// Mixin RESTful sync behaviors to Reflux stores. Calls the .completed or .failed
// action when the promise is fufilled.

import sync from './sync';

export default (urlRoot, Actions) => {
  const getUrl = (id) => {
    let base = typeof urlRoot === 'function' ? urlRoot() : urlRoot;
    return id ? `${base}/${id}` : base;
  }

  return {
    // Returns a single model by id, or all models if no id passed.
    fetch(id, params) {
      let method = 'GET';
      let url = getUrl(id);

      sync(url, {method, body: params})
        .then(Actions.fetch.completed)
        .catch(Actions.fetch.failed);
    },

    // Persists a single model to the server. Creates the model if the id doesn't
    // exist, or updates the record if it does.
    save(id, data) {
      let method = id ? 'PUT' : 'POST';
      let url = getUrl(id);

      sync(url, {method, body: data})
        .then(Actions.save.completed)
        .catch(Actions.save.failed);
    },

    // Deletes a single model by id (required).
    delete(id) {
      if (!id) throw new Error('need an id to delete');

      let method = 'DELETE'
      let url = getUrl(id);

      sync(url, {method})
        .then(Actions.delete.completed.bind(this, id))
        .catch(Actions.delete.failed.bind(this, id));
    }
  };
};