#!/usr/bin/env bash
set -Eeuo pipefail

# Docker environment variables
: "${BOOT_MODE:="macos"}"  # Boot mode
: "${SECURE:="off"}"       # Secure boot

BOOT_DESC=""
BOOT_OPTS=""
OVMF="/usr/share/OVMF"

case "${HEIGHT,,}" in
  "1080" )
    DEST="$PROCESS"
    ROM="OVMF_CODE.fd"
    VARS="OVMF_VARS-1920x1080.fd"
    ;;
  "768" )
    DEST="${PROCESS}_hd"
    ROM="OVMF_CODE.fd"
    VARS="OVMF_VARS-1024x768.fd"
    ;;
  *)
    ROM="OVMF_CODE.fd"
    VARS="OVMF_VARS.fd"
    DEST="${PROCESS}_${HEIGHT}"
    ;;
esac

BOOT_OPTS+=" -smbios type=2"
BOOT_OPTS+=" -rtc base=utc,base=localtime"
BOOT_OPTS+=" -global ICH9-LPC.disable_s3=1"
BOOT_OPTS+=" -global ICH9-LPC.disable_s4=1"
BOOT_OPTS+=" -global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off"

osk=$(echo "bheuneqjbexolgurfrjbeqfthneqrqcyrnfrqbagfgrny(p)NccyrPbzchgreVap" | tr 'A-Za-z' 'N-ZA-Mn-za-m')
BOOT_OPTS+=" -device isa-applesmc,osk=$osk"

# OVMF
DEST="$STORAGE/$DEST"

if [ ! -s "$DEST.rom" ] || [ ! -f "$DEST.rom" ]; then
  [ ! -s "$OVMF/$ROM" ] || [ ! -f "$OVMF/$ROM" ] && error "UEFI boot file ($OVMF/$ROM) not found!" && exit 44
  cp "$OVMF/$ROM" "$DEST.rom"
fi

if [ ! -s "$DEST.vars" ] || [ ! -f "$DEST.vars" ]; then
  [ ! -s "$OVMF/$VARS" ] || [ ! -f "$OVMF/$VARS" ]&& error "UEFI vars file ($OVMF/$VARS) not found!" && exit 45
  cp "$OVMF/$VARS" "$DEST.vars"
fi

BOOT_OPTS+=" -drive if=pflash,format=raw,readonly=on,file=$DEST.rom"
BOOT_OPTS+=" -drive if=pflash,format=raw,file=$DEST.vars"

IMG="$STORAGE/boot.img"

if [ ! -f "$IMG" ]; then

  FILE="OpenCore.img"
  IMG="/tmp/$FILE"
  rm -f "$IMG"

  # OpenCoreBoot
  ISO="/opencore.iso"
  OUT="/tmp/extract"

  rm -rf "$OUT"
  mkdir -p "$OUT"

  msg="Building boot image"
  info "$msg..." && html "$msg..."

  [ ! -f "$ISO" ] && gzip -dk "$ISO.gz"

  if [ ! -f "$ISO" ] || [ ! -s "$ISO" ]; then
    error "Could not find image file \"$ISO\"." && exit 10
  fi

  START=$(sfdisk -l "$ISO" | grep -i -m 1 "EFI System" | awk '{print $2}')
  mcopy -bspmQ -i "$ISO@@${START}S" ::EFI "$OUT"

  CFG="$OUT/EFI/OC/config.plist"

  PLIST="/assets/config.plist"
  [ -f "/config.plist" ] && PLIST="/config.plist"

  cp "$PLIST" "$CFG"

  ROM="${MAC//[^[:alnum:]]/}"
  ROM="${ROM,,}"
  BROM=$(echo "$ROM" | xxd -r -p | base64)
  RESOLUTION="${WIDTH}x${HEIGHT}@32"

  sed -r -i -e 's|<data>m7zhIYfl</data>|<data>'"${BROM}"'</data>|g' "$CFG"
  sed -r -i -e 's|<string>iMacPro1,1</string>|<string>'"${MODEL}"'</string>|g' "$CFG"
  sed -r -i -e 's|<string>C02TM2ZBHX87</string>|<string>'"${SN}"'</string>|g' "$CFG"
  sed -r -i -e 's|<string>C02717306J9JG361M</string>|<string>'"${MLB}"'</string>|g' "$CFG"
  sed -r -i -e 's|<string>1920x1080@32</string>|<string>'"${RESOLUTION}"'</string>|g' "$CFG"
  sed -r -i -e 's|<string>007076A6-F2A2-4461-BBE5-BAD019F8025A</string>|<string>'"${UUID}"'</string>|g' "$CFG"

  # Build image

  MB=256
  CLUSTER=4
  START=2048
  SECTOR=512
  FIRST_LBA=34

  SIZE=$(( MB*1024*1024 ))
  OFFSET=$(( START*SECTOR ))
  TOTAL=$(( SIZE-(FIRST_LBA*SECTOR) ))
  LAST_LBA=$(( TOTAL/SECTOR ))
  COUNT=$(( LAST_LBA-(START-1) ))

  if ! truncate -s "$SIZE" "$IMG"; then
    rm -f "$IMG"
    error "Could not allocate space to create image $IMG ." && exit 11
  fi

