import {
  handlersPath,
  VERSION
} from "../settings/globals";

let db = require(handlersPath + "/db.js");
let Functions = require(handlersPath + "/functions.js");

function frontpage_lists(msg, socket) {
  if (
    msg == undefined ||
    !msg.hasOwnProperty("version") ||
    msg.version != VERSION ||
    msg.version == undefined
  ) {
    const result = {
      version: {
        expected: VERSION,
        got: msg.hasOwnProperty("version") ? msg.version : undefined
      }
    };
    socket.emit("update_required", result);
    return;
  }

  db.collection("frontpage_lists").find({
    frontpage: true
  }, function (
    err,
    docs
  ) {
    db.collection("connected_users").find({
      _id: "total_users"
    }, function (
      err,
      tot
    ) {
      socket
        .compress(true)
        .emit("playlists", {
          channels: docs,
          viewers: tot[0].total_users.length
        });
    });
  });
}

function get_frontpage_lists(callback) {
  const project_object = {
    _id: 1,
    count: 1,
    frontpage: 1,
    id: 1,
    title: 1,
    viewers: 1,
    accessed: 1,
    pinned: {
      $ifNull: ["$pinned", 0]
    },
    description: {
      $ifNull: [{
          $cond: {
            if: {
              $or: [{
                  $eq: ["$description", ""]
                },
                {
                  $eq: ["$description", null]
                },
                {
                  $eq: ["$description", undefined]
                }
              ]
            },
            then: "This list has no description",
            else: "$description"
          }
        },
        "This list has no description"
      ]
    },
    thumbnail: {
      $ifNull: [{
          $cond: {
            if: {
              $or: [{
                  $eq: ["$thumbnail", ""]
                },
                {
                  $eq: ["$thumbnail", null]
                },
                {
                  $eq: ["$thumbnail", undefined]
                }
              ]
            },
            then: {
              $concat: ["https://img.youtube.com/vi/", "$id", "/mqdefault.jpg"]
            },
            else: "$thumbnail"
          }
        },
        {
          $concat: ["https://img.youtube.com/vi/", "$id", "/mqdefault.jpg"]
        }
      ]
    }
  };
  db.collection("frontpage_lists").aggregate(
    [{
        $match: {
          frontpage: true,
          count: {
            $gt: 3
          }
        }
      },
      {
        $project: project_object
      },
      {
        $sort: {
          pinned: -1,
          viewers: -1,
          accessed: -1,
          count: -1,
          title: 1
        }
      }
    ],
    callback
  );
}

function update_frontpage(coll, id, title, thumbnail, source, callback) {
  db.collection("frontpage_lists").find({
    _id: coll
  }, function (e, doc) {
    const updateObject = {
      id,
      title,
      accessed: Functions.get_time()
    };
    if (
      doc.length > 0 &&
      ((doc[0].thumbnail != "" &&
          doc[0].thumbnail != undefined &&
          (doc[0].thumbnail.indexOf("https://i1.sndcdn.com") > -1 ||
            doc[0].thumbnail.indexOf("https://w1.sndcdn.com") > -1 ||
            doc[0].thumbnail.indexOf("https://img.youtube.com") > -1)) ||
        (doc[0].thumbnail == "" || doc[0].thumbnail == undefined))
    ) {
      updateObject.thumbnail = thumbnail;
      if (thumbnail == undefined) updateObject.thumbnail = "";
    }
    db.collection("frontpage_lists").update({
        _id: coll
      }, {
        $set: updateObject
      }, {
        upsert: true
      },
      function (err, returnDocs) {
        if (typeof callback == "function") callback();
      }
    );
  });
}

module.exports.get_frontpage_lists = get_frontpage_lists;
module.exports.frontpage_lists = frontpage_lists;
module.exports.update_frontpage = update_frontpage;