'use strict';
// npm install express express-hbs

function create(hbs, env) {
  if (env) process.env.NODE_ENV = env;

  var express = require('express');
  var app = express();
  var fs = require('fs');
  var fp = require('path');

  function relative(path) {
    return fp.join(__dirname, path);
  }

  var viewsDir = relative('views');

  app.use(express.static(relative('public')));

  // Hook in express-hbs and tell it where known directories reside
  app.engine('hbs', hbs.express4({
    partialsDir: [relative('views/partials'), relative('views/partials-other')],
    defaultLayout: relative('views/layout/default.hbs'),
    restrictLayoutsTo: viewsDir
  }));
  app.set('view engine', 'hbs');
  app.set('views', viewsDir);

  // Register sync helper
  hbs.registerHelper('link', function(text, options) {
    var attrs = [];
    for (var prop in options.hash) {
      attrs.push(prop + '="' + options.hash[prop] + '"');
    }
    return new hbs.SafeString(
      '<a ' + attrs.join(' ') + '>' + text + '</a>'
    );
  });

  // Register Async helpers
  hbs.registerAsyncHelper('readFile', function(filename, cb) {
    fs.readFile(fp.join(viewsDir, filename), 'utf8', function(err, content) {
      if (err) console.error(err);
      cb(new hbs.SafeString(content));
    });
  });

  var fruits = [
    {name: 'apple'},
    {name: 'orange'},
    {name: 'pear'}
  ];

  var veggies = [
    {name: 'asparagus'},
    {name: 'carrot'},
    {name: 'spinach'}
  ];

  app.get('/', function(req, res) {
    res.render('index', {
      title: 'express-hbs example'
    });
  });

  app.get('/replace', function(req, res) {
    res.render('replace', {
      title: 'express-hbs example'
    });
  });

  app.get('/fruits', function(req, res) {
    res.render('fruits/index', {
      title: 'My favorite fruits',
      fruits: fruits
    });
  });

  app.get('/fruits/:name', function(req, res) {
    res.render('fruits/details', {
      fruit: req.params.name
    });
  });

  app.get('/veggies', function(req, res) {
    res.render('veggies', {
      title: 'My favorite veggies',
      veggies: veggies,
      layout: 'layout/veggie'
    });
  });

  app.get('/veggies/:name', function(req, res) {
    res.render('veggies/details', {
      veggie: req.params.name,
      layout: 'layout/veggie-details'
    });
  });

  return app;
}

if (require.main === module) {
  var hbs = require('..');
  var app = create(hbs);
  app.listen(3000);
  console.log('Express server listening on port 3000');
} else {
  exports.create = create;
}