name: Release

on:
  push:
    tags: ["v*"]

jobs:
  release:
    runs-on: fedora
    steps:
      - uses: actions/checkout@v4

      - name: Verify tag and extract CHANGELOG section
        env:
          VERSION: ${{ gitea.ref_name }}
        run: |
          set -euo pipefail

          if ! echo "$VERSION" | grep -qE '^v[0-9]+(\.[0-9]+){0,2}([-+].*)?$'; then
            echo "ERROR: expected a semver tag like v1.2.3, got: '$VERSION'"
            exit 1
          fi

          VERSION_NO_V="${VERSION#v}"
          echo "Looking for CHANGELOG section: ${VERSION_NO_V}"

          sed -n "/^## \[${VERSION_NO_V}\] /,/^## \[/p" CHANGELOG.md \
            | sed '$d' \
            | tail -n +2 \
            > release-body.md

          if [ ! -s release-body.md ]; then
            echo "ERROR: no CHANGELOG section found for ${VERSION_NO_V}"
            echo "Expected a heading like: ## [${VERSION_NO_V}] — YYYY-MM-DD"
            exit 1
          fi

          echo "Release body preview:"
          head -n 20 release-body.md

      - name: Create release
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          set -euo pipefail

          # JSON-escape the release body with sed: backslashes first, then
          # quotes, tabs, and carriage returns, and finally fold newlines into
          # \n. Wrap the result in quotes to form a JSON string.
          BODY=$(sed -e 's/\\/\\\\/g' \
                     -e 's/"/\\"/g' \
                     -e 's/\t/\\t/g' \
                     -e 's/\r//g' \
                     release-body.md \
                 | sed ':a;N;$!ba;s/\n/\\n/g')
          BODY="\"${BODY}\""

          response=$(curl -sS -w '\n%{http_code}' \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -X POST \
            "${GITEA_SERVER_URL}/api/v1/repos/${GITEA_REPOSITORY}/releases" \
            -d "{
              \"tag_name\": \"${GITEA_REF_NAME}\",
              \"name\": \"${GITEA_REF_NAME}\",
              \"body\": ${BODY},
              \"draft\": false,
              \"prerelease\": false
            }")

          http_code=$(echo "$response" | tail -1)
          payload=$(echo "$response" | sed '$d')

          echo "HTTP ${http_code}"
          if [ "$http_code" != "201" ]; then
            echo "Failed to create release: ${payload}"
            exit 1
          fi

          RELEASE_ID=$(echo "$payload" | grep -oE '"id"[[:space:]]*:[[:space:]]*[0-9]+' | head -1 | grep -oE '[0-9]+')
          echo "Release ${GITEA_REF_NAME} is live (ID=${RELEASE_ID})."