var express = require('express');

var fbId = process.env.FACEBOOK_APP_ID || "YOUR FACEBOOK APP IP",
    fbSecret = process.env.FACEBOOK_SECRET || "YOUR FACEBOOK SECRET",
    sessionSecret = process.env.SESSION_SECRET || "SOME RANDOM STRING",
    port = process.env.PORT || 3000;

var app = express.createServer(
  express.logger(),
  express.static(__dirname + '/public'),
  express.bodyParser(),
  express.cookieParser(),
  express.session({ secret: sessionSecret }),
  require('faceplate').middleware({
    app_id: fbId,
    secret: fbSecret,
    scope:  'email'
  })
);

app.listen(port);

function login_page(req,res) {
  if(req.facebook.token) {
    req.facebook.me(function(user) {
      req.session.user_id = user.id;
      req.session.user_name = user.name;
      res.redirect('/game');
    });
  } else {
    req.facebook.app(function(app) {
      res.render('login.ejs', {
        layout:    false,
        req:       req,
        app:       app
      });
    });
  }
}

app.get('/',login_page);
app.post('/',login_page);
 

function authenticated(method) {
  return function(req,res) {
    if (req.session.user_id) {
      method(req,res);
    } else {
      res.redirect('/');
    }
  }
}


var clickTime = 5000,
    dbMethods = {};

require("mongodb").connect(process.env.MONGOHQ_URL || "mongodb://localhost/blob_clicker", 
              {}, function(error,db) {
  db.collection('users', function(err, collection){
    dbMethods.fetchUser = function(session,callback) {
      collection.findOne({ user_id: session.user_id }, function(error,user) {
        if(!user) {
          user = {
            user_id: session.user_id,
            name: session.user_name,
            clicks: 0,
            next_click: new Date().getTime()
          }
        }
        callback(user);
      });
    };

    dbMethods.clickUser = function(user, callback) {
      var now = new Date().getTime(); 

      if(user.next_click <= now) {
        user.clicks += 1;
        user.next_click = now + clickTime;
        collection.save(user, function() { callback(user); });
      } else {
        callback(false);
      }
    };

    dbMethods.topTen = function(callback) {
      collection.find().sort({ clicks: -1 }).limit(10).toArray(function(error,results) {

        var output = [];
        for(var i in results) {
          output.push([ results[i].name, results[i].clicks ]);
        }
        callback(output);
      });
    };
  });
});

app.get('/game',authenticated(function(req,res) {
  dbMethods.fetchUser(req.session,function(user) {
    var now = new Date().getTime(),
        nextClick = (user.next_click - now)/1000;

    res.render('game.ejs', {
        layout:    false,
        req:       req,
        user:      user,
        nextClick: nextClick
	});
  });
}));

app.post("/click",authenticated(function(req,res) {
  dbMethods.fetchUser(req.session,function(user) {
    dbMethods.clickUser(user,function(clicked) {
      if(clicked) {
        var now = new Date().getTime(),
            nextClick = (user.next_click - now)/1000;
        res.json({ clicked: true, user: clicked, nextClick: nextClick });
      } else {
        res.json({ clicked: false })
      }
    });
  });
}));

app.get('/top-ten',authenticated(function(req,res) {
  dbMethods.topTen(function(results) {
    res.json({ users: results });
  });
}));