#!/bin/bash
# Minify HTML files from src/ to production versions
# Usage: ./minify.sh

set -e

BASE_DIR="$(dirname "$0")"
FILES=("index.html" "architecture-diagram.html")

minify_file() {
    local filename="$1"
    local SRC_FILE="${BASE_DIR}/src/${filename}"
    local OUT_FILE="${BASE_DIR}/${filename}"
    local TEMP_FILE="${OUT_FILE}.tmp"

    if [ ! -f "$SRC_FILE" ]; then
        echo "⚠️  Source file not found: $SRC_FILE (skipping)"
        return 0
    fi

    echo ""
    echo "🔨 Minifying ${filename}..."
    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 "  📊 Compression statistics:"
    printf "    Original:  %6d bytes\n" "$original"
    printf "    Minified:  %6d bytes\n" "$minified"
    printf "    Saved:     %6d bytes (%d%%)\n" "$saved" "$percent"
    echo "  ✅ ${filename} ready for production"
}

# Minify all files
echo "🚀 Starting HTML minification..."

for file in "${FILES[@]}"; do
    minify_file "$file"
done

echo ""
echo "✅ All files minified successfully!"
echo ""