#!/bin/bash
# Minify index.html from src/ to production version
# Usage: ./minify.sh

set -e

SRC_FILE="$(dirname "$0")/src/index.html"
OUT_FILE="$(dirname "$0")/index.html"
TEMP_FILE="${OUT_FILE}.tmp"

if [ ! -f "$SRC_FILE" ]; then
    echo "❌ Source file not found: $SRC_FILE"
    exit 1
fi

echo "🔨 Minifying HTML..."
echo "  Input:  $SRC_FILE"
echo "  Output: $OUT_FILE"

perl -e "
use strict;
use warnings;

open(my \$fh, '<', '$SRC_FILE') or die \$!;
my \$content = do { local \$/; <\$fh> };
close(\$fh);

# Remove HTML comments
\$content =~ s/<!--.*?-->//gs;

# Compress CSS (remove spaces and comments)
\$content =~ s/(<style[^>]*>)(.*?)(<\/style>)/
  my \$before = \$1;
  my \$style = \$2;
  my \$after = \$3;
  \$style =~ s{\/\*.*?\*\/}{}gs;
  \$style =~ s{\s+}{ }gs;
  \$style =~ s{\s*([{}:;,>+~])\s*}{\$1}gs;
  \$before . \$style . \$after;
/gies;

# Compress JavaScript (remove comments and extra spaces)
\$content =~ s/(<script[^>]*>)(.*?)(<\/script>)/
  my \$before = \$1;
  my \$script = \$2;
  my \$after = \$3;
  \$script =~ s{\/\/.*\$}{}gm;
  \$script =~ s{\s+}{ }gs;
  \$script =~ s{\s*([{}();,])\s*}{\$1}gs;
  \$before . \$script . \$after;
/gies;

# Remove whitespace between tags
\$content =~ s/>\s+</></gs;

# Compress general whitespace
\$content =~ s/\s+/ /gs;

# Trim
\$content =~ s/^\s+|\s+\$//g;

open(my \$out, '>', '$TEMP_FILE') or die \$!;
print \$out \$content;
close(\$out);
" || {
    echo "❌ Minification failed"
    rm -f "$TEMP_FILE"
    exit 1
}

mv "$TEMP_FILE" "$OUT_FILE"

# Show statistics
original=$(wc -c < "$SRC_FILE")
minified=$(wc -c < "$OUT_FILE")
saved=$((original - minified))
percent=$((saved * 100 / original))

echo ""
echo "✅ Minification complete!"
echo ""
echo "📊 Compression statistics:"
printf "  Original:  %6d bytes\n" "$original"
printf "  Minified:  %6d bytes\n" "$minified"
printf "  Saved:     %6d bytes (%d%%)\n" "$saved" "$percent"
echo ""
echo "✅ $OUT_FILE is ready for production"