'use strict'

const compareFunc = require('compare-func')
const Q = require('q')
const readFile = Q.denodeify(require('fs').readFile)
const resolve = require('path').resolve

module.exports = Q.all([
  readFile(resolve(__dirname, './templates/template.hbs'), 'utf-8'),
  readFile(resolve(__dirname, './templates/header.hbs'), 'utf-8'),
  readFile(resolve(__dirname, './templates/commit.hbs'), 'utf-8'),
  readFile(resolve(__dirname, './templates/footer.hbs'), 'utf-8')
])
  .spread((template, header, commit, footer) => {
    const writerOpts = getWriterOpts()

    writerOpts.mainTemplate = template
    writerOpts.headerPartial = header
    writerOpts.commitPartial = commit
    writerOpts.footerPartial = footer

    return writerOpts
  })

function getWriterOpts () {
  return {
    transform: (commit) => {
      const type = commit.type ? commit.type.toUpperCase() : ''

      if (type === 'FEAT') {
        commit.type = 'Features'
      } else if (type === 'FIX') {
        commit.type = 'Bug Fixes'
      } else {
        return
      }

      if (typeof commit.hash === 'string') {
        commit.hash = commit.hash.substring(0, 7)
      }

      commit.notes.forEach(note => {
        if (note.title === 'BREAKING CHANGE') {
          note.title = 'BREAKING CHANGES'
        }
      })

      return commit
    },
    groupBy: 'type',
    commitGroupsSort: 'title',
    commitsSort: ['type', 'shortDesc'],
    noteGroupsSort: 'title',
    notesSort: compareFunc
  }
}