const transformCommitType = (type) => {
  const commitTypeMapping = {
    feat: 'Features',
    fix: 'Bug Fixes',
    perf: 'Performance Improvements',
    revert: 'Reverts',
    docs: 'Documentation',
    style: 'Styles',
    refactor: 'Code Refactoring',
    test: 'Tests',
    build: 'Build System',
    ci: 'Continuous Integration',
    chore: 'Chores',
    default: 'Miscellaneous',
  }
  return commitTypeMapping[type] || commitTypeMapping['default']
}

const customTransform = (commit, context) => {
  const issues = []

  commit.notes.forEach((note) => {
    note.title = `BREAKING CHANGES`
  })

  commit.type = transformCommitType(commit.type)

  if (commit.scope === '*') {
    commit.scope = ''
  }

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

  if (typeof commit.subject === `string`) {
    let url = context.repository
      ? `${context.host}/${context.owner}/${context.repository}`
      : context.repoUrl
    if (url) {
      url = `${url}/issues/`
      // Issue URLs.
      commit.subject = commit.subject.replace(/#([0-9]+)/g, (_, issue) => {
        issues.push(issue)
        return `[#${issue}](${url}${issue})`
      })
    }
    if (context.host) {
      // User URLs.
      commit.subject = commit.subject.replace(
        /\B@([a-z0-9](?:-?[a-z0-9/]){0,38})/g,
        (_, username) => {
          if (username.includes('/')) {
            return `@${username}`
          }

          return `[@${username}](${context.host}/${username})`
        },
      )
    }
  }

  // remove references that already appear in the subject
  commit.references = commit.references.filter((reference) => {
    if (issues.indexOf(reference.issue) === -1) {
      return true
    }

    return false
  })

  return commit
}

module.exports = {
  branch: 'master',
  parserOpts: {
    mergePattern: /^Merge pull request #(\d+) from (.*)$/,
    mergeCorrespondence: ['id', 'source'],
  },
  writerOpts: { transform: customTransform },
  plugins: [
    ['@semantic-release/commit-analyzer'],
    '@semantic-release/release-notes-generator',
    [
      '@semantic-release/changelog',
      {
        changelogFile: 'docs/CHANGELOG.md',
        changelogTitle:
          '# Changelog\n\nAll notable changes to this project will be documented in this file. See\n[Conventional Commits](https://conventionalcommits.org) for commit guidelines.',
      },
    ],
    ['@semantic-release/npm', { npmPublish: false }],
    '@semantic-release/github',
    [
      '@semantic-release/git',
      { assets: ['docs/CHANGELOG.md', 'package.json'] },
    ],
  ],
}