2019-06-28 16:16:27 +00:00
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// File created from ScreenTemplate
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// $ createScreen.sh Room/EditHistory EditHistory
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/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import Foundation
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final class EditHistoryViewModel: EditHistoryViewModelType {
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2019-07-01 08:51:07 +00:00
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// MARK: - Constants
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private enum Pagination {
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static let count: UInt = 2
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}
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2019-06-28 16:16:27 +00:00
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// MARK: - Properties
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// MARK: Private
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private let aggregations: MXAggregations
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private let roomId: String
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private let eventId: String
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private let messageFormattingQueue: DispatchQueue
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private var nextBatch: String?
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// MARK: Public
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var messages: [EditHistoryMessage] = []
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var operation: MXHTTPOperation?
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weak var viewDelegate: EditHistoryViewModelViewDelegate?
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weak var coordinatorDelegate: EditHistoryViewModelCoordinatorDelegate?
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// MARK: - Setup
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init(aggregations: MXAggregations,
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roomId: String,
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eventId: String) {
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self.aggregations = aggregations
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self.roomId = roomId
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self.eventId = eventId
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self.messageFormattingQueue = DispatchQueue(label: "\(type(of: self)).messageFormattingQueue")
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}
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deinit {
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}
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// MARK: - Public
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func process(viewAction: EditHistoryViewAction) {
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switch viewAction {
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case .loadMore:
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self.loadMoreHistory()
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case .close:
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self.coordinatorDelegate?.editHistoryViewModelDidClose(self)
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}
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}
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// MARK: - Private
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func loadMoreHistory() {
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if self.operation != nil {
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print("[EditHistoryViewModel] loadMoreHistory: operation already pending")
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return
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}
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self.update(viewState: .loading)
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2019-07-01 08:51:07 +00:00
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self.operation = self.aggregations.replaceEvents(forEvent: self.eventId, inRoom: self.roomId, from: self.nextBatch, limit: Pagination.count, success: { [weak self] (response) in
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2019-06-28 16:16:27 +00:00
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guard let sself = self else {
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return
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}
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sself.nextBatch = response.nextBatch
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sself.operation = nil
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sself.process(editEvents: response.chunk)
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2019-07-01 08:51:07 +00:00
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if sself.nextBatch == nil {
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sself.update(viewState: .allLoaded)
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}
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2019-06-28 16:16:27 +00:00
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}, failure: { [weak self] error in
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guard let sself = self else {
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return
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}
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sself.operation = nil
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sself.update(viewState: .error(error))
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})
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}
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func process(editEvents: [MXEvent]) {
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self.messageFormattingQueue.async {
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let newMessages = editEvents.reversed()
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.compactMap { (editEvent) -> EditHistoryMessage? in
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return self.process(editEvent: editEvent)
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}
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if newMessages.count > 0 {
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DispatchQueue.main.async {
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self.messages = newMessages + self.messages
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self.update(viewState: .loaded(messages: self.messages, addedCount: newMessages.count))
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}
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}
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}
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}
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func process(editEvent: MXEvent) -> EditHistoryMessage? {
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guard let body: String = (editEvent.content?["m.new_content"] as? [String: Any])?["body"] as? String else {
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print("[EditHistoryViewModel] processEditEvent: invalid edit event: \(editEvent.eventId ?? "")")
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return nil
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}
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// TODO: Using MXKEventFormatter
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return EditHistoryMessage(date: Date(), message: NSAttributedString(string: body))
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}
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private func update(viewState: EditHistoryViewState) {
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self.viewDelegate?.editHistoryViewModel(self, didUpdateViewState: viewState)
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}
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}
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