var express = require('express')
var router = express.Router()

const DB = require("./../mongoDB.js");
const Post = require("./../def/post.js");
const Notifications = require("./../notifications.js");

DB.getDB.then((DB) => {

    const getProfileId = (req) => {
        return DB.ObjectID(req.cookies.profile_id || req.query.profile_id || req.body.profile_id);
    };

    const postBelongToProfile = (post, profileid) => {
        if (!post) return false;
        return post.profileid == profileid;
    };

    const generateNonOrganicPosts = async (req, profileid) => {
        let posts = [];
        // News Posts
        const newsPosts = await DB.getNews();
        posts.push(...newsPosts);

        // Popular Profiles
        const popularProfiles = await DB.getPopularProfiles(5);
        content = "Active users to follow:\n";
        popularProfiles.forEach((p) => {
            content += "@p:" + p._id + "\n";
        });
        let popularProfilesPost = new Post({ profileid: 1, content, nonOrganicType: "PopularUsers" });
        posts.push(popularProfilesPost);

        // Popular Groups
        const popularGroups = await DB.getPopularGroups(5);
        content = "Popular groups to follow:\n";
        popularGroups.forEach((p) => {
            content += "@p:" + p._id + "\n";
        });
        let popularGroupsPost = new Post({ profileid: 1, content, nonOrganicType: "PopularGroups" });
        posts.push(popularGroupsPost);

        const yourFollowsInterests = await DB.getFriendsFriends(profileid);
        content = "People your follow has these interests:\n";
        yourFollowsInterests.forEach((p) => {
            content += "@p:" + p + "\n";
        });
        let yourFollowsInterestsPost = new Post({ profileid: 1, content, nonOrganicType: "PopularUsers" });
        posts.push(yourFollowsInterestsPost);

        return posts;
    };

    const mergePosts = (organic, nonOrganic) => {
        if (!organic || organic.length < 5) return nonOrganic;
        //organic.push(...nonOrganic);
        let mergedPosts = [];
        while (organic.length + nonOrganic.length) {
            if (organic.length == 0) {
                mergedPosts.push(nonOrganic.shift());
                continue;
            }
            if (nonOrganic.length == 0) {
                mergedPosts.push(organic.shift());
                continue;
            }
            if (nonOrganic[0].nonOrganicType == 'News') {
                mergedPosts.push(nonOrganic.shift());
                continue;
            }
            if (Math.random() < 0.2) {
                mergedPosts.push(nonOrganic.shift());
            } else {
                mergedPosts.push(organic.shift());
            }
        }
        return mergedPosts;
    };

    router.get("/", async (req, res) => {
        const profileid = getProfileId(req);
        let organicPosts = await DB.getFeed(profileid);
        //Add non-organic posts
        const nonOrganicPosts = await generateNonOrganicPosts(req, profileid);
        const posts = mergePosts(promotionalPosts, nonOrganicPosts);
        return res.json(posts);
    });

    router.get("/extended", async (req, res) => {
        const profileid = getProfileId(req);
        //Add non-organic posts
        const nonOrganicPosts = await generateNonOrganicPosts(req, profileid);
        let promotionalPosts = await DB.getPromotionalPosts(profileid);
        const posts = mergePosts(promotionalPosts, nonOrganicPosts);
        return res.json(posts);
    });

    router.get("/usr/:id", async (req, res) => {
        const profileId = req.params.id;
        const viewerProdileId = getProfileId(req);
        const profile = await DB.getProfileCache(profileId);
        const posts = await DB.getPosts(profileId, viewerProdileId);
        if (profile.isCourse) {
            //check for subscription
            //const viewerProdile = await DB.getProfileCache(viewerProdileId);
            //if (!viewerProdile.subscription || viewerProdile.subscription < (new Date()-1)) {
            //    return res.json([posts[posts.length - 1]]);
            //}
        }
        return res.json(posts);
    });

    router.get("/usr/:id/images", async (req, res) => {
        const profileid = req.params.id;
        const viewerProfileId = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, viewerProfileId);
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/usr/:id/embedded", async (req, res) => {
        const profileid = req.params.id;
        const viewerProfileId = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, viewerProfileId, "@iframe:");
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/usr/:id/media", async (req, res) => {
        const profileid = req.params.id;
        const viewerProfileId = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, viewerProfileId, "@youtube:|@vimeo:|@hls:");
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/video/:id", async (req, res) => {
        videoId = req.params.id;
        return res.json([]);
    });

    router.post("/", async (req, res) => {
        let post = {
            profileid: getProfileId(req),
            ...req.body
        }
        const isGroupPrivate = await DB.isGroupPrivate(post.toProfile);
        const isGroupNewsOnly = await DB.isGroupNewsOnly(post.toProfile);
        if (post.toProfile && isGroupPrivate) {
            let requestProfile = getProfileId(req) + "";
            let group = await DB.getProfileCache(post.toProfile);
            if (!group.subscribed[requestProfile] && group._id != requestProfile) {
                return res.json({
                    status: "You are not part of this private group",
                });
            }
        }
        if (post.toProfile && isGroupNewsOnly) {
            return res.json({
                status: "This is a news only group, only the admin can post",
            });
        }
        post.toProfile = post.toProfile ? DB.ObjectID(post.toProfile) : undefined;
        let postObj = new Post(post);
        let dbr = await DB.newPost(postObj);
        post = postObj.toObj();
        post._id = dbr.insertedId;
        if ((post.toProfile && post.toProfile != post.profileid) || post.nonOrganicType == 'News') {
            await Notifications.youGotANewPost(post);
        }
        await Notifications.yourGroupMakeANewPost(post);
        if(!isGroupPrivate){
            await Notifications.yourSubscriptionProfileHasNewPost(post);
        }
        return res.json({
            status: "ok",
            ...post
        })
    });

