Swiftgram/TelegramCore/PeerLiveLocationsContext.swift

import Foundation
#if os(macOS)
    import PostboxMac
    import SwiftSignalKitMac
#else
    import Postbox
    import SwiftSignalKit
#endif

public func topPeerActiveLiveLocationMessages(viewTracker: AccountViewTracker, peerId: PeerId) -> Signal<[Message], NoError> {
    return viewTracker.aroundMessageHistoryViewForLocation(.peer(peerId), index: .upperBound, anchorIndex: .upperBound, count: 100, fixedCombinedReadStates: nil, tagMask: .liveLocation, orderStatistics: [])
    |> map { (view, _, _) -> [Message] in
        let timestamp = Int32(CFAbsoluteTimeGetCurrent() + kCFAbsoluteTimeIntervalSince1970)
        var result: [Message] = []
        for entry in view.entries {
            if case let .MessageEntry(message, _, _, _) = entry {
                for media in message.media {
                    if let location = media as? TelegramMediaMap, let liveBroadcastingTimeout = location.liveBroadcastingTimeout {
                        if message.timestamp + liveBroadcastingTimeout > timestamp {
                            result.append(message)
                        }
                    } else {
                        assertionFailure()
                    }
                }
            }
        }
        return result
    }
}