/**
 * Copyright 2013,2014 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

module.exports = function(RED) {
    "use strict";
    var mongo = require('mongodb');
    var MongoClient = mongo.MongoClient;

    function MongoNode(n) {
        RED.nodes.createNode(this,n);
        this.hostname = n.hostname;
        this.port = n.port;
        this.db = n.db;
        this.name = n.name;

        var url = "mongodb://";
        if (this.credentials && this.credentials.username && this.credentials.password) {
            url += this.credentials.username+":"+this.credentials.password+"@";
        }
        url += this.hostname+":"+this.port+"/"+this.db;

        this.url = url;
    }

    RED.nodes.registerType("mongodb",MongoNode,{
        credentials: {
            user: {type:"text"},
            password: {type: "password"}
        }
    });
    
    function MongoOutNode(n) {
        RED.nodes.createNode(this,n);
        this.collection = n.collection;
        this.mongodb = n.mongodb;
        this.payonly = n.payonly || false;
        this.operation = n.operation;
        this.mongoConfig = RED.nodes.getNode(this.mongodb);

        if (this.mongoConfig) {
            var node = this;
            MongoClient.connect(this.mongoConfig.url, function(err,db) {
                if (err) {
                    node.error(err);
                } else {
                    node.clientDb = db;
                    var coll = db.collection(node.collection);
                    node.on("input",function(msg) {
                        if (node.operation == "store") {
                            delete msg._topic;
                            if (node.payonly) {
                                if (typeof msg.payload !== "object") { msg.payload = {"payload":msg.payload}; }
                                coll.save(msg.payload,function(err,item){ if (err){node.error(err);} });
                            } else {
                                coll.save(msg,function(err,item){if (err){node.error(err);}});
                            }
                        }
                        else if (node.operation == "insert") {
                            delete msg._topic;
                            if (node.payonly) {
                                if (typeof msg.payload !== "object") { msg.payload = {"payload":msg.payload}; }
                                coll.insert(msg.payload,function(err,item){ if (err){node.error(err);} });
                            } else {
                                coll.insert(msg,function(err,item){if (err){node.error(err);}});
                            }
                        }
                        else if (node.operation == "update") {
                            delete msg._topic;
                            if (node.payonly) {
                                if (typeof msg.payload !== "object") { msg.payload = {"payload":msg.payload}; }
                                coll.update(msg.payload,function(err,item){ if (err){node.error(err);} });
                            } else {
                                coll.update(msg,function(err,item){if (err){node.error(err);}});
                            }
                        }
                        if (node.operation == "delete") {
                            coll.remove(msg.payload, {w:1}, function(err, items){ if (err) { node.error(err); } });
                        }
                    });
                }
            });
        } else {
            this.error("missing mongodb configuration");
        }

        this.on("close", function() {
            if (this.clientDb) {
                this.clientDb.close();
            }
        });
    }
    RED.nodes.registerType("mongodb out",MongoOutNode);


    function MongoInNode(n) {
        RED.nodes.createNode(this,n);
        this.collection = n.collection;
        this.mongodb = n.mongodb;
        this.mongoConfig = RED.nodes.getNode(this.mongodb);

        if (this.mongoConfig) {
            var node = this;
            MongoClient.connect(this.mongoConfig.url, function(err,db) {
                if (err) {
                    node.error(err);
                } else {
                    node.clientDb = db;
                    var coll = db.collection(node.collection);
                    node.on("input",function(msg) {
                        msg.projection = msg.projection || {};
                        coll.find(msg.payload,msg.projection).sort(msg.sort).limit(msg.limit).toArray(function(err, items) {
                            if (err) {
                                node.error(err);
                            } else {
                                msg.payload = items;
                                delete msg.projection;
                                delete msg.sort;
                                delete msg.limit;
                                node.send(msg);
                            }
                        });
                    });
                }
            });
        } else {
            this.error("missing mongodb configuration");
        }

        this.on("close", function() {
            if (this.clientDb) {
                this.clientDb.close();
            }
        });
    }
    RED.nodes.registerType("mongodb in",MongoInNode);
}