# Cut a GitHub Release whenever the shipped version changes.
#
# The dashboard links users to the releases page, and that page held a single
# entry from five months earlier while the product shipped daily — which tells a
# visitor the project is abandoned. Commit messages here already read as release
# notes, so the note is the commit body rather than a generated list of subjects.
name: Release

on:
  push:
    branches: [main]
    paths:
      - 'frontend/package.json'

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 2

      - name: Read version, and stop if it did not change
        id: v
        run: |
          VERSION=$(node -p "require('./frontend/package.json').version")
          PREV=$(git show HEAD~1:frontend/package.json 2>/dev/null | node -p "JSON.parse(require('fs').readFileSync(0,'utf8')).version" || echo "")
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          if [ "$VERSION" = "$PREV" ]; then
            echo "unchanged=true" >> "$GITHUB_OUTPUT"
            echo "Version unchanged ($VERSION) — nothing to release."
          fi

      - name: Compose notes from the commit that shipped it
        if: steps.v.outputs.unchanged != 'true'
        env:
          VERSION: ${{ steps.v.outputs.version }}
        run: |
          # Written to a file rather than passed through a step output. Commit
          # messages here routinely contain backticks, and interpolating one into
          # a shell command lets the shell evaluate it — which is both why the
          # first attempt failed and a way to run arbitrary code in CI from a
          # commit message.
          {
            git log -1 --pretty=%B
            printf '\n---\n'
            printf 'Container image: `ghcr.io/2gt-media-group-llc/mikrotik-manager:%s`\n\n' "$VERSION"
            printf 'Documentation: https://2gt-media-group-llc.github.io/mikrotik-manager/\n'
          } > /tmp/release-notes.md

      - name: Publish
        if: steps.v.outputs.unchanged != 'true'
        env:
          GH_TOKEN: ${{ github.token }}
          VERSION: ${{ steps.v.outputs.version }}
        run: |
          TAG="v$VERSION"
          # Betas are marked pre-release so nobody is pointed at one by accident.
          PRERELEASE=""
          case "$TAG" in *beta*|*alpha*|*rc*) PRERELEASE="--prerelease" ;; esac
          gh release create "$TAG" \
            --title "$TAG" \
            --notes-file /tmp/release-notes.md \
            $PRERELEASE