Talaria/app/src/main/java/dev/lonami/talaria/TalariaApp.kt

package dev.lonami.talaria

import androidx.annotation.StringRes
import androidx.compose.foundation.layout.padding
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.rememberNavController
import dev.lonami.talaria.ui.ChatScreen
import dev.lonami.talaria.ui.DialogScreen
import dev.lonami.talaria.ui.LoginScreen

enum class TalariaScreen(@StringRes val title: Int) {
    Login(title = R.string.app_name),
    Dialog(title = R.string.dialog),
    Chat(title = R.string.chat),
}

@Composable
fun TalariaAppBar(currentScreen: TalariaScreen, canNavigateBack: Boolean, navigateUp: () -> Unit) {
    TopAppBar(
        title = { Text(stringResource(currentScreen.title)) },
        navigationIcon = {
            if (canNavigateBack) {
                IconButton(onClick = navigateUp) {
                    Icon(
                        imageVector = Icons.Filled.ArrowBack,
                        contentDescription = stringResource(R.string.back_button)
                    )
                }
            }
        }
    )
}

@Composable
fun TalariaApp() {
    val navController = rememberNavController()
    val backStackEntry by navController.currentBackStackEntryAsState()
    val currentScreen =
        TalariaScreen.valueOf(backStackEntry?.destination?.route ?: TalariaScreen.Login.name)

    var selectedDialog by remember { mutableStateOf("") }

    Scaffold(
        topBar = {
            TalariaAppBar(
                currentScreen,
                canNavigateBack = navController.previousBackStackEntry != null,
                navigateUp = { navController.navigateUp() }
            )
        }
    ) { innerPadding ->
        NavHost(
            navController = navController,
            startDestination = TalariaScreen.Login.name,
            Modifier.padding(innerPadding)
        ) {
            composable(route = TalariaScreen.Dialog.name) {
                DialogScreen(onDialogSelected = {
                    selectedDialog = it
                    navController.navigate(TalariaScreen.Chat.name)
                })
            }
            composable(route = TalariaScreen.Chat.name) {
                ChatScreen(selectedDialog)
            }
            composable(route = TalariaScreen.Login.name) {
                LoginScreen(onConfirmOtp = {
                    navController.navigate(TalariaScreen.Dialog.name)
                })
            }
        }
    }
}