name: Release

on:
  push:
    branches:
      - main
    paths:
      - Cargo.toml
      - CHANGELOG.md
      - bench/Cargo.toml
      - .github/workflows/release.yml
  workflow_dispatch:

permissions:
  contents: write
  id-token: write

concurrency:
  group: release-main
  cancel-in-progress: false

jobs:
  release:
    runs-on: ubuntu-latest
    environment: release
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - uses: dtolnay/rust-toolchain@1.88.0

      - uses: Swatinem/rust-cache@v2.9.1

      - name: Read version and tag
        id: meta
        shell: bash
        run: |
          version="$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -n1)"
          if [[ -z "$version" ]]; then
            echo "Unable to parse version from Cargo.toml"
            exit 1
          fi
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "tag=v$version" >> "$GITHUB_OUTPUT"

      - name: Check whether tag already exists
        id: tag
        shell: bash
        run: |
          if git rev-parse -q --verify "refs/tags/${{ steps.meta.outputs.tag }}" >/dev/null; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
          elif git ls-remote --exit-code --tags origin "refs/tags/${{ steps.meta.outputs.tag }}" >/dev/null 2>&1; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Skip when already released
        if: steps.tag.outputs.exists == 'true'
        run: echo "Tag ${{ steps.meta.outputs.tag }} already exists. Nothing to release."

      - name: Verify package
        if: steps.tag.outputs.exists == 'false'
        run: |
          cargo package --locked
          cargo test --locked

      - name: Authenticate with crates.io
        if: steps.tag.outputs.exists == 'false'
        id: auth
        uses: rust-lang/crates-io-auth-action@v1

      - name: Publish to crates.io
        if: steps.tag.outputs.exists == 'false'
        env:
          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}
        run: cargo publish --locked

      - name: Create and push tag
        if: steps.tag.outputs.exists == 'false'
        shell: bash
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag -a "${{ steps.meta.outputs.tag }}" -m "${{ steps.meta.outputs.tag }}"
          git push origin "${{ steps.meta.outputs.tag }}"

      - name: Extract changelog entry
        if: steps.tag.outputs.exists == 'false'
        shell: bash
        run: |
          awk 'index($0, "## [${{ steps.meta.outputs.version }}]") == 1 {found=1; next} found && /^## \[/{exit} found{print}' CHANGELOG.md > release-notes.md
          if [[ ! -s release-notes.md ]]; then
            echo "No changelog entry found for ${{ steps.meta.outputs.version }}"
            exit 1
          fi

      - name: Create GitHub release
        if: steps.tag.outputs.exists == 'false'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          gh release create "${{ steps.meta.outputs.tag }}" \
            --repo "${{ github.repository }}" \
            --verify-tag \
            --notes-file release-notes.md