379 lines
14 KiB
Kotlin
379 lines
14 KiB
Kotlin
/* Copyright 2021 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.timeline.viewmodel
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import android.content.SharedPreferences
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import android.util.Log
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import androidx.lifecycle.viewModelScope
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import androidx.paging.ExperimentalPagingApi
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import androidx.paging.Pager
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import androidx.paging.PagingConfig
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import androidx.paging.cachedIn
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import androidx.paging.filter
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import at.connyduck.calladapter.networkresult.NetworkResult
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import at.connyduck.calladapter.networkresult.map
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import at.connyduck.calladapter.networkresult.onFailure
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import com.keylesspalace.tusky.appstore.EventHub
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import com.keylesspalace.tusky.components.timeline.util.ifExpected
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import com.keylesspalace.tusky.db.AccountManager
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import com.keylesspalace.tusky.entity.Filter
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import com.keylesspalace.tusky.entity.Poll
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import com.keylesspalace.tusky.entity.Status
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import com.keylesspalace.tusky.network.FilterModel
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import com.keylesspalace.tusky.network.MastodonApi
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import com.keylesspalace.tusky.usecase.TimelineCases
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import com.keylesspalace.tusky.util.getDomain
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import com.keylesspalace.tusky.util.isLessThan
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import com.keylesspalace.tusky.util.isLessThanOrEqual
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import com.keylesspalace.tusky.util.toViewData
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import com.keylesspalace.tusky.viewdata.StatusViewData
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import com.keylesspalace.tusky.viewdata.TranslationViewData
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import java.io.IOException
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import javax.inject.Inject
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.asExecutor
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import kotlinx.coroutines.flow.flowOn
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import kotlinx.coroutines.flow.map
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import kotlinx.coroutines.launch
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import retrofit2.HttpException
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import retrofit2.Response
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/**
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* TimelineViewModel that caches all statuses in an in-memory list
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*/
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class NetworkTimelineViewModel @Inject constructor(
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timelineCases: TimelineCases,
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private val api: MastodonApi,
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eventHub: EventHub,
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accountManager: AccountManager,
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sharedPreferences: SharedPreferences,
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filterModel: FilterModel
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) : TimelineViewModel(
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timelineCases,
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api,
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eventHub,
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accountManager,
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sharedPreferences,
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filterModel
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) {
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var currentSource: NetworkTimelinePagingSource? = null
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val statusData: MutableList<StatusViewData> = mutableListOf()
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var nextKey: String? = null
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@OptIn(ExperimentalPagingApi::class)
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override val statuses = Pager(
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config = PagingConfig(pageSize = LOAD_AT_ONCE),
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pagingSourceFactory = {
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NetworkTimelinePagingSource(
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viewModel = this
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).also { source ->
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currentSource = source
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}
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},
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remoteMediator = NetworkTimelineRemoteMediator(accountManager, this)
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).flow
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.map { pagingData ->
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pagingData.filter(Dispatchers.Default.asExecutor()) { statusViewData ->
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shouldFilterStatus(statusViewData) != Filter.Action.HIDE
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}
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}
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.flowOn(Dispatchers.Default)
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.cachedIn(viewModelScope)
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override fun updatePoll(newPoll: Poll, status: StatusViewData.Concrete) {
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status.copy(
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status = status.status.copy(poll = newPoll)
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).update()
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}
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override fun changeExpanded(expanded: Boolean, status: StatusViewData.Concrete) {
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status.copy(
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isExpanded = expanded
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).update()
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}
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override fun changeContentShowing(isShowing: Boolean, status: StatusViewData.Concrete) {
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status.copy(
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isShowingContent = isShowing
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).update()
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}
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override fun changeContentCollapsed(isCollapsed: Boolean, status: StatusViewData.Concrete) {
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status.copy(
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isCollapsed = isCollapsed
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).update()
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}
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override fun removeAllByAccountId(accountId: String) {
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statusData.removeAll { vd ->
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val status = vd.asStatusOrNull()?.status ?: return@removeAll false
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status.account.id == accountId || status.actionableStatus.account.id == accountId
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}
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currentSource?.invalidate()
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}
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override fun removeAllByInstance(instance: String) {
