name: Deploy infrastructure

on:
  check_suite:
    types: [completed]
  workflow_dispatch:

jobs:
  nixos:
    name: Deploy NixOS systems

    runs-on: ubuntu-latest

    concurrency:
      group: deploy
      cancel-in-progress: true

    # https://github.com/sellout/bash-strict-mode/commit/9bf1d65c2f786a9887facfcb81e06d8b8b5f4667
    if: github.event.check_suite.app.name == 'Garnix CI'
      && github.event.check_suite.conclusion == 'success'
      && github.event.check_suite.latest_check_runs_count >= 12
      && github.event.check_suite.head_branch == 'main'

    steps:
      - uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v9

      - name: Setup local Nix cache
        uses: DeterminateSystems/magic-nix-cache-action@v2

      - name: Connect to Tailscale
        uses: tailscale/github-action@v2
        with:
          oauth-client-id: ${{ secrets.TS_OAUTH_CLIENT_ID }}
          oauth-secret: ${{ secrets.TS_OAUTH_SECRET }}
          tags: tag:gha

      - name: Copy known_hosts
        run: |
          set -eux

          [ ! -d ~/.ssh ] && mkdir -p ~/.ssh
          cp .known_hosts ~/.ssh/known_hosts

      - name: Run deploy
        run: |
          nix develop --accept-flake-config \
            --command deploy

  opentofu:
    name: Apply OpenTofu plan
    needs: nixos

    runs-on: ubuntu-latest

    concurrency:
      group: tofu
      cancel-in-progress: true

    steps:
      - uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v9

      - name: Setup local Nix cache
        uses: DeterminateSystems/magic-nix-cache-action@v2

      - name: Setup OpenTofu
        uses: opentofu/setup-opentofu@v1
        with:
          cli_config_credentials_token: ${{ secrets.TF_API_TOKEN }}

      - name: Setup OpenTofu cache
        uses: terraform-cache/terraform-cache@v1

      - name: Run plan
        run: nix run .#plan

      - name: Apply
        run: tofu apply -auto-approve