import { Window } from './window';

export class MessageCounter
{
    public static formatUnreadMessagesTotal(totalUnreadMessages: number): string
    {
        if (totalUnreadMessages > 0){

            if (totalUnreadMessages > 99) 
                return  "99+";
            else
                return String(totalUnreadMessages); 
        }

        // Empty fallback.
        return "";
    }

    /**
     * Returns a formatted string containing the total unread messages of a chat window.
     * @param window The window instance to count the unread total messages.
     * @param currentUserId The current chat instance user id. In this context it would be the sender.
     */
    public static unreadMessagesTotal(window: Window, currentUserId: any): string
    {
        let totalUnreadMessages = 0;

        if (window){
            totalUnreadMessages = window.messages.filter(x => x.fromId != currentUserId && !x.dateSeen).length;
        }
            
        return MessageCounter.formatUnreadMessagesTotal(totalUnreadMessages);
    }
}