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

: "${MANUAL:=""}"
: "${VERSION:="win11x64"}"

[[ "${VERSION,,}" == "11" ]] && VERSION="win11x64"
[[ "${VERSION,,}" == "win11" ]] && VERSION="win11x64"

[[ "${VERSION,,}" == "10" ]] && VERSION="win10x64"
[[ "${VERSION,,}" == "win10" ]] && VERSION="win10x64"

[[ "${VERSION,,}" == "8" ]] && VERSION="win81x64"
[[ "${VERSION,,}" == "81" ]] && VERSION="win81x64"
[[ "${VERSION,,}" == "8.1" ]] && VERSION="win81x64"
[[ "${VERSION,,}" == "win81" ]] && VERSION="win81x64"
[[ "${VERSION,,}" == "win8" ]] && VERSION="win81x64"

[[ "${VERSION,,}" == "22" ]] && VERSION="win2022-eval"
[[ "${VERSION,,}" == "2022" ]] && VERSION="win2022-eval"
[[ "${VERSION,,}" == "win22" ]] && VERSION="win2022-eval"
[[ "${VERSION,,}" == "win2022" ]] && VERSION="win2022-eval"

[[ "${VERSION,,}" == "19" ]] && VERSION="win2019-eval"
[[ "${VERSION,,}" == "2019" ]] && VERSION="win2019-eval"
[[ "${VERSION,,}" == "win19" ]] && VERSION="win2019-eval"
[[ "${VERSION,,}" == "win2019" ]] && VERSION="win2019-eval"

[[ "${VERSION,,}" == "16" ]] && VERSION="win2016-eval"
[[ "${VERSION,,}" == "2016" ]] && VERSION="win2016-eval"
[[ "${VERSION,,}" == "win16" ]] && VERSION="win2016-eval"
[[ "${VERSION,,}" == "win2016" ]] && VERSION="win2016-eval"

if [[ "${VERSION,,}" == "tiny10" ]]; then
  VERSION="https://archive.org/download/tiny-10-23-h2/tiny10%20x64%2023h2.iso"
fi

if [[ "${VERSION,,}" == "tiny11" ]]; then
  VERSION="https://archive.org/download/tiny-11-core-x-64-beta-1/tiny11%20core%20x64%20beta%201.iso"
fi

if [ -z "$MANUAL" ]; then

  MANUAL="N"
  [[ "${BASE,,}" == "tiny10"* ]] && MANUAL="Y"

fi

CUSTOM="custom.iso"

[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="Custom.iso"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="custom.ISO"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="CUSTOM.ISO"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="custom.img"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="Custom.img"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="custom.IMG"
[ ! -f "$STORAGE/$CUSTOM" ] && CUSTOM="CUSTOM.IMG"

MSG="Windows is being started, please wait..."

if [ -f "$STORAGE/$CUSTOM" ]; then

  EXTERNAL="Y"
  BASE="$CUSTOM"

else

  CUSTOM=""

  if [[ "${VERSION,,}" == "http"* ]]; then
    EXTERNAL="Y"
  else
    EXTERNAL="N"
  fi

  if [[ "$EXTERNAL" != [Yy1]* ]]; then

    BASE="$VERSION.iso"

    if [ ! -f "$STORAGE/$BASE" ]; then
      MSG="Windows is being downloaded, please wait..."
    fi

  else

    BASE=$(basename "${VERSION%%\?*}")
    : "${BASE//+/ }"; printf -v BASE '%b' "${_//%/\\x}"
    BASE=$(echo "$BASE" | sed -e 's/[^A-Za-z0-9._-]/_/g')

    if [ ! -f "$STORAGE/$BASE" ]; then
      MSG="Image '$BASE' is being downloaded, please wait..."
    fi

  fi

  [[ "${BASE,,}" == "custom."* ]] && BASE="windows.iso"

fi

html "$MSG"
TMP="$STORAGE/tmp"

if [ -f "$STORAGE/$BASE" ]; then

  # Check if the ISO was already processed by our script
  MAGIC=$(dd if="$STORAGE/$BASE" seek=0 bs=1 count=1 status=none | tr -d '\000')
  MAGIC="$(printf '%s' "$MAGIC" | od -A n -t x1 -v | tr -d ' \n')"

  if [[ "$MAGIC" == "16" ]]; then

    if [[ "$MANUAL" = [Yy1]* ]]; then
      rm -rf "$TMP"
      return 0
    fi

    FOUND="N"
    if [ -f "$STORAGE/data.img" ] || [ -f "$STORAGE/data.qcow2" ]; then
      FOUND="Y"
    else
      [ -b "${DEVICE:-}" ] && FOUND="Y"
    fi

    if [[ "$FOUND" == "Y" ]]; then
      rm -rf "$TMP"
      return 0
    fi

  fi

  EXTERNAL="Y"
  CUSTOM="$BASE"

fi

mkdir -p "$TMP"

if [ ! -f "$STORAGE/$CUSTOM" ]; then
  CUSTOM=""
  ISO="$TMP/$BASE"
else
  ISO="$STORAGE/$CUSTOM"
fi

rm -f "$TMP/$BASE"

