name: Update README and create release

on:
  push:
    branches:
      - master
  create:
    tags:
      - "*"
  repository_dispatch:
    types:
      - readme-release

jobs:
  create-and-release:
    runs-on: ubuntu-latest
    env:
      VERSIONTAG_THIS: ""
    steps:
      - name: Checkout
        if: >
          (github.event_name == 'push' && github.ref == 'refs/heads/master')
          || (github.event_name == 'create' && github.event.ref_type == 'tag')
          || github.event_name == 'repository_dispatch'
        uses: actions/checkout@v2
        with:
          ref: master
          fetch-depth: 0
      - name: Update README
        if: >
          (github.event_name == 'push' && github.ref == 'refs/heads/master')
          || github.event_name == 'repository_dispatch'
        run: |
          ./scripts/update-readme
          if ! git ls-files -m | grep -qE '^README\.md$'; then
            echo 'README.md has not been changed'
          else
            echo 'README.md has been updated'
            git config user.name 'Michele Locati'
            git config user.email 'michele@locati.it'
            git add README.md
            git commit -m '[skip ci] Automatically update README.md'
            git push
          fi
      - name: Looking for the recent version tags
        if: >
          (github.event_name == 'push' && github.ref == 'refs/heads/master')
          || (github.event_name == 'create' && github.event.ref_type == 'tag')
          || github.event_name == 'repository_dispatch'
        run: |
          TAGS="$(git tag --list --sort=-version:refname)"
          VERSIONTAG_LAST=
          VERSIONTAG_PENULTIMATE=
          for TAG in $(git tag --list --sort=-version:refname); do
            if printf '%s' "$TAG" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'; then
              if test -z "$VERSIONTAG_LAST"; then
                VERSIONTAG_LAST="$TAG"
              else
                VERSIONTAG_PENULTIMATE="$TAG"
                break
              fi
            fi
          done
          if test -z "$VERSIONTAG_LAST"; then
            printf 'Most recent version tag: <none>\n'
          else
            printf 'Most recent version tag: %s\n' "$VERSIONTAG_LAST"
          fi
          printf 'VERSIONTAG_LAST=%s\n' "$VERSIONTAG_LAST" >> "$GITHUB_ENV"
          printf 'VERSIONTAG_PENULTIMATE=%s\n' "$VERSIONTAG_PENULTIMATE" >> "$GITHUB_ENV"
      - name: Checking if we need to create a version tag after a push
        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
        run: |
          VERSIONTAG_THIS=
          if test -z "$VERSIONTAG_LAST"; then
            printf 'We need to create the first version tag\n'
            VERSIONTAG_THIS=1.0.0
          elif test "$(git rev-parse HEAD)" = "$(git rev-list -n 1 "refs/tags/$VERSIONTAG_LAST")"; then
            printf 'Another action should already take care of creating the release\n'
          else
            CREATE_TAG=n
            for CHANGED_FILE in $(git diff --name-only "refs/tags/$VERSIONTAG_LAST" HEAD); do
              case "$CHANGED_FILE" in
                install-php-extensions)
                  CREATE_TAG=y
                  ;;
              esac
            done
            if test "$CREATE_TAG" = 'y'; then
              VERSIONTAG_THIS="${VERSIONTAG_LAST%.*}.$((${VERSIONTAG_LAST##*.}+1))"
              printf 'We need to create new version tag %s since relevant files changed\n' "$VERSIONTAG_THIS"
            else
              printf 'We do not need to create a new version tag since no relevant files changed\n'
            fi
          fi
          printf 'VERSIONTAG_THIS=%s\n' "$VERSIONTAG_THIS" >> "$GITHUB_ENV"
          printf 'VERSIONTAG_PREVIOUS=%s\n' "$VERSIONTAG_LAST" >> "$GITHUB_ENV"
