---
# DESCRIPTION: Github actions config
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

name: Code coverage

on:
  workflow_dispatch:
  schedule:
    - cron: '0 0 * * 0'  # weekly
  pull_request:
    types: [opened, synchronize, reopened, labeled, unlabeled]

permissions:
  contents: read

defaults:
  run:
    shell: bash

concurrency:
  # At most 1 job per branch. Auto cancel all but scheduled jobs
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.event_name != 'schedule' }}

jobs:

  build:
    name: Build
    # Only run scheduled jobs if explicitly enabled for that repo (e.g.: not on forks)
    # Only run pull request jobs if labelled as needing an coverage run
    # Always run workflow dispatch jobs
    if: |
      (github.event_name == 'schedule'
        && vars.ENABLE_SCHEDULED_JOBS == 'true') ||
      (github.event_name == 'pull_request'
        && contains(github.event.pull_request.labels.*.name, 'pr: dev-coverage')) ||
      (github.event_name == 'workflow_dispatch')
    uses: ./.github/workflows/reusable-build.yml
    with:
      # For pull requests, build the head of the pull request branch, not the
      # merge commit, otherwise patch coverage would include the changes
      # between the root of the pull request and the target branch
      sha: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
      os: ubuntu-24.04
      os-name: linux
      cc: gcc
      dev-asan: 0
      dev-gcov: 1

  test:
    name: Test | ${{ matrix.test }}${{ matrix.num }}
    needs: build
    uses: ./.github/workflows/reusable-test.yml
    with:
      archive: ${{ needs.build.outputs.archive }}
      os: ubuntu-24.04
      cc: gcc
      reloc: 0
      suite: ${{ matrix.test }}${{ matrix.num }}
      dev-gcov: 1
    strategy:
      fail-fast: false
      matrix:
        test: [coverage-vlt-, coverage-vltmt-]
        num: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
        include:
          - {test: coverage-dist, num: ''}

  publish-codecov:
    name: Publish results to codecov.io
    needs: test
    if: ${{ contains(needs.*.result, 'success') && !cancelled() }}
    runs-on: ubuntu-24.04
    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Download code coverage data
        uses: actions/download-artifact@v6
        with:
          pattern: code-coverage-*
          path: obj_coverage
          merge-multiple: true

      - name: List files
        id: list-files
        run: |
          ls -lsha obj_coverage
          find obj_coverage -type f | paste -sd, | sed "s/^/files=/" >> "$GITHUB_OUTPUT"

      - name: Upload to codecov.io
        uses: codecov/codecov-action@v5
        with:
          disable_file_fixes: true
          disable_search: true
          fail_ci_if_error: true
          files: ${{ steps.list-files.outputs.files }}
          plugins: noop
          token: ${{ secrets.CODECOV_TOKEN }}
          verbose: true

  prepare-report:
    name: Prepare HTML report
    needs: [build, test]
    if: ${{ contains(needs.*.result, 'success') && !cancelled() }}
    runs-on: ubuntu-24.04
    steps:
      - name: Install dependencies
        run: |
          echo 'set man-db/auto-update false' | sudo debconf-communicate >/dev/null
          sudo dpkg-reconfigure man-db
          sudo apt install lcov

      - name: Download repository archive
        uses: actions/download-artifact@v6
        with:
          name: ${{ needs.build.outputs.archive }}
          path: ${{ github.workspace }}

      - name: Unpack repository archive
        run: |
          tar -x -z -f ${{ needs.build.outputs.archive }}
          ls -lsha

      - name: Download code coverage data
        uses: actions/download-artifact@v6
        with:
          pattern: code-coverage-*
          path: repo/obj_coverage
          merge-multiple: true

      - name: Create report
        working-directory: repo
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          ls -lsha obj_coverage
          # Combine reports from test jobs
          nodist/fastcov.py -C obj_coverage/verilator-*.info --lcov -o obj_coverage/verilator.info
          # For a PR, report patch coverage against the merge-base between the head of the PR and the target branch
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            COVERAGE_BASE=$(git rev-parse --short $(git merge-base ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }}))
            make coverage-report COVERAGE_BASE=${COVERAGE_BASE} |& tee ${{ github.workspace }}/make-coverage-report.log
          else
            make coverage-report
          fi
          # Remove data files
          rm -f obj_coverage/verilator*.info
          # Some extra work for PRs only
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            # Save PR number in report
            echo ${{ github.event.number }} > obj_coverage/pr-number.txt
            # Generate notification comment content
            mkdir -p notification
            echo ${{ github.event.number }} > notification/pr-number.txt
            NUM=$(gh run view ${{ github.run_id }} --json number --jq ".number")
            URL=$(gh run view ${{ github.run_id }} --json url    --jq ".url")
            echo "Patch coverage from PR workflow [#$NUM]($URL) (code coverage of lines changed relative to ${COVERAGE_BASE}):" > notification/body.txt
            if [[ ! -f obj_coverage/empty-patch ]]; then
              echo "<pre>" >> notification/body.txt
              grep -E "(lines|branches)\.*:" ${{ github.workspace }}/make-coverage-report.log | sed "s/\.*:/:/" >> notification/body.txt || true
              echo "</pre>" >> notification/body.txt
              echo "Report: [${{ github.run_id }}](https://${{ github.repository_owner }}.github.io/verilator/coverage-reports/${{ github.run_id }}/index.html)" >> notification/body.txt
            else
              echo "Patch contains no code changes" >> notification/body.txt
            fi
            cat notification/body.txt
          fi

      - name: Upload report
        uses: actions/upload-artifact@v5
        with:
          path: repo/obj_coverage
          name: coverage-report

      - name: Upload notification
        if: ${{ github.event_name == 'pull_request' }}
        uses: actions/upload-artifact@v5
        with:
          path: repo/notification
          name: coverage-pr-notification

  # Create GitHub issue for failed scheduled jobs
  # This should always be the last job (we want an issue if anything breaks)
  create-issue:
    name: Create issue on failure
    needs: [publish-codecov,prepare-report]
    if: ${{ github.event_name == 'schedule' && github.repository == 'verilator/verilator' && github.run_attempt == 1 && failure() && !cancelled() }}
    runs-on: ubuntu-24.04
    steps:
      # Creating issues requires elevated privilege
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@v2.1.4
        with:
          app-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          owner: verilator
          repositories: verilator
          permission-issues: write
      - name: Create issue
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          echo "This issue was created automatically by the GitHub Actions CI due to the failure of a scheduled Code coverage run." >> body.txt
          echo "" >> body.txt
          echo "Workflow status: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" >> body.txt
          gh issue --repo ${{ github.repository }} create \
            --title "Code coverage run #${{ github.run_number }} Failed" \
            --body-file body.txt \
            --label new \
            --assignee gezalore,wsnyder