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

# Drives the automation of a pull request.

name: Maintenance - PR automation

on:
  pull_request_target:  # 'pull_request' can have no write permissions
    types: [opened, synchronize, reopened, closed]
  workflow_run:  # To react to the result of a workflow on a pull request
    workflows: ["Code coverage", "RTLMeter", "Regression"]
    types: [completed]
  push:  # A pull request can start conflicting when its base branch moves
    branches: [master]
permissions:
  contents: read  # To check out the local action, everything else uses the CI app token

defaults:
  run:
    shell: bash

# One job per event source, to avoid startup churn. Use separate gated steps for actions
jobs:
  pr-event:
    name: PR event
    if: |
      github.repository == 'verilator/verilator'
      && github.event_name == 'pull_request_target'
    runs-on: ubuntu-slim
    steps:
      # Label as the CI app, and not with 'github.token', as events from the
      # latter do not create workflow runs, so the labels would drive nothing
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1  # v3.2.0
        with:
          client-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          permission-pull-requests: write

      - name: "Add 'pr: regression' label on open"
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        if: ${{ github.event.action == 'opened' || github.event.action == 'reopened' }}
        run: |-
          gh pr edit "${{ github.event.number }}" \
            --repo "${{ github.repository }}" \
            --add-label 'pr: regression'

      - name: "Optionally add 'pr: dev-coverage' label on open"
        if: ${{ github.event.action == 'opened' || github.event.action == 'reopened' }}
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # Grab changed files
          FILES=$(gh api --paginate \
            "repos/${{ github.repository }}/pulls/${{ github.event.number }}/files" \
            --jq '.[].filename')
          echo "Files changed:"
          echo "${FILES}"
          # Add label if src or include chagned
          if grep -q -E '^(src|include)/' <<< "${FILES}"; then
            gh pr edit "${{ github.event.number }}" \
              --repo "${{ github.repository }}" \
              --add-label 'pr: dev-coverage'
          fi

      - name: "Remove all 'pr*' labels on close"
        if: ${{ github.event.action == 'closed' }}
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # Filter in 'jq', so an empty result is not an error, as it is with 'grep'
          LABELS=$(gh api \
            "repos/${{ github.repository }}/issues/${{ github.event.number }}/labels?per_page=100" \
            --jq '[.[].name | select(startswith("pr"))] | join(",")')
          if [ -n "${LABELS}" ]; then
            echo "Removing labels: ${LABELS}"
            gh pr edit "${{ github.event.number }}" \
              --repo "${{ github.repository }}" \
              --remove-label "${LABELS}"
          fi

  conflicting:
    name: Conflict check
    # A pull request can start conflicting when its own head moves, or when the
    # base branch moves under it, so sweep the open pull requests on both.
    if: |
      github.repository == 'verilator/verilator'
      && (github.event_name == 'push'
          || (github.event_name == 'pull_request_target'
              && github.event.action == 'synchronize'))
    runs-on: ubuntu-slim
    steps:
      # Label as the CI app, and not with 'github.token', as events from the
      # latter do not create workflow runs, so the labels would drive nothing
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1  # v3.2.0
        with:
          client-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          permission-pull-requests: write

      - name: "Update the 'pr-blocked: needs-rebase' label"
        uses: eps1lon/actions-label-merge-conflict@0273be72a0bbd58fcd71d0d6c02c209b50d1e5e1  # 3.1.0
        with:
          dirtyLabel: "pr-blocked: needs-rebase"
          repoToken: ${{ steps.generate-token.outputs.token }}

  regression-complete:
    name: Regression complete
    if: |
      github.repository == 'verilator/verilator'
      && github.event_name == 'workflow_run'
      && github.event.workflow_run.name == 'Regression'
      && github.event.workflow_run.event == 'pull_request'
      && (github.event.workflow_run.conclusion == 'success'
          || github.event.workflow_run.conclusion == 'failure')
    runs-on: ubuntu-slim
    steps:
      # Label as the CI app, and not with 'github.token', as events from the
      # latter do not create workflow runs, so the labels would drive nothing
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1  # v3.2.0
        with:
          client-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          permission-actions: read
          permission-pull-requests: write

      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7
        with:
          sparse-checkout: .github/actions/update-pr-label

      - name: Get the pull request number
        id: pr
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # The run tells us which pull request it was for
          if ! gh run download "${{ github.event.workflow_run.id }}" --name pr-number; then
            echo "Run has no 'pr-number' artifact"
            exit 0
          fi
          echo "number=$(cat pr-number.txt)" >> "$GITHUB_OUTPUT"

