import {
  setData,
  getData,
  watchData
} from './data';

import storybook from './storybook';

export function storiesOf(kind, m) {
  // XXX: Add a better way to create stories and mutate them.
  m.hot.dispose(() => {
    delete storybook[kind];
  });

  storybook[kind] = {};
  function add(storyName, fn) {
    storybook[kind][storyName] = fn;

    const _storybook = {};
    Object.keys(storybook).forEach(kind => {
      const stories = storybook[kind]
      _storybook[kind] = Object.keys(stories);
    });

    setData({storybook: _storybook});
    return {add};
  }

  return {add};
}

export function action(name) {
  return function(...args) {
    let {actions = []} = getData();
    actions = [{name, args}].concat(actions);
    setData({actions});
  }
}

export function getStories() {
  return storybook;
}

export function configure(loaders, module) {
  let render = () => {
    function renderApp() {
      loaders();
      renderMain(getStories());
    }

    try {
      renderApp()
    } catch (error) {
      renderError(error)
    }
  }

  if (module.hot) {
    module.hot.accept(() => {
      setTimeout(render)
    })
  }

  render()
}

export function renderMain(stories) {
  const data = getData();
  data.error = null;

  data.selectedKind =
    (storybook[data.selectedKind])? data.selectedKind : Object.keys(storybook)[0];

  if (data.selectedKind) {
    const stories = storybook[data.selectedKind];
    data.selectedStory =
      (stories[data.selectedStory])? data.selectedStory : Object.keys(stories)[0];
  }

  setData(data);
};

export const renderError = (e) => {
  const data = getData();
  const {stack, message} = e;
  data.error = {stack, message};

  setData(data);
};