import localDbSvc from './localDbSvc';
import store from '../store';
import welcomeFile from '../data/welcomeFile.md';
import utils from './utils';

const ifNoId = cb => (obj) => {
  if (obj.id) {
    return obj;
  }
  return cb();
};

// Watch file changing
store.watch(
  () => store.getters['files/current'].id,
  () => Promise.resolve(store.getters['files/current'])
    // If current file has no ID, get the most recent file
    .then(ifNoId(() => store.getters['files/mostRecent']))
    // If no ID, load the DB (we're booting)
    .then(ifNoId(() => localDbSvc.sync()
      // Retry
      .then(() => store.getters['files/current'])
      .then(ifNoId(() => store.getters['files/mostRecent'])),
    ))
    // Finally create a new file
    .then(ifNoId(() => {
      const contentId = utils.uid();
      store.commit('contents/setItem', {
        id: contentId,
        text: welcomeFile,
      });
      const fileId = utils.uid();
      store.commit('files/setItem', {
        id: fileId,
        name: 'Welcome file',
        contentId,
      });
      return store.state.files.itemMap[fileId];
    }))
    .then((currentFile) => {
      store.commit('files/patchItem', { id: currentFile.id });
      store.commit('files/setCurrentId', currentFile.id);
    }),
  {
    immediate: true,
  });

utils.setInterval(() => localDbSvc.sync(), 1200);