#!/bin/bash

# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2022-present Team LibreELEC (https://libreelec.tv)

do_install(){
  # create the persistent firmware dir
  mkdir -p "/storage/.config/firmware/edid"

  # capture the raw edid file
  if [ ! -e /storage/.config/firmware/edid/edid.bin ]; then
    cat "/sys/class/drm/card0-HDMI-A-1/edid" > "/storage/.config/firmware/edid/edid.bin"
  else
    echo "info: using existing edid.bin"
  fi

  # create the cpio file
  mkdir -p "/storage/cpio/lib/firmware/edid"
  cp "/storage/.config/firmware/edid/edid.bin" "/storage/cpio/lib/firmware/edid/"
  cd "/storage/cpio"
  find . -print | cpio -ov -H newc > "/storage/.config/firmware/edid/edid.cpio"

  # mount /flash rw
  mount -o remount,rw /flash

  # copy the cpio file
  cp "/storage/.config/firmware/edid/edid.cpio" "/flash/edid.cpio"

  # cleanup cpio dir
  rm -rf "/storage/cpio"

  # determine boot method and set params
  if [ -f "/flash/extlinux/extlinux.conf" ]; then
    FILE="/flash/extlinux/extlinux.conf"
    if grep -q "initrd=/edid.cpio" "${FILE}" ; then
      echo "error: ${FILE} already contains edid.cpio, aborting!"
      exit 1
    else
      cp "${FILE}" "${FILE}.backup"
      sed -i "/ APPEND/s/$/ drm.edid_firmware=edid\/edid.bin video=HDMI-A-1:D/" "${FILE}"
      echo "info: edid setup complete!"
      exit 0
    fi
  else
    FILE="/flash/uEnv.ini"
    if grep -q "initrd=/edid.cpio" "${FILE}" ; then
      echo "error: ${FILE} already contains edid.cpio info .. aborting!"
      exit 1
    else
      cp "${FILE}" "${FILE}.backup"
      sed -i "/ bootargs/s/$/ drm.edid_firmware=edid\/edid.bin video=HDMI-A-1:D/" "${FILE}"
      echo "info: edid setup complete!"
      exit 0
    fi
  fi
}

do_cleanup(){
  rm "/storage/.config/firmware/edid/edid.bin"
  rm "/storage/.config/firmware/edid/edid.cpio"
  mount -o remount,rw /flash
  rm "/flash/edid.cpio"
  if [ -f "/flash/extlinux/extlinux.conf" ]; then
    FILE="/flash/extlinux/extlinux.conf"
  else
    FILE="/flash/uEnv.ini"
  fi
  cp "${FILE}.backup" "${FILE}"
  mount -o remount,ro /flash
}

do_usage(){
  echo "usage: getedid {create|delete}"
  exit 0
}

case $1 in
  create)
    do_install
    ;;
  delete)
    do_cleanup
    ;;
  *)
    do_usage
    ;;
esac

exit