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@v5

      - name: Setup Emscripten SDK
        uses: pyodide/setup-emsdk@v15
        with:
          version: 3.1.43
          actions-cache-folder: "emsdk-cache-b"

      - name: Setup Rust (WASM32 Emscripten)
        uses: dtolnay/rust-toolchain@master
        with:
          target: wasm32-unknown-emscripten
          toolchain: 1.86.0

      - name: Rust Cache
        uses: Swatinem/rust-cache@v2

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

      # ========== WASM Build ==========
      - name: Build WASM with Emscripten
        shell: bash
        run: |
          # Retry mechanism for Emscripten build - only retry on specific hash errors
          MAX_RETRIES=3
          RETRY_DELAY=30

          for attempt in $(seq 1 $MAX_RETRIES); do
            echo "Build attempt $attempt of $MAX_RETRIES"

            # Capture output and check for specific error while preserving real-time output
            if bun run -i pacman/web.build.ts 2>&1 | tee /tmp/build_output.log; then
              echo "Build successful on attempt $attempt"
              break
            else
              echo "Build failed on attempt $attempt"

              # Check if the failure was due to the specific hash error
              if grep -q "emcc: error: Unexpected hash:" /tmp/build_output.log; then
                echo "::warning::Detected 'emcc: error: Unexpected hash:' error - will retry (attempt $attempt of $MAX_RETRIES)"

                if [ $attempt -eq $MAX_RETRIES ]; then
                  echo "::error::All retry attempts failed. Exiting with error."
                  exit 1
                fi

                echo "Waiting $RETRY_DELAY seconds before retry..."
                sleep $RETRY_DELAY

                # Exponential backoff: double the delay for next attempt
                RETRY_DELAY=$((RETRY_DELAY * 2))
              else
                echo "Build failed but not due to hash error - not retrying"
                exit 1
              fi
            fi
          done

      # ========== Docker Build and Push ==========
      # Note: Frontend is now 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 }}

      # 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: ${{ secrets.RAILWAY_TOKEN }}
    steps:
      - name: Generate proxy Dockerfile
        run: echo "FROM ghcr.io/xevion/pac-man@${{ needs.build-and-deploy.outputs.digest }}" > Dockerfile

      - name: Deploy to Railway
        run: railway up --service pac-man