      - name: Sleep for a while before creating a tag
        if: env.VERSIONTAG_THIS != ''
        uses: juliangruber/sleep-action@v1
        with:
          time: 30s
      - name: Create version tag after a push in the local repository
        if: env.VERSIONTAG_THIS != ''
        run: |
          git tag -- "$VERSIONTAG_THIS"
          printf 'VERSIONTAG_THIS_SHA=%s\n' "$(git rev-parse HEAD)" >> "$GITHUB_ENV"
      - name: Create version tag after a push in the remote repository
        if: env.VERSIONTAG_THIS != ''
        uses: actions/github-script@v3
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            github.git.createRef({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: `refs/tags/${process.env.VERSIONTAG_THIS}`,
              sha: process.env.VERSIONTAG_THIS_SHA
            })
      - name: Check format of received tag
        if: github.event_name == 'create' && github.event.ref_type == 'tag'
        run: |
          VERSIONTAG_THIS="${GITHUB_REF#refs/tags/}"
          if test "$VERSIONTAG_THIS" = "$VERSIONTAG_LAST"; then
            if printf '%s' "$VERSIONTAG_THIS" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'; then
              printf 'Tag %s is version-like\n' "$VERSIONTAG_THIS"
            else
              printf 'Tag %s is not version-like\n' "$VERSIONTAG_THIS"
              VERSIONTAG_THIS=
            fi
          else
              printf 'Last created tag %s is not %\n' "$VERSIONTAG_THIS" "$VERSIONTAG_LAST"
              VERSIONTAG_THIS=
          fi
          printf 'VERSIONTAG_THIS=%s\n' "$VERSIONTAG_THIS" >> "$GITHUB_ENV"
          printf 'VERSIONTAG_PREVIOUS=%s\n' "$VERSIONTAG_PENULTIMATE" >> "$GITHUB_ENV"
      - name: Extract release notes
        if: env.VERSIONTAG_THIS != ''
        run: |
          printf 'Generating release notes for tag %s\n' "$VERSIONTAG_THIS"
          if test -z "$VERSIONTAG_PREVIOUS"; then
            echo 'No previous tag found'
            RELEASE_NOTES='First version'
          else
            printf 'Generating release notes for commits between %s and %s\n' "$VERSIONTAG_PREVIOUS" "$VERSIONTAG_THIS"
            RELEASE_NOTES="$(git log --format='- %s' --no-merges --reverse "refs/tags/$VERSIONTAG_PREVIOUS...refs/tags/$VERSIONTAG_THIS" -- ./install-php-extensions)"
          fi
          printf 'Release notes:\n%s\n' "$RELEASE_NOTES"
          printf 'RELEASE_NAME=v%s\n' "$VERSIONTAG_THIS" >> "$GITHUB_ENV"
          printf 'RELEASE_NOTES<<EOF\n%s\nEOF\n' "$RELEASE_NOTES" >> "$GITHUB_ENV"
      - name: Login to Docker Hub
        if: env.VERSIONTAG_THIS != ''
        uses: docker/login-action@v1
        with:
          username: mlocati
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build docker image and push to Docker Hub
        uses: docker/build-push-action@v2
        if: env.VERSIONTAG_THIS != ''
        with:
          push: true
          tags: |
            mlocati/php-extension-installer:${{ env.VERSIONTAG_THIS }}
            mlocati/php-extension-installer:latest
      - name: Create release
        id: create_release
        if: env.VERSIONTAG_THIS != ''
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ env.VERSIONTAG_THIS }}
          release_name: ${{ env.RELEASE_NAME }}
          body: ${{ env.RELEASE_NOTES }}
          draft: true
          prerelease: false
      - name: Upload release asset
        if: env.VERSIONTAG_THIS != ''
        uses: actions/upload-release-asset@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          upload_url: ${{ steps.create_release.outputs.upload_url }}
          asset_path: ./install-php-extensions
          asset_name: install-php-extensions
          asset_content_type: application/octet-stream