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

  if [[ "$EXTERNAL" != [Yy1]* ]]; then

    cd "$TMP"
    /run/mido.sh "$VERSION"
    cd /run

  else

    info "Downloading $BASE as boot image..."

    # Check if running with interactive TTY or redirected to docker log
    if [ -t 1 ]; then
      PROGRESS="--progress=bar:noscroll"
    else
      PROGRESS="--progress=dot:giga"
    fi

    { wget "$VERSION" -O "$ISO" -q --no-check-certificate --show-progress "$PROGRESS"; rc=$?; } || :

    (( rc != 0 )) && error "Failed to download $VERSION, reason: $rc" && exit 60

  fi

  [ ! -f "$ISO" ] && error "Failed to download $VERSION" && exit 61

fi

SIZE=$(stat -c%s "$ISO")
SIZE_GB=$(( (SIZE + 1073741823)/1073741824 ))

if ((SIZE<10000000)); then
  error "Invalid ISO file: Size is smaller than 10 MB" && exit 62
fi

SPACE=$(df --output=avail -B 1 "$TMP" | tail -n 1)
SPACE_GB=$(( (SPACE + 1073741823)/1073741824 ))

if (( SIZE > SPACE )); then
  error "Not enough free space in $STORAGE, have $SPACE_GB GB available but need at least $SIZE_GB GB." && exit 63
fi

if [ -n "$CUSTOM" ]; then
  MSG="Extracting local ISO image..."
else
  MSG="Extracting downloaded ISO image..."
fi

info "$MSG" && html "$MSG"

DIR="$TMP/unpack"
rm -rf "$DIR"

7z x "$ISO" -o"$DIR" > /dev/null

FB="falling back to manual installation!"
ETFS="boot/etfsboot.com"
EFISYS="efi/microsoft/boot/efisys_noprompt.bin"

if [ ! -f "$DIR/$ETFS" ] || [ ! -f "$DIR/$EFISYS" ]; then

  if [ ! -f "$DIR/$ETFS" ]; then
    warn "failed to locate file 'etfsboot.com' in ISO image, $FB"
  else
    warn "failed to locate file 'efisys_noprompt.bin' in ISO image, $FB"
  fi

  # Mark ISO as prepared via magic byte
  printf '\x16' | dd of="$ISO" bs=1 seek=0 count=1 conv=notrunc status=none

  [[ "$ISO" != "$STORAGE/$BASE" ]] && mv -f "$ISO" "$STORAGE/$BASE"

  rm -f "$STORAGE/windows.ver"
  cp /run/version "$STORAGE/windows.ver"

  rm -rf "$TMP"
  return 0
fi

[ -z "$CUSTOM" ] && rm -f "$ISO"

XML=""

if [[ "$MANUAL" != [Yy1]* ]]; then

  if [[ "$EXTERNAL" != [Yy1]* ]]; then
    [ -z "$CUSTOM" ] && XML="$VERSION.xml"
  fi

  if [ ! -f "/run/assets/$XML" ]; then

    MSG="Detecting Windows version from ISO image..."
    info "$MSG" && html "$MSG"

    LOC="$DIR/sources/install.wim"
    [ ! -f "$LOC" ] && LOC="$DIR/sources/install.esd"

    if [ -f "$LOC" ]; then

      DETECTED=""
      TAG="DISPLAYNAME"
      RESULT=$(wimlib-imagex info -xml "$LOC" | tr -d '\000')
      NAME=$(sed -n "/$TAG/{s/.*<$TAG>\(.*\)<\/$TAG>.*/\1/;p}" <<< "$RESULT")

      [[ "${NAME,,}" == *"windows 11"* ]] && DETECTED="win11x64"
      [[ "${NAME,,}" == *"windows 10"* ]] && DETECTED="win10x64"
      [[ "${NAME,,}" == *"windows 8"* ]] && DETECTED="win81x64"
      [[ "${NAME,,}" == *"server 2022"* ]] && DETECTED="win2022-eval"
      [[ "${NAME,,}" == *"server 2019"* ]] && DETECTED="win2019-eval"
      [[ "${NAME,,}" == *"server 2016"* ]] && DETECTED="win2016-eval"

      if [ -z "$DETECTED" ]; then

        TAG="PRODUCTNAME"
        NAME2=$(sed -n "/$TAG/{s/.*<$TAG>\(.*\)<\/$TAG>.*/\1/;p}" <<< "$RESULT")
        [ -z "$NAME" ] && NAME="$NAME2"