      - name: "Update the 'pr-blocked: fix-regression' label"
        if: ${{ steps.pr.outputs.number }}
        uses: ./.github/actions/update-pr-label
        with:
          token: ${{ steps.generate-token.outputs.token }}
          pr-number: ${{ steps.pr.outputs.number }}
          head-sha: ${{ github.event.workflow_run.head_sha }}
          label: "pr-blocked: fix-regression"
          set: ${{ github.event.workflow_run.conclusion == 'failure' }}

  rtlmeter-complete:
    name: RTLMeter complete
    if: |
      github.repository == 'verilator/verilator'
      && github.event_name == 'workflow_run'
      && github.event.workflow_run.name == 'RTLMeter'
      && github.event.workflow_run.event == 'pull_request'
      && (github.event.workflow_run.conclusion == 'success'
          || github.event.workflow_run.conclusion == 'failure')
    runs-on: ubuntu-slim
    steps:
      # Label as the CI app, and not with 'github.token', as events from the
      # latter do not create workflow runs, so the labels would drive nothing
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1  # v3.2.0
        with:
          client-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          permission-actions: read
          permission-pull-requests: write

      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7
        with:
          sparse-checkout: .github/actions/update-pr-label

      - name: Get the pull request number
        id: pr
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # The run tells us which pull request it was for
          if ! gh run download "${{ github.event.workflow_run.id }}" --name pr-number; then
            echo "Run has no 'pr-number' artifact"
            exit 0
          fi
          echo "number=$(cat pr-number.txt)" >> "$GITHUB_OUTPUT"

      - name: "Update the 'pr-blocked: fix-rtlmeter' label"
        if: ${{ steps.pr.outputs.number }}
        uses: ./.github/actions/update-pr-label
        with:
          token: ${{ steps.generate-token.outputs.token }}
          pr-number: ${{ steps.pr.outputs.number }}
          head-sha: ${{ github.event.workflow_run.head_sha }}
          label: "pr-blocked: fix-rtlmeter"
          set: ${{ github.event.workflow_run.conclusion == 'failure' }}

  coverage-complete:
    name: Coverage complete
    if: |
      github.repository == 'verilator/verilator'
      && github.event_name == 'workflow_run'
      && github.event.workflow_run.name == 'Code coverage'
      && github.event.workflow_run.event == 'pull_request'
      && (github.event.workflow_run.conclusion == 'success'
          || github.event.workflow_run.conclusion == 'failure')
    runs-on: ubuntu-slim
    steps:
      # Label as the CI app, and not with 'github.token', as events from the
      # latter do not create workflow runs, so the labels would drive nothing
      - name: Generate access token
        id: generate-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1  # v3.2.0
        with:
          client-id: ${{ vars.VERILATOR_CI_ID }}
          private-key: ${{ secrets.VERILATOR_CI_KEY }}
          permission-actions: read
          permission-pull-requests: write

      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7
        with:
          sparse-checkout: .github/actions/update-pr-label

      - name: Get the pull request number
        id: pr
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # The run tells us which pull request it was for
          if ! gh run download "${{ github.event.workflow_run.id }}" --name pr-number; then
            echo "Run has no 'pr-number' artifact"
            exit 0
          fi
          echo "number=$(cat pr-number.txt)" >> "$GITHUB_OUTPUT"

      - name: "Update the 'pr-blocked: fix-dev-coverage' label"
        if: ${{ steps.pr.outputs.number }}
        uses: ./.github/actions/update-pr-label
        with:
          token: ${{ steps.generate-token.outputs.token }}
          pr-number: ${{ steps.pr.outputs.number }}
          head-sha: ${{ github.event.workflow_run.head_sha }}
          label: "pr-blocked: fix-dev-coverage"
          set: ${{ github.event.workflow_run.conclusion == 'failure' }}

      - name: Get the line coverage
        id: coverage
        if: ${{ github.event.workflow_run.conclusion == 'success' }}
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.token }}
        run: |-
          # Whether every line the patch touches is covered
          if ! gh run download "${{ github.event.workflow_run.id }}" --name coverage-status; then
            echo "Run has no 'coverage-status' artifact"
            exit 0
          fi
          echo "covered=$(cat coverage-status.txt)" >> "$GITHUB_OUTPUT"

      - name: "Update the 'pr-blocked: improve-coverage' label"
        if: ${{ steps.pr.outputs.number && steps.coverage.outputs.covered }}
        uses: ./.github/actions/update-pr-label
        with:
          token: ${{ steps.generate-token.outputs.token }}
          pr-number: ${{ steps.pr.outputs.number }}
          head-sha: ${{ github.event.workflow_run.head_sha }}
          label: "pr-blocked: improve-coverage"
          set: ${{ steps.coverage.outputs.covered != 'true' }}