#!/sbin/sh

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

exec_util() {
  LD_LIBRARY_PATH=$LD_PATH $UTILS $1
}

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

set_perm() {
  exec_util "chmod $1 $2"
}

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

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

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

SYSTEMASROOT=`getprop ro.build.system_root_image`

ui_print "Mounting system partition"

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

if [ "$SYSTEMASROOT" == "true" ]; then
  CURRENTSLOT=`getprop ro.boot.slot_suffix`
  if [ ! -z "$CURRENTSLOT" ]; then
    if [ "$CURRENTSLOT" == "_a" ]; then
      TARGETSYSTEM=/dev/block/bootdevice/by-name/system_a
    else
      TARGETSYSTEM=/dev/block/bootdevice/by-name/system_b
    fi
  else
    TARGETSYSTEM=/dev/block/bootdevice/by-name/system
  fi
  mkdir -p /system_root
  if mount -o rw $TARGETSYSTEM /system_root && mount /system_root/system /system; then
    ui_print "/system mounted"
  else
    ui_print "Could not mount /system! Aborting"
    exit 1
  fi
else
  if mount /system; then
    ui_print "/system mounted"
  else
    ui_print "Could not mount /system! Aborting"
    exit 1
  fi
fi

if [ -f /system/bin/toybox ]; then
  UTILS=/system/bin/toybox
  LD_PATH=/system/lib
else
  ui_print "Could not find /system/bin/toybox! Aborting"
  exit 1
fi

DIRS="addon.d app priv-app framework etc lib"

if [ -d /system/lib64 ]; then
  DIRS="$DIRS lib64"
  LD_PATH=/system/lib64
fi

LOWMEM=1572864
MEM=`grep MemTotal /proc/meminfo | awk '{ print $2 }'`
LOW_STORAGE=153600
STORAGE=`exec_util "df /system" | grep -v Filesystem | awk '{ print $4 }'`

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

if [ "$MEM" -lt "$LOWMEM" ] || [ "$STORAGE" -lt "$LOW_STORAGE" ]; then
  ui_print "Low resource device detected, removing large extras"
  exec_util "rm -rf priv-app/AndroidMigratePrebuilt"
  exec_util "rm -rf priv-app/SetupWizard"
  exec_util "rm -rf priv-app/Velvet"
fi
ui_print "Generating addon.d file"
cat addon.d/addond_head > addon.d/30-gapps.sh
for f in `exec_util "find . -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 dirs in $DIRS; do
  set_perm 0755 $dir
  for d in `exec_util "find ./$dir -type d"`; do
    set_perm 0755 $d
    set_owner root root $d
  done
  for f in `exec_util "find ./$dir -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
done
ui_print "Copying files"
exec_util "cp --preserve=a -r ./* /system/"
exec_util "rm -rf /system/priv-app/Provision/"
ui_print "Cleaning up files"
cd ../
exec_util "rm -rf system/"

ui_print "Unmounting system partition"
if umount -l /system; then
  if [ "$SYSTEMASROOT" == "true" ]; then
    umount -l /system_root
  fi
fi

ui_print "Done!"
exit 0