#! {{ bash_path }}

function increase_revision_number() {
  # this increase the revision number an ebuild
  # (except for revision number 9999 which is a value for "live ebuild", for dev revisions)
  # see https://devmanual.gentoo.org/general-concepts/ebuild-revisions/

  if [ -z "$1" ] ; then
    echo "ERROR: No parameter given to function: increase_revision_number."
    echo "Usage: increase_revision_number /path/to/dir/containing/ebuild"
    exit 1
  elif [ -d "$1" ]; then
    DIR="$1"
    CURRENT_FILE=""
    CURRENT_REVISION=0
    # get the biggest revision number
    # XXX: may break if there are many version of an ebuild
    # (eg: bash-4.3_p42-r4.ebuild and bash-3.7-r8.ebuild)
    for FILENAME in $(find "${DIR}" -maxdepth 1 -regextype sed -regex .*-r[0-9]*\.ebuild); do
      echo $FILENAME
      REVISION="$(echo ${FILENAME} | rev | cut -d- -f1 | rev | tr -d [:alpha:] | tr -d [:punct:])"
      echo "${REVISION}"
      if [ "$CURRENT_REVISION" -lt "$REVISION" ] ; then
          CURRENT_REVISION=${REVISION}
          CURRENT_FILE=${FILENAME}
      fi
    done
    if [ "$CURRENT_REVISION" -ne "9999" ]; then
      # increase REVISION
      NEW_REVISION=$((CURRENT_REVISION+1))
      NEW_FILE="$(echo ${CURRENT_FILE} | sed -r 's/-r'${CURRENT_REVISION}'/-r'${NEW_REVISION}'/')"
      echo "changing revision number: ${CURRENT_FILE} -> ${NEW_FILE}"
      mv "${CURRENT_FILE}" "${NEW_FILE}"
    fi
  fi
}

function insert_packages_into_ebuild() {
  # Insert packages (in form of "category/package") into RDEPEND part of ebuild.
  # Optionally increasing version of given ebuild.
  EBUILD=$1
  changed=0
  shift
  while [ ! -z "$1" ]
  do
    package=$1
    if [[ $( grep "${package}" "${EBUILD}" ) ]] ; then
      echo "no need to change ${EBUILD} file to add ${package}..." >> "${BUILD_LOG}"
    else
      printf "\n\nRDEPEND=\"\${RDEPEND}\n          ${package}\"\n">> ${EBUILD}
      changed=1
    fi
    shift
  done;

  if [ $changed -eq 1 ]
  then
    # if we inserted at least one package then increase the version to be sure
    # it gets selected in case of more overlays with the same package
    increase_revision_number $(dirname $EBUILD)
  fi
}

######################## Download of sources using the "repo" command ########################
DL_LOG="{{ instance_log_dir }}/cros_sources_dl.log"
BRANCH="{{ branch }}"
CHROMIUM_OVERLAY="{{ cros_location }}/{{ branch }}/src/third_party/chromiumos-overlay"
PORTAGE_STABLE="{{ cros_location }}/{{ branch }}/src/third_party/portage-stable"

{{ export_path_cmd }}
echo "getting Chromium OS sources..." >> $DL_LOG
echo "{{ cros_location }}/{{ branch }}"
install -d "{{ cros_location }}/{{ branch }}"
cd "{{ cros_location }}/{{ branch }}"

# git setup
if ! git config user.name || ! git config user.email ; then
  git config --global user.name "Your Name"
  git config --global user.email "you@example.com" 
fi

repo init -u https://chromium.googlesource.com/chromiumos/manifest.git -b {{ branch }} >> $DL_LOG || { echo "Problem while initiating Chromium OS repo (repo init). PATH is: '${PATH}'. Exiting." ; exit 1 ; }

# in case changes were already made, stash changes to be able to pull
cd ${CHROMIUM_OVERLAY}
git stash
cd ${PORTAGE_STABLE}
git stash

repo sync >> $DL_LOG || { echo "Problem while downloading Chromium OS sources (repo sync). Exiting." ; exit 1 ; }


