/*
 * Copyright (c) 2022 New Vector Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package im.vector.app.features.location.live.map

import com.airbnb.mvrx.MavericksViewModelFactory
import dagger.assisted.Assisted
import dagger.assisted.AssistedFactory
import dagger.assisted.AssistedInject
import im.vector.app.core.di.MavericksAssistedViewModelFactory
import im.vector.app.core.di.hiltMavericksViewModelFactory
import im.vector.app.core.platform.VectorViewModel
import im.vector.app.features.location.LocationSharingServiceConnection
import kotlinx.coroutines.flow.launchIn
import kotlinx.coroutines.flow.onEach

class LocationLiveMapViewModel @AssistedInject constructor(
        @Assisted private val initialState: LocationLiveMapViewState,
        getListOfUserLiveLocationUseCase: GetListOfUserLiveLocationUseCase,
        private val locationSharingServiceConnection: LocationSharingServiceConnection,
) : VectorViewModel<LocationLiveMapViewState, LocationLiveMapAction, LocationLiveMapViewEvents>(initialState), LocationSharingServiceConnection.Callback {

    @AssistedFactory
    interface Factory : MavericksAssistedViewModelFactory<LocationLiveMapViewModel, LocationLiveMapViewState> {
        override fun create(initialState: LocationLiveMapViewState): LocationLiveMapViewModel
    }

    companion object : MavericksViewModelFactory<LocationLiveMapViewModel, LocationLiveMapViewState> by hiltMavericksViewModelFactory()

    init {
        getListOfUserLiveLocationUseCase.execute(initialState.roomId)
                .onEach { setState { copy(userLocations = it) } }
                .launchIn(viewModelScope)
        locationSharingServiceConnection.bind(this)
    }

    override fun handle(action: LocationLiveMapAction) {
        when (action) {
            is LocationLiveMapAction.AddMapSymbol -> handleAddMapSymbol(action)
            is LocationLiveMapAction.RemoveMapSymbol -> handleRemoveMapSymbol(action)
            LocationLiveMapAction.StopSharing -> handleStopSharing()
        }
    }

    private fun handleAddMapSymbol(action: LocationLiveMapAction.AddMapSymbol) = withState { state ->
        val newMapSymbolIds = state.mapSymbolIds.toMutableMap().apply { set(action.key, action.value) }
        setState {
            copy(mapSymbolIds = newMapSymbolIds)
        }
    }

    private fun handleRemoveMapSymbol(action: LocationLiveMapAction.RemoveMapSymbol) = withState { state ->
        val newMapSymbolIds = state.mapSymbolIds.toMutableMap().apply { remove(action.key) }
        setState {
            copy(mapSymbolIds = newMapSymbolIds)
        }
    }

    private fun handleStopSharing() {
        locationSharingServiceConnection.stopLiveLocationSharing(initialState.roomId)
    }

    override fun onLocationServiceRunning() {
        // NOOP
    }

    override fun onLocationServiceStopped() {
        // NOOP
    }
}
