2021-04-06 09:25:04 +02:00
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//
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// SearchViewModel+LoadOldestState.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/4/6.
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//
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import Foundation
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import GameplayKit
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import MastodonSDK
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import os.log
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extension SearchViewModel {
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class LoadOldestState: GKState {
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weak var viewModel: SearchViewModel?
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init(viewModel: SearchViewModel) {
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self.viewModel = viewModel
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}
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override func didEnter(from previousState: GKState?) {
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os_log("%{public}s[%{public}ld], %{public}s: enter %s, previous: %s", (#file as NSString).lastPathComponent, #line, #function, debugDescription, previousState.debugDescription)
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viewModel?.loadOldestStateMachinePublisher.send(self)
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}
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}
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}
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extension SearchViewModel.LoadOldestState {
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class Initial: SearchViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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guard let viewModel = viewModel else { return false }
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guard viewModel.searchResult.value != nil else { return false }
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return stateClass == Loading.self
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}
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}
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class Loading: SearchViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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stateClass == Fail.self || stateClass == Idle.self || stateClass == NoMore.self
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
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guard let activeMastodonAuthenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
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assertionFailure()
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stateMachine.enter(Fail.self)
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return
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}
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guard let oldSearchResult = viewModel.searchResult.value else {
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stateMachine.enter(Fail.self)
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return
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}
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var offset = 0
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switch viewModel.searchScope.value {
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2021-04-07 15:42:43 +02:00
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case Mastodon.API.Search.SearchType.accounts:
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2021-04-06 09:25:04 +02:00
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offset = oldSearchResult.accounts.count
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2021-04-07 15:42:43 +02:00
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case Mastodon.API.Search.SearchType.hashtags:
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2021-04-06 09:25:04 +02:00
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offset = oldSearchResult.hashtags.count
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default:
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return
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}
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2021-04-07 15:42:43 +02:00
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let query = Mastodon.API.Search.Query(q: viewModel.searchText.value,
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type: viewModel.searchScope.value,
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accountID: nil,
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2021-04-06 09:25:04 +02:00
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maxID: nil,
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minID: nil,
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excludeUnreviewed: nil,
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resolve: nil,
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limit: nil,
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offset: offset,
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following: nil)
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2021-04-07 15:42:43 +02:00
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2021-04-06 09:25:04 +02:00
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viewModel.context.apiService.search(domain: activeMastodonAuthenticationBox.domain, query: query, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
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.sink { completion in
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switch completion {
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case .failure(let error):
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os_log("%{public}s[%{public}ld], %{public}s: load oldest search failed. %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
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case .finished:
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// handle isFetchingLatestTimeline in fetch controller delegate
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break
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}
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} receiveValue: { result in
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switch viewModel.searchScope.value {
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2021-04-07 15:42:43 +02:00
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case Mastodon.API.Search.SearchType.accounts:
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2021-04-06 09:25:04 +02:00
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if result.value.accounts.isEmpty {
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stateMachine.enter(NoMore.self)
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} else {
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var newAccounts = [Mastodon.Entity.Account]()
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newAccounts.append(contentsOf: oldSearchResult.accounts)
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newAccounts.append(contentsOf: result.value.accounts)
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2021-04-08 06:22:05 +02:00
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newAccounts.removeDuplicates()
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viewModel.searchResult.value = Mastodon.Entity.SearchResult(accounts: newAccounts, statuses: oldSearchResult.statuses, hashtags: oldSearchResult.hashtags)
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2021-04-06 09:25:04 +02:00
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stateMachine.enter(Idle.self)
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}
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2021-04-07 15:42:43 +02:00
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case Mastodon.API.Search.SearchType.hashtags:
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2021-04-06 09:25:04 +02:00
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if result.value.hashtags.isEmpty {
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stateMachine.enter(NoMore.self)
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} else {
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var newTags = [Mastodon.Entity.Tag]()
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newTags.append(contentsOf: oldSearchResult.hashtags)
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newTags.append(contentsOf: result.value.hashtags)
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2021-04-08 06:22:05 +02:00
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newTags.removeDuplicates()
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viewModel.searchResult.value = Mastodon.Entity.SearchResult(accounts: oldSearchResult.accounts, statuses: oldSearchResult.statuses, hashtags: newTags)
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2021-04-06 09:25:04 +02:00
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stateMachine.enter(Idle.self)
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}
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default:
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return
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}
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}
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.store(in: &viewModel.disposeBag)
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}
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}
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class Fail: SearchViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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stateClass == Loading.self || stateClass == Idle.self
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}
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}
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class Idle: SearchViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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stateClass == Loading.self
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}
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}
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class NoMore: SearchViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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// reset state if needs
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stateClass == Idle.self
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}
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override func didEnter(from previousState: GKState?) {
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guard let viewModel = viewModel else { return }
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guard let diffableDataSource = viewModel.searchResultDiffableDataSource else {
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assertionFailure()
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return
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}
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2021-04-15 06:35:40 +02:00
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DispatchQueue.main.async {
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var snapshot = diffableDataSource.snapshot()
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snapshot.deleteItems([.bottomLoader])
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diffableDataSource.apply(snapshot)
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}
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2021-04-06 09:25:04 +02:00
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}
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}
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}
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