class Post {
    constructor(info){
        if(!info || !info.userid) throw "Can not construct empty posts"
        this.userid = info.userid;
        this.content = info.content;
        this.createdAt = info.createdAt || new Date();
        this.reactions = info.reactions || {};
        this.comments = info.comments || [];
        //This should record edits
        this.contentHistory = info.contentHistory || []; 
        // Any reaction or comment updates this ts,
        // this will be used as index to query new posts
        this.lastUpdated = info.lastUpdated || this.createdAt;
    }

    addComment(comment){
        this.comments.push(comment);
        this.lastUpdated = new Date();
    }

    addReaction(reaction){
        if(this.reactions[reaction.userid] && 
           this.reactions[reaction.userid].type === reaction.type){
            delete this.reactions[reaction.userid]
        }
        else{
            this.reactions[reaction.userid] = reaction;
        }
        this.lastUpdated = new Date();
    }

    toObj=function(){
        let r = {}
        r.userid = this.userid;
        r.content = this.content;
        r.createdAt = this.createdAt;
        r.reactions = this.reactions;
        r.comments = this.comments;
        r.contentHistory = this.contentHistory;
        r.lastUpdated = this.lastUpdated;
        return r;
    }
}

module.exports = Post;