#!/usr/bin/env node
var fs = require('fs');
var m_path = require('path');
var util = require('util');
var QCore = require('./QCore.js');
/* qwiki
Node.js based Implementation of the proposed qwiki document
*/
/********************************* 
 * QWiki                         *
 *********************************/
var QWiki = function() {
  QCore.call(this);
  this.initialize();
}; util.inherits(QWiki, QCore);
/* QWiki.initialize()
Checks for and creates the following directories:
  * wiki/
  * cache/
  * tmp/

Checks for and copies the following directories/files:
  * index.html
  * acts/
*/
QWiki.prototype.listen = function(port, cb) {
  this.loadWikiIndex();
  this.constructor.super_.prototype.listen.call(this, port, cb);
};
QWiki.prototype.initialize = function() {
  // check if QWiki instance is running in a different directory than the module,
  // and if so, copy over default files
  var cwd = process.cwd();
  if (cwd !== __dirname) {
    console.log('Running from: ' + cwd);
    // TODO: copy acts/, wiki/, and index.html from __dirname to cwd if not existing
  } else {
    console.log('Running from: ' + __dirname);
  }
  // make wiki directory
  try {
    var stats = fs.statSync('wiki');
    if (!stats.isDirectory()) {
      console.log('error, "wiki" is not a directory');
    }
  } catch (err) {
    if (err.code == 'ENOENT') {
      fs.mkdirSync('wiki');
      console.log('Created "wiki/" -- this is where the wiki source files are stored');
    } else {
      console.log('error while loading wiki directory');
    }
  }
  // make cache directory
  try {
    var stats = fs.statSync('cache');
    if (!stats.isDirectory()) {
      console.log('error, "cache" is not a directory');
    }
  } catch (err) {
    if (err.code == 'ENOENT') {
      fs.mkdirSync('cache');
      console.log('Created "cache/" -- this is where processed wiki pages are stored as HTML');
    } else {
      console.log('error while loading cache');
    }
  }
  // make tmp directory
  try {
    var stats = fs.statSync('tmp');
    if (!stats.isDirectory()) {
      console.log('error, "tmp" is not a directory');
    }
  } catch (err) {
    if (err.code == 'ENOENT') {
      fs.mkdirSync('tmp');
      console.log('Created "tmp/" -- this is where uploaded files are temporarily stored');
    } else {
      console.log('error while loading tmp directory');
    }
  }
 
};
QWiki.prototype.loadWikiIndex = function() {
  var self = this;
  try {
    this.wiki_index = JSON.parse(fs.readFileSync('index.json'));
  } catch (e) {
    this.wiki_index = { pages: {} };
    console.log(e);
  }
  var wiki_index = this.wiki_index;
  console.log('loaded indices for ' + Object.keys(this.wiki_index.pages).length + ' pages');
  QCore.prototype.readFiles('wiki', function(err, file, is_dir) {
    var wiki_file = file.replace('wiki/', '');
    if (is_dir) {
      if (wiki_file in wiki_index.pages) {
        if (wiki_index.pages[wiki_file].dir != true) wiki_index.pages[wiki_file].dir = true;
      } else {
        wiki_index.pages[wiki_file] = { dir: true };
      }
    } else {
      if (QCore.prototype.getExt(file) == 'qwk') {
        if (wiki_file in wiki_index.pages) {
        } else {
          var name = wiki_file.slice(0, -4);
          wiki_index.pages[name] = { format: 'md' }; // TODO: this.config.default_type
        }
      } else {
        if (wiki_file in wiki_index.pages) {
        } else {
          wiki_index.pages[wiki_file] = { format: 'file' };
        }
      }
    }
  });
}
QWiki.prototype.formats = {
  raw: {
    name: 'raw',
    fullname: 'Raw',
    convert: function(source) {
      return source;
    },
  },
  html: {
    name: 'html',
    fullname: 'HTML',
    convert: function(source) {
      return source;
    }
  }
};
QWiki.prototype.addFormat = function(name, fullname, convertor_cb, pre_cb, post_cb) {
  this.formats[name] = {
    'name': name,
    'fullname': fullname,
    'convert': convertor_cb,
    'pre': pre_cb,
    'post': post_cb 
  };
};
QWiki.prototype.convertAndSave = function(path, name, source, cb) {
  if (typeof cb === 'undefined') cb = function() {};
  if (!(name in this.formats)) {
    name = 'raw';
  }
  console.log('converting to ' + name + ' with path ' + path);
  var converted = this.formats[name].convert(source);
  QCore.prototype.r_mkdir(m_path.dirname('cache/'+path+'.html'), 0777, function() {
    fs.writeFile('cache/'+path+'.html', converted, function(err) {
      if (err) {
        console.log('error writing "cache'+ path + '.html"');
      } else {
        console.log('wrote "cache' + path + '.html"');
      }
      cb();
    });
  });
};
QWiki.prototype.deleteCache = function(wiki_page, cb) {
  fs.unlink('cache/'+wiki_page+'.html', cb);
};
QWiki.prototype.createCache = function(wiki_page, source, cb) {
  if (typeof cb === 'undefined') cb = function() {};
  var format = this.defaults.format;
  if (typeof this.wiki_index.pages[wiki_page] !== 'undefined') {
    format = this.wiki_index.pages[wiki_page].format;
  }
  if (!(format in this.formats)) {
    format = 'raw';
  }
  console.log('createCache: caching ' + wiki_page + ' as ' + format);

