#!/usr/bin/env node

const _ = require("lodash");

const path = x => require("../" + x);
const immutable = path("js/immutable");
const git = path("js/git");
const shell = path("js/shell");
const commander = path("js/commander");
const branch = path("js/branch");

function validateCurrentBranch(dp) {
  if (branch.isNonStandard(dp.branch.current)) {
    throw `invalid base branch: ${dp.branch.current}`;
  } else {
    return dp;
  }
}

function validateFeatureName(dp) {
  if (branch.isStandard(commander.featureName())) {
    throw `invalid feature branch: ${commander.featureName()}`;
  } else {
    return dp;
  }
}

function setFeatureBranch(dp) {
  const fb = [
    commander.prefix(),
    dp.branch.current,
    commander.featureName()
  ].join("-");
  return immutable.set(dp, "branch.feature", fb);
}

function createFeatureBranch(dp) {
  return shell.pipeline([
    "git fetch --prune --prune-tags --tags origin",
    `git merge origin/${dp.branch.current}`,
    "git push",
    `git checkout -b ${dp.branch.feature}`,
    `git push -u origin ${dp.branch.feature}`
  ]);
}

function toPromise(dp) {
  return Promise.resolve(dp);
}

const x = toPromise(commander.parse())
  .then(validateFeatureName)
  .then(git.setCurrentBranch)
  .then(validateCurrentBranch)
  .then(setFeatureBranch)
  .then(createFeatureBranch)
  .catch(err => console.error(err));