name: Build & Deploy (Nix)

on:
  push:
    branches:
      - main

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Build with Nix
        run: |
          set -eu

          # Install Nix via DeterminateSystems (CI container doesn't have Nix)
          curl -fsSL https://install.determinate.systems/nix \
            | sh -s -- install --no-confirm 2>&1

          # Source Nix profile
          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh

          # Build
          nix build .#teleuploader --impure --option sandbox false 2>&1

          # Save store path for next step
          STORE_PATH=$(readlink result)
          echo "$STORE_PATH" > /tmp/teleuploader-store-path

      - name: Copy binary to target VPS & deploy
        env:
          VPS_HOST: ${{ secrets.VPS_HOST }}
          VPS_USER: ${{ secrets.VPS_USER }}
          VPS_SSH_KEY_VALUE: ${{ secrets.VPS_SSH_KEY_VALUE }}
        run: |
          set -eu

          # Source Nix profile
          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh

          STORE_PATH=$(cat /tmp/teleuploader-store-path)
          echo "=== Store path: $STORE_PATH"

          # Write SSH key
          key_file=$(mktemp /tmp/deploy-key.XXXXXX)
          printf '%s\n' "$VPS_SSH_KEY_VALUE" > "$key_file"
          chmod 600 "$key_file"

          # Copy binary closure to target VPS via Nix SSH store
          export NIX_SSHOPTS="-i $key_file -o StrictHostKeyChecking=no"
          nix copy --to "ssh://${VPS_USER}@${VPS_HOST}" "$STORE_PATH" 2>&1

          # Deploy: set profile + restart service
          ssh -i "$key_file" -o StrictHostKeyChecking=no \
            "${VPS_USER}@${VPS_HOST}" "
            nix-env --profile /nix/var/nix/profiles/teleuploader --set $STORE_PATH
            systemctl restart teleuploader
            sleep 3
            systemctl status teleuploader --no-pager 2>&1 | head -15
          " 2>&1