import fs from 'fs';
import { join } from 'path';

function readFile(path: string): Promise<string> {
  return new Promise((resolve, reject) => {
    fs.readFile(path, 'utf8', (error, content) => {
      if (error) {
        reject(error);
      } else {
        resolve(content);
      }
    });
  });
}

export async function loadDefaultState(appBundleDirectory: string) {
  const examples = await readFile(
    join(appBundleDirectory, 'static', 'examples', 'list')
  );
  const examplesList = JSON.parse(examples);
  const defaultState = {
    compile: {},
    dryRun: {},
    deploy: {},
    evaluateValue: {},
    evaluateFunction: {},
    editor: {},
    examples: {
      selected: null,
      list: examplesList
    }
  };

  if (examplesList[0]) {
    const example = await readFile(
      join(appBundleDirectory, 'static', 'examples', examplesList[0].id)
    );
    const defaultExample = JSON.parse(example);

    defaultState.compile = defaultExample.compile;
    defaultState.dryRun = defaultExample.dryRun;
    defaultState.deploy = defaultExample.deploy;
    defaultState.evaluateValue = defaultExample.evaluateValue;
    defaultState.evaluateFunction = defaultExample.evaluateFunction;
    defaultState.editor = defaultExample.editor;
    defaultState.examples.selected = defaultExample;
  }

  return defaultState;
}