name: Build & Deploy (Nix)

on:
  push:
    branches: [main]
  workflow_dispatch:

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

permissions:
  contents: read
  id-token: write

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

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0
          submodules: false

      - uses: oven-sh/setup-bun@v2
        with:
          bun-version: latest

      - name: Install deps (root workspace)
        run: bun install --frozen-lockfile

      - name: Test API
        working-directory: apps/api
        run: bun test

  build-and-deploy:
    needs: test
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      max-parallel: 1
      matrix:
        service: [api, ml-service, web]
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0
          submodules: false

      - 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
        with:
          use-flakehub: false

      - name: Build zeavis-${{ matrix.service }}
        id: build
        run: |
          STORE_PATH=$(nix build .#${{ matrix.service }} --impure --option sandbox false --no-link --print-out-paths | tail -1)
          echo "store-path=$STORE_PATH" >> "$GITHUB_OUTPUT"
          echo "Build OK zeavis-${{ matrix.service }}: $STORE_PATH"

      - name: Setup SSH key
        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 zeavis-${{ matrix.service }} to VPS
        run: |
          STORE_PATH="${{ steps.build.outputs.store-path }}"
          echo "=== Copying zeavis-${{ matrix.service }}: $STORE_PATH ==="
          nix copy --to "ssh://$VPS_USER@$VPS_HOST" "$STORE_PATH"

          echo "=== Updating profile + restarting ==="
          ssh "$VPS_USER@$VPS_HOST" "
            set -eu
            if [ -d /nix/var/nix/profiles/zeavis-${{ matrix.service }} ] && [ ! -L /nix/var/nix/profiles/zeavis-${{ matrix.service }} ]; then
              rm -rf /nix/var/nix/profiles/zeavis-${{ matrix.service }}
            fi
            sudo /nix/var/nix/profiles/default/bin/nix-env --profile /nix/var/nix/profiles/zeavis-${{ matrix.service }} --set '$STORE_PATH'
            sudo systemctl daemon-reload
            sudo systemctl enable zeavis-${{ matrix.service }} 2>/dev/null || true
            sudo systemctl restart zeavis-${{ matrix.service }}
            for i in \$(seq 1 30); do
              systemctl is-active --quiet zeavis-${{ matrix.service }} && break
              sleep 1
            done
            systemctl is-active zeavis-${{ matrix.service }} || {
              echo '=== SERVICE FAILED — journal ==='
              journalctl -u zeavis-${{ matrix.service }} -n 40 --no-pager
              exit 1
            }
            systemctl status zeavis-${{ matrix.service }} --no-pager 2>&1 | head -8
          "
          echo "✅ zeavis-${{ matrix.service }} deployed"

  cleanup:
    # Bersihkan sampah Nix di VPS SETELAH deploy: hapus generasi profile lama
    # + nix store gc. Profil yang sedang dipakai tidak disentuh.
    needs: build-and-deploy
    if: always()
    runs-on: ubuntu-latest
    steps:
      - name: Nix GC on VPS
        env:
          VPS_HOST: ${{ secrets.VPS_HOST }}
          VPS_USER: ${{ secrets.VPS_USER }}
          SSH_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
        run: |
          mkdir -p ~/.ssh
          echo "$SSH_KEY" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          ssh-keyscan -H "$VPS_HOST" >> ~/.ssh/known_hosts 2>/dev/null
          ssh "$VPS_USER@$VPS_HOST" "sudo /usr/local/bin/nix-gc-vps.sh" || echo "⚠️ Nix GC gagal (non-fatal)"