and login are run in parallel, as initial loading doesn't require
     * any login cookies
     */
    private fun load() {
        val time = measureTimeMillis {
            val loadingJob = AoDParser.initialLoading() // start the initial loading

            // load all saved stuff here
            Preferences.load(this)
            EncryptedPreferences.readCredentials(this)
            StorageController.load(this)

            // show onbaording
            if (EncryptedPreferences.password.isEmpty()) {
                showOnboarding()
            } else {
                try {
                    if (!AoDParser.login()) {
                        showLoginDialog()
                    }
                } catch (ex: SocketTimeoutException) {
                    Log.w(javaClass.name, "Timeout during login!")

                    // show waring dialog before finishing
                    MaterialDialog(this).show {
                        title(R.string.dialog_timeout_head)
                        message(R.string.dialog_timeout_desc)
                        onDismiss { exitAndRemoveTask() }
                    }
                }
            }

            runBlocking { loadingJob.joinAll() } // wait for initial loading to finish
        }
        Log.i(javaClass.name, "loading and login in $time ms")

        wasInitialized = true
    }

    private fun showLoginDialog() {
        LoginDialog(this, false).positiveButton {
            EncryptedPreferences.saveCredentials(login, password, context)

            if (!AoDParser.login()) {
                showLoginDialog()
                Log.w(javaClass.name, "Login failed, please try again.")
            }
        }.negativeButton {
            Log.i(javaClass.name, "Login canceled, exiting.")
            finish()
        }.show()
    }

    /**
     * start the onboarding activity and finish the main activity
     */
    private fun showOnboarding() {
        startActivity(Intent(this, OnboardingActivity::class.java))
        finish()
    }

    /**
     * Show a fragment on top of the current fragment.
     * The current fragment is replaced and the new one is added
     * to the back stack.
     */
    fun showFragment(fragment: Fragment) {
        supportFragmentManager.commit {
            replace(R.id.nav_host_fragment, fragment, fragment.javaClass.simpleName)
            addToBackStack(fragment.javaClass.name)
            show(fragment)
        }
    }

    /**
     * start the player as new activity
     */
    fun startPlayer(mediaId: Int, episodeId: Int) {
        val intent = Intent(this, PlayerActivity::class.java).apply {
            putExtra(getString(R.string.intent_media_id), mediaId)
            putExtra(getString(R.string.intent_episode_id), episodeId)
        }
        startActivity(intent)
    }

    /**
     * use custom restart instead of recreate(), since it has animations
     */
    fun restart() {
        val restartIntent = intent
        restartIntent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
        finish()
        startActivity(restartIntent)
    }

    /**
     * exit and remove the app from tasks
     */
    fun exitAndRemoveTask() {
        this.finishAndRemoveTask()
        exitProcess(0)
    }

}