#!/usr/bin/env bash

if [[ -z ${TOOLCHAIN+x} ]]; then
  echo TOOLCHAIN is not set. Please source activate
  exit 1
fi

function print_help() {
  cat << EOF
emul [-gvdh]

  Runs emulator

  -g
    Run with graphics window
    Can also be invoked by setting EMULGFX
  -v
    Run in vnc mode
    Can also be invoked by setting EMULVNC
    Open a listening client to port 5909 to connect
  -d
    DON'T run gdb debugger
    Can also be invoked by setting EMULNDEBUG
  -h
    Display help message
EOF
}

function main() {

  EMULGFX="${EMULGFX+x}"
  EMULVNC="${EMULVNC+x}"
  EMULNDEBUG="${EMULNDEBUG+x}"

  local monitorwin=""

  while getopts "gvdh" OPTION; do
    case ${OPTION} in
      g)
        readonly EMULGFX=1
        ;;
      v)
        readonly EMULVNC=1
        ;;
      d)
        readonly EMULNDEBUG=1
        ;;
      h)
        print_help
        exit 0
        ;;
    esac
  done

  [[ $1 = "--" ]] && shift
  EMULPARAM=("$@")

  make all || exit 1
  util/build_iso.sh || exit 1
  echo > serial.log
  emulator="qemu-system-x86_64 -cdrom mittos64.iso -serial file:serial.log -smp 4 ${EMULPARAM[@]}"
  debugger=$(which x86_64-elf-linux-gdb)

  if [[ (-n ${EMULVNC}) ]]; then
    # A bug in qemu means the reverse port does not work as written in the man pages
    # :X,reverse will open a reverse connection on DISPLAY X, not PORT X
    # i.e. PORT 5900+X
    emulator="${emulator} -vnc :9,reverse"
  fi

  if [[ (-n ${EMULVNC}) || (-n ${EMULGFX}) ]]; then
    emulator="${emulator} -monitor stdio"
  fi

  if [[ (-z ${EMULNDEBUG}) ]]; then
    emulator="${emulator} -s -S"
  fi

  if [[ (-z ${EMULVNC}) && (-z ${EMULGFX}) && (-n "${TMUX+x}") ]]; then
    emulator="${emulator} -curses"
  fi

  if [[ -n "${TMUX}" ]]; then
    emulwindow=`tmux new-window -P -n "osdevemul" "${emulator} 2>qemu-error.log; tmux kill-window -t osdevemul"`
    if [[ -z ${EMULNDEBUG} ]]; then
      debugpane=`tmux split-window -P -h -t ${emulwindow} "sleep 1; ${debugger}"`
    fi
    serialpane=`tmux split-window -P -v -t ${emulwindow} "tail -f serial.log | util/colorize.sh"`
    tmux select-pane -l
  else
    ${emulator}
  fi

}

main "${@}"