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statusData.removeAll { vd ->
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val status = vd.asStatusOrNull()?.status ?: return@removeAll false
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getDomain(status.account.url) == instance
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}
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currentSource?.invalidate()
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}
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override fun removeStatusWithId(id: String) {
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statusData.removeAll { vd ->
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val status = vd.asStatusOrNull()?.status ?: return@removeAll false
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status.id == id || status.reblog?.id == id
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}
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currentSource?.invalidate()
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}
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override fun loadMore(placeholderId: String) {
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viewModelScope.launch {
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try {
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val placeholderIndex =
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statusData.indexOfFirst { it is StatusViewData.Placeholder && it.id == placeholderId }
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statusData[placeholderIndex] =
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StatusViewData.Placeholder(placeholderId, isLoading = true)
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val idAbovePlaceholder = statusData.getOrNull(placeholderIndex - 1)?.id
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val statusResponse = fetchStatusesForKind(
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fromId = idAbovePlaceholder,
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uptoId = null,
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limit = 20
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)
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val statuses = statusResponse.body()
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if (!statusResponse.isSuccessful || statuses == null) {
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loadMoreFailed(placeholderId, HttpException(statusResponse))
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return@launch
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}
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statusData.removeAt(placeholderIndex)
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val activeAccount = accountManager.activeAccount!!
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val data: MutableList<StatusViewData> = statuses.map { status ->
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status.toViewData(
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isShowingContent = activeAccount.alwaysShowSensitiveMedia || !status.actionableStatus.sensitive,
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isExpanded = activeAccount.alwaysOpenSpoiler,
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isCollapsed = true
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)
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}.toMutableList()
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if (statuses.isNotEmpty()) {
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val firstId = statuses.first().id
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val lastId = statuses.last().id
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val overlappedFrom = statusData.indexOfFirst {
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it.asStatusOrNull()?.id?.isLessThanOrEqual(firstId) ?: false
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}
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val overlappedTo = statusData.indexOfFirst {
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it.asStatusOrNull()?.id?.isLessThan(lastId) ?: false
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}
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if (overlappedFrom < overlappedTo) {
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data.mapIndexed { i, status ->
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i to statusData.firstOrNull {
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it.asStatusOrNull()?.id == status.id
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}?.asStatusOrNull()
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}
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.filter { (_, oldStatus) -> oldStatus != null }
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.forEach { (i, oldStatus) ->
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data[i] = data[i].asStatusOrNull()!!
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.copy(
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isShowingContent = oldStatus!!.isShowingContent,
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isExpanded = oldStatus.isExpanded,
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isCollapsed = oldStatus.isCollapsed
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)
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}
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statusData.removeAll { status ->
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when (status) {
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is StatusViewData.Placeholder -> lastId.isLessThan(status.id) && status.id.isLessThanOrEqual(
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firstId
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)
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is StatusViewData.Concrete -> lastId.isLessThan(status.id) && status.id.isLessThanOrEqual(
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firstId
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)
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}
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}
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} else {
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data[data.size - 1] =
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StatusViewData.Placeholder(statuses.last().id, isLoading = false)
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}
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}
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statusData.addAll(placeholderIndex, data)
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currentSource?.invalidate()
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} catch (e: Exception) {
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ifExpected(e) {
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loadMoreFailed(placeholderId, e)
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}
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}
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}
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}
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private fun loadMoreFailed(placeholderId: String, e: Exception) {
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Log.w("NetworkTimelineVM", "failed loading statuses", e)
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val index =
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statusData.indexOfFirst { it is StatusViewData.Placeholder && it.id == placeholderId }
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statusData[index] = StatusViewData.Placeholder(placeholderId, isLoading = false)
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currentSource?.invalidate()
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}
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override fun handleStatusChangedEvent(status: Status) {
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updateStatusById(status.id) { oldViewData ->
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status.toViewData(
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isShowingContent = oldViewData.isShowingContent,
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isExpanded = oldViewData.isExpanded,
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isCollapsed = oldViewData.isCollapsed
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)
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}
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}
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override fun fullReload() {
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nextKey = statusData.firstOrNull { it is StatusViewData.Concrete }?.asStatusOrNull()?.id
