Swiftgram/TelegramCore/RecentlySearchedPeerIds.swift

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

public func addRecentlySearchedPeer(postbox: Postbox, peerId: PeerId) -> Signal<Void, NoError> {
    return postbox.modify { modifier -> Void in
        modifier.addOrMoveToFirstPositionOrderedItemListItem(collectionId: Namespaces.OrderedItemList.RecentlySearchedPeerIds, item: OrderedItemListEntry(id: RecentPeerItemId(peerId).rawValue, contents: RecentPeerItem()), removeTailIfCountExceeds: 20)
    }
}

public func recentlySearchedPeers(postbox: Postbox) -> Signal<[Peer], NoError> {
    return postbox.orderedItemListView(collectionId: Namespaces.OrderedItemList.RecentlySearchedPeerIds)
        |> take(1)
        |> mapToSignal { view -> Signal<[Peer], NoError> in
            return postbox.modify { modifier -> [Peer] in
                var peers: [Peer] = []
                for item in view.items {
                    let peerId = RecentPeerItemId(item.id).peerId
                    if let peer = modifier.getPeer(peerId) {
                        peers.append(peer)
                    }
                }
                return peers
            }
        }
}