//lookup.js

//Getting local variables via the configuration file.
var config = require('./configuration');
var school_id = config().school_id;

//Getting first and third party modules
var fs = require('fs');
var database = require('mongoskin').db('mongodb://' + config().database); //Initialize the database connection.

//Function for looking through the database and finding entries related to the searchterm.
function get(req, res, next, search) {
  var index = database.collection('index'); //Initialize the database collection.
  easter(search) ? req.easter = easter(search) : null; //Bind the easter object to the request object.
  easter(search) ? search = easter(search).name : null; //Check if there are any eastereggs matching the search query.
  search = new RegExp(search, 'i'); //Make regular exeption for ignoring the case (Bram vs BRAM) should return the same.

  index.find({$or : [{id : search}, {name : search}, {first_name : search}, {last_name : search}, {username: search}]}).toArray(function (err, database_entry) {
    if (err) console.warn(err);

    if (req.easter.type == 'RIP') { //There is an easteregg type that is a grave stone for old students and teachers, here's the logical exception for it.
        require('./auth').is(req, res, function () { //Ask the authentication system if the user is authenticated (will happen several times in the module).
          res.render('schedule', req);
        });
    }
    else if (database_entry.length == 1) { //If there was a match in the system with the supplied
      database_entry[0].url = make_url(req, database_entry[0]);
      req.match = database_entry[0];
      next();
    }
    else if (database_entry.length == 0) { //If there were no matches found.
      require('./auth').is(req, res, function () {
        res.render('not_found', req); //Render the not_found page.
      });
    }
    else { //If there are multiple matches found in the system
      req.match = database_entry;
      require('./auth').is(req, res, function () {
        res.render('list', req); //Render the list view
      });
    }
  });
}

function api(req, callback) {
  var index = database.collection('index');
  var query = RegExp(req.query.name, 'i');

  index.find({$or : [{id : query}, {name : query}, {first_name : query}, {last_name : query}, {username: query}, {group: query}]}).toArray(function (err, database_entry) {
    if (err) callback({'error': err});
    else {
      for (entry of database_entry) {entry.url = make_url(req, entry)}
      callback({'data': database_entry});
    }
  });
}

function list(req, res, next, list) {
  var index = database.collection('index');
  var query = RegExp(list, 'i');

  index.find({group: list}).toArray(function (err, database_entry) {
    if (err) {req.error = err; next();}
    else {
      if (database_entry.length < 1) require('./auth').is(req, res, function () {
        res.render('not_found', req);
      });
      req.match = database_entry;
      next();
    }
  });
}

//Function for making a link out of the given database_entry.
function make_url(req, database_entry) {
  var url = 'http://roosters5.gepro-osi.nl/roosters/rooster.php?school=' + school_id + '&type=' + database_entry.type.charAt(0).toUpperCase() + database_entry.type.slice(1) + 'rooster';

  switch (database_entry.type) {
    case 'leerling' :
      url += '&afdeling=' + database_entry.studentcategory + '&leerling=' + database_entry.id;
    break;

    case 'docent' :
      url += '&docenten=' + database_entry.name;
    break;

    case 'lokaal' :
      url += '&lokalen=' + database_entry.name;
    break;

    case 'klas' :
      url += '&klassen=' + database_entry.name;
    break;
  }

  if (req.query.tab) url += '&tabblad=' + req.query.tab

  return url;
}

//Function for checking the given search query for eatereggs.
//TODO: add a way to supply a template file for eastereggs.
function easter(search) {
  console.log('search', search);
  var list = JSON.parse(fs.readFileSync(__dirname + '/eastereggs.json'));

  for (entry of list) {
    if (entry.easter == search.toLowerCase()) return entry;
  }

  return null;
}

module.exports = {'get': get, 'api': api, 'list': list};

//Testing function, if test is passed in the command line will execute a test.
if (process.argv[2] == "test") {
  console.log(easter('aardappel'));
}