#!/usr/bin/env bash

# Error codes:
# 1 Generic
# 2 TF2 not running

set -e

[[ ! -z "$SUDO_USER" ]] && RUNUSER="$SUDO_USER" || RUNUSER="$LOGNAME"

line=$(pgrep -u $RUNUSER hl2_linux || true)
arr=($line)

if [ $# == 1 ]; then
    proc=$1
else
    if [ ${#arr[@]} == 0 ]; then
        echo TF2 isn\'t running!
        exit 2
    fi
    proc=${arr[0]}
fi

echo Running instances: "${arr[@]}"
echo Attaching to "$proc"

#sudo ./detach $inst bin/libcathook.so

#if grep -q "$(realpath bin/libcathook.so)" /proc/"$proc"/maps; then
#  echo already loaded
#  exit
#fi

FILENAME="/tmp/.gl$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 6)"

cp "libcathook.so" "$FILENAME"

echo loading "$FILENAME" to "$proc"


gdbbin="gdb"
if ! [ -x "$(command -v gdb)" ]; then
  gdbbin="../gdb"
  chmod +x "$gdbbin"
fi

$gdbbin -n -q -batch \
    -ex "attach $proc" \
    -ex "set \$dlopen = (void*(*)(char*, int)) dlopen" \
    -ex "call \$dlopen(\"$FILENAME\", 1)" \
    -ex "call dlerror()" \
    -ex 'print (char *) $2' \
    -ex "detach" \
    -ex "quit"

rm $FILENAME