bitwarden-android/app/src/main/java/com/x8bit/bitwarden/MainViewModel.kt

package com.x8bit.bitwarden

import android.content.Intent
import android.os.Parcelable
import androidx.lifecycle.viewModelScope
import com.x8bit.bitwarden.data.auth.repository.AuthRepository
import com.x8bit.bitwarden.data.auth.repository.util.getCaptchaCallbackTokenResult
import com.x8bit.bitwarden.data.platform.repository.SettingsRepository
import com.x8bit.bitwarden.ui.platform.base.BaseViewModel
import com.x8bit.bitwarden.ui.platform.feature.settings.appearance.model.AppTheme
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.flow.launchIn
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.flow.update
import kotlinx.parcelize.Parcelize
import javax.inject.Inject

/**
 * A view model that helps launch actions for the [MainActivity].
 */
@HiltViewModel
class MainViewModel @Inject constructor(
    private val authRepository: AuthRepository,
    settingsRepository: SettingsRepository,
) : BaseViewModel<MainState, Unit, MainAction>(
    MainState(
        theme = settingsRepository.appTheme,
    ),
) {
    init {
        settingsRepository
            .appThemeStateFlow
            .onEach { trySendAction(MainAction.Internal.ThemeUpdate(it)) }
            .launchIn(viewModelScope)
    }

    override fun handleAction(action: MainAction) {
        when (action) {
            is MainAction.Internal.ThemeUpdate -> handleAppThemeUpdated(action)
            is MainAction.ReceiveNewIntent -> handleNewIntentReceived(action)
        }
    }

    private fun handleAppThemeUpdated(action: MainAction.Internal.ThemeUpdate) {
        mutableStateFlow.update { it.copy(theme = action.theme) }
    }

    private fun handleNewIntentReceived(action: MainAction.ReceiveNewIntent) {
        val captchaCallbackTokenResult = action.intent.getCaptchaCallbackTokenResult()
        when {
            captchaCallbackTokenResult != null -> {
                authRepository.setCaptchaCallbackTokenResult(
                    tokenResult = captchaCallbackTokenResult,
                )
            }

            else -> Unit
        }
    }
}

/**
 * Models state for the [MainActivity].
 */
@Parcelize
data class MainState(
    val theme: AppTheme,
) : Parcelable

/**
 * Models actions for the [MainActivity].
 */
sealed class MainAction {
    /**
     * Receive Intent by the application.
     */
    data class ReceiveNewIntent(val intent: Intent) : MainAction()

    /**
     * Actions for internal use by the ViewModel.
     */
    sealed class Internal : MainAction() {
        /**
         * Indicates that the app theme has changed.
         */
        data class ThemeUpdate(
            val theme: AppTheme,
        ) : Internal()
    }
}