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

import MessageKit
import Foundation
import UIKit

extension CryptoChatControllerChat: MessagesDataSource {

    func currentSender() -> SenderType {
        let username = Accounts().current?.name ?? ""
        return Sender(senderId: username, displayName: username)
    }

    func numberOfSections(in messagesCollectionView: MessagesCollectionView) -> Int {
        if loadedMsgsCount == 0 { loadedMsgsCount = min(messages.count, 100) }
        infoView.isHidden = loadedMsgsCount > 0
        return loadedMsgsCount
    }

    func messageHeaderView(for indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageReusableView {
        messagesCollectionView.dequeueReusableHeaderView(InfoHeaderCollectionReusableView.self, for: indexPath)
    }

    func messageForItem(at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageType {
        let messageIndex = self.messages.count - self.loadedMsgsCount + indexPath.section
        if messageIndex > 0,
           messageIndex < self.messages.count {
            return messages[messages.count - loadedMsgsCount + indexPath.section]
        } else {
            return messages[0]
        }
    }

    func messageBottomLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        let msg = messages[messages.count - loadedMsgsCount + indexPath.section]
        if !msg.isInSyncWithBlockchain {
            if (msg.timestamp < self.historyService.lastSyncTimestamp) || (msg.isUnsent == true) {
                return (msg.time.attributed + " • " + L10n.CryptoChat.Chat.notSent.attributed)
                    .applying(attribute: .font, value: FontConvertible.Font.font(style: .regular, size: 12))
                    .applying(attribute: .foregroundColor, value: Asset.textBrick.color.withAlphaComponent(0.6))
            } else {
                return (msg.time.attributed + " • " + L10n.CryptoChat.Chat.sending.attributed)
                    .applying(attribute: .font, value: FontConvertible.Font.font(style: .regular, size: 12))
                    .applying(attribute: .foregroundColor, value: Asset.textDeepWater.color.withAlphaComponent(0.4))
            }
        } else {
            if isFromCurrentSender(message: message) {
                return msg.time.attributed
                    .applying(attribute: .font, value: FontConvertible.Font.font(style: .regular, size: 12))
                    .applying(attribute: .foregroundColor, value: Asset.textDeepWater.color.withAlphaComponent(0.4))
            } else {
                return msg.time.attributed
                    .applying(attribute: .font, value: FontConvertible.Font.font(style: .regular, size: 12))
                    .applying(attribute: .foregroundColor, value: Asset.textPebble.color)
            }
        }
    }

    func cellTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        messages[messages.count - loadedMsgsCount + indexPath.section].day.attributed
            .applying(attribute: .font, value: Font.font(style: .regular, size: 14))
            .applying(attribute: .foregroundColor, value: Asset.textGranite.color)
    }

    func cellBottomLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        L10n.CryptoChat.Chat.unreadMsgs.attributed
            .applying(attribute: .font, value: Font.font(style: .bold, size: 12))
            .applying(attribute: .foregroundColor, value: Asset.textDeepWater.color)
    }
}