var accept = require('http-accept')
  , express = require('express')
  , routes = require('./routes')
  , http = require('http')
  , url = require('url');

var app = express();

var database_url = process.env.DATABASE_URL;

if(typeof database_url != 'string' || database_url.length == 0) {
  console.warn('Missing environment property DATABASE_URL');
  process.exit(1);
}

app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  // Unfuck the stuff that express injects
  app.use(function (req, res, next) {
    res.removeHeader("X-Powered-By");
    next();
  });
  app.use(urlgenerator);
  app.use(accept);
  app.use(app.router);
  app.use(express.static(__dirname + '/public', {maxAge: 60 * 60 * 1000}));

  routes.setup({
    database_url: process.env.DATABASE_URL
  });
});

app.configure('development', function(){
  app.use(express.errorHandler());
});

function urlgenerator(req, res, next) {
  var host = req.headers.host;
  res.urlgenerator = {
    start: function() {
      return 'http://' + host + '/';
    },

    departments: function(query) {
      return url.format({
        protocol: 'http',
        host: host,
        pathname: '/department/',
        query: query
      });
    },
    department: function(dept_no) {
      return 'http://' + host + '/department/' + dept_no;
    },
    employeesInDepartment: function(dept_no, query) {
      return url.format({
        protocol: 'http',
        host: host,
        pathname: '/department/' + dept_no + '/employees',
        query: query
      });
    },

    employees: function(query) {
      return url.format({
        protocol: 'http',
        host: host,
        pathname: '/employee/',
        query: query
      });
    },
    employee: function(emp_no) {
      return 'http://' + host + '/employee/' + emp_no;
    }
  };
  next();
}

app.all('/', routes.index);
app.all('/department', routes.departments);
app.all('/department/:dept_no', routes.department);
app.all('/department/:dept_no/employees', routes.employeesInDepartment);
app.all('/employee', routes.employees);
app.all('/employee/:emp_no', routes.employee);

http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});