# Reference: https://github.com/ryoppippi/dotfiles/blob/main/.github/workflows/update-flake.yaml
name: "Bot: Update flake inputs"
on:
  schedule:
    - cron: "0 6 * * *"
  workflow_dispatch:
concurrency:
  group: ${{ github.workflow }}
  cancel-in-progress: false
permissions:
  contents: write
  pull-requests: write
jobs:
  update:
    name: Update and check Linux
    runs-on: ubuntu-latest
    timeout-minutes: 180
    outputs:
      changed: ${{ steps.update.outputs.changed }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: Setup Nix
        uses: ./.github/actions/setup-nix
      - name: Update flake inputs
        id: update
        shell: bash
        run: |
          set -euo pipefail
          nix flake update
          if git diff --quiet -- flake.lock; then
            echo 'changed=false' >> "$GITHUB_OUTPUT"
          else
            echo 'changed=true' >> "$GITHUB_OUTPUT"
          fi
      - name: Evaluate every flake system
        if: steps.update.outputs.changed == 'true'
        shell: bash
        run: |
          set -euo pipefail
          nix flake check \
            --no-build \
            --all-systems \
            --keep-going \
            --show-trace
      - name: Build Linux checks
        if: steps.update.outputs.changed == 'true'
        uses: ./.github/actions/check-nixos
      - name: Upload updated lock file
        if: steps.update.outputs.changed == 'true'
        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
        with:
          name: flake-lock
          path: flake.lock
          if-no-files-found: error

  check-darwin:
    name: Check Darwin
    needs: update
    if: needs.update.outputs.changed == 'true'
    runs-on: macos-15
    timeout-minutes: 180
    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: Download updated lock file
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
        with:
          name: flake-lock
          path: .
      - name: Setup Nix
        uses: ./.github/actions/setup-nix
      - name: Build Darwin checks
        shell: bash
        run: |
          set -euo pipefail
          nix run .#nix-fast-build -- \
            --flake .#checks.aarch64-darwin \
            --skip-cached \
            --no-nom \
            --no-link

  pull-request:
    name: Create update pull request
    needs:
      - update
      - check-darwin
    if: needs.update.outputs.changed == 'true'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: Download validated lock file
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
        with:
          name: flake-lock
          path: .
      - name: Create update pull request
        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          add-paths: flake.lock
          branch: automation/update-flake-lock
          delete-branch: true
          commit-message: "flake: update inputs"
          title: "flake: update inputs"
          body: |
            Automated update of `flake.lock`.

            The updated inputs passed all-system evaluation and native builds of
            the Linux and Darwin check sets.