name: Release

# Fires when a v* tag is pushed — including tags created through Gitea's
# "New Release" UI. Builds the distributable plugin zip and attaches it to
# the release for that tag (creating the release if only a bare tag was
# pushed). The attached zip is what UpdateChecker serves to WordPress
# sites as the update package.

on:
  push:
    tags:
      - 'v*'

jobs:
  release:
    name: Build and Publish Release
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: '8.3'
          tools: composer:v2

      # A tag that disagrees with the plugin header would make sites see a
      # phantom update forever (or never see a real one), so fail fast.
      - name: Verify tag matches plugin version
        id: meta
        run: |
          tag_version="${GITHUB_REF_NAME#v}"
          header_version="$(sed -nE 's/^[[:space:]]*\*?[[:space:]]*Version:[[:space:]]*([^[:space:]]+).*/\1/p' unsupervised-schedular.php | head -1)"
          if [ "$tag_version" != "$header_version" ]; then
            echo "Tag ${GITHUB_REF_NAME} does not match plugin header Version: ${header_version}" >&2
            exit 1
          fi
          echo "version=${header_version}" >> "$GITHUB_OUTPUT"

      - name: Install dependencies
        run: composer install --prefer-dist --no-progress --no-interaction

      - name: Run tests
        run: composer test

      - name: Build plugin zip
        run: composer build

      # Pull the section for this version out of CHANGELOG.md so it can become
      # the release body. Matches "## [x.y.z]" and prints every line up to the
      # next "## " heading. A missing section is a warning, not a failure — the
      # release still publishes with empty notes.
      - name: Extract changelog notes
        run: |
          version="${{ steps.meta.outputs.version }}"
          awk -v ver="$version" '
            $0 ~ "^## \\[" ver "\\]" { found = 1; next }
            found && /^## / { exit }
            found { print }
          ' CHANGELOG.md | sed -e '/./,$!d' | tac | sed -e '/./,$!d' | tac > release-notes.md
          if [ ! -s release-notes.md ]; then
            echo "::warning::No CHANGELOG.md section found for version ${version}"
          fi

      - name: Publish release with zip asset
        env:
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
          version="${{ steps.meta.outputs.version }}"
          zip="dist/unsupervised-schedular-${version}.zip"

          # Pre-release versions (1.2.3-rc.1) are flagged so Gitea's
          # /releases/latest endpoint — and therefore the update checker —
          # skips them.
          prerelease=false
          case "$version" in *-*) prerelease=true ;; esac

          # Reuse the release if the tag was created via Gitea's release UI.
          release_id="$(curl -sS -H "Authorization: token ${TOKEN}" \
            "${api}/releases/tags/${GITHUB_REF_NAME}" | jq -r '.id // empty' || true)"

          if [ -z "$release_id" ]; then
            body="$(jq -Rs --arg tag "${GITHUB_REF_NAME}" --argjson pre "${prerelease}" \
              '{tag_name:$tag, name:$tag, prerelease:$pre, body:.}' release-notes.md)"
            release_id="$(curl -fsS -X POST "${api}/releases" \
              -H "Authorization: token ${TOKEN}" \
              -H 'Content-Type: application/json' \
              -d "${body}" | jq -r '.id')"
          else
            # Release pre-created via the UI: fill in the notes from the changelog.
            body="$(jq -Rs '{body:.}' release-notes.md)"
            curl -fsS -X PATCH "${api}/releases/${release_id}" \
              -H "Authorization: token ${TOKEN}" \
              -H 'Content-Type: application/json' \
              -d "${body}" > /dev/null
          fi

          echo "Attaching ${zip} to release ${release_id}"
          curl -fsS -X POST \
            "${api}/releases/${release_id}/assets?name=unsupervised-schedular-${version}.zip" \
            -H "Authorization: token ${TOKEN}" \
            -F "attachment=@${zip}" > /dev/null

  # After a stable release, move main forward: bump the plugin to the next patch
  # version and open a fresh changelog section for it, via a PR. Skipped for
  # pre-releases (tags containing a hyphen, e.g. v1.2.0-rc.1) — those don't
  # advance the mainline version.
  bump-version:
    name: Open next-version bump PR
    needs: release
    if: ${{ !contains(github.ref_name, '-') }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Compute next patch version
        id: next
        run: |
          current="$(sed -nE 's/^[[:space:]]*\*?[[:space:]]*Version:[[:space:]]*([^[:space:]]+).*/\1/p' unsupervised-schedular.php | head -1)"
          base="${current%%-*}"          # drop any pre-release suffix
          major="${base%%.*}"
          rest="${base#*.}"
          minor="${rest%%.*}"
          patch="${rest#*.}"
          next="${major}.${minor}.$((patch + 1))"
          echo "next=${next}" >> "$GITHUB_OUTPUT"

      - name: Apply version bump and open changelog section
        run: |
          next="${{ steps.next.outputs.next }}"
          # Plugin header + USC_VERSION constant must stay in lockstep.
          sed -i -E "s/^([[:space:]]*\*?[[:space:]]*Version:[[:space:]]*).*/\1${next}/" unsupervised-schedular.php
          sed -i -E "s/(define\('USC_VERSION', ')[^']+('\);)/\1${next}\2/" unsupervised-schedular.php
          # Insert an empty section for the new version above the current top one
          # (the first "## [" heading in the file).
          awk -v ver="$next" '
            !done && /^## \[/ { print "## [" ver "]"; print ""; done = 1 }
            { print }
          ' CHANGELOG.md > CHANGELOG.md.tmp && mv CHANGELOG.md.tmp CHANGELOG.md

      - name: Open pull request
        env:
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          next="${{ steps.next.outputs.next }}"
          branch="release/bump-${next}"
          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"

          git config user.name 'Release Bot'
          git config user.email 'release-bot@unsupervised.ca'
          git checkout -b "${branch}"
          git commit -am "Bump version to ${next} and open changelog section"
          git push origin "${branch}"

          curl -fsS -X POST "${api}/pulls" \
            -H "Authorization: token ${TOKEN}" \
            -H 'Content-Type: application/json' \
            -d "$(jq -n --arg head "${branch}" --arg title "Bump version to ${next}" \
              '{head:$head, base:"main", title:$title, body:"Automated post-release bump to the next patch version. Record changes for this version under its changelog heading."}')" \
            > /dev/null