#!/bin/bash
# Minify HTML files from src/ to production versions
# Usage: ./minify.sh
# Processes: stratumiops-arch, stratumiops-pipeline, stratumiops-orchestrator

set -e

SCRIPT_DIR="$(dirname "$0")"
FILES=("stratumiops-arch" "stratumiops-pipeline" "stratumiops-orchestrator")

minify_file() {
    local basename=$1
    local src_file="${SCRIPT_DIR}/src/${basename}.html"
    local out_file="${SCRIPT_DIR}/${basename}.html"
    local temp_file="${out_file}.tmp"

    if [ ! -f "$src_file" ]; then
        echo "⚠️  Skipping $basename: source file not found: $src_file"
        return 0
    fi

    echo "🔨 Minifying $basename.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 for $basename"
        rm -f "$temp_file"
        return 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 "  ✅ $basename.html minified"
    printf "     Original:  %6d bytes | Minified:  %6d bytes | Saved: %d%% (%d bytes)\n" "$original" "$minified" "$percent" "$saved"
    echo ""
}

echo "🔨 Minifying HTML files..."
echo ""

for file in "${FILES[@]}"; do
    minify_file "$file" || exit 1
done

echo "✅ All HTML files minified and ready for production"