name: vociferate/publish
description: >
  Extract release notes from the changelog and create or update a
  Gitea/GitHub release. The repository must be checked out at the release
  tag before this action runs.

inputs:
  token:
    description: >
      Token used to authenticate release API calls. Defaults to the
      workflow token.
    required: false
    default: ''
  version:
    description: >
      Semantic version to publish (with or without leading v). When omitted,
      derived from the current git tag ref.
    required: false
    default: ''
  changelog:
    description: Path to changelog file relative to repository root.
    required: false
    default: changelog.md

outputs:
  release-id:
    description: Numeric ID of the created or updated release.
    value: ${{ steps.create-release.outputs.id }}
  tag:
    description: The tag used for the release (e.g. v1.2.3).
    value: ${{ steps.resolve-version.outputs.tag }}
  version:
    description: The bare version string without leading v (e.g. 1.2.3).
    value: ${{ steps.resolve-version.outputs.version }}

runs:
  using: composite
  steps:
    - name: Resolve release version
      id: resolve-version
      shell: bash
      env:
        INPUT_VERSION: ${{ inputs.version }}
        GITHUB_REF_VALUE: ${{ github.ref }}
      run: |
        set -euo pipefail

        provided="$(printf '%s' "${INPUT_VERSION:-}" | sed 's/^[[:space:]]\+//; s/[[:space:]]\+$//')"
        if [[ -n "$provided" ]]; then
          normalized="${provided#v}"
          tag="v${normalized}"
        elif [[ "${GITHUB_REF_VALUE}" == refs/tags/* ]]; then
          tag="${GITHUB_REF_VALUE#refs/tags/}"
          normalized="${tag#v}"
        elif head_tag="$(git describe --exact-match --tags HEAD 2>/dev/null)" && [[ -n "$head_tag" ]]; then
          tag="$head_tag"
          normalized="${tag#v}"
        else
          echo "A version input is required when the workflow is not running from a tag push" >&2
          exit 1
        fi

        echo "tag=$tag"           >> "$GITHUB_OUTPUT"
        echo "version=$normalized" >> "$GITHUB_OUTPUT"

    - name: Extract release notes from changelog
      id: extract-notes
      shell: bash
      env:
        CHANGELOG: ${{ inputs.changelog != '' && inputs.changelog || 'changelog.md' }}
        RELEASE_VERSION: ${{ steps.resolve-version.outputs.version }}
        RUNNER_TEMP: ${{ runner.temp }}
      run: |
        set -euo pipefail

        release_notes="$(awk -v version="$RELEASE_VERSION" '
          $0 ~ "^## \\[" version "\\]" {capture=1}
          capture {
            if ($0 ~ "^## \\[" && $0 !~ "^## \\[" version "\\]") exit
            print
          }
        ' "$CHANGELOG")"

        if [[ -z "${release_notes//[[:space:]]/}" ]]; then
          echo "Release notes section for ${RELEASE_VERSION} was not found in ${CHANGELOG}" >&2
          exit 1
        fi

        notes_file="${RUNNER_TEMP}/release-notes.md"
        printf '%s\n' "$release_notes" > "$notes_file"
        echo "notes_file=$notes_file" >> "$GITHUB_OUTPUT"

    - name: Create or update release
      id: create-release
      shell: bash
      env:
        TOKEN: ${{ inputs.token != '' && inputs.token || github.token }}
        TAG_NAME: ${{ steps.resolve-version.outputs.tag }}
        RELEASE_NOTES_FILE: ${{ steps.extract-notes.outputs.notes_file }}
        GITHUB_API_URL: ${{ github.api_url }}
        GITHUB_SERVER_URL: ${{ github.server_url }}
        GITHUB_SHA: ${{ github.sha }}
        GITHUB_REPOSITORY: ${{ github.repository }}
      run: |
        set -euo pipefail

        release_notes="$(cat "$RELEASE_NOTES_FILE")"
        escaped_release_notes="$(printf '%s' "$release_notes" | sed 's/\\/\\\\/g; s/"/\\"/g; :a;N;$!ba;s/\n/\\n/g')"
        release_api="${GITHUB_API_URL:-${GITHUB_SERVER_URL%/}/api/v1}/repos/${GITHUB_REPOSITORY}/releases"
        release_by_tag_api="${release_api}/tags/${TAG_NAME}"

        status_code="$(curl -sS -o release-existing.json -w '%{http_code}' \
          -H "Authorization: token ${TOKEN}" \
          -H "Content-Type: application/json" \
          "${release_by_tag_api}")"

        if [[ "$status_code" == "200" ]]; then
          existing_release_id="$(sed -n 's/.*"id"[[:space:]]*:[[:space:]]*\([0-9][0-9]*\).*/\1/p' release-existing.json | head -n 1)"
          if [[ -z "$existing_release_id" ]]; then
            echo "Failed to parse existing release id for ${TAG_NAME}" >&2
            cat release-existing.json >&2
            exit 1
          fi

          curl --fail-with-body \
            -X PATCH \
            -H "Authorization: token ${TOKEN}" \
            -H "Content-Type: application/json" \
            "${release_api}/${existing_release_id}" \
            --data "{\"tag_name\":\"${TAG_NAME}\",\"target\":\"${GITHUB_SHA}\",\"name\":\"${TAG_NAME}\",\"body\":\"${escaped_release_notes}\",\"draft\":false,\"prerelease\":false}" \
            --output release.json

          echo "id=$existing_release_id" >> "$GITHUB_OUTPUT"
        elif [[ "$status_code" != "404" ]]; then
          echo "Unexpected response while checking release ${TAG_NAME}: HTTP ${status_code}" >&2
          cat release-existing.json >&2
          exit 1
        else
          curl --fail-with-body \
            -X POST \
            -H "Authorization: token ${TOKEN}" \
            -H "Content-Type: application/json" \
            "${release_api}" \
            --data "{\"tag_name\":\"${TAG_NAME}\",\"target\":\"${GITHUB_SHA}\",\"name\":\"${TAG_NAME}\",\"body\":\"${escaped_release_notes}\",\"draft\":false,\"prerelease\":false}" \
            --output release.json

          release_id="$(sed -n 's/.*"id"[[:space:]]*:[[:space:]]*\([0-9][0-9]*\).*/\1/p' release.json | head -n 1)"
          if [[ -z "$release_id" ]]; then
            echo "Failed to parse release id from API response" >&2
            cat release.json >&2
            exit 1
          fi

          echo "id=$release_id" >> "$GITHUB_OUTPUT"
        fi