package agzam.vyatsu

import agzam.vyatsu.di.AppContainer
import agzam.vyatsu.ui.groups.GroupPickerScreen
import agzam.vyatsu.ui.groups.GroupPickerViewModel
import agzam.vyatsu.ui.home.HomeScreen
import agzam.vyatsu.ui.schedule.ScheduleViewModel
import agzam.vyatsu.ui.settings.UpdateViewModel
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.ui.platform.LocalContext
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.viewmodel.compose.viewModel

@Composable
fun AppRoot() {
    val app = LocalContext.current.applicationContext as VyatsuApplication
    val container = app.container

    val scheduleViewModel: ScheduleViewModel = viewModel(factory = scheduleFactory(container))
    val groupPickerViewModel: GroupPickerViewModel = viewModel(factory = groupPickerFactory(container))
    val updateViewModel: UpdateViewModel = viewModel(factory = updateFactory(container))

    val state by scheduleViewModel.uiState.collectAsState()
    val showFirstRunDialog by updateViewModel.showFirstRunDialog.collectAsState()

    if (showFirstRunDialog) {
        AlertDialog(
            onDismissRequest = { updateViewModel.onFirstRunDecision(false) },
            title = { Text("Автоматические обновления") },
            text = {
                Text(
                    "Разрешить автоматически проверять и устанавливать " +
                        "новые версии приложения?"
                )
            },
            confirmButton = {
                TextButton(onClick = { updateViewModel.onFirstRunDecision(true) }) {
                    Text("Разрешить")
                }
            },
            dismissButton = {
                TextButton(onClick = { updateViewModel.onFirstRunDecision(false) }) {
                    Text("Не надо")
                }
            }
        )
    }

    if (state.noGroup) {
        GroupPickerScreen(
            viewModel = groupPickerViewModel,
            onGroupPicked = { group -> scheduleViewModel.selectGroup(group.id) }
        )
        return
    }
    HomeScreen(
        scheduleViewModel = scheduleViewModel,
        updateViewModel = updateViewModel,
        onSwitchGroup = { scheduleViewModel.switchGroup() }
    )
}

private class SimpleFactory<T : ViewModel>(private val create: () -> T) : ViewModelProvider.Factory {
    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel> create(modelClass: Class<T>): T = create() as T
}

private fun scheduleFactory(c: AppContainer): ViewModelProvider.Factory = SimpleFactory { ScheduleViewModel(c.scheduleRepository, c.preferencesRepository, c.groupRepository) }
private fun groupPickerFactory(c: AppContainer): ViewModelProvider.Factory = SimpleFactory { GroupPickerViewModel(c.groupRepository) }
private fun updateFactory(c: AppContainer): ViewModelProvider.Factory = SimpleFactory { UpdateViewModel(c.appUpdater, c.preferencesRepository) }