package world.respect.shared.viewmodel.person.manageaccount

import androidx.lifecycle.SavedStateHandle
import androidx.lifecycle.viewModelScope
import androidx.navigation.toRoute
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch
import kotlinx.serialization.json.Json
import org.koin.core.component.KoinScopeComponent
import org.koin.core.component.inject
import org.koin.core.scope.Scope
import world.respect.credentials.passkey.CheckPasskeySupportUseCase
import world.respect.credentials.passkey.CreatePasskeyUseCase
import world.respect.datalayer.DataLoadState
import world.respect.datalayer.DataLoadingState
import world.respect.datalayer.SchoolDataSource
import world.respect.datalayer.ext.dataOrNull
import world.respect.datalayer.school.adapters.toPersonPasskey
import world.respect.datalayer.school.findByPersonGuidAsFlow
import world.respect.datalayer.school.model.PersonPassword
import world.respect.shared.domain.account.RespectSessionAndPerson
import world.respect.shared.domain.account.RespectAccountManager
import world.respect.shared.domain.getdeviceinfo.GetDeviceInfoUseCase
import world.respect.shared.domain.getdeviceinfo.toUserFriendlyString
import world.respect.shared.generated.resources.Res
import world.respect.shared.generated.resources.manage_account
import world.respect.shared.navigation.ChangePassword
import world.respect.shared.navigation.HowPasskeyWorks
import world.respect.shared.navigation.ManageAccount
import world.respect.shared.navigation.NavCommand
import world.respect.shared.navigation.PasskeyList
import world.respect.shared.resources.StringUiText
import world.respect.shared.resources.UiText
import world.respect.shared.util.ext.asUiText
import world.respect.shared.viewmodel.RespectViewModel

data class ManageAccountUiState(
    val accountGuid: String = "",
    val passkeyCount: Int? = null,
    val passkeySupported: Boolean = false,
    val personUsername: String = "",
    val personPassword: DataLoadState<PersonPassword> = DataLoadingState(),
    val errorText: UiText? = null,
    val selectedAccount: RespectSessionAndPerson? = null,
) {

    val showCreatePasskey: Boolean
        get() = passkeyCount == 0 && passkeySupported &&
                selectedAccount?.person?.guid == accountGuid

    val showManagePasskey: Boolean
        get() = passkeyCount != null && passkeyCount > 0

}

class ManageAccountViewModel(
    savedStateHandle: SavedStateHandle,
    private val accountManager: RespectAccountManager,
    private val getDeviceInfoUseCase: GetDeviceInfoUseCase,
    private val json: Json,
) : RespectViewModel(savedStateHandle), KoinScopeComponent {

    override val scope: Scope = accountManager.requireActiveAccountScope()

    private val checkPasskeySupportUseCase: CheckPasskeySupportUseCase by lazy {
        scope.get()
    }

    private val createPasskeyUseCase: CreatePasskeyUseCase? by lazy {
        scope.getOrNull()
    }

    private val schoolDataSource: SchoolDataSource by inject()

    private val route: ManageAccount = savedStateHandle.toRoute()

    private val personGuid = route.guid

    private val _uiState = MutableStateFlow(
        ManageAccountUiState(
            accountGuid = personGuid
        )
    )

    val uiState = _uiState.asStateFlow()


    init {
        _appUiState.update { prev ->
            prev.copy(
                userAccountIconVisible = false,
                navigationVisible = false,
                title = Res.string.manage_account.asUiText()
            )
        }

        viewModelScope.launch {
            schoolDataSource.personPasswordDataSource.findByPersonGuidAsFlow(
                route.guid
            ).collect { password ->
                _uiState.update { it.copy(personPassword = password) }
            }
        }

        viewModelScope.launch {
            _uiState.takeIf { checkPasskeySupportUseCase() }?.update { prev ->
                prev.copy(
                    passkeySupported = true
                )
            }
        }

        viewModelScope.launch {
            launch {
                schoolDataSource.personPasskeyDataSource.listAllAsFlow().collect {
                    _uiState.update { prev ->
                        prev.copy(
                            passkeyCount = it.dataOrNull()?.size ?: 0,
                        )
                    }
                }
            }

            launch {
                schoolDataSource.personDataSource.findByGuidAsFlow(
                    route.guid
                ).collect {
                    _uiState.update { prev ->
                        prev.copy(personUsername = it.dataOrNull()?.username ?: "")
                    }
                }
            }
        }

        viewModelScope.launch {
            accountManager.selectedAccountAndPersonFlow.collect { accountAndPerson ->
                _uiState.update { prev ->
                    prev.copy(selectedAccount = accountAndPerson)
                }
            }
        }

        _uiState.update { prev ->
            prev.copy(
                passkeySupported = (createPasskeyUseCase != null &&
                        accountManager.activeAccount?.userGuid == personGuid),
            )
        }
    }

    fun onClickChangePassword() {
        _navCommandFlow.tryEmit(
            NavCommand.Navigate(
                ChangePassword(guid = route.guid)
            )
        )
    }

    fun onClickManagePasskey() {
        _navCommandFlow.tryEmit(
            NavCommand.Navigate(
                PasskeyList(
                    guid = route.guid
                )
            )
        )
    }

    fun onClickHowPasskeysWork() {
        _navCommandFlow.tryEmit(
            NavCommand.Navigate(HowPasskeyWorks)
        )
    }

    fun onCreatePasskeyClick() {
        viewModelScope.launch {
            val passkeyCreated = createPasskeyUseCase?.invoke(
                CreatePasskeyUseCase.Request(
                    personUid = uiState.value.selectedAccount?.person?.guid ?: return@launch,
                    username = uiState.value.selectedAccount?.person?.username ?: return@launch,
                    rpId = uiState.value.selectedAccount?.session?.account?.school?.rpId ?: return@launch
                )
            )

            if (passkeyCreated != null) {
                when (passkeyCreated) {
                    is CreatePasskeyUseCase.PasskeyCreatedResult -> {
                        schoolDataSource.personPasskeyDataSource.store(
                            listOf(
                                passkeyCreated.toPersonPasskey(
                                    json = json,
                                    personGuid = personGuid,
                                    deviceName = getDeviceInfoUseCase().toUserFriendlyString(),
                                )
                            )
                        )
                    }

                    is CreatePasskeyUseCase.Error -> {
                        _uiState.update { prev ->
                            prev.copy(
                                errorText = StringUiText(passkeyCreated.message ?: ""),
                            )
                        }
                    }

                    is CreatePasskeyUseCase.UserCanceledResult -> {
                        //do nothing
                    }
                }
            }

        }
    }

}