  PART="/tmp/partition.fdisk"

  {       echo "label: gpt"
          echo "label-id: 1ACB1E00-3B8F-4B2A-86A4-D99ED21DCAEB"
          echo "device: $FILE"
          echo "unit: sectors"
          echo "first-lba: $FIRST_LBA"
          echo "last-lba: $LAST_LBA"
          echo "sector-size: $SECTOR"
          echo ""
          echo "${FILE}1 : start=$START, size=$COUNT, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=05157F6E-0AE8-4D1A-BEA5-AC172453D02C, name=\"primary\""

  } > "$PART"

  sfdisk -q "$IMG" < "$PART"
  echo "drive c: file=\"$IMG\" partition=0 offset=$OFFSET" > /etc/mtools.conf

  mformat -F -M "$SECTOR" -c "$CLUSTER" -T "$COUNT" -v "EFI" "C:"
  mcopy -bspmQ "$OUT/EFI" "C:"

  rm -rf "$OUT"

  info ""
  info "Model: $MODEL"
  info "Rom: $ROM"
  info "Serial: $SN"
  info "Board: $MLB"
  info ""

fi

BOOT_DRIVE_ID="OpenCore"

DISK_OPTS+=" -device virtio-blk-pci,drive=${BOOT_DRIVE_ID},bus=pcie.0,addr=0x5,bootindex=$BOOT_INDEX"
DISK_OPTS+=" -drive file=$IMG,id=$BOOT_DRIVE_ID,format=raw,cache=unsafe,readonly=on,if=none"

CPU_VENDOR=$(lscpu | awk '/Vendor ID/{print $3}')
DEFAULT_FLAGS="vendor=GenuineIntel,vmware-cpuid-freq=on,-pdpe1gb"

if [[ "$CPU_VENDOR" != "GenuineIntel" ]] || [[ "${KVM:-}" == [Nn]* ]]; then
  [ -z "${CPU_MODEL:-}" ] && CPU_MODEL="Haswell-noTSX"
  DEFAULT_FLAGS+=",+pcid,+ssse3,+sse4.2,+popcnt,+avx,+avx2,+aes,+fma,+bmi1,+bmi2,+smep,+xsave,+xsavec,+xsaveopt,+xgetbv1,+movbe,+rdrand,check"
fi

if [ -z "${CPU_FLAGS:-}" ]; then
  CPU_FLAGS="$DEFAULT_FLAGS"
else
  CPU_FLAGS="$DEFAULT_FLAGS,$CPU_FLAGS"
fi

SM_BIOS=""
CLOCKSOURCE="tsc"
[[ "${ARCH,,}" == "arm64" ]] && CLOCKSOURCE="arch_sys_counter"
CLOCK="/sys/devices/system/clocksource/clocksource0/current_clocksource"

if [ ! -f "$CLOCK" ]; then
  warn "file \"$CLOCK\" cannot not found?"
else
  result=$(<"$CLOCK")
  result="${result//[![:print:]]/}"
  case "${result,,}" in
    "${CLOCKSOURCE,,}" ) ;;
    "kvm-clock" )
      if [[ "$CPU_VENDOR" != "GenuineIntel" ]] && [[ "${CPU_CORES,,}" == "2" ]]; then
        warn "Restricted processor to a single core because nested KVM virtualization was detected!"
        CPU_CORES="1"
      else
        warn "Nested KVM virtualization detected, this might cause issues running macOS!"
      fi ;;
    "hyperv_clocksource_tsc_page" ) info "Nested Hyper-V virtualization detected, this might cause issues running macOS!" ;;
    "hpet" ) warn "unsupported clock source detected: '$result'. Please set host clock source to '$CLOCKSOURCE', otherwise it will cause issues running macOS!" ;;
    *) warn "unexpected clock source detected: '$result'. Please set host clock source to '$CLOCKSOURCE', otherwise it will cause issues running macOS!" ;;
  esac
fi

case "$CPU_CORES" in
  "" | "0" | "3" ) CPU_CORES="2" ;;
  "5" ) CPU_CORES="4" ;;
  "9" ) CPU_CORES="8" ;;
esac

case "$CPU_CORES" in
  "1" | "2" | "4" | "8" ) SMP="$CPU_CORES,sockets=1,dies=1,cores=$CPU_CORES,threads=1" ;;
  "6" | "7" ) SMP="$CPU_CORES,sockets=3,dies=1,cores=2,threads=1" ;;
  "10" | "11" ) SMP="$CPU_CORES,sockets=5,dies=1,cores=2,threads=1" ;;
  "12" | "13" ) SMP="$CPU_CORES,sockets=3,dies=1,cores=4,threads=1" ;;
  "14" | "15" ) SMP="$CPU_CORES,sockets=7,dies=1,cores=2,threads=1" ;;
  "16" | "32" | "64" ) SMP="$CPU_CORES,sockets=1,dies=1,cores=$CPU_CORES,threads=1" ;;
  *)
    error "Invalid amount of CPU_CORES, value \"${CPU_CORES}\" is not a power of 2!" && exit 35
    ;;
esac

USB="nec-usb-xhci,id=xhci"
USB+=" -device usb-kbd,bus=xhci.0"
USB+=" -global nec-usb-xhci.msi=off"

return 0