var fs = require('fs');
module.exports = function(qwiki) {
  qwiki.rule('', '@@CONTENT@@', function(req, res, instance, next) {
    if (req.area == '/' || req.area == '') {
      qwiki.rules['updates']['@@CONTENT@@'](req, res, instance, next);
      return;
    } else {
      for (var listing in qwiki.listings) {
        if (req.area.substring(1, listing.length+1) == listing) {
          req.listing = listing;
          qwiki.rules['listing']['@@CONTENT@@'](req, res, instance, next);
          return;
        }
      }
    }
 		// instance.pos, instance.offset, instance.indices
 		var cache_path = 'cache/'+req.area+'.html';
 		res.write('<div class="content_row" id="bot">');
 		res.write('<div class="right">');
 		qwiki.readFile(res, cache_path, function(type, err) {
 		  if (type == 'FNF') {
 		    // cache does not exist - is there a wiki source?
 		    var wiki_path = 'wiki/'+req.area+'.qwk';
 		    fs.stat(wiki_path, function(err, stats) {
 		      // TODO: stats.isFile()
 		      if (err && err.code == 'ENOENT') {
 		        // the wiki entry does not exist
 		        res.write(req.area + ' does not exist yet');
 		        res.write('</div></div>');
 		        next();
 		      } else if (err) {
 		        // error while statting wiki entry
 		        res.write(req.area + ': ' + err.code);
 		        res.write('</div></div>');
 		        next();
 		      } else {
 		        // wiki entry exists!
 		        fs.readFile(wiki_path, function(err, data) {
 		          if (err) {
 		            res.write(req.area + ': ' + err.code);
 		            res.write('</div></div>');
 		            next();
 		          } else {
 		            qwiki.convertAndSave(req.area, (req.area in qwiki.wiki_index.pages ? qwiki.wiki_index.pages[req.area].format : qwiki.getDefault('format')), data, function() {
 		              qwiki.readFile(res, wiki_path, function(type, err) {
 		                if (type == 'FNF') {
 		                  res.write('error while creating cache');
 		                  res.write('</div></div>');
 		                  next();
 		                } else if (err) {
 		                  res.write(req.area + ': ' + err.code);
 		                  res.write('</div></div>');
 		                  next();
 		                } else {
 		                  res.write('</div></div>');
 		                  next();
 		                }
 		              });
 		            });
 		          }
 		        });
 		      }
 		    });
 		  } else if (err) {
 		    res.write(req.area + ': ' + err.code);
 		    res.write('</div></div>');
 		    next();
 		  } else {
 		    res.write('</div></div>');
 		    next();
 		  }
 		});
  });
  qwiki.rule('', '@@TITLE@@', function(req, res, instance, next) {
    res.write('qwiki ' + req.area);
    next();
  });
  qwiki.rule('', '@@PAGE@@', function(req, res, instance, next) {
    res.write(req.area);
    next();
  });
  qwiki.rule('', '@@CRUMBS@@', function(req, res, instance, next) {
    var parts = req.area.split('/');
    var path = '';
    parts[0] = '>';
    for (var i = 0; i < parts.length; i++) {
      path += (i == 0 ? '/' : parts[i]);
      res.write('<li><a href="'+path+'">'+parts[i]+'</a></li>');
      path += (i == 0 ? '' : '/');
    }
    next();
  });
  qwiki.rule('', '@@FOOTER@@', function(req, res, instance, next) {
    res.write('<a href="http://kettek.net/qwiki">qwiki</a> Copyright 2015 <a href="http://kettek.net">kts of kettek</a>');
    next();
  });
  qwiki.rule('', '@@QAT@@', function(req, res, instance, next) {
    var d = new Date;
    d.setHours(0, 0, 0, 0, 0);
    res.write(qwiki.qats[d % (qwiki.qats.length-1)].render);
    next();
  });
  qwiki.act('', function(req, res) {
    var ext = qwiki.getExt(req.area);
    var mimetype = qwiki.getMIMEtype(qwiki.getExt(req.area));
    if (mimetype == '') mimetype = 'application/octet-stream';
    if (ext !== '') { // write file on disk directly
      var path = 'wiki/'+req.area;
      fs.stat(path, function(err, stat) {
        if (err == null) {
          // TODO: etags should actually be based on binary data(CRC32, etc.), not last modified
          // TODO: files should not be stat()`d each call, but should be cached and updated when the file updates (how? browser-based upload interface?)
          var mtime = stat.mtime.getTime();
          if (!(path in qwiki.etags) || qwiki.etags[path] != mtime) {
            qwiki.etags[path] = mtime;
          }
					res.setHeader("Access-Control-Allow-Origin", "*");
			    //res.header("Access-Control-Allow-Credentials", "true");
			    res.setHeader("Access-Control-Allow-Headers", "Origin,Content-Type, Authorization, x-id, Content-Length, X-Requested-With");
			    res.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
          if ('if-none-match' in req.headers && req.headers['if-none-match'] == qwiki.etags[path]) {
            res.writeHead(304, "Not Modified");
            res.end();
          } else {
            res.writeHead(200, "OK", {
              "Content-Type": mimetype,
              "Content-Length": stat.size,
              "ETag": mtime
            });
            var rs = fs.createReadStream(path);
            rs.on('data', function(chunk) {
              res.write(chunk);
            });
            rs.on('end', function() {
              res.end();
            });
          }
        } else if (err.code == 'ENOENT') {
          res.writeHead(404);
          res.end();
        } else {
          console.log(err);
          res.write(err.message);
          res.end();
        }
      });
    } else {
			var path = 'wiki/'+req.area+'.qwk';
			fs.stat(path, function(err, stat) {
				if (err == null) {
		      res.writeHead(200, "OK", {
		        "Content-Type": "text/html",
		      });
		      qwiki.parsePage('', '', req, res);
				} else {
      		var path = 'wiki/'+req.area+'/index.html';
      		fs.stat(path, function(err, stat) {
		        if (err == null) {
							if (req.url[req.url.length-1] !== '/') {
					      res.writeHead(302, {
									'Location': req.url+'/'
								});
								res.end();
							} else {
								var rstream = fs.createReadStream(path);
								rstream.on('error', function(err) {
									res.writeHead(500);
									res.end();
								});
								res.statusCode = 200;
								rstream.pipe(res);
							}
						} else {
				      res.writeHead(200, "OK", {
				        "Content-Type": "text/html",
				      });
				      qwiki.parsePage('', '', req, res);
						}
					});
				}
			});
    }
  });
};