name: Update version on tokens.xml changes

on:
  push:
    branches: [ master ]
    paths:
      - 'tokens.xml'
      - 'version.txt'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ !contains(github.ref, '/master') }}

jobs:
  update_version:
    if: "!startsWith(github.event.head_commit.message, 'Update version to ')"
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repo
        uses: actions/checkout@v6

      - name: Get previous version
        id: get_versions
        shell: bash
        run: |
          old_version="$(<version.txt)"
          current_date="$(date --utc +%Y%m%d)"
          echo "old_version=$old_version" >> $GITHUB_OUTPUT
          echo "current_date=$current_date" >> $GITHUB_OUTPUT

      - name: Compute new version
        id: compute_version
        shell: python
        run: |
          import os, re
          old_version = "${{steps.get_versions.outputs.old_version}}"
          current_date = "${{steps.get_versions.outputs.current_date}}"
          new_version = current_date
          if old_version.startswith(current_date):
              match = re.search(r"[a-z]+", old_version)
              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")
              new_version += "".join(reversed(charlist))
          with open(os.environ["GITHUB_OUTPUT"], "a") as envFile:
              print(f"new_version={new_version}", file=envFile)

      - name: Update version in files
        shell: bash
        env:
          VERSION_OLD: ${{steps.get_versions.outputs.old_version}}
          VERSION_NEW: ${{steps.compute_version.outputs.new_version}}
        run: |
          echo "Updating version from $VERSION_OLD to $VERSION_NEW"
          tag="sourceVersion"
          sed -i "s?<$tag>.*</$tag>?<$tag>$VERSION_NEW</$tag>?" tokens.xml
          echo "$VERSION_NEW" >version.txt

      - name: Commit and push changes
        shell: bash
        env:
          VERSION_NEW: ${{steps.compute_version.outputs.new_version}}
        run: |
          echo "::notice::Triggering commit: https://github.com/${GITHUB_REPOSITORY}/commit/$GITHUB_SHA"
          git config user.name github-actions
          git config user.email github-actions@github.com
          git add tokens.xml version.txt
          git commit -m "Update version to $VERSION_NEW" -m "Bump triggered by commit $GITHUB_SHA"
          git push
          commit_hash="$(git rev-parse HEAD)"
          echo "::notice::Pushed commit: https://github.com/${GITHUB_REPOSITORY}/commit/$commit_hash"