/* global __dirname */
/* jshint strict:false */
"use strict";
var express      = require('express');
var bodyParser   = require('body-parser');
var slug         = require('slug');
var beautify     = require("json-beautify");
var _            = require('lodash');
var fs           = require('fs');
var path         = require('path');
var Promise      = require('bluebird');
var Mustache     = require('mustache');
var app          = express();
var ExampleStore = require('./lib/ExampleStore');
var indexTpml    = fs.readFileSync(__dirname + '/html/index.mustache.html').toString();
var sandboxTpml  = fs.readFileSync(__dirname + '/html/template.mustache.html').toString();
Promise.promisifyAll(fs);
var exStore     = new ExampleStore(__dirname + '/exemples');
exStore.init()
.then(() => console.log(exStore.getMenu()));

// Initialize Express app: root folder as static, body parsers
app.use(express.static(__dirname));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));


function addExample(slug, title) {
  examples.push({ slug: slug, title: title });
  return fs.writeFileAsync(examplesJSON, beautify(examples, null, 2, 100));
}

function readConfigJson(exampleSlug) {
  console.log(exampleSlug);
  return require('./exemples/jquery/' + exampleSlug + '/config.json');
}

function readFileAsync(file) {
  return fs.readFileAsync(file)
  .then(buf => (buf.toString()));
}

function readFilesAsync(fullPath, files) {
  // console.log('reading files', files, 'from path', path);
  return Promise.reduce(files,
    (carry, f) => readFileAsync(fullPath + '/' + f)
      .then(content => 
        (carry.concat([{
          type: path.extname(f).substr(1),
          name: f,
          content
        }]))
      ),
    []
  );
}

function readExampleFiles(repoSlug, exampleSlug, config) {
  const exampleDir = __dirname + '/exemples/' + repoSlug + '/' + exampleSlug;
  const libsCssDir = __dirname + '/css/vendor';
  const libsJsDir  = __dirname + '/js/vendor';
  const { html, js, css } = config; // libsCss, libsJs 
  const files = [].concat(html, js, css);
  return readFilesAsync(exampleDir, files);
}


/**
 * Index page: render with only repo list in menu
 */
app.get('/', function(req, res) {
  const menuRepo = exStore.getRepoMenu();
  // const title    = 'Home';
  console.log(menuRepo);
  res.send(Mustache.render(indexTpml, {
    title,
    menuRepo
  }));
});

/**
 * Repo page: render with repo list and selected repo's example list in menu
 */
app.get('/:repoSlug',
  function(req, res) {
    const repo = exStore.getRepo(req.params.repoSlug);
    if(! repo) {
      return res.status(404).send('Repo ' + req.params.repoSlug + ' not found');
    }
    const menuRepo = exStore.getRepoMenu();
    const menuExample = exStore.getExampleMenu(repo.path);
    // const title    = 'Home';
    console.log(menuExample);
    res.send(Mustache.render(indexTpml, {
      // title,
      menuRepo,
      menuExample
    }));
});

/**
 * Example page: render with repo list and selected repo's example list in menu,
 * and the editor with the selected example
 */
app.get('/:repoSlug/:exampleSlug',
  function(req, res) {
    const repo = exStore.getRepo(req.params.repoSlug);
    if(! repo) {
      return res.status(404).send('Repo ' + req.params.repoSlug + ' not found');
    }
    const menuRepo = exStore.getRepoMenu();
    const menuExample = exStore.getExampleMenu(repo.path);
    const example = _.find(repo.examples, { slug: req.params.exampleSlug });
    if(! example) {
      return res.status(404).send('Example ' + req.params.repoSlug + '/' + req.params.exampleSlug + ' not found');
    }
    // const title    = 'Home';
    console.log(menuExample);
    const { repoSlug, exampleSlug } = req.params;
    readExampleFiles(repoSlug, exampleSlug, example)
    .then(files => {
      // console.log('example files', html, js, css);
      res.send(Mustache.render(indexTpml, {
        // title,
        menuRepo,
        menuExample,
        files,
        filesJSON: JSON.stringify(files)
      }));
    });
});

app.post('/examples', function(req, res) {
  var title = req.body.title;
  if(! req.body.title) {
    res.status(400).send('Le titre ne peut pas être vide !');
  }
  var existingTitle = _.find(examples, { title: title });
  if(existingTitle) {
    res.status(400).send("L'exemple '" + title + "' existe déjà !");
  }
  var exampleSlug = slug(req.body.title.toLowerCase());
  var targetDir = __dirname + '/exemples/' + exampleSlug;

  fs.mkdirAsync(targetDir)
  .then(() => Promise.map(
    ['contenu.html', 'script.js'], f => fs.writeFileAsync(targetDir + '/' + f, '')
  ))
  .then(files => addExample(exampleSlug, title))
  .then(() => res.json({ slug: exampleSlug, title: title }));
});

app.get('/examples/:slug', function(req, res) {
  const { slug } = req.params;
  const config = readConfigJson(slug);
  const { title, html, js, css, libsCss, libsJs } = config;
  readFileAsync(__dirname + '/exemples/' + slug + '/example.html')
  .then(body =>
    Mustache.render(sandboxTpml, { body, slug, title, js, css, libsCss, libsJs })
  )
  .then(html => res.send(html));
});

app.get('/menu', (rea, res) => {
  res.send(exStore.getMenu());
});

app.get('/list/:repoPath', function(req, res) {
  const { repoPath } = req.params;
  const repo = exStore.getList(repoPath);
  if(! repo) {
    return res.status(404).send('Repo ' + repoPath + ' not found');
  }
  console.log('found repo', repo);
  const data = repo.examples.map(e => (
    { slug: e.slug, title: e.title }
  ));
  res.json(data);
});

app.put('/examples/:slug', function(req, res) {
  var slug = req.params.slug;
  var existing = _.find(examples, { slug: slug });
  if(! existing) {
    res.status(404).send("L'exemple avec l'identifiant '" + slug + "' est introuvable !");
  }
  var targetDir = __dirname + '/exemples/' + slug;
  if(req.body.html) {
    fs.writeFileSync(targetDir + '/contenu.html', req.body.html);
  }
  if(req.body.javascript) {
    fs.writeFileSync(targetDir + '/script.js', req.body.javascript);
  }
  var theDate = new Date();
  console.log(theDate.getHours() + ':' + theDate.getMinutes() + " - Sauvegarde de l'exemple '" + existing.title + " effectuée'");
  res.json({ success: true });
});

module.exports = app;