############################## Prepare chroot environment ###################################
BUILD_LOG={{ instance_log_dir }}/cros_build.log
TEST_LOG={{ instance_log_dir }}/tests_nayuos_image.log
cd {{ cros_location }}/{{ branch }}

# create chroot environment (exit on failure)
cros_sdk --download || { echo "Problem while entering chroot or downloading chroot environment. PATH is: '${PATH}' Exiting." ; exit 1 ; }

# compile Python with sqlite support (-> change USE flag) for dev-lang/python
# it is needed by re6st
# just need to change -sqlite by sqlite on the right line
# same for IPv6 support
PACKAGE_USE_FILE="${CHROMIUM_OVERLAY}/profiles/targets/chromeos/package.use"
line_number=$(sed -n '/dev-lang\/python/=' ${PACKAGE_USE_FILE})
if [ $line_number ] ; then
    echo "$line_number"
    sed -i "${line_number}s/-sqlite/sqlite/" ${PACKAGE_USE_FILE}
    if [[ ! $(sed -n ${line_number}p ${PACKAGE_USE_FILE} | grep ipv6) ]]; then
        sed -i "${line_number}s/$/ ipv6/" ${PACKAGE_USE_FILE}
    fi
fi

# add some ebuilds, specific to NayuOS
for category in $( ls {{ ebuilds_dir }} ); do
  echo ${category}
  cp -R "{{ ebuilds_dir }}/${category}/"* "${CHROMIUM_OVERLAY}/${category}/"
done

install -m 770 "{{ scripts_dir }}/test_nayuos_image" "{{ cros_location }}/{{ branch }}/src/scripts/test_nayuos_image"

### packages management ###

# make virtual ebuild responsible for installing all packages dependent on NayuOS own packages
insert_packages_into_ebuild \
  ${CHROMIUM_OVERLAY}/virtual/target-chromium-os-dev/target-chromium-os-dev-1.ebuild \
  {{ nayu_dev_packages }}

# insert policies into /etc/chromium/policies/recommended with NayuOS customizations
insert_packages_into_ebuild \
  ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-dev-root/chromeos-dev-root-0.0.1.ebuild \
  {{ nayu_dev_rootfs_packages }}


# do not install the Upstart init script that starts ssh daemon at boot time
rm ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/files/openssh-server.conf
# strip away the src_install part because it only sets up booting scripts
sed -i -n '/src_install/q;p' ${CHROMIUM_OVERLAY}/chromeos-base/openssh-server-init/openssh-server-init-0.0.1.ebuild
sed -i -n '/src_install/q;p' ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/chromeos-sshd-init-0.0.1.ebuild
# increase version in case of other overlays with the same packages
increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/openssh-server-init/
increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/

# bashrc modifications
BASH_EBUILD_DIR="${PORTAGE_STABLE}/app-shells/bash"
if ! grep "BEGIN NayuOS configuration" "${BASH_EBUILD_DIR}/files/dot-bashrc" > /dev/null ; then
  cat >> "${BASH_EBUILD_DIR}/files/dot-bashrc" <<EOF

# ----- BEGIN NayuOS configuration -----

# use vim as default editor if nano does not exist
which nano &> /dev/null || export EDITOR=vim

# git quickfix for finding right git executables
export GIT_EXEC_PATH=/usr/local/libexec/git-core

# configure .gitconfig once
if [ ! -e ~/.gitconfig ] ; then
  which less &> /dev/null && git config --global core.pager less
fi