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statusData.clear()
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currentSource?.invalidate()
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}
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override fun clearWarning(status: StatusViewData.Concrete) {
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updateActionableStatusById(status.id) {
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it.copy(filtered = emptyList())
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}
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}
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override fun saveReadingPosition(statusId: String) {
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/** Does nothing for non-cached timelines */
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}
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override suspend fun invalidate() {
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currentSource?.invalidate()
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}
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override suspend fun translate(status: StatusViewData.Concrete): NetworkResult<Unit> {
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status.copy(translation = TranslationViewData.Loading).update()
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return timelineCases.translate(status.actionableId)
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.map { translation ->
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status.copy(translation = TranslationViewData.Loaded(translation)).update()
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}
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.onFailure {
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status.update()
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}
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}
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override fun untranslate(status: StatusViewData.Concrete) {
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status.copy(translation = null).update()
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}
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@Throws(IOException::class, HttpException::class)
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suspend fun fetchStatusesForKind(
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fromId: String?,
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uptoId: String?,
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limit: Int
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): Response<List<Status>> {
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return when (kind) {
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Kind.HOME -> api.homeTimeline(maxId = fromId, sinceId = uptoId, limit = limit)
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Kind.PUBLIC_FEDERATED -> api.publicTimeline(null, fromId, uptoId, limit)
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Kind.PUBLIC_LOCAL -> api.publicTimeline(true, fromId, uptoId, limit)
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Kind.TAG -> {
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val firstHashtag = tags[0]
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val additionalHashtags = tags.subList(1, tags.size)
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api.hashtagTimeline(firstHashtag, additionalHashtags, null, fromId, uptoId, limit)
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}
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Kind.USER -> api.accountStatuses(
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id!!,
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fromId,
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uptoId,
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limit,
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excludeReplies = true,
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onlyMedia = null,
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pinned = null
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)
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Kind.USER_PINNED -> api.accountStatuses(
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id!!,
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fromId,
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uptoId,
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limit,
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excludeReplies = null,
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onlyMedia = null,
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pinned = true
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)
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Kind.USER_WITH_REPLIES -> api.accountStatuses(
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id!!,
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fromId,
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uptoId,
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limit,
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excludeReplies = null,
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onlyMedia = null,
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pinned = null
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)
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Kind.FAVOURITES -> api.favourites(fromId, uptoId, limit)
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Kind.BOOKMARKS -> api.bookmarks(fromId, uptoId, limit)
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Kind.LIST -> api.listTimeline(id!!, fromId, uptoId, limit)
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Kind.PUBLIC_TRENDING_STATUSES -> api.trendingStatuses(limit = limit, offset = fromId)
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}
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}
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private fun StatusViewData.Concrete.update() {
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val position =
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statusData.indexOfFirst { viewData -> viewData.asStatusOrNull()?.id == this.id }
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statusData[position] = this
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currentSource?.invalidate()
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}
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private inline fun updateStatusById(
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id: String,
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updater: (StatusViewData.Concrete) -> StatusViewData.Concrete
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) {
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val pos = statusData.indexOfFirst { it.asStatusOrNull()?.id == id }
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if (pos == -1) return
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updateViewDataAt(pos, updater)
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}
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private inline fun updateActionableStatusById(id: String, updater: (Status) -> Status) {
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val pos = statusData.indexOfFirst { it.asStatusOrNull()?.id == id }
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if (pos == -1) return
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updateViewDataAt(pos) { vd ->
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if (vd.status.reblog != null) {
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vd.copy(status = vd.status.copy(reblog = updater(vd.status.reblog)))
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} else {
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vd.copy(status = updater(vd.status))
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}
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}
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}
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private inline fun updateViewDataAt(
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position: Int,
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updater: (StatusViewData.Concrete) -> StatusViewData.Concrete
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) {
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val status = statusData.getOrNull(position)?.asStatusOrNull() ?: return
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statusData[position] = updater(status)
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currentSource?.invalidate()
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}
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}
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