name: Deploy to Railway

on:
  push:
    branches:
      - master
  workflow_dispatch:

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-deploy:
    name: Build and Deploy
    runs-on: ubuntu-latest
    outputs:
      digest: ${{ steps.docker_build.outputs.digest }}
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Read emsdk version from package.json
        id: versions
        run: |
          EMSDK_VERSION=$(jq -r '.config.emsdkVersion' package.json)
          if [ -z "$EMSDK_VERSION" ] || [ "$EMSDK_VERSION" = "null" ]; then
            echo "::error::emsdkVersion not found in package.json config"
            exit 1
          fi
          echo "emsdk=$EMSDK_VERSION" >> $GITHUB_OUTPUT

      # ========== Docker Build and Push ==========
      # Note: WASM and frontend are built inside Docker using multi-stage build
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=sha,prefix={{branch}}-
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push Docker image
        id: docker_build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./pacman-server/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          build-args: |
            GIT_COMMIT_SHA=${{ github.sha }}
            EMSDK_VERSION=${{ steps.versions.outputs.emsdk }}

      # Wait for ghcr.io propagation (paranoid safety)
      - name: Wait for registry propagation
        run: sleep 5

  # Deploy to Railway - separate job to use container properly
  deploy:
    name: Deploy to Railway
    runs-on: ubuntu-latest
    needs: build-and-deploy
    container: ghcr.io/railwayapp/cli:latest
    env:
      RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN }}
    steps:
      - name: Check Railway Token
        run: |
          if [ -z "$RAILWAY_TOKEN" ]; then
            echo "::warning::RAILWAY_TOKEN not available - deployment skipped (common for Dependabot PRs)"
            exit 0
          fi

      - name: Generate proxy Dockerfile
        if: env.RAILWAY_TOKEN != ''
        run: echo "FROM ghcr.io/xevion/pac-man@${{ needs.build-and-deploy.outputs.digest }}" > Dockerfile

      - name: Deploy to Railway
        if: env.RAILWAY_TOKEN != ''
        run: railway up --service pac-man