name: Auto release

on:
  push:
    branches: [ "master" ]
    paths:
    - Makefile

env:
  GIT_EMAIL: noreply@cryptic.systems
  GIT_USER: CSRBot

jobs:
  tag_on_change:
    permissions:
      contents: write
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5.0.0
        with:
          fetch-depth: 0

      - name: Check if DC_VERSION line changed
        id: check_change
        run: |
          echo "changed=false" >> $GITHUB_OUTPUT

          for file in Makefile; do
            if git diff HEAD~1 HEAD -- "${file}" | grep --quiet '^[+-]DC_VERSION'; then
              echo "DC_VERSION line changed."
              echo "changed=true" >> $GITHUB_OUTPUT
              break
            fi
          done

      - name: Stop if no change detected
        if: steps.check_change.outputs.changed == 'false'
        run: echo "No DC_VERSION change. Exiting..."

      - name: Get latest tag
        if: steps.check_change.outputs.changed == 'true'
        id: get_tag
        run: |
          latest_tag=$(git tag --sort=-v:refname | grep --extended-regexp '^v[0-9]+\.[0-9]+\.[0-9]+$' | head --lines 1 || echo "0.0.0")
          echo "latest_tag=$latest_tag" >> $GITHUB_OUTPUT
          echo "Latest tag: $latest_tag"


      - name: Increment patch version
        if: steps.check_change.outputs.changed == 'true'
        id: bump
        run: |
          latest_tag=${{ steps.get_tag.outputs.latest_tag }}
          IFS='.' read -r major minor patch <<< "$latest_tag"
          patch=$((patch + 1))
          new_tag="${major}.${minor}.${patch}"
          echo "new_tag=$new_tag" >> $GITHUB_OUTPUT
          echo "New tag: $new_tag"

      - name: Create and push new tag
        if: steps.check_change.outputs.changed == 'true'
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          new_tag=${{ steps.bump.outputs.new_tag }}
          git config --local user.name "${GIT_USER}"
          git config --local user.email "${GIT_EMAIL}"
          git tag -a "${new_tag}" -m "${new_tag}"
          git push origin "${new_tag}"

      - name: Trigger "Push tagged images" workflow
        if: steps.check_change.outputs.changed == 'true'
        uses: peter-evans/repository-dispatch@v4.0.0
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          event-type: push-tagged-images
          client-payload: |
            {
              "tag": "${{ steps.bump.outputs.new_tag }}"
            }