name: Update flake.lock

on:
  workflow_call:
    inputs:
      commit-msg:
        description: summary for lockfile commit
        required: true
        type: string
      inputs:
        description: flake inputs to update
        required: false
        default: ""
        type: string

jobs:
  update:
    name: Update & make PR
    runs-on: ubuntu-latest

    permissions:
      contents: write
      pull-requests: write

    steps:
      - uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v10

      - name: Update lockfile & make PR
        uses: DeterminateSystems/update-flake-lock@v21
        id: update
        with:
          commit-msg: ${{ inputs.commit-msg }}
          inputs: ${{ inputs.inputs }}
          pr-title: ${{ inputs.commit-msg }}
          token: ${{ github.token }}

      - name: Enable auto-merge
        shell: bash
        run: gh pr merge --auto --rebase "$PR_ID"
        env:
          GH_TOKEN: ${{ github.token }}
          PR_ID: ${{ steps.update.outputs.pull-request-number }}