#!/sbin/sh

OUTFD="/proc/self/fd/$2"
ZIP=$3

set_con() {
  chcon -h u:object_r:"$1":s0 $2
  chcon u:object_r:"$1":s0 $2
}

set_perm() {
  chmod $1 $2
}

set_owner() {
  chown $1:$2 $3
}

ui_print() {
  echo "ui_print $1" > "$OUTFD";
  echo "ui_print" > "$OUTFD";
}

cleanup() {
  ui_print "Cleaning up files"
  cd ../
  rm -rf system
  rm -rf bin
  rm toybox

  ui_print "Unmounting partitions"
  umount -l "$SYSTEM_MNT"
}

error_no_space() {
  ui_print "Not enough space for GApps! Aborting"
  cleanup
  exit 1
}

get_block_for_mount_point() {
  grep -v "^#" /etc/recovery.fstab | grep " $1 " | tail -n1 | tr -s ' ' | cut -d' ' -f1
}

find_block() {
  local name="$1"
  local fstab_entry=$(get_block_for_mount_point "/$name")
  # P-SAR hacks
  [ -z "$fstab_entry" ] && [ "$name" = "system" ] && fstab_entry=$(get_block_for_mount_point "/")
  [ -z "$fstab_entry" ] && [ "$name" = "system" ] && fstab_entry=$(get_block_for_mount_point "/system_root")

  local dev
  if [ "$DYNAMIC_PARTITIONS" = "true" ]; then
    if [ -n "$fstab_entry" ]; then
      dev="${BLK_PATH}/${fstab_entry}${SLOT_SUFFIX}"
    else
      dev="${BLK_PATH}/${name}${SLOT_SUFFIX}"
    fi
  else
    if [ -n "$fstab_entry" ]; then
      dev="${fstab_entry}${SLOT_SUFFIX}"
    else
      dev="${BLK_PATH}/${name}${SLOT_SUFFIX}"
    fi
  fi

  if [ -b "$dev" ]; then
    echo "$dev"
  fi
}

compute_apps_size() {
  NEEDED_STORAGE_SYSTEM=$(expr $(du -cs `find -maxdepth 1 -mindepth 1` | tail -n1 | cut -f1) + $STORAGE_BUFFER)
  RECLAIMABLE_STORAGE_SYSTEM=$(find . -type f | sed "s|^./|$SYSTEM_OUT/|" | xargs ls -d 2>/dev/null | xargs du -cs PLACEHOLDER 2>/dev/null | tail -n1 |  cut -f1)
  NEEDED_STORAGE_SYSTEM=$(expr $NEEDED_STORAGE_SYSTEM - $RECLAIMABLE_STORAGE_SYSTEM)
}

remove_big_optional_apps() {
  ui_print "Low resource device detected, removing large extras"
  rm -rf app/MarkupGoogle
  rm -rf priv-app/AndroidMigratePrebuilt
  rm -rf priv-app/SetupWizardPrebuilt
  rm -rf priv-app/Velvet
}

ui_print "**********************"
ui_print "MindTheGapps installer"
ui_print "**********************"

ui_print "Extracting files"
TMP=/tmp
cd "$TMP"
unzip -o "$ZIP"
rm -rf META-INF

ui_print "Setting up environment"
TOYBOX="${TMP}/toybox"
chmod +x "$TOYBOX"

TOYS_PATH="${TMP}/bin"
rm -rf "$TOYS_PATH";
$TOYBOX install -d "$TOYS_PATH"
for toy in $($TOYBOX); do
  $TOYBOX ln -sf "$TOYBOX" "${TOYS_PATH}/${toy}"
done
PATH="${TOYS_PATH}:${PATH}"

ui_print "Mounting partitions"

# Ensure system is unmounted so mounting succeeds
umount /system || umount /mnt/system || true

# Find partitions
DYNAMIC_PARTITIONS=`getprop ro.boot.dynamic_partitions`
if [ "$DYNAMIC_PARTITIONS" = "true" ]; then
    BLK_PATH="/dev/block/mapper"
else
    BLK_PATH=/dev/block/bootdevice/by-name
fi

CURRENTSLOT=`getprop ro.boot.slot_suffix`
if [ ! -z "$CURRENTSLOT" ]; then
  if [ "$CURRENTSLOT" == "_a" ]; then
    SLOT_SUFFIX="_a"
  else
    SLOT_SUFFIX="_b"
  fi
fi

SYSTEM_BLOCK=$(find_block "system")

# Disable rw protection on dynamic partitions
if [ "$DYNAMIC_PARTITIONS" = "true" ]; then
  blockdev --setrw "$SYSTEM_BLOCK"
fi

# Mount and define SYSTEM_OUT
SYSTEM_MNT=/mnt/system
mkdir -p "$SYSTEM_MNT" || true
if mount -o rw "$SYSTEM_BLOCK" "$SYSTEM_MNT"; then
ui_print "$SYSTEM_MNT mounted"
else
ui_print "Could not mount $SYSTEM_MNT! Aborting"
exit 1
fi
SYSTEM_OUT="${SYSTEM_MNT}/system"

# Compute storage requirements
SYSTEM_STORAGE=`df $SYSTEM_MNT | tail -1 | tr -s ' ' | cut -d ' ' -f4`
STORAGE_BUFFER=10240

cd system
compute_apps_size

if [ "$SYSTEM_STORAGE" -lt "$NEEDED_STORAGE_SYSTEM" ]; then
  remove_big_optional_apps
  compute_apps_size
  if [ "$SYSTEM_STORAGE" -lt "$NEEDED_STORAGE_SYSTEM" ]; then
    error_no_space
  fi
fi

ui_print "Generating addon.d file"
cat addon.d/addond_head > addon.d/30-gapps.sh
for f in `find . ! -path "./addon.d/*" -type f`; do
  line=$(echo "$f" | sed 's/\.\///')
  echo "$line" >> addon.d/30-gapps.sh
done
cat addon.d/addond_tail >> addon.d/30-gapps.sh
rm addon.d/addond_head addon.d/addond_tail

ui_print "Preparing files for copying"
for d in `find . -mindepth 1 -type d -type d`; do
  set_perm 0755 $d
  set_owner root root $d
done
for f in `find . -type f`; do
  type=$(echo "$f" | sed 's/.*\.//')
  if [ "$type" == "sh" ] || [ "$type" == "$f" ]; then
    set_perm 0755 $f
  else
    set_perm 0644 $f
  fi
  set_owner root root $f
  set_con system_file $f
done

ui_print "Copying files"
cp --preserve=a -r ./* "${SYSTEM_OUT}/"
if [ -e priv-app/SetupWizardPrebuilt ] ; then
  rm -rf "${SYSTEM_OUT}/priv-app/Provision"
fi

cleanup

ui_print "Done!"
exit 0