name: Semver Checks

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  semver-checks:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Install Rust
        uses: actions-rust-lang/setup-rust-toolchain@2b1f5e9b395427c92ee4e3331786ca3c37afe2d7 # v1.16.0
        with:
          toolchain: stable

      - name: Install cargo-semver-checks
        uses: taiki-e/install-action@cf525cb33f51aca27cd6fa02034117ab963ff9f1 # v2.75.22
        with:
          tool: cargo-semver-checks

      - name: Run cargo semver-checks
        id: semver
        shell: bash
        run: |
          set -o pipefail

          output_file="$(mktemp)"

          cargo semver-checks \
            --workspace \
            --release-type=patch \
            --baseline-rev "${{ github.event.pull_request.base.sha }}" \
            2>&1 | tee "$output_file"
          status=$?

          semver_type=patch
          if grep -q "semver requires new major version" "$output_file"; then
            semver_type=major
          elif grep -q "semver requires new minor version" "$output_file"; then
            semver_type=minor
          elif grep -q "semver requires new patch version" "$output_file"; then
            semver_type=patch
          fi

          {
            echo "exit_code=$status"
            echo "output_file=$output_file"
            echo "semver_type=$semver_type"
          } >> "$GITHUB_OUTPUT"

          exit 0

      - name: Summarize cargo semver-checks output
        if: always() && steps.semver.outcome != 'skipped'
        shell: bash
        env:
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
          SEMVER_TYPE: ${{ steps.semver.outputs.semver_type }}
          STATUS: ${{ steps.semver.outputs.exit_code }}
          SUMMARY_FILE: ${{ steps.semver.outputs.output_file }}
        run: |
          summary_file="$SUMMARY_FILE"
          status="$STATUS"

          {
            echo "## cargo semver-checks"
            echo
            echo "- Base SHA: \`${BASE_SHA}\`"
            echo "- Head SHA: \`${HEAD_SHA}\`"
            echo "- Required release: \`${SEMVER_TYPE}\`"
            echo "- cargo semver-checks exit code: \`$status\`"

            echo
            echo "<details><summary>Command output</summary>"
            echo
            echo '```text'
            sed -n '1,200p' "$summary_file"
            total_lines="$(wc -l < "$summary_file")"
            if [ "$total_lines" -gt 200 ]; then
              echo
              echo "[truncated; showing first 200 of ${total_lines} lines]"
            fi
            echo '```'
            echo "</details>"
          } >> "$GITHUB_STEP_SUMMARY"