package com.pixelized.biblib.ui

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.viewModels
import androidx.compose.animation.Crossfade
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.livedata.observeAsState
import androidx.lifecycle.viewmodel.compose.viewModel
import com.pixelized.biblib.ui.composable.screen.LoginScreenComposable
import com.pixelized.biblib.ui.composable.screen.MainScreenComposable
import com.pixelized.biblib.ui.composable.screen.SplashScreenComposable
import com.pixelized.biblib.ui.theme.BibLibTheme
import com.pixelized.biblib.ui.viewmodel.navigation.INavigationViewModel.Navigable.Screen
import com.pixelized.biblib.ui.viewmodel.navigation.NavigationViewModel

class MainActivity : ComponentActivity() {
    private val navigationViewModel: NavigationViewModel by viewModels()

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

        setContent {
            BibLibTheme {
                ContentComposable()
            }
        }
    }

    override fun onBackPressed() {
        if (navigationViewModel.navigateBack().not()) {
            super.onBackPressed()
        }
    }
}

@Composable
fun ContentComposable() {
    val navigationViewModel = viewModel<NavigationViewModel>()
    val main by navigationViewModel.screen.observeAsState()

    Crossfade(targetState = main) {
        when (it) {
            is Screen.SplashScreen -> SplashScreenComposable()
            is Screen.LoginScreen -> LoginScreenComposable()
            is Screen.MainScreen -> MainScreenComposable()
        }
    }
}