# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

# Releases are driven by manually pushed tags only. Nothing is published
# automatically when a pull request is merged.
#
#   v<X>.<Y>.<Z>-rc<N>  GitHub pre-release only.
#   v<X>.<Y>.<Z>        GitHub release plus the Go module proxy.

name: Release

on:
  push:
    tags:
      - "v*"

permissions:
  contents: write

jobs:
  release:
    if: ${{ github.repository == 'apache/casbin' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Compute release metadata
        id: release
        run: |
          set -euo pipefail

          TAG_NAME="${GITHUB_REF_NAME}"
          if [[ "${TAG_NAME}" =~ ^v([0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
            IS_RC="false"
          elif [[ "${TAG_NAME}" =~ ^v([0-9]+\.[0-9]+\.[0-9]+)-rc[0-9]+$ ]]; then
            IS_RC="true"
          else
            echo "::error::Unsupported release tag: ${TAG_NAME}. Expected vX.Y.Z or vX.Y.Z-rcN."
            exit 1
          fi

          VERSION="${BASH_REMATCH[1]}"
          BASENAME="apache-casbin-incubating-${VERSION}-src"

          # Previous release, used as the start of the change log range.
          PREVIOUS_TAG="$(
            {
              git tag --list 'v*' | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' || true
              echo "v${VERSION}"
            } |
              sort -V -u |
              awk -v current="v${VERSION}" '
                $0 == current {
                  print previous
                  exit
                }
                {
                  previous = $0
                }
              '
          )"

          {
            echo "tag=${TAG_NAME}"
            echo "version=${VERSION}"
            echo "is_rc=${IS_RC}"
            echo "basename=${BASENAME}"
            echo "previous_tag=${PREVIOUS_TAG}"
          } >> "${GITHUB_OUTPUT}"

      - name: Generate release notes
        run: |
          set -euo pipefail

          CURRENT_TAG="${{ steps.release.outputs.tag }}"
          CURRENT_VERSION="${CURRENT_TAG#v}"
          PREVIOUS_TAG="${{ steps.release.outputs.previous_tag }}"
          RELEASE_DATE="$(date -u +%F)"
          RANGE="${CURRENT_TAG}"

          if [ -n "${PREVIOUS_TAG}" ]; then
            RANGE="${PREVIOUS_TAG}..${CURRENT_TAG}"
          fi

          FEATURES="$(git log --pretty=format:'%s (%h)' "${RANGE}" | grep -Ei '^(feat)(\(.+\))?: ' || true)"
          FIXES="$(git log --pretty=format:'%s (%h)' "${RANGE}" | grep -Ei '^(fix)(\(.+\))?: ' || true)"
          DOCS="$(git log --pretty=format:'%s (%h)' "${RANGE}" | grep -Ei '^(docs?|doc)(\(.+\))?: ' || true)"

          {
            if [ -n "${PREVIOUS_TAG}" ]; then
              echo "# [${CURRENT_VERSION}](https://github.com/${GITHUB_REPOSITORY}/compare/${PREVIOUS_TAG}...${CURRENT_TAG}) (${RELEASE_DATE})"
            else
              echo "# ${CURRENT_VERSION} (${RELEASE_DATE})"
            fi
            echo
            if [ "${{ steps.release.outputs.is_rc }}" = "true" ]; then
              echo "Release candidate for ${{ steps.release.outputs.version }}. This is not an official release."
              echo
            fi

            if [ -n "${FEATURES}" ]; then
              echo "## Features"
              echo
              printf '%s\n' "${FEATURES}" | sed 's/^/- /'
              echo
            fi

            if [ -n "${FIXES}" ]; then
              echo "## Fixes"
              echo
              printf '%s\n' "${FIXES}" | sed 's/^/- /'
              echo
            fi

            if [ -n "${DOCS}" ]; then
              echo "## Docs"
              echo
              printf '%s\n' "${DOCS}" | sed 's/^/- /'
              echo
            fi

            if [ -z "${FEATURES}${FIXES}${DOCS}" ]; then
              echo "## Notes"
              echo
              echo "- No feat/fix/doc commits were found in this release range."
            fi
          } > RELEASE_NOTES.md

      - name: Create source archives
        run: |
          set -euo pipefail

          BASENAME="${{ steps.release.outputs.basename }}"
          mkdir -p dist
          git archive --format=tar.gz --prefix="${BASENAME}/" -o "dist/${BASENAME}.tar.gz" "${{ steps.release.outputs.tag }}"
          git archive --format=zip --prefix="${BASENAME}/" -o "dist/${BASENAME}.zip" "${{ steps.release.outputs.tag }}"

          cd dist
          for archive in "${BASENAME}.tar.gz" "${BASENAME}.zip"; do
            sha512sum "${archive}" > "${archive}.sha512"
          done
          sha512sum --check ./*.sha512

      - name: Publish GitHub release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail

          if [ "${{ steps.release.outputs.is_rc }}" = "true" ]; then
            TITLE="Apache Casbin (Incubating) ${{ steps.release.outputs.version }} (release candidate ${{ steps.release.outputs.tag }})"
            FLAGS=(--prerelease)
          else
            TITLE="Apache Casbin (Incubating) ${{ steps.release.outputs.version }}"
            FLAGS=(--latest)
          fi

          gh release create "${{ steps.release.outputs.tag }}" \
            --verify-tag \
            --title "${TITLE}" \
            --notes-file RELEASE_NOTES.md \
            "${FLAGS[@]}" \
            dist/*

      - name: Publish to the Go module proxy
        if: ${{ steps.release.outputs.is_rc == 'false' }}
        run: |
          set -euo pipefail

          MODULE_PATH="$(awk '/^module /{print $2; exit}' go.mod)"
          TAG="${{ steps.release.outputs.tag }}"

          # Requesting the version makes the proxy fetch and cache it, which is
          # what publishes the release to the Go module ecosystem.
          for attempt in 1 2 3; do
            if curl --fail --silent --show-error --location \
              "https://proxy.golang.org/${MODULE_PATH}/@v/${TAG}.info"; then
              echo
              echo "Published ${MODULE_PATH}@${TAG} to proxy.golang.org."
              exit 0
            fi
            echo "Attempt ${attempt} failed, retrying in 30s..."
            sleep 30
          done

          echo "::error::Failed to publish ${MODULE_PATH}@${TAG} to proxy.golang.org."
          exit 1