#!/usr/bin/env node

const commander = require("commander");
const program = new commander.Command();

const util = require("util");
const exec = util.promisify(require("child_process").exec);

program.parse(process.argv);

function setCurrentBranch(dp) {
  return exec(`git branch|grep '\*'|sed 's/\*\s*//'`)
    .then(x => x.stdout.trim())
    .then(x => Object.assign({}, dp, { currentBranch: x }));
}

function setStandardBranches(dp) {
  return Object.assign({}, dp, { standardBranches: ["master", "release"] });
}

function validateCurrentBranch(dp) {
  if (!dp.standardBranches.includes(dp.currentBranch)) {
    throw `invalid base branch: ${dp.currentBranch}`;
  } else {
    return dp;
  }
}

function validateFeatureBranch(dp) {
  if (dp.standardBranches.includes(dp.featureName)) {
    throw `invalid feature branch: ${dp.featureName}`;
  } else {
    return dp;
  }
}

function setFeatureName(dp) {
  const fn = program.args.join("-");
  return Object.assign({}, dp, { featureName: fn });
}

function setPrefix(dp) {
  const p = process.env.FEATURE_USER || process.env.USER;
  return Object.assign({}, dp, { prefix: p });
}

function setFeatureBranch(dp) {
  const fb = `${dp.prefix}-${dp.currentBranch}-${dp.featureName}`;
  return Object.assign({}, dp, { featureBranch: fb });
}

const x = Promise.resolve({ program })
  .then(setStandardBranches)
  .then(setFeatureName)
  .then(setPrefix)
  .then(setCurrentBranch)
  .then(validateCurrentBranch)
  .then(setFeatureBranch)
  .then(validateFeatureBranch)
  .then(x => console.log("x", x))
  .catch(err => console.error(err));