// These methods handle the 'classes' routes.
// Methods of the form 'handleX' return promises and are intended to
// be used with the PromiseRouter.

var Parse = require('parse/node').Parse,
    PromiseRouter = require('./PromiseRouter'),
    rest = require('./rest');

var router = new PromiseRouter();

// Returns a promise that resolves to a {response} object.
function handleFind(req) {
  var options = {};
  if (req.body.skip) {
    options.skip = Number(req.body.skip);
  }
  if (req.body.limit) {
    options.limit = Number(req.body.limit);
  }
  if (req.body.order) {
    options.order = String(req.body.order);
  }
  if (req.body.count) {
    options.count = true;
  }
  if (typeof req.body.keys == 'string') {
    options.keys = req.body.keys;
  }
  if (req.body.include) {
    options.include = String(req.body.include);
  }
  if (req.body.redirectClassNameForKey) {
    options.redirectClassNameForKey = String(req.body.redirectClassNameForKey);
  }

  return rest.find(req.config, req.auth,
                   req.params.className, req.body.where, options)
    .then((response) => {
      return {response: response};
    });
}

// Returns a promise for a {status, response, location} object.
function handleCreate(req) {
  return rest.create(req.config, req.auth,
                     req.params.className, req.body);
}

// Returns a promise for a {response} object.
function handleGet(req) {
  return rest.find(req.config, req.auth,
                   req.params.className, {objectId: req.params.objectId})
    .then((response) => {
      if (!response.results || response.results.length == 0) {
        throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND,
                              'Object not found.');
      } else {
        return {response: response.results[0]};
      }
    });
}

// Returns a promise for a {response} object.
function handleDelete(req) {
  return rest.del(req.config, req.auth,
                  req.params.className, req.params.objectId)
    .then(() => {
      return {response: {}};
    });
}

// Returns a promise for a {response} object.
function handleUpdate(req) {
  return rest.update(req.config, req.auth,
                     req.params.className, req.params.objectId, req.body)
    .then((response) => {
      return {response: response};
    });
}

router.route('GET', '/classes/:className', handleFind);
router.route('POST', '/classes/:className', handleCreate);
router.route('GET', '/classes/:className/:objectId', handleGet);
router.route('DELETE',  '/classes/:className/:objectId', handleDelete);
router.route('PUT', '/classes/:className/:objectId', handleUpdate);

module.exports = router;