/*
 * Main database access functions
 */
var common,
    model = {};

const dbs = {
    /* Method API route
     * <- to server
     * -> to client
     * Description
     */
    routes: {
        "msg/ids": {
            /* GET /api/msg/ids [no args]
             * -> Array of message schema object ids
             * Get ALL known message ids
             */
            get: function(req, res) {
                model.Messages.find({},{_id: true}).exec()
                    .then(results => {
                    //selects id from message:
                    var parsed = [];
                    for (var i in results) {
                        parsed.push (results[i]._id);
                    }
                    res.send(parsed);
                } )
                .catch(err => {
                    console.log (err);
                    res.status(500).json(err);
                });
            },
        },
        "msg/id": {
            params: ":id",
            /* GET /api/msg/id/[massage-id]
             * -> Message schema
             * Get a particular message
             */
            get: function(req, res) {
                model.Messages.findById(req.params.id)                      .exec(function(err, result) {
                    if (err) {
                        console.log (err);
                        res.status(404).json(err);
                    } else {
                        //console.log(JSON.stringify(result));
                        res.json(result);
                    }
                });
            },
        },
        "msg/search": {
            params: ":phrase",
            /* GET /api/msg/id/[massage-id]
             * -> Message schema
             * Get a particular message
             */
            get: function(req, res) {
                model.Messages.find({$text: {$search: req.params.phrase}})
                .exec().then(results => {
                    //selects id from message:
                    var parsed = [];
                    for (var i in results) {
                        parsed.push (results[i]._id);
                    }
                    res.send(parsed);
                } )
                .catch(err => {
                    console.log (err);
                    res.status(500).json(err);
                });
            },
        },
        "msg": {
            /* POST /api/msg
             * <- Message schema
             * -> Message schema
             * Create a new message
             */
            post: function(req, res) {
                /*
                if ( !(req.body.tags instanceof Array) ) {
                    return res.status(400).json({ error: "bad request" });
                }*/
                //console.log("Subject: "+JSON.stringify(req.body));

                model.Messages.create({
                    subject: req.body.subject,
                    message: req.body.message,
                    user: req.body.user,
                    tag: req.body.tag
                }, function(err, result) {
                    if (err) {
                        return res.status(401).json(err.message);
                    } else {
                        res.json({message: "Message created!!"});
                    }
                    if (result == null) {
                        return res.status(500).json("Can not create message.")
                    }
                });
            },
            /* PUT /api/msg
             * <-
             * ->
             * Update a message
             */
            //put: function(req, res) {},
        },
        "tag/ids": {
            /* GET /api/tag/ids [no args]
             * -> Array of tag schema object ids
             * Get ALL known tag ids
             */
            get: function(req, res) {
                model.Tags.find({},{_id: true}).exec()
                    .then(results => {
                    //selects id from tag:
                    var parsed = [];
                    for (var i in results) {
                        parsed.push (results[i]._id);
                    }
                    res.send(parsed);
                } )
                .catch(err => {
                    console.log (err);
                    res.status(500).json(err);
                });
            },
        },
        "tag": {
            params: ":id",
            /* GET /api/tag/[tag-id]
             * -> Tag schema
             * Get a particular tag
             */
            get: function(req, res) {
                model.Tags.findById(req.params.id)                      .exec(function(err, result) {
                    if (err) {
                        console.log (err);
                        res.status(404).json(err);
                    } else {
                        //console.log(JSON.stringify(result));
                        res.json(result);
                    }
                });
            },
        },
    },
    /* Initialize requirements
     *  - DB connection
     *  - DB schemata
     */
    init: function (_common) {
        common = _common;

        /* DB Connection
         * Local db: common.config.dbLocalConn
         * TH    db: common.config.dbConn
         */
        common.mongoose.connect (common.config.dbLocalConn, {
            useNewUrlParser: true
        }).then(() => {
            console.log("Database connected successfully.");
        }).catch(err => {
            console.log('Database connection error.');
            process.exit();
        });

        /* DB Schemata
         * Privat fields:
         * - per model: _list: Elements that are included in list fetch
         * - per entry: _comment: Comment for Admin UI - TODO: not working yet
         */
        var messageSchema = common.mongoose.Schema({
            subject: { type: String, required: true,
                      _comment: "" },
            message: { type: String, required: true,
                      _comment: "" },
            user:    { type: String, required: true,
                      _comment: "" },
            tag:    { type: [String],
                      _comment: "" },
            //createtime: { type: Date, default: Date.now },
        });
        messageSchema.index({ tag:'text', subject:'text', message:'text', user:'text' });
        model.Messages = common.mongoose.model('messages', messageSchema);
        model.Messages._list = [ "" ];

        var tagSchema = common.mongoose.Schema({
            name:    { type: String, required: true,
                      _comment: "" }, //unique
        });
        model.Tags = common.mongoose.model('tags', messageSchema);
        model.Tags._list = [ "" ];

        var userSchema = common.mongoose.Schema({
            //_id: { type: String },
            name:    { type: String, required: true,
                      _comment: "" },
            pwd:     { type: String,
                      _comment: "" },
            //hash: { type: String },
            //salt: { type: String },
            //type: { type: String },
            roles:   { type: [String], required: true,
                      _comment: "" },
            tags:    { type: [String],
                      _comment: "" },
            //deactivated: { type: Boolean },
            //participating: { type: [String] },
            //host: { type: Boolean },
            bookmarks: { type: [String],
                      _comment: "" },
        });
        model.Users = common.mongoose.model('users', userSchema);
        model.Users._list = [ "" ];
    },
    models: model,
};


/*
app.get ("/api/msg/search/:phrase", function (req, res) {
    Message.find ({$text: {$search: req.params.phrase}) .then (function (err, results){
        if (err) {
            console.log (err);
            res .status(404) .json (err);
        } else {
            console.log(JSON.stringify(results));
            res.json(results);
        }
    });
});
*/
module.exports = dbs;