const DBName = "EMI_SOCIAL";
const Post = require("./../def/post.js")

postDB = (DB)=>{
    DB.postCols = DB.db.db(DBName).collection("posts");
    
    DB.newPost = (postObj) => {
        return DB.postCols.insertOne(postObj.toObj()).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.newReaction = (postid, profileid, reaction) => {
        const id = DB.ObjectID(postid);
        let update = {
            $set:{
                ["reactions." + profileid]: reaction,
                lastUpdated: new Date()
            }            
        }
        return DB.postCols.updateOne({_id: id}, update).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.removeReaction = (postid, profileid) => {
        const id = DB.ObjectID(postid);
        let update = {
            $unset:{
                ["reactions." + profileid]: ""
            },
            $set: {
                lastUpdated: new Date()
            }            
        }
        return DB.postCols.updateOne({_id: id}, update).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.bookmarkPost = async (postid, profileId)=>{
        const _id = DB.ObjectID(postid);
        let update = {
            $addToSet:{
                bookmarks: DB.ObjectID(profileId)
            }            
        }
        return DB.postCols.updateOne({_id}, update).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.unbookmarkPost = async (postid, profileId)=>{
        const _id = DB.ObjectID(postid);
        let update = {
            $pull:{
                bookmarks: DB.ObjectID(profileId)
            }            
        }
        return DB.postCols.updateOne({_id}, update).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.newComment = (postid, comment) => {
        const id = DB.ObjectID(postid);
        return DB.postCols.updateOne({_id: id}, {
            $push: {
                comments: comment
            },
            $set: {
                lastUpdated: new Date()
            }
        }).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.newCommentReaction = (postid, commentDate, userid, reaction) => {
        const id = DB.ObjectID(postid);
        let update = {
            $set:{
                ["comments.$.reactions." + userid]: reaction,
                "comments.$.lastUpdated": new Date(),
                lastUpdated: new Date()
            }            
        }
        return DB.postCols.updateOne({
            _id: id,
            "comments.createdAt": commentDate
        }, update).catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.getPosts = (profileId) => {
        let query = {};
        if(profileId) {
            const id = DB.ObjectID(profileId);
            query = {
                $or: [
                    {profileid: id},
                    {toProfile: id}
                ]
            };
        }
        return DB.postCols.find(query).sort({_id: -1}).toArray().catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.getFeed = async (profileId) => {
        const profile = await DB.getProfile(profileId);
        let ids = profile.following.map((id)=>DB.ObjectID(id));
        ids.push(profileId)
        const _id = DB.ObjectID(profileId);
        query = {
            $or: [
                {profileid: {
                    $in: ids
                }},
                {toProfile: {
                    $in: ids
                }}
            ]
        };
        return DB.postCols.find(query).sort({lastUpdated: -1}).limit(20).toArray().catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.getPostsOfUser = (userId) => {
        let userid = DB.ObjectID(userId);
        return DB.postCols.find({userid}).sort({_id: -1}).toArray().catch((err)=>{
            console.log(err);
            return false;
        });
    }

    DB.getPost = (postId) => {
        let _id = DB.ObjectID(postId);
        return DB.postCols.findOne({_id}).catch((err)=>{
            console.log(err);
            return false;
        });
    }
    
}

module.exports = postDB;