name: Deploy infrastructure

on:
  check_suite:
    types: [completed]
  workflow_dispatch:

jobs:
  nixos:
    name: Deploy NixOS systems
    runs-on: ubuntu-latest

    # 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 >= 10
      && github.event.check_suite.head_branch == 'main'

    concurrency:
      group: deploy
      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: 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 cache
        uses: terraform-cache/terraform-cache@v1

      - name: Authenticate with TF Cloud
        run: |
          dir="$HOME/.terraform.d"
          [ ! -d "$dir" ] && mkdir -p "$dir"

          cat > "$dir"/credentials.tfrc.json << EOF
          {
            "credentials": {
              "app.terraform.io": {
                "token": "${{ secrets.TF_API_TOKEN }}"
              }
            }
          }
          EOF

      - name: Generate configuration
        run: nix run .#gen-tf

      - name: Init workspace
        run: |
          nix develop --accept-flake-config \
            --command tofu init

      - name: Validate plan
        run: |
          nix develop --accept-flake-config \
            --command tofu validate

      - name: Apply
        run: |
          nix develop --accept-flake-config \
            --command tofu apply -auto-approve