name: Build & Deploy (Bun)

on:
  push:
    branches: [main]
  workflow_dispatch:

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

permissions:
  contents: read
  id-token: write

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

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Setup Bun
        uses: oven-sh/setup-bun@v2
        with:
          bun-version: 1.3.14

      - name: Typecheck + tests
        working-directory: server
        run: |
          bun install --frozen-lockfile
          bunx tsc --noEmit
          bun test

      - name: Build single binary
        working-directory: server
        run: |
          bun build --compile src/index.ts --outfile pr-agent-bun
          ls -lh pr-agent-bun

      - 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 to VPS
        run: |
          echo "=== Uploading pr-agent-bun binary ==="
          scp server/pr-agent-bun "$VPS_USER@$VPS_HOST:/tmp/pr-agent-bun.new"

          echo "=== Staging swap + restart ==="
          ssh "$VPS_USER@$VPS_HOST" '
            set -e
            sudo cp /opt/pr-agent-server/bin/pr-agent-bun /opt/pr-agent-server/bin/pr-agent-bun.prev
            sudo mv /tmp/pr-agent-bun.new /opt/pr-agent-server/bin/pr-agent-bun
            sudo chown root:root /opt/pr-agent-server/bin/pr-agent-bun
            sudo chmod 755 /opt/pr-agent-server/bin/pr-agent-bun
            sudo systemctl restart pr-agent-bun.service
            sleep 3
            systemctl is-active pr-agent-bun.service
            curl -fsS http://127.0.0.1:4023/health
          '
          echo "✅ pr-agent-bun 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)"