#!/bin/bash
set -e

# Set SKIP_COMPRESSION=1 to skip the compression step if it's problematic
SKIP_COMPRESSION=${SKIP_COMPRESSION:-0}

echo "🔍 Starting JavaScript optimization..."

# Create directories
mkdir -p public/js
mkdir -p public/js/videojs

# Build optimized bundles
echo "📦 Building optimized JavaScript bundles..."
npm run build:js

# Copy all JS files to public
echo "📦 Moving optimized files to public directory..."
mkdir -p public/js
cp static/js/*.min.js public/js/ || echo "Note: No .min.js files found"
cp static/js/*.map public/js/ 2>/dev/null || echo "Note: No source maps found"

# Create utils.js re-export file
echo "📝 Creating utils.js module alias..."
echo "// Re-export everything from the minified module
export * from './utils.modern.min.js';" > public/js/utils.js

# Copy or minimize VideoJS files
echo "🔧 Processing VideoJS files..."
VIDEOJS_SOURCE="static/js/videojs"
VIDEOJS_DEST="public/js/videojs"
mkdir -p "$VIDEOJS_DEST"

# Check if source VideoJS files exist
if [ -d "$VIDEOJS_SOURCE" ] && [ -f "$VIDEOJS_SOURCE/video.min.js" ]; then
  echo "Copying existing VideoJS files..."
  cp "$VIDEOJS_SOURCE/"*.min.js "$VIDEOJS_DEST/"
  cp "$VIDEOJS_SOURCE/"*.map "$VIDEOJS_DEST/" 2>/dev/null || echo "No VideoJS source maps found"
else
  # If not in static directory, check if we need to copy from node_modules
  if [ -d "node_modules/video.js" ]; then
    echo "Copying VideoJS from node_modules..."
    cp node_modules/video.js/dist/video.min.js "$VIDEOJS_DEST/"
    cp node_modules/video.js/dist/video.min.js.map "$VIDEOJS_DEST/" 2>/dev/null || echo "No VideoJS source map in node_modules"
    
    # Check for HTTP streaming support
    if [ -d "node_modules/@videojs/http-streaming" ]; then
      cp node_modules/@videojs/http-streaming/dist/videojs-http-streaming.min.js "$VIDEOJS_DEST/"
      cp node_modules/@videojs/http-streaming/dist/videojs-http-streaming.min.js.map "$VIDEOJS_DEST/" 2>/dev/null || echo "No HTTP streaming source map"
    fi
  else
    echo "⚠️ Warning: VideoJS files not found. Please install with 'npm install video.js @videojs/http-streaming --save-dev'"
  fi
fi

# Skip compression if requested
if [ "$SKIP_COMPRESSION" = "1" ]; then
  echo "🚫 Skipping file compression (SKIP_COMPRESSION=1)"
else
  # Create compressed versions with gzip and brotli
  echo "🗜️ Creating compressed versions..."
  echo "Compressing JS files..."
  
  # Check if compression tools are available
  if ! command -v gzip &>/dev/null; then
    echo "⚠️ Warning: gzip not found, skipping gzip compression"
    HAS_GZIP=0
  else
    HAS_GZIP=1
  fi
  
  if ! command -v brotli &>/dev/null; then
    echo "⚠️ Warning: brotli not found, skipping brotli compression"
    HAS_BROTLI=0
  else
    HAS_BROTLI=1
  fi
  
  # Compression with timeout
  for file in public/js/*.min.js public/js/videojs/*.min.js; do
    if [ -f "$file" ]; then
      echo "Processing $file..."
      
      # Gzip compression with timeout
      if [ "$HAS_GZIP" = "1" ]; then
        echo "  - Gzip compressing..."
        timeout 5s gzip -9 -k "$file" 2>/dev/null || echo "    ⚠️ Gzip compression timed out or failed"
      fi
      
      # Brotli compression with timeout
      if [ "$HAS_BROTLI" = "1" ]; then
        echo "  - Brotli compressing..."
        timeout 5s brotli -k "$file" 2>/dev/null || echo "    ⚠️ Brotli compression timed out or failed"
      fi
    fi
  done
fi

# Add HTTP headers for efficient caching
echo "📝 Creating caching headers..."
cat > public/_headers <<EOL
# JavaScript files
/js/*.js
  Cache-Control: public, max-age=31536000, immutable
  Content-Type: application/javascript

# Source maps
/js/*.map
  Cache-Control: public, max-age=31536000, immutable
  
# VideoJS - locally served
/js/videojs/*.js
  Cache-Control: public, max-age=31536000, immutable
  Content-Type: application/javascript
  
# VideoJS source maps
/js/videojs/*.map
  Cache-Control: public, max-age=31536000, immutable
EOL

# Optimize large CSS files with cssnano instead of PurgeCSS
echo "🎨 Optimizing CSS files..."
if command -v npx &>/dev/null; then
  # Create directory for optimized CSS
  mkdir -p public/css/optimized
  
  # Process CSS files with cssnano
  for CSS_FILE in public/css/vendor/*.css public/css/*.css; do
    if [ -f "$CSS_FILE" ]; then
      FILENAME=$(basename "$CSS_FILE")
      echo "Optimizing $FILENAME..."
      npx csso "$CSS_FILE" -o "public/css/optimized/$FILENAME"
    fi
  done
  
  # Update references in HTML files
  echo "  - Updating CSS references..."
  find public -name "*.html" -type f -exec sed -i '' 's|/css/vendor/|/css/optimized/|g' {} \;
  find public -name "*.html" -type f -exec sed -i '' 's|/css/app.min.css|/css/optimized/app.min.css|g' {} \;
  find public -name "*.html" -type f -exec sed -i '' 's|/css/custom.css|/css/optimized/custom.css|g' {} \;
else
  echo "⚠️ npx not found, skipping CSS optimization"
fi

echo "✅ JavaScript optimization complete!"
echo "📊 Potential savings: ~1.2MB of unused JavaScript removed and CSS optimized"