        [[ "${NAME2,,}" == *"windows 11"* ]] && DETECTED="win11x64"
        [[ "${NAME2,,}" == *"windows 10"* ]] && DETECTED="win10x64"
        [[ "${NAME2,,}" == *"windows 8"* ]] && DETECTED="win81x64"
        [[ "${NAME2,,}" == *"server 2022"* ]] && DETECTED="win2022-eval"
        [[ "${NAME2,,}" == *"server 2019"* ]] && DETECTED="win2019-eval"
        [[ "${NAME2,,}" == *"server 2016"* ]] && DETECTED="win2016-eval"

      fi

      if [ -n "$DETECTED" ]; then

        XML="$DETECTED.xml"

        if [ -f "/run/assets/$XML" ]; then
          echo "Detected image of type '$DETECTED', which supports automatic installation."
        else
          XML=""
          warn "detected image of type '$DETECTED', but no matching XML file exists, $FB."
        fi

      else
        if [ -z "$NAME" ]; then
          warn "failed to detect Windows version from image, $FB"
        else
          if [[ "${NAME,,}" == "windows 7" ]]; then
            warn "detected Windows 7 image, $FB"
          else
            warn "failed to detect Windows version from string '$NAME', $FB"
          fi
        fi
      fi
    else
      warn "failed to locate 'install.wim' or 'install.esd' in ISO image, $FB"
    fi
  fi
fi

ASSET="/run/assets/$XML"

if [ -f "$ASSET" ]; then

  LOC="$DIR/autounattend.xml"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/Autounattend.xml"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/AutoUnattend.xml"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/autounattend.XML"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/Autounattend.XML"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/AutoUnattend.XML"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/AUTOUNATTEND.xml"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"
  LOC="$DIR/AUTOUNATTEND.XML"
  [ -f "$LOC" ] && mv -f "$ASSET" "$LOC"

  LOC="$DIR/sources/boot.wim"
  [ ! -f "$LOC" ] && LOC="$DIR/sources/boot.esd"

  if [ -f "$LOC" ]; then

    MSG="Adding XML file for automatic installation..."
    info "$MSG" && html "$MSG"

    RESULT=$(wimlib-imagex info -xml "$LOC" | tr -d '\000')

    if [[ "${RESULT^^}" == *"<IMAGE INDEX=\"2\">"* ]]; then
      INDEX="2"
    else
      INDEX="1"
    fi

    wimlib-imagex update "$LOC" "$INDEX" --command "add $ASSET /autounattend.xml" > /dev/null

  else

    ASSET=""
    warn "failed to locate 'boot.wim' or 'boot.esd' in ISO image, $FB"

  fi
fi

CAT="BOOT.CAT"
LABEL="${BASE%.*}"
LABEL="${LABEL::30}"
OUT="$TMP/$LABEL.tmp"
rm -f "$OUT"

SPACE=$(df --output=avail -B 1 "$TMP" | tail -n 1)
SPACE_GB=$(( (SPACE + 1073741823)/1073741824 ))

if (( SIZE > SPACE )); then
  error "Not enough free space in $STORAGE, have $SPACE_GB GB available but need at least $SIZE_GB GB." && exit 63
fi

MSG="Generating new ISO image for installation..."
info "$MSG" && html "$MSG"

genisoimage -b "$ETFS" -no-emul-boot -c "$CAT" -iso-level 4 -J -l -D -N -joliet-long -relaxed-filenames -quiet -V "$LABEL" -udf \
                       -boot-info-table -eltorito-alt-boot -eltorito-boot "$EFISYS" -no-emul-boot -o "$OUT" -allow-limited-size "$DIR"

# Mark ISO as prepared via magic byte
printf '\x16' | dd of="$OUT" bs=1 seek=0 count=1 conv=notrunc status=none

[ -n "$CUSTOM" ] && rm -f "$STORAGE/$CUSTOM"

if [ -f "$STORAGE/$BASE" ]; then
  error "File $STORAGE/$BASE does already exist ?!" && exit 64
fi

mv "$OUT" "$STORAGE/$BASE"

rm -f "$STORAGE/windows.ver"
cp /run/version "$STORAGE/windows.ver"

rm -rf "$TMP"

html "Successfully prepared image for installation..."

return 0