121 lines
4.6 KiB
Kotlin
121 lines
4.6 KiB
Kotlin
/* Copyright 2023 Tusky Contributors
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.components.trending.viewmodel
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import android.util.Log
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.viewModelScope
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import at.connyduck.calladapter.networkresult.fold
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import com.keylesspalace.tusky.appstore.EventHub
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import com.keylesspalace.tusky.appstore.PreferenceChangedEvent
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import com.keylesspalace.tusky.entity.Filter
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import com.keylesspalace.tusky.entity.end
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import com.keylesspalace.tusky.entity.start
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import com.keylesspalace.tusky.network.MastodonApi
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import com.keylesspalace.tusky.util.toViewData
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import com.keylesspalace.tusky.viewdata.TrendingViewData
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import kotlinx.coroutines.async
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.MutableStateFlow
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import kotlinx.coroutines.flow.filterIsInstance
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import kotlinx.coroutines.launch
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import java.io.IOException
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import javax.inject.Inject
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class TrendingViewModel @Inject constructor(
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private val mastodonApi: MastodonApi,
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private val eventHub: EventHub
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) : ViewModel() {
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enum class LoadingState {
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INITIAL, LOADING, REFRESHING, LOADED, ERROR_NETWORK, ERROR_OTHER
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}
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data class TrendingUiState(
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val trendingViewData: List<TrendingViewData>,
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val loadingState: LoadingState
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)
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val uiState: Flow<TrendingUiState> get() = _uiState
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private val _uiState = MutableStateFlow(TrendingUiState(listOf(), LoadingState.INITIAL))
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init {
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invalidate()
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// Collect PreferenceChangedEvent, FiltersActivity creates them when a filter is created
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// or deleted. Unfortunately, there's nothing in the event to determine if it's a filter
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// that was modified, so refresh on every preference change.
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viewModelScope.launch {
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eventHub.events
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.filterIsInstance<PreferenceChangedEvent>()
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.collect {
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invalidate()
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}
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}
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}
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/**
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* Invalidate the current list of trending tags and fetch a new list.
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*
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* A tag is excluded if it is filtered by the user on their home timeline.
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*/
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fun invalidate(refresh: Boolean = false) = viewModelScope.launch {
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if (refresh) {
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_uiState.value = TrendingUiState(emptyList(), LoadingState.REFRESHING)
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} else {
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_uiState.value = TrendingUiState(emptyList(), LoadingState.LOADING)
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}
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val deferredFilters = async { mastodonApi.getFilters() }
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mastodonApi.trendingTags().fold(
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{ tagResponse ->
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val firstTag = tagResponse.firstOrNull()
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_uiState.value = if (firstTag == null) {
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TrendingUiState(emptyList(), LoadingState.LOADED)
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} else {
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val homeFilters = deferredFilters.await().getOrNull()?.filter { filter ->
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filter.context.contains(Filter.Kind.HOME.kind)
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}
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val tags = tagResponse
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.filter { tag ->
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homeFilters?.none { filter ->
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filter.keywords.any { keyword -> keyword.keyword.equals(tag.name, ignoreCase = true) }
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} ?: false
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}
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.sortedByDescending { tag -> tag.history.sumOf { it.uses.toLongOrNull() ?: 0 } }
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.toViewData()
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val header = TrendingViewData.Header(firstTag.start(), firstTag.end())
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TrendingUiState(listOf(header) + tags, LoadingState.LOADED)
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}
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},
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{ error ->
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Log.w(TAG, "failed loading trending tags", error)
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if (error is IOException) {
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_uiState.value = TrendingUiState(emptyList(), LoadingState.ERROR_NETWORK)
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} else {
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_uiState.value = TrendingUiState(emptyList(), LoadingState.ERROR_OTHER)
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}
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}
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)
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}
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companion object {
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private const val TAG = "TrendingViewModel"
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}
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}
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