var path = require('path');
var fs = require('fs');
module.exports = function(qwiki) {
  qwiki.act('upload', function(req, res) {
    res.writeHead(200, "OK", {
      "Content-Type": "text/html",
    });
    qwiki.parsePage('upload', '', req, res);
  });
  qwiki.rule('upload', '@@CONTENT@@', function(req, res, instance, next) {
    res.write('<h2>Upload</h2>');
    var wiki_path = process.cwd() + '/wiki/';
    if (typeof req.files.file !== 'undefined') {
      var loc_path = (typeof req.fields.location !== 'undefined' ? req.fields.location+'/' : req.url+'/');
      var total = 0;
      if (req.files.file instanceof Array) {
        for (var i = 0, len = req.files.file.length; i < len; i++) {
          var file = req.files.file[i];
          var full_path = path.normalize(wiki_path + loc_path + encodeURIComponent(file.name));
          if (full_path.indexOf(wiki_path) == -1) {
            // TODO: actually show the error to user
            res.write('DENIED: Attempted location is out of wiki context.');
            end(req, res);
            next();
            return;
          }
          moveFile(file.path, full_path, function(err) {
            res.write('Uploaded: ' + path.basename(full_path) + '<br>');
            total++;
            if (total >= len) {
              end(req, res);
              next();
              return;
            }
          });
        }
      } else {
        var file = req.files.file;
        var full_path = path.normalize(wiki_path + loc_path + encodeURIComponent(file.name));
        if (full_path.indexOf(wiki_path) == -1) {
          res.write('DENIED: Attempted location is out of wiki context.');
          end();
          next();
          return;
        }
        moveFile(file.path, full_path, function(err) {
          res.write('Uploaded: ' + path.basename(full_path) + '<br>');
          end(req, res);
          next();
        });
      }
      return;
    }
    end(req, res);
    next();
  });

  function end(req, res) {
    res.write('<form enctype="multipart/form-data" action="" method="POST"><div class="edit">');
    res.write('<div><label for="file"><span>These are the file(s) to upload</span>File(s)</label> <input type="file" name="file" multiple></div>');
    res.write('<div><label for="location"><span>This is the target location to save the file(s) to</span>Location</label> <input type="text" name="location" value="'+req.url+'"></div>');
    res.write('</div>');
    res.write('<div class="prompt"><input type="submit" name="submit" value="Upload"></div>');
    res.write('</form>');
  };

  function moveFile(from, to, cb) {
    qwiki.r_mkdir(path.dirname(to), 0777, function() {
      fs.rename(from, to, function(err) {
        cb(err);
      });
    });
  };
};