# go to ~/Download
[ "\$(pwd)" = / ] && cd ~/Downloads

alias ls='ls -CF --color=auto'
alias l='ls -lF'
alias lh='ls -hAl'
alias la='ls -la'
alias ll='ls -l'

tree() {
  python -Sc 'import sys, os
aa = sys.argv[1:] or ["."]
for a in aa:
  o = len(a.split(os.sep))
  for r, dd, ff in os.walk(a):
    dp = len(r.split(os.sep)) - o + 1
    print "%s- %s" % ((dp - 1) * "  ", os.path.basename(r))
    for f in ff:
      print "%s- %s" % (dp * "  ", f)' "\$@"
}

showzip() {
  [ \$# = 1 ] || { echo "Usage: showzip ZIPFILE" >&2 ; return 1 ; }
  python -Sc 'import sys, zipfile
zfile = zipfile.ZipFile(sys.argv[1])
zfile.printdir()
zfile.close()' "\$@"
}

zip() {
  [ \$# -gt 1 ] || { echo "Usage: zip ZIPFILE FILE..." >&2 ; return 1 ; }
  python -Sc 'import sys, zipfile, os
if os.path.lexists(sys.argv[1]):
  sys.stderr.write("zip: file %r already exists\n" % sys.argv[1])
  sys.exit(1)
zfile = zipfile.ZipFile(sys.argv[1], "w", zipfile.ZIP_DEFLATED)
def arc(arg):
  if os.path.islink(arg):
    sys.stderr.write("zip: symlink %r ignored\n" % arg)
  elif os.path.isdir(arg):
    for r, _, ff in os.walk(arg):
      zfile.write(r)
      for f in ff: arc(os.path.join(r, f))
  else:
    zfile.write(arg)
for arg in sys.argv[2:]: arc(arg)
zfile.close()' "\$@"
}

unzip() {
  [ \$# != 0 ] || { echo "Usage: unzip ZIPFILE [TARGET]" >&2 ; return 1 ; }
  python -Sc 'import sys, zipfile
zfile = zipfile.ZipFile(sys.argv[1])
zfile.extractall(sys.argv[2] if len(sys.argv) > 2 else ".")
zfile.close()' "\$@"
}

encmount() {
  if [ -z \$1 ] ; then
      echo "Please, give a device as parameter, ex: /dev/sda"
      return 1
  fi
  if  [ ! -d /media/removable/key ] ; then
      echo "New dir at /media/removable/key"
      sudo mkdir /media/removable/key
  fi
  echo "Mounting \$1 on /media/removable/key"
  sudo cryptsetup luksOpen \$1 key
  sudo mount -o noexec /dev/mapper/key /media/removable/key
}

__safewrite() {
  local cmd=safewrite
  local usage="Usage: \$cmd DST < stdin

Where DST is the destination file

Copy stdin to DST. Data is flushed regularly to avoid some eventual crash during cache sync.

Example:
  gunzip myimage.img.gz -c | sudosafewrite /dev/sda"

  local KiB=1024
  local MiB=\$((1024 * \$KiB))
  local bs=4096
  local count=\$((50 * \$MiB / \$bs))

  local infostep=50
  local infounit=MiB

  local safewrite_seek=0
  local safewrite_out=
  local safewrite_length=\$infostep

  [ \$# = 2 ] || { echo "\$usage" >&2 ; return 2 ; }
  [ \$1 != - ] || { echo "DST should not be '-'" >&2 ; return 2 ; }

  while [ \$? = 0 ] ; do
    echo "+ copying until \$safewrite_length \$infounit"
    safewrite_out=\$(\$1 bs=\$bs count=\$count seek=\$safewrite_seek of="\$2" 2>&1) || { echo "\$safewrite_out" ; return 1 ; }
    safewrite_length=\$((\$safewrite_length + \$infostep))
    safewrite_seek=\$((\$safewrite_seek + \$count))
    echo "\$safewrite_out"
    ! echo "\$safewrite_out" | grep '(0 B) copied' > /dev/null
  done
  return 0
}
safewrite() { __safewrite dd "\$@" ; }
sudodd() { sudo dd "\$@" ; }
sudosafewrite() { __safewrite sudodd "\$@" ; }

