#!/bin/bash
#
# make-executable.sh - Create self-extracting searchable archive
#
# Usage:
#   ./make-executable.sh archive.tar.gz
#   ./archive.run
#
# The resulting .run file is a single executable that:
#   1. Extracts the Python serve.py to /tmp
#   2. Runs it pointing at itself as the tarball source
#   3. Serves the archive on http://localhost:6543
#
# Requirements:
#   - gcc with zlib (-lz)
#   - python3 with pyramid installed (on target system)

set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
BOOTSTRAP_C="$SCRIPT_DIR/bootstrap.c"

if [ $# -lt 1 ]; then
    echo "Usage: $0 <archive.tar.gz> [output.run]"
    echo ""
    echo "Creates a self-extracting searchable archive."
    echo "The output file can be run directly to start the search server."
    exit 1
fi

TARBALL="$1"
OUTPUT="${2:-${TARBALL%.tar.gz}.run}"

if [ ! -f "$TARBALL" ]; then
    echo "Error: Tarball not found: $TARBALL"
    exit 1
fi

if [ ! -f "$BOOTSTRAP_C" ]; then
    echo "Error: bootstrap.c not found: $BOOTSTRAP_C"
    exit 1
fi

# Create temp directory
TMPDIR=$(mktemp -d)
trap "rm -rf $TMPDIR" EXIT

echo "Compiling bootstrap..."
gcc -O2 -o "$TMPDIR/bootstrap" "$BOOTSTRAP_C" -lz

BOOTSTRAP_SIZE=$(stat -c%s "$TMPDIR/bootstrap" 2>/dev/null || stat -f%z "$TMPDIR/bootstrap")
echo "Bootstrap size: $BOOTSTRAP_SIZE bytes"

echo "Creating self-extracting archive..."

# Concatenate: bootstrap + tarball + magic + offset
cat "$TMPDIR/bootstrap" "$TARBALL" > "$TMPDIR/combined"

# Append magic marker
echo -n "NEOPIG" >> "$TMPDIR/combined"

# Append offset as 16-char hex string
printf '%016x' "$BOOTSTRAP_SIZE" >> "$TMPDIR/combined"

# Make executable and move to output
chmod +x "$TMPDIR/combined"
mv "$TMPDIR/combined" "$OUTPUT"

FINAL_SIZE=$(stat -c%s "$OUTPUT" 2>/dev/null || stat -f%z "$OUTPUT")
echo ""
echo "Created: $OUTPUT ($FINAL_SIZE bytes)"
echo ""
echo "To run:"
echo "  ./$OUTPUT"
echo "  # Opens http://localhost:6543"