/* 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 Promise      = require('bluebird');
var Mustache     = require('mustache');
var app          = express();
// var examplesJSON = __dirname + '/exemples/liste.json';
var sandboxTpml  = fs.readFileSync(__dirname + '/html/template.mustache.html').toString();
// var examples     = require(examplesJSON);
Promise.promisifyAll(fs);

// 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 scandir(path, excludes) {
  excludes = excludes || [];
  return fs.readdirAsync(path)
  .then(dirContent => {
    excludes.forEach(file => {
      var idxInContent = dirContent.indexOf(file);
      if(idxInContent !== -1) {
        dirContent.splice(idxInContent, 1);
      }
    });
    return dirContent;
  })
}

function ExampleStore(path) {
  this.rootPath = path;
  this.repos = [];
}

ExampleStore.prototype.init = function() {
  const loadRepository = this.loadRepository.bind(this);
  return scandir(this.rootPath, ['.gitkeep'])
  .then(repositories => Promise.map(
    repositories, loadRepository
  ));
};

ExampleStore.prototype.loadRepository = function(repoPath) {
  const loadExample    = this.loadExample.bind(this);
  const fullPath       = this.rootPath + '/' + repoPath;
  const repoConfig     = require(fullPath + '/repo-config.json');
  const repoDescriptor = {
    title: repoConfig.title,
    path: repoPath,
    fullPath,
    examples: []
  };
  this.repos.push(repoDescriptor);
  return scandir(fullPath, ['.gitkeep', 'repo-config.json'])
  .then(examples => Promise.map(
    examples, example => loadExample(repoDescriptor, example)
  ))
  .then(() => console.log(this.repos[0]))
};

ExampleStore.prototype.loadExample = function(repo, slug) {
  const exampleConfig = require(repo.fullPath + '/' + slug + '/config.json');
  repo.examples.push(Object.assign({ slug }, exampleConfig));
  return exampleConfig;
};

ExampleStore.prototype.getList = function(path) {
  return _.find(this.repos, { path });
}

ExampleStore.prototype.getMenu = function(path) {
  const self = this;
  return '<ul>' + self.repos.reduce((menu, repo) => {
    return '<li>'+ repo.title + '<ul>' + repo.examples.reduce((submenu, example) =>
      (submenu + '<li><a href="#' + repo.path + '/' + example.slug  + '">' + example.title + '</a></li>'),
    '') + '</ul></li>';
  }, '') + '</ul>';
}


var es = new ExampleStore(__dirname + '/exemples');
es.init()
.then(() => console.log(es.getMenu()));


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(path, files) {
//   // console.log('reading files', files, 'from path', path);
//   return Promise.map(files,
//     f => readFileAsync(path + '/' + f)
//   );
// }

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

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(es.getMenu());
});

app.get('/list/:repoPath', function(req, res) {
  const { repoPath } = req.params;
  const repo = es.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;