raspberry/iOS/Wallet/Sources/CryptoChat/Controllers/CryptoChatControllerChat/+ MessagesLayoutDelegate.swift

//
//  + MessagesLayoutDelegate.swift
//  Wallet
//
//  Created by Saveliy Stavitsky on 2/9/21.
//  Copyright © 2021 AM. All rights reserved.
//

import MessageKit
import Foundation
import UIKit

extension CryptoChatControllerChat: MessagesLayoutDelegate {

    func messageBottomLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        16
    }

    func cellTopLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {

        if indexPath.section == 0 && loadedMsgsCount == messages.count {
            return 32
        }

        // get previous message
        let previousIndexPath = IndexPath(row: 0, section: indexPath.section - 1)
        let previousMessage = messageForItem(at: previousIndexPath, in: messagesCollectionView)

        if Calendar.current.isDate(message.sentDate, inSameDayAs: previousMessage.sentDate) {
            return .zero
        }

        return 32
    }

    func cellBottomLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {

        if unreadCount != 0 && loadedMsgsCount - indexPath.section - 1 == unreadCount {
            return 32
        }

        return .zero
    }

    func headerViewSize(for section: Int, in messagesCollectionView: MessagesCollectionView) -> CGSize {
        if section == 0 && loadedMsgsCount == messages.count {
            return CGSize(width: messagesCollectionView.bounds.width,
                          height: 52 + 12 + infoView.frame.height + 12)
        } else {
            return .zero
        }
    }
}