name: Update version on pr approval

on:
  pull_request_review:
    types: [submitted]
  issue_comment:
    types: [created]

jobs:
  update_version:
    if: >
      ( github.event_name == 'pull_request_review' &&
        github.event.review.state == 'approved' &&
        ( github.event.review.author_association == 'OWNER' ||
          github.event.review.author_association == 'MEMBER'
        ) &&
        ! contains( github.event.review.body, '@github-actions noop' )
      ) ||
      ( github.event_name == 'issue_comment' &&
        github.event.issue.pull_request &&
        ( github.event.comment.author_association == 'OWNER' ||
          github.event.comment.author_association == 'MEMBER'
        ) &&
        endsWith( github.event.comment.body, '@github-actions update version' )
      )
    runs-on: ubuntu-latest
    steps:
      - name: Get proper pr info
        id: configure
        env:
          EVENT: ${{github.event_name}}
          NUMBER: ${{github.event.issue.number}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
          REF: ${{github.event.pull_request.head.ref}}
          REPO_PAGE: ${{github.event.pull_request.head.repo.svn_url}}
          REPO_NAME: ${{github.event.pull_request.head.repo.full_name}}
          UPSTREAM: ${{github.event.pull_request.base.repo.clone_url}}
          LINK: ${{github.event.pull_request.html}}
        run: |
          if [[ $EVENT == "issue_comment" ]]; then
            tmp="$(mktemp)"
            api="$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/pulls/$NUMBER"
            echo "fetching $api"
            gh api "$api" >"$tmp"
            REF="$(jq -r ".head.ref" "$tmp")"
            REPO_PAGE="$(jq -r ".head.repo.svn_url" "$tmp")"
            REPO_NAME="$(jq -r ".head.repo.full_name" "$tmp")"
            UPSTREAM="$(jq -r ".base.repo.clone_url" "$tmp")"
            LINK="${{github.event.issue.html_url}}"
          fi
          echo "::set-output name=link::$LINK"
          echo "::set-output name=ref::$REF"
          echo "::set-output name=page::$REPO_PAGE"
          echo "::set-output name=name::$REPO_NAME"
          echo "::set-output name=upstream::$UPSTREAM"

      - name: Checkout pull request
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          repository: ${{steps.configure.outputs.name}}
          ref: ${{steps.configure.outputs.ref}}

      - name: Check for changes
        id: check
        shell: bash
        env:
          UPSTREAM: ${{steps.configure.outputs.upstream}}
          LINK: ${{steps.configure.outputs.link}}
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com
          git fetch "$UPSTREAM"
          if ! git merge FETCH_HEAD; then
            echo "::error::failed to merge pull request"
            echo "::notice::you can resolve merge conflicts at $LINK/conflicts"
            exit 2
          elif git diff --quiet FETCH_HEAD tokens.xml; then
            echo "::set-output name=update::false"
          else
            echo "::set-output name=update::true"
          fi

      - name: Get date
        if: steps.check.outputs.update == 'true'
        id: date
        shell: bash
        run: |
          git checkout FETCH_HEAD version.txt
          previous="$(<version.txt)"
          date="$(date --utc +%Y%m%d)"
          echo "it is currently $date"
          echo "::set-output name=date::$date"
          echo "::set-output name=previous::$previous"

      - name: Check for suffix used when multiple changes happen in a day
        if: steps.check.outputs.update == 'true'
        id: version
        shell: python
        run: |
          import re
          previous = "${{steps.date.outputs.previous}}"
          date = "${{steps.date.outputs.date}}"
          version = date
          if previous.startswith(date):
            match = re.search(r"[a-z]+", previous)
            if match is None:
              suffix = "a" # the first a is actually hidden
            else:
              suffix = match[0]
            charlist = []
            rev = reversed(suffix)
            for char in rev:
              if char == "z":
                charlist.append("a")
              else:
                nextchar = chr(ord(char) + 1)
                charlist.append(nextchar)
                charlist.extend(rev)
                break
            else:
              charlist.append("a")
            version += "".join(reversed(charlist))
          print(f"::set-output name=version::{version}")

      - name: Update date in files
        if: steps.check.outputs.update == 'true'
        shell: bash
        env:
          VERSION: ${{steps.version.outputs.version}}
          PREVIOUS: ${{steps.date.outputs.previous}}
        run: |
          echo "updating version from $PREVIOUS to $VERSION"
          tag="sourceVersion"
          sed -i "s?<$tag>.*</$tag>?<$tag>$VERSION</$tag>?" tokens.xml
          echo "$VERSION" >version.txt

      - name: Push changes
        shell: bash
        env:
          REPO_PAGE: ${{steps.configure.outputs.page}}
          VERSION: ${{steps.version.outputs.version}}
        run: |
          if git diff --quiet tokens.xml; then
            echo "there are no changes to tokens.xml"
            echo "::notice::no commit created"
            exit 0
          fi
          git add tokens.xml version.txt
          git commit -m "update version to $VERSION"
          git push
          commit="$(git rev-parse HEAD)"
          echo "::notice::pushed commit: $REPO_PAGE/commit/$commit"