  var converted = this.formats[format].convert(source);

  var path = 'cache/' + wiki_page + '.html';

  QCore.prototype.r_mkdir(m_path.dirname(path), 0777, function() {
    fs.writeFile(path, converted, function(err) {
      if (err) {
        console.log('createCache: error writing "' + path + '"');
      } else {
        console.log('createCache: created "' + path + '"');
      }
      cb(err);
    });
  });
};
QWiki.prototype.deletePage = function(wiki_page, cb) {
  fs.unlink('wiki/'+wiki_page+'.qwk', cb);
};
QWiki.prototype.savePage = function(wiki_page, content, cb) {
  var self = this;
  var path = 'wiki/' + wiki_page + '.qwk';
  QCore.prototype.r_mkdir(m_path.dirname(path), 0777, function() {
    console.log('savePage: writing ' + path);
    self.deleteCache(wiki_page, function() {
      fs.writeFile(path, content, function(err) {
        console.log('savePage: wrote ' + path);
        cb(err);
      });
    });
  });
};
QWiki.prototype.deleteFile = function(file, cb) {
  fs.unlink('wiki/'+file, cb);
};

if (require.main === module) {
  var port = 8080;
  process.argv.forEach(function (val, index, array) {
    var parts = val.split('=');
    var key = '';
    var value = '';
    if (parts[0].substr(0, 2) == '--') {
      key = parts[0].substr(2);
      value = parts[1];
    }
    if (key == 'port') {
      if (value == '') {
        console.log(key + ' needs a value');
      } else {
        port = Number(value);
      }
    }
  });

  var qwiki = new QWiki();
  
  qwiki.addMIMEtype('png', 'image/png');
  qwiki.addMIMEtype('jpg', 'image/jpg');
  qwiki.addMIMEtype('svg', 'image/svg+xml');
  qwiki.addMIMEtype('css', 'text/css');
  
  var m_markdownit = require('markdown-it')({
    typographer: true
  });
  m_markdownit.use(require('markdown-it-anchor'));
  m_markdownit.use(require('markdown-it-table-of-contents'), {includeLevel: "2-8"});
  m_markdownit.use(require('markdown-it-deflist'));
  m_markdownit.use(require('markdown-it-header-sections'));
  m_markdownit.use(require('markdown-it-sup'));
  qwiki.addFormat('md', 'Markdown', function(source) {
    // source is a Buffer, but render seems to need a String
    return m_markdownit.render(source.toString());
  });
  
  qwiki.setDefault('format', 'md');
  
  qwiki.listen(port);
}

module.exports = QWiki;