name: '🔥 TinyTorch · 👁️ Preview (Dev)'

# Builds and deploys TinyTorch site to dev preview
# Triggers after Validate (Dev) passes, builds PDFs, then deploys

on:
  workflow_dispatch:
  workflow_run:
    workflows: ["🔥 TinyTorch · ✅ Validate (Dev)"]
    types: [completed]
    branches: [dev]

concurrency:
  group: tinytorch-dev-deploy
  cancel-in-progress: true

jobs:
  # Build PDFs (only if Validate passed or manual trigger)
  build-pdfs:
    name: '📚 Build PDFs'
    if: (github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.head_branch == 'dev') || github.event_name == 'workflow_dispatch'
    uses: ./.github/workflows/tinytorch-build-pdfs.yml

  # Build and deploy (after PDFs complete - deploys even if PDFs fail)
  build-and-deploy:
    name: '🔥 Build & Deploy TinyTorch Dev'
    runs-on: ubuntu-latest
    needs: [build-pdfs]
    if: |
      always() && 
      ((github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.head_branch == 'dev') || github.event_name == 'workflow_dispatch')
    permissions:
      contents: read
      actions: read

    steps:
      - name: 📥 Checkout
        uses: actions/checkout@v6

      - name: 🐍 Setup Python
        uses: actions/setup-python@v6
        with:
          python-version: '3.11'
          cache: 'pip'
          cache-dependency-path: 'tinytorch/site/requirements.txt'

      - name: 📦 Install dependencies
        working-directory: tinytorch
        run: |
          pip install --upgrade pip
          pip install -r site/requirements.txt

      - name: 👥 Generate team page from contributors
        working-directory: tinytorch/site
        run: |
          echo "👥 Generating team page from .all-contributorsrc..."
          python3 scripts/generate_team.py
          echo "✅ Team page generated"

      - name: 🔨 Build Jupyter Book
        working-directory: tinytorch/site
        run: |
          echo "🔨 Building TinyTorch Jupyter Book..."
          jupyter-book build . --all
          touch _build/html/.nojekyll
          echo "✅ Build complete"

      - name: 📥 Download PDF Guide
        uses: actions/download-artifact@v7
        continue-on-error: true
        with:
          name: TinyTorch-Guide
          path: ./pdf-artifacts/guide

      - name: 📥 Download PDF Paper
        uses: actions/download-artifact@v7
        continue-on-error: true
        with:
          name: TinyTorch-Paper
          path: ./pdf-artifacts/paper

      - name: 📁 Inject PDFs into site
        run: |
          echo "📁 Injecting PDFs into built site..."
          mkdir -p tinytorch/site/_build/html/_static/downloads

          if [ -f ./pdf-artifacts/guide/tinytorch-course.pdf ]; then
            cp ./pdf-artifacts/guide/tinytorch-course.pdf tinytorch/site/_build/html/_static/downloads/TinyTorch-Guide.pdf
            echo "✅ Injected TinyTorch-Guide.pdf"
          else
            echo "⚠️ Guide PDF not found"
          fi

          if [ -f ./pdf-artifacts/paper/paper.pdf ]; then
            cp ./pdf-artifacts/paper/paper.pdf tinytorch/site/_build/html/_static/downloads/TinyTorch-Paper.pdf
            echo "✅ Injected TinyTorch-Paper.pdf"
          else
            echo "⚠️ Paper PDF not found"
          fi

          echo ""
          echo "📦 Downloads folder contents:"
          ls -la tinytorch/site/_build/html/_static/downloads/ || echo "No downloads folder"

      - name: 📊 Download slide decks from release
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          echo "📊 Downloading slide decks from GitHub release..."
          mkdir -p tinytorch/site/_build/html/_static/slides

          # Download all PDFs from the slides release
          gh release download tinytorch-slides-v0.1.0 \
            --repo harvard-edge/cs249r_book \
            --pattern "*.pdf" \
            --dir tinytorch/site/_build/html/_static/slides

          echo ""
          echo "📦 Slides folder contents:"
          ls -la tinytorch/site/_build/html/_static/slides/ || echo "No slides folder"
          echo "✅ Downloaded $(ls tinytorch/site/_build/html/_static/slides/*.pdf 2>/dev/null | wc -l) slide decks"

      - name: 🚀 Deploy to Dev Site via SSH
        env:
          SSH_DEPLOY_KEY: ${{ secrets.SSH_DEPLOY_KEY }}
        run: |
          echo "🔐 Starting ssh-agent..."
          eval "$(ssh-agent -s)"
          echo "$SSH_DEPLOY_KEY" | tr -d '\r' | ssh-add - > /dev/null

          # Add github.com to known hosts
          mkdir -p ~/.ssh
          ssh-keyscan github.com >> ~/.ssh/known_hosts

          echo "🔧 Configuring git..."
          git config --global user.email "actions@github.com"
          git config --global user.name "GitHub Actions"

          echo "🔄 Cloning dev preview repository (${{ vars.DEV_REPO }})..."
          git clone --depth=1 ${{ vars.DEV_REPO_URL }} target-repo

          cd target-repo

          echo "🧹 Cleaning ${{ vars.DEV_TINYTORCH_PATH }} directory..."
          rm -rf ${{ vars.DEV_TINYTORCH_PATH }}
          mkdir -p ${{ vars.DEV_TINYTORCH_PATH }}

          echo "🚚 Copying TinyTorch site content..."
          cp -r "${{ github.workspace }}/tinytorch/site/_build/html/." ${{ vars.DEV_TINYTORCH_PATH }}/

          echo "🔍 Validating deployment content..."
          if [ ! -f "${{ vars.DEV_TINYTORCH_PATH }}/index.html" ]; then
            echo "❌ CRITICAL: ${{ vars.DEV_TINYTORCH_PATH }}/index.html is missing. Aborting deployment."
            exit 1
          fi

          echo "📦 Contents of ${{ vars.DEV_TINYTORCH_PATH }}/:"
          ls -la ${{ vars.DEV_TINYTORCH_PATH }}/ | head -10

          echo "📦 Committing and pushing changes..."
          git add .
          git commit -m "🔥 Deploy TinyTorch dev to /${{ vars.DEV_TINYTORCH_PATH }}/ from ${{ github.sha }}" --allow-empty || echo "🟡 Nothing to commit"
          git push origin main

          echo "✅ TinyTorch deployed to: https://harvard-edge.github.io/${{ vars.DEV_REPO }}/${{ vars.DEV_TINYTORCH_PATH }}/"