name: Pre-merge checks

on:
  pull_request:
    paths:
      - .github/workflows/_check-codestyle-python.yml
      - .github/workflows/_check-codestyle-rust.yml
      - .github/workflows/build-build-tools-image.yml
      - .github/workflows/pre-merge-checks.yml
  merge_group:

defaults:
  run:
    shell: bash -euxo pipefail {0}

# No permission for GITHUB_TOKEN by default; the **minimal required** set of permissions should be granted in each job.
permissions: {}

jobs:
  meta:
    runs-on: ubuntu-22.04
    permissions:
      contents: read
    outputs:
      python-changed: ${{ steps.python-src.outputs.any_changed }}
      rust-changed: ${{ steps.rust-src.outputs.any_changed }}
      branch: ${{ steps.group-metadata.outputs.branch }}
      pr-number: ${{ steps.group-metadata.outputs.pr-number }}
    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
        with:
          egress-policy: audit

      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
        id: python-src
        with:
          files: |
            .github/workflows/_check-codestyle-python.yml
            .github/workflows/build-build-tools-image.yml
            .github/workflows/pre-merge-checks.yml
            **/**.py
            poetry.lock
            pyproject.toml

      - uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
        id: rust-src
        with:
          files: |
            .github/workflows/_check-codestyle-rust.yml
            .github/workflows/build-build-tools-image.yml
            .github/workflows/pre-merge-checks.yml
            **/**.rs
            **/Cargo.toml
            Cargo.toml
            Cargo.lock

      - name: PRINT ALL CHANGED FILES FOR DEBUG PURPOSES
        env:
          PYTHON_CHANGED_FILES: ${{ steps.python-src.outputs.all_changed_files }}
          RUST_CHANGED_FILES: ${{ steps.rust-src.outputs.all_changed_files }}
        run: |
          echo "${PYTHON_CHANGED_FILES}"
          echo "${RUST_CHANGED_FILES}"

      - name: Merge group metadata
        if: ${{ github.event_name == 'merge_group' }}
        id: group-metadata
        env:
          MERGE_QUEUE_REF: ${{ github.event.merge_group.head_ref }}
        run: |
          echo $MERGE_QUEUE_REF | jq -Rr 'capture("refs/heads/gh-readonly-queue/(?<branch>.*)/pr-(?<pr_number>[0-9]+)-[0-9a-f]{40}") | ["branch=" + .branch, "pr-number=" + .pr_number] | .[]' | tee -a "${GITHUB_OUTPUT}"

  build-build-tools-image:
    if: |
      false
      || needs.meta.outputs.python-changed == 'true'
      || needs.meta.outputs.rust-changed == 'true'
    needs: [ meta ]
    permissions:
      contents: read
      packages: write
    uses: ./.github/workflows/build-build-tools-image.yml
    with:
      # Build only one combination to save time
      archs: '["x64"]'
      debians: '["bookworm"]'
    secrets: inherit

  check-codestyle-python:
    if: needs.meta.outputs.python-changed == 'true'
    needs: [ meta, build-build-tools-image ]
    permissions:
      contents: read
      packages: read
    uses: ./.github/workflows/_check-codestyle-python.yml
    with:
      # `-bookworm-x64` suffix should match the combination in `build-build-tools-image`
      build-tools-image: ${{ needs.build-build-tools-image.outputs.image }}-bookworm-x64
    secrets: inherit

  check-codestyle-rust:
    if: needs.meta.outputs.rust-changed == 'true'
    needs: [ meta, build-build-tools-image ]
    permissions:
      contents: read
      packages: read
    uses: ./.github/workflows/_check-codestyle-rust.yml
    with:
      # `-bookworm-x64` suffix should match the combination in `build-build-tools-image`
      build-tools-image: ${{ needs.build-build-tools-image.outputs.image }}-bookworm-x64
      archs: '["x64"]'
    secrets: inherit

  # To get items from the merge queue merged into main we need to satisfy "Status checks that are required".
  # Currently we require 2 jobs (checks with exact name):
  # - conclusion
  # - neon-cloud-e2e
  conclusion:
    # Do not run job on Pull Requests as it interferes with the `conclusion` job from the `build_and_test` workflow
    if: always() && github.event_name == 'merge_group'
    permissions:
      statuses: write # for `github.repos.createCommitStatus(...)`
      contents: write
    needs:
      - meta
      - check-codestyle-python
      - check-codestyle-rust
    runs-on: ubuntu-22.04
    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
        with:
          egress-policy: audit

      - name: Create fake `neon-cloud-e2e` check
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          # Retry script for 5XX server errors: https://github.com/actions/github-script#retries
          retries: 5
          script: |
            const { repo, owner } = context.repo;
            const targetUrl = `${context.serverUrl}/${owner}/${repo}/actions/runs/${context.runId}`;

            await github.rest.repos.createCommitStatus({
              owner: owner,
              repo: repo,
              sha: context.sha,
              context: `neon-cloud-e2e`,
              state: `success`,
              target_url: targetUrl,
              description: `fake check for merge queue`,
            });

      - name: Fail the job if any of the dependencies do not succeed or skipped
        run: exit 1
        if: |
          false
          || (github.event_name == 'merge_group' && needs.meta.outputs.branch != 'main')
          || (needs.check-codestyle-python.result == 'skipped' && needs.meta.outputs.python-changed == 'true')
          || (needs.check-codestyle-rust.result   == 'skipped' && needs.meta.outputs.rust-changed   == 'true')
          || contains(needs.*.result, 'failure')
          || contains(needs.*.result, 'cancelled')

      - name: Add fast-forward label to PR to trigger fast-forward merge
        if: >-
          ${{
            always()
            && github.event_name == 'merge_group'
            && contains(fromJSON('["release", "release-proxy", "release-compute"]'), needs.meta.outputs.branch)
          }}
        env:
          GH_TOKEN: ${{ secrets.CI_ACCESS_TOKEN }}
        run: >-
          gh pr edit ${{ needs.meta.outputs.pr-number }} --repo "${GITHUB_REPOSITORY}" --add-label "fast-forward"