# ----- END NayuOS configuration -----
EOF
fi

increase_revision_number "${BASH_EBUILD_DIR}"

######################################## Build ##############################################
BOARDS="{{ boards_list }}"
KEEP_CACHE="{{ keep_cache }}"
for board in ${BOARDS} ; do
  echo ${board}
  if [ ${board} == daisy ] ; then
    # XXX: broken by sucessive wrapping
    echo "daisy board: accepting license for Mali drivers..."
    cros_sdk -- "sudo cp /etc/make.conf.user /etc/make.conf.user.save"
    cros_sdk -- "echo 'ACCEPT_LICENSE=\"*\"' | sudo tee --append /etc/make.conf.user"
  fi

  # preparing packages (for chroot and image)
  date >> "${BUILD_LOG}"
  echo "building packages for a ${board}-flavoured Chromium OS..." >> "${BUILD_LOG}"
  cros_sdk -- ./build_packages --board=${board} >> "${BUILD_LOG}"

  # change boot pictures
  cros_sdk -- cros_workon --board=${board} start chromiumos-assets
  cros_sdk -- cros_workon_make --board=${board} chromiumos-assets
  cros_sdk -- cros_workon_make --board=${board} chromiumos-assets --test
  cros_sdk -- cros_workon_make --board=${board} chromiumos-assets --install
  cp {{ logo_dir }}/* {{ cros_location }}/{{ branch }}/src/platform/chromiumos-assets/images_100_percent/
  cp {{ logo_dir }}/* {{ cros_location }}/{{ branch }}/src/platform/chromiumos-assets/images_200_percent/

  NAYU_IMAGE_LOCATION=/tmp/${board}.nayuos.img

  # rebuild packages with boot pictures
  cros_sdk -- ./build_packages --board=${board} >> "${BUILD_LOG}"

  # NayuOS images
  date >> "${BUILD_LOG}"
  echo "building image" >> "${BUILD_LOG}"
  cros_sdk -- ./build_image --board=${board} dev >> "${BUILD_LOG}" \
    && cros_sdk -- rm -f $NAYU_IMAGE_LOCATION && cros_sdk -- touch $NAYU_IMAGE_LOCATION \
    && cros_sdk -- cros flash --board=${board} file://$NAYU_IMAGE_LOCATION >> "${BUILD_LOG}" \
    && cros_sdk -- ./test_nayuos_image ${board} > "${TEST_LOG}" \
    || { echo "An error occured while building ${board} NayuOS image. Exiting." ; exit 1 ;}

  # save a lot of space on the server but delete cache and build files
  # (it means that the next build will be as long and use as much resources as this one)
  if [ ${KEEP_CACHE,,} == "no" ] ; then
    cros_sdk -- sudo rm -R "/var/cache/chromeos-chrome/chrome-src/src/out_${board}"
    cros_sdk -- sudo rm -R "/build/${board}"
  fi

  if [ ${board} == daisy ]; then
    # XXX: broken by sucessive wrapping
    echo "daisy board: removing accepted license for the next builds..."
    cros_sdk -- "sudo mv /etc/make.conf.user.save /etc/make.conf.user"
  fi
done

####################################### Post build ##########################################
# keep only the substring between - as current release number
RELEASE=$(echo ${BRANCH} | cut -d- -f2)
DIR_IMAGE_LOCATION={{ cros_location }}/images/${RELEASE}/$(date +'%F')
install ${DIR_IMAGE_LOCATION} -d
mv {{ cros_location }}/{{ branch }}/chroot/tmp/*.img ${DIR_IMAGE_LOCATION}

cd ${DIR_IMAGE_LOCATION}
for hashfunction in md5sum sha1sum sha256sum sha512sum; do
  echo ${hashfunction} >> hashes.txt
  ${hashfunction} *.img >> hashes.txt
  printf "\n\n" >> hashes.txt
done

for file in $(ls *.img); do
  gzip -9 ${file}
done

exit 0