export default {
  changeTypes: [
    {
      title: '💥 Breaking changes',
      labels: ['breaking', 'Type:Breaking-Change'],
      bump: 'major',
      weight: 3
    },
    {
      title: '🔒 Security',
      labels: ['security', 'Type:Security'],
      bump: 'patch',
      weight: 2
    },
    {
      title: '✨ Features',
      labels: ['feature', 'Type:Feature'],
      bump: 'minor',
      weight: 1
    },
    {
      title: '📈 Enhancement',
      labels: ['enhancement', 'refactor', 'Type:Enhancement'],
      bump: 'minor'
    },
    {
      title: '🐛 Bug Fixes',
      labels: ['bug', 'Type:Bug'],
      bump: 'patch'
    },
    {
      title: '📦️ Dependencies',
      labels: ['dependency', 'dependencies', 'Type:Dependencies'],
      bump: 'patch',
      weight: -1
    }
  ],
  useVersionPrefixV: true,
  getLatestTag: ({ exec }) => {
    // the plugin uses the latest tag to determine the next version
    // and the changes that are included in the upcoming release.
    const branch = getBranch(exec)
    let tags = getTags(exec)

    if (branch.startsWith('stable-')) {
      const [_, majorAndMinor] = branch.split('-')
      // we only care about tags that are within the range of the current stable branch.
      // e.g. if the branch is stable-1.2, we only care about tags that are v1.2.x.
      const matchingTags = tags.filter((t) => t.startsWith(`v${majorAndMinor}`))

      if (matchingTags.length) {
        tags = matchingTags
      }
    }

    return tags.pop() || 'v0.0.0'
  },
  useLatestRelease: ({ exec, nextVersion }) => {
    // check if the release should be marked as latest release on GitHub.
    const tags = getTags(exec)
    const latestTag = tags.pop() || 'v0.0.0'
    return compareVersions(latestTag, nextVersion) === -1
  }
}

const parseVersion = (tag: string) => {
  const version = tag.startsWith('v') ? tag.slice(1) : tag
  const [main, pre] = version.split('-')
  const [major, minor, patch] = main.split('.').map(Number)
  return { major, minor, patch, pre }
}

const getBranch = (exec: any): string => {
  return exec('git rev-parse --abbrev-ref HEAD', {
    silent: true
  }).stdout.trim()
}

const getTags = (exec: any) => {
  exec('git fetch --tags', { silent: true })
  const tagsOutput = exec('git tag', { silent: true }).stdout.trim()
  const tags: string[] = tagsOutput ? tagsOutput.split('\n') : []
  return tags.filter((tag) => tag.startsWith('v')).sort(compareVersions)
}

const compareVersions = (a: string, b: string) => {
  const va = parseVersion(a)
  const vb = parseVersion(b)

  if (va.major !== vb.major) {
    return va.major - vb.major
  }
  if (va.minor !== vb.minor) {
    return va.minor - vb.minor
  }
  if (va.patch !== vb.patch) {
    return va.patch - vb.patch
  }

  if (va.pre && !vb.pre) {
    return -1
  }
  if (!va.pre && vb.pre) {
    return 1
  }

  if (va.pre && vb.pre) {
    return va.pre.localeCompare(vb.pre)
  }

  return 0
}