var express = require("express");
var hbs = require('express-hbs');
require('handlebars-form-helpers').register(hbs.handlebars);
var nodemailer = require('nodemailer');
var courtsopenUtils = require('./courtsopenUtils.js');
var fs = require("fs");
var bodyParser = require("body-parser");
var app = express();
var logfile = fs.createWriteStream('./db/log.log', {flags: 'a'});

// Setup email
var transporter = nodemailer.createTransport({
    service: 'Gmail',
    auth: {
        user: 'alertmonitorfl@gmail.com',
        pass: '6g*hkvVc%91oo3#$'
    }
});
var mailOptions = {
    from: 'Alert Monitor <alertmonitorfl@gmail.com>',
    //to: 'jody@kaplon.us,don@gettner.com',
    to: 'jody@kaplon.us',
    subject: 'Device did not wish me a GoodMorning or GoodEvening',
};

var file = "./db/courtsopen.db";
var exists = fs.existsSync(file);

if(!exists) {
    console.log("Creating DB file.");
    fs.openSync(file, "w");
}

var sqlite3 = require("sqlite3").verbose();
var db = new sqlite3.Database(file);

db.serialize(function() {
    if(!exists) {
        // Can't create multiple tables w/one statement, semicolons not allowed.
        db.run(
            "CREATE TABLE Alerts (" +
                "origJSON TEXT," +
                "coreId TEXT," +
                "status TEXT," +
                "published_at TEXT)"
        );
        db.run(
            "CREATE TABLE Cores (" +
                "coreId TEXT PRIMARY KEY," +
                "coreName TEXT," +
                "locationDesc TEXT)"
        );
    }
});

app.use(bodyParser.json());                             // Needed for JSON POST requests from Particle Cores.
app.use(bodyParser.urlencoded({ extended: false }));    // Needed for web POST requests from edit form.

// Use `.hbs` for extensions and find partials in `views/partials`.
app.engine('hbs', hbs.express4({
    partialsDir: __dirname + '/views/partials'
}));
app.set('view engine', 'hbs');
app.set('views', __dirname + '/views');

app.get('/', function(req, res){
    var d = new Date();
    console.log("GET /, " + JSON.stringify(d, 4));
    var devIndexQry = 
        "select status, published_at " + 
        "from Alerts " + 
        "where status in ('Open', 'Closed') " +
        "order by published_at desc " +
        "limit 2"
    db.all(devIndexQry, function(err, rows){
        if(err !== null) {
            console.log(err);
        } else {
            //console.log(rows);

            // Loop over elements in rows array, convert ugly UTC times to pretty local times.
            rows.forEach(function(row){
                row.pubDate = courtsopenUtils.getLocDateFromUTC(row.published_at);
                row.pubTime = courtsopenUtils.getLocTimeFromUTC(row.published_at);
                if(row.status.toLowerCase().indexOf('closed') > -1){
                    row.statusClass = 'closed';
                } else { row.statusClass = 'open'; }
            });

            res.render('index', {values: rows}, function(err, html) {
                if(err !== null) {
                    console.log(err);
                } else {
                    res.send(html);
                }
            });
        }
    });
});

app.post('/', function(req, res){
    var postEvent = req.body.postEvent;
    var source = req.body.source;
    console.log(req.body);

    // If it's stripped down JSON sent by cell modem, there won't be a req.body.data key w/full-nested JSON as value!!!
    // ???how to fix???
    // If post body includes coreid and published_at, assume it's from a particle devcie and parse accordingly.
    if (req.body.coreid !== undefined && req.body.published_at !== undefined) {
        var innerDataJSON = JSON.parse(req.body.data);
        var status = JSON.stringify(innerDataJSON.status, null, 4).slice(1,-1);
        var coreid = JSON.stringify(req.body.coreid, null, 4).slice(1,-1);
        var pubAt = JSON.stringify(req.body.published_at, null, 4).slice(1,-1);
        var stmt = db.prepare("INSERT INTO Alerts (OrigJSON, coreid, published_at, status) VALUES (?, ?, ?, ?)");
        stmt.run(
            JSON.stringify(req.body, null, 4),
            coreid,
            pubAt,
            status
        );
        stmt.finalize();
    } else { // parse for minimal data from cell modem.
        var deviceid = JSON.stringify(req.body.data, null, 4).slice(1,4);
        var statusCode = JSON.stringify(req.body.data, null, 4).slice(5,7);
        var statusFromCode;
        switch (statusCode) {
            case "01": statusFromCode = "Open"; break;
            case "02": statusFromCode = "Closed"; break;
            case "03": statusFromCode = "GoodMorning"; break;
            case "04": statusFromCode = "GoodEvening";
            default: statusFromCode = "UnknownStatus"
        };
        var received_at = new Date(Date.now());
        received_at = received_at.toISOString();
        console.log(statusFromCode + ' ' + received_at);
        var stmtCell = db.prepare("INSERT INTO Alerts (OrigJSON, coreid, published_at, status) VALUES (?, ?, ?, ?)");
        stmtCell.run(
            JSON.stringify(req.body, null, 4),
            deviceid,
            received_at,
            statusFromCode
        );
        stmtCell.finalize();
    }
});

setInterval(function() {
    // Check every hour to see if GoodMorning or GoodEvening has gone missing.
    var deadManQry = "select published_at from Alerts where datetime(published_at) > datetime('now', '-14.5 hours') order by datetime(published_at) limit 1";
    db.get(deadManQry, function(err, row){
        if (err !== null) { console.log(err); }
        //else if (typeof row == undefined) {
        else {  // TEST, send the email as long as there's no error.
            mailOptions.text = "TEST TEST TEST...It's been too long since the last data transmission from device. \n\n";
            
            // Don't include any other details for now, will need to change DB query to get details on last message received.
            //mailOptions.text = mailOptions.text + 'Status message, ' + status + '\n';
            //mailOptions.text = mailOptions.text + 'Published at, ' + courtsopenUtils.getLocDateFromUTC(pubAt) + ' ' + courtsopenUtils.getLocTimeFromUTC(pubAt) + '\n';

            //transporter.sendMail(mailOptions, function(error, info){
                //if(error){
                    //console.log(error);
                //}else{
                    //console.log('Message sent: ' + info.response);
                //}
            //});
        }
    });
}, 60000);

app.listen(3000, function() {
    console.log("Started on PORT 3000");
})