    router.post("/react", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        let reaction = {
            type: "like",
            createdAt: new Date()
        };
        r = await DB.newReaction(postid, profileid, reaction);
        Notifications.youGotANewReaction(postid, profileid, 'like');
        return res.json({
            status: "ok"
        });
    });

    router.post("/unreact", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        r = await DB.removeReaction(postid, profileid);
        return res.json({
            status: "ok"
        })
    });

    router.post("/bookmark", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        r = await DB.bookmarkPost(postid, profileid);
        return res.json({
            status: "ok"
        });
    })

    router.post("/unbookmark", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        r = await DB.unbookmarkPost(postid, profileid);
        return res.json({
            status: "ok"
        })
    });

    router.post("/comment/", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        let content = req.body.content;
        let comment = {
            profileid: profileid,
            content: content,
            createdAt: new Date(),
            lastUpdated: new Date(),
            reactions: {}
        }
        Notifications.youGotANewPostComment(postid, profileid, content)
        r = await DB.newComment(postid, comment);
        return res.json({
            status: "ok",
            ...comment
        })
    });

    router.post("/comment/react", async (req, res) => {
        let userid = getProfileId(req);
        let postid = req.body.postid;
        let commentDate = new Date(req.body.commentDate);
        let reaction = {
            type: "like",
            createdAt: new Date()
        };
        r = await DB.newCommentReaction(postid, commentDate, userid, reaction);
        return res.json({
            status: "ok"
        })
    });

    router.post("/comment/unreact", async (req, res) => {
        let profileid = getProfileId(req);
        let postid = req.body.postid;
        let commentDate = new Date(req.body.commentDate);
        r = await DB.removeCommentReaction(postid, commentDate, profileid);
        return res.json({
            status: "ok"
        })
    });

    router.get("/images", async (req, res) => {
        const profileid = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, profileid);
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/embedded", async (req, res) => {
        const profileid = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, profileid, "@iframe:");
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/media", async (req, res) => {
        const profileid = getProfileId(req);
        const posts = await DB.getMediaTagPostOfUser(profileid, profileid, "@youtube:|@vimeo:|@hls:");
        return res.json({
            status: "ok",
            posts
        });
    });

    router.get("/course/recent", async (req, res) => {
        const profileid = getProfileId(req);
        const profile = await DB.getProfileCache(profileid);
        const mediaPostsId = []
        const recentMedia = {};
        const mediaProfileP = []
        let postPromises = [];
        // Get watch information from profile data
        Object.keys(profile.data).forEach(key => {
            // So far we only use watch info using postid keys
            if(DB.ObjectID.isValid(key)){
                mediaPostsId.push(profile.data[key]);
                postPromises.push(DB.getPostCached(profile.data[key].postId));
                if(!recentMedia[profile.data[key].profileId]){
                    recentMedia[profile.data[key].profileId] = [];
                    mediaProfileP.push(DB.getProfileCache(profile.data[key].profileId));
                }
            }
        });
        recentMediaArray = mediaPostsId.sort((a,b)=>{
            return b.ts - a.ts;
        });
        const postObjs = await Promise.all(postPromises);
        const postObjsMap = postObjs.reduce((map, item)=>{
            map[item._id] = item;
            return map
        }, {});
        recentMediaArray.forEach(record => {
            const postAndRecord = {
                watchRecord: record,
                ... postObjsMap[record.postId]
            }
            recentMedia[record.profileId].push(postAndRecord);
        });
        // Transform profiles array to dict
        let mediaProfile = await Promise.all(mediaProfileP);
        let mediaProfileMap = mediaProfile.reduce((dict, item) => {
                dict[item._id] = item;
                return dict;
            }, {});
        return res.json({
            status: "ok",
            recentMedia,
            mediaProfileMap,
        });
    });

    router.get("/:id", async (req, res) => {
        const postId = req.params.id;
        const post = await DB.getPost(postId);
        return res.json({
            status: "ok",
            ...post
        });
    });

    router.delete("/:id", async (req, res) => {
        const profileid = getProfileId(req) + '';
        const postId = req.params.id;
        const post = await DB.getPost(postId);
        if (!postBelongToProfile(post, profileid))
            return res.json({
                status: "This post is not yours."
            });
        await DB.removePost(postId);
        return res.json({
            status: "ok"
        });
    });

    router.post("/:id", async (req, res) => {
        const profileid = getProfileId(req) + '';
        const postId = req.params.id;
        const post = await DB.getPost(postId);
        const newContent = req.body.content;
        if (!postBelongToProfile(post, profileid))
            return res.json({
                status: "This post is not yours."
            });
        await DB.updatePost(postId, newContent, post.content);
        return res.json({
            status: "ok"
        });
    });

});

module.exports = router