# The golangci-lint version lives in hack/golangci-lint.version, which Dependabot
# cannot parse. This bumps it and opens a PR.
#
# Events caused by GITHUB_TOKEN start no workflows. AUTOMATION_SSH_KEY is an optional
# repository secret holding the private half of a deploy key with write access; the
# branch is pushed over SSH with it, so pushes to an open PR run ci.yaml. Opening the PR
# is still a GITHUB_TOKEN event, so a new PR gets its checks from a dispatched run on
# its branch, as workflow_dispatch is the exception to that rule.
name: upstream-sync

on:
  schedule:
    - cron: "17 4 * * *"
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write
  actions: write

jobs:
  golangci-lint:
    runs-on: ubuntu-latest
    concurrency:
      group: upstream-sync-golangci-lint
      cancel-in-progress: true
    steps:
      - uses: actions/checkout@v7
        with:
          ssh-key: ${{ secrets.AUTOMATION_SSH_KEY }}

      - id: detect
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          current=$(cat hack/golangci-lint.version)
          latest=$(gh release view --repo golangci/golangci-lint --json tagName -q .tagName)
          echo "current=${current}" >> "$GITHUB_OUTPUT"
          echo "latest=${latest}" >> "$GITHUB_OUTPUT"
          [ "${current}" = "${latest}" ] && echo "changed=false" >> "$GITHUB_OUTPUT" || echo "changed=true" >> "$GITHUB_OUTPUT"

      - if: steps.detect.outputs.changed == 'true'
        run: echo "${{ steps.detect.outputs.latest }}" > hack/golangci-lint.version

      # A new release usually means new checks, so let the PR say whether we pass.
      - if: steps.detect.outputs.changed == 'true'
        id: lint
        continue-on-error: true
        uses: golangci/golangci-lint-action@v9
        with:
          version: ${{ steps.detect.outputs.latest }}

      - if: steps.detect.outputs.changed == 'true'
        id: pr
        uses: peter-evans/create-pull-request@v8
        with:
          branch: automation/golangci-lint-version-sync
          delete-branch: true
          commit-message: "Bump golangci-lint to ${{ steps.detect.outputs.latest }}"
          title: "Bump golangci-lint to ${{ steps.detect.outputs.latest }}"
          body: |
            Automated golangci-lint upstream sync.

            - Previous: `${{ steps.detect.outputs.current }}`
            - New: `${{ steps.detect.outputs.latest }}`

            Result of running the new version against the tree: `${{ steps.lint.outcome }}`.
            A failure here is expected when a release adds checks; the findings are in the
            job log of the run that opened this PR.

      - if: steps.pr.outputs.pull-request-operation == 'created'
        env:
          GH_TOKEN: ${{ github.token }}
        run: gh workflow run ci.yaml --ref automation/golangci-lint-version-sync