name: Auto update
on:
  workflow_dispatch:
  schedule:
    - cron: "0 0 * * *"

jobs:
  update:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Check for updates
        id: check
        run: |
          local=$(cat flake.lock | jq ".nodes.nixpkgs.locked.rev")
          remote=$(curl "https://api.github.com/repos/NixOS/nixpkgs/branches/nixos-unstable/commits?per_page=1" | jq ".commit.sha")
          if [[ $local == $remote ]]; then
            echo "skip=1" >> "$GITHUB_OUTPUT"
          else
            echo "skip=0" >> "$GITHUB_OUTPUT"
            branch=$(TZ='Australia/Melbourne' date '+staging_auto/%Y%m%d')
            echo "branch_name=${branch}" >> "$GITHUB_OUTPUT"
          fi

      - name: Install nix
        if: steps.check.outputs.skip == 0
        uses: cachix/install-nix-action@v31

      - name: Configure git
        if: steps.check.outputs.skip == 0
        run: |
          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"

      - name: Update
        if: steps.check.outputs.skip == 0
        run: ./update.sh

      - name: Push
        if: steps.check.outputs.skip == 0
        uses: ad-m/github-push-action@master
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          branch: ${{ steps.check.outputs.branch_name }}