teapod/app/src/main/java/org/mosad/teapod/MainActivity.kt

package org.mosad.teapod

import android.os.Bundle
import android.view.MenuItem
import com.google.android.material.bottomnavigation.BottomNavigationView
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.Fragment
import androidx.fragment.app.commit
import kotlinx.android.synthetic.main.activity_main.*
import org.mosad.teapod.parser.AoDParser
import org.mosad.teapod.ui.MediaFragment
import org.mosad.teapod.ui.account.AccountFragment
import org.mosad.teapod.ui.home.HomeFragment
import org.mosad.teapod.ui.library.LibraryFragment
import org.mosad.teapod.ui.search.SearchFragment
import org.mosad.teapod.util.GUIMedia

class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener {

    private var activeFragment: Fragment = HomeFragment() // the currently active fragment, home at the start

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val navView: BottomNavigationView = findViewById(R.id.nav_view)
        navView.setOnNavigationItemSelectedListener(this)

        load()
    }

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

    override fun onNavigationItemSelected(item: MenuItem): Boolean {
        val ret = when (item.itemId) {
            R.id.navigation_home -> {
                activeFragment = HomeFragment()
                true
            }
            R.id.navigation_library -> {
                activeFragment = LibraryFragment()
                true
            }
            R.id.navigation_search -> {
                activeFragment = SearchFragment()
                true
            }
            R.id.navigation_account -> {
                activeFragment = AccountFragment()
                true
            }
            else -> false
        }

        supportFragmentManager.commit {
            replace(R.id.nav_host_fragment, activeFragment)
        }

        return ret
    }

    private fun load() {
        // TODO
    }

    fun showDetailFragment(media: GUIMedia) {
        val streams = AoDParser().loadStreams(media.link) // load the streams for the selected media

        val mediaFragment = MediaFragment(media, streams)
        supportFragmentManager.commit {
            add(R.id.nav_host_fragment, mediaFragment, "MediaFragment")
            addToBackStack(null)
            show(mediaFragment)
        }

        println("visible !!!: " + mediaFragment.isVisible)
        println(supportFragmentManager.backStackEntryCount)
    }
}