name: "publish-branch"

on:
  push:
    branches-ignore:
      - master

jobs:
  npm-publish:
    name: "Publish"
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: bash

    steps:
      ### Extract branch name
      - name: Extract branch name
        if: github.event_name != 'pull_request'
        run: echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/})" >> $GITHUB_ENV
        id: extract_branch

      - name: Extract branch name
        if: github.event_name == 'pull_request'
        run: echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/})" >> $GITHUB_ENV

      - name: Checkout repository
        uses: actions/checkout@v2

      ### Calculate FINAL_VERSION
      - name: Install jq
        run: sudo apt-get update && sudo apt-get --yes --force-yes install jq

      - name: Get version from npm and increment
        run: |
          # install semver and add it to PATH
          yarn global add semver
          PATH="$(yarn global bin):$PATH"

          # sanitize branch name so it can be used as a semver suffix (replace [^0-9a-zA-Z-] with hyphen)
          SANITIZED_BRANCH="$(echo -n "${{ env.BRANCH_NAME }}" | tr -C '[:alnum:]-' -)"
          # get package name from package.json
          PKG_NAME="$(cat package.json | jq -r .name)"

          # take all versions from npm and replace single quotes with double quotes
          NPM_VERSIONS=$(yarn info --silent "$PKG_NAME" versions 2>/dev/null | tr \' \")
          # take only versions that contain branch name
          NPM_VERSIONS_FILTERED=$(echo $NPM_VERSIONS | jq -r ".[] | select(contains(\"$SANITIZED_BRANCH\"))")
          # flatten into a single line
          NPM_VERSIONS_FLATTENED=$(echo $NPM_VERSIONS_FILTERED | awk '{print}' ORS=' ')
          # sort versions according to semver, take highest (last)
          LAST_NPM_VERSION="$(semver -p $(echo $NPM_VERSIONS_FLATTENED) | tail -n1 || true)"
          # increment prerelease part of the version
          PRERELEASE_NPM_VERSION="$(semver --increment prerelease --preid "$SANITIZED_BRANCH" "${LAST_NPM_VERSION}" || true)"

          # take local version
          LOCAL_VERSION="$(cat package.json | jq -r .version)"
          # set prerelease part on local version
          LOCAL_PRERELEASE_VERSION="$(semver --increment prerelease --preid "$SANITIZED_BRANCH" "${LOCAL_VERSION}-0")" # added '-0' here to avoid semver erroneously increment patch octet. Any suffix works, '-0' is chosen deliberately.

          # take the highest version
          MAX_VERSION="$(semver "$LOCAL_PRERELEASE_VERSION" "$PRERELEASE_NPM_VERSION" | tail -n1)"

          # save info to env
          echo "FINAL_VERSION=$MAX_VERSION" | tee -a $GITHUB_ENV
          echo "PKG_NAME=$PKG_NAME" | tee -a $GITHUB_ENV

      ### Set version
      - name: Set version to ${{ env.FINAL_VERSION }}
        run: yarn version --new-version ${{ env.FINAL_VERSION }} --no-git-tag-version

      ### Publish to NPM registry
      - uses: actions/setup-node@v1
        with:
          node-version: '15'
          registry-url: 'https://registry.npmjs.org'

      - run: cat package.json

      - run: npm i
      - run: npm run build

      - run: npm publish --access public
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}