name: Nix Build & Deploy — All Services

on:
  # No `paths` filter: GitHub's path filters do not match submodule gitlink
  # changes, so a submodule pointer update (e.g. from update-submodule.yml)
  # would never trigger this deploy. Run on every push to main instead.
  push:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: nix-deploy
  cancel-in-progress: false

permissions:
  contents: read

env:
  VPS_HOST: ${{ secrets.VPS_HOST }}
  VPS_USER: ${{ secrets.VPS_USER }}

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        service: [hub, scraper, tools-gateway, tools-workers, tools-frontend, llm-api]

    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          submodules: recursive
          fetch-depth: 0

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v22
        with:
          determinate: false
          extra-conf: |
            sandbox = false
            accept-flake-config = true

      - name: Cache Nix
        uses: DeterminateSystems/magic-nix-cache-action@v14

      - name: Build ${{ matrix.service }}
        id: build
        run: |
          nix build .#${{ matrix.service }} --impure --option sandbox false --print-build-logs
          STORE_PATH=$(readlink result)
          echo "store-path=$STORE_PATH" >> "$GITHUB_OUTPUT"
          echo "✅ ${{ matrix.service }}: $STORE_PATH"

      - name: Setup SSH key
        if: github.ref == 'refs/heads/main'
        env:
          SSH_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
        run: |
          mkdir -p ~/.ssh
          echo "$SSH_KEY" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          sed -i 's/\r$//' ~/.ssh/id_ed25519
          ssh-keygen -y -f ~/.ssh/id_ed25519 >/dev/null 2>&1 || { echo "SSH key invalid"; exit 1; }
          ssh-keyscan -H "$VPS_HOST" >> ~/.ssh/known_hosts 2>/dev/null

      - name: Deploy ${{ matrix.service }} to VPS
        if: github.ref == 'refs/heads/main'
        run: |
          STORE_PATH="${{ steps.build.outputs.store-path }}"
          echo "=== Copying ${{ matrix.service }}: $STORE_PATH ==="
          nix copy --to "ssh://$VPS_USER@$VPS_HOST" "$STORE_PATH"

          echo "=== Updating profile ==="
          ssh "$VPS_USER@$VPS_HOST" "sudo /nix/var/nix/profiles/default/bin/nix-env --profile /nix/var/nix/profiles/${{ matrix.service }} --set '$STORE_PATH'"

          echo "=== Restarting service ==="
          ssh "$VPS_USER@$VPS_HOST" "sudo systemctl restart ${{ matrix.service }}" || echo "  ⚠️ restart failed (may not be enabled yet)"

          echo "✅ ${{ matrix.service }} deployed"