name: Auto Release on Tag

on:
  push:
    tags:
      - 'v*.*.*'

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Extract version from tag
        id: ver
        run: echo "version=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT

      - name: Verify package.json version matches tag
        shell: bash
        run: |
          set -euo pipefail
          if [ ! -f package.json ]; then
            echo "::warning::package.json not found; skipping version-match check."
            exit 0
          fi
          PKG_VERSION="$(node -p "require('./package.json').version")"
          TAG_VERSION="${{ steps.ver.outputs.version }}"
          if [ "$PKG_VERSION" != "$TAG_VERSION" ]; then
            echo "::error::Tag v${TAG_VERSION} does not match package.json version ${PKG_VERSION}. Bump package.json before tagging (Iron Rule 5)."
            exit 1
          fi
          echo "Tag v${TAG_VERSION} matches package.json version ${PKG_VERSION}."

      - name: Enforce phase_rolling_mode (Unreleased must be promoted)
        shell: bash
        run: |
          set -euo pipefail
          if [ ! -f CHANGELOG.md ]; then
            echo "::warning::CHANGELOG.md not found; skipping phase_rolling_mode gate."
            exit 0
          fi
          # Per CLAUDE.md release_kit.phase_rolling_mode: a Phase-close PR must
          # promote "## Unreleased" → "## v<version>" before the tag is pushed.
          # This gate catches the failure mode where someone tags without
          # promoting — release.yml would otherwise extract a stale
          # "## v<version>" section and ignore D-day work folded into Unreleased.
          #
          # An "Unreleased" section is considered trivial (acceptable) when its
          # body is empty or contains only blank lines and parenthetical sentinels
          # like "(empty — Phase N entries land here once Phase N opens)". Any
          # other line (bullet, paragraph, sub-heading) is treated as unpromoted
          # content → the gate fires.
          UNRELEASED_BODY="$(awk '
            /^## Unreleased$/ { found=1; next }
            found && /^## / { exit }
            found { print }
          ' CHANGELOG.md)"
          if [ -z "$UNRELEASED_BODY" ]; then
            echo "No ## Unreleased section found — gate passes."
            exit 0
          fi
          # Strip blank lines and parenthetical-sentinel-only lines.
          NON_TRIVIAL="$(printf '%s\n' "$UNRELEASED_BODY" \
            | sed -E '/^[[:space:]]*$/d; /^[[:space:]]*\(.*\)[[:space:]]*$/d')"
          if [ -n "$NON_TRIVIAL" ]; then
            echo "::error::CHANGELOG.md ## Unreleased section is non-trivial but tag v${{ steps.ver.outputs.version }} was pushed. Per CLAUDE.md release_kit.phase_rolling_mode, promote Unreleased → ## v<version> before tagging. Offending content:"
            printf '%s\n' "$NON_TRIVIAL" | sed 's/^/    /'
            exit 1
          fi
          echo "## Unreleased section is empty or sentinel-only — gate passes."

      - name: Extract CHANGELOG section
        id: notes
        shell: bash
        run: |
          set -euo pipefail
          VERSION="${{ steps.ver.outputs.version }}"
          if [ ! -f CHANGELOG.md ]; then
            echo "No CHANGELOG.md found; using minimal release notes"
            echo "Release v${VERSION}" > /tmp/release-notes.md
            exit 0
          fi
          awk -v ver="v${VERSION}" '
            $0 ~ "^## " ver { found=1; print; next }
            found && /^## v/ { exit }
            found { print }
          ' CHANGELOG.md > /tmp/release-notes.md
          if [ ! -s /tmp/release-notes.md ]; then
            echo "No matching section in CHANGELOG for v${VERSION}; using minimal notes"
            echo "Release v${VERSION}" > /tmp/release-notes.md
          fi

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          VERSION="${{ steps.ver.outputs.version }}"
          if gh release view "v${VERSION}" >/dev/null 2>&1; then
            echo "Release v${VERSION} already exists - skipping"
            exit 0
          fi
          gh release create "v${VERSION}" \
            --title "v${VERSION}" \
            --notes-file /tmp/release-notes.md \
            --latest