#! /usr/bin/env bash

#
# Script for build the image. Used builder script of the target repo
# Copyright (C) 2018 Copter Express Technologies
#
# Author: Artem Smirnov <urpylka@gmail.com>
#
# Distributed under MIT License (available at https://opensource.org/licenses/MIT).
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#

set -e # Exit immidiately on non-zero result

export DEBIAN_FRONTEND=${DEBIAN_FRONTEND:='noninteractive'}
export LANG=${LANG:='C.UTF-8'}
export LC_ALL=${LC_ALL:='C.UTF-8'}

export TARGET_REPO=${TARGET_REPO:='https://github.com/urpylka/clever.git'}
export TARGET_REF=${TARGET_REF:='master'}
export TARGET_CONFIG=${TARGET_CONFIG:='/.builder.json'}

echo "================================================================================"
echo "TARGET_REPO: $TARGET_REPO"
echo "TARGET_REF: $TARGET_REF"
echo "TARGET_CONFIG: $TARGET_CONFIG"
echo "================================================================================"

get_image() {
  # TEMPLATE: get_image <IMAGE_PATH> <RPI_DONWLOAD_URL> 
  local BUILD_DIR=$(dirname $1)
  local RPI_ZIP_NAME=$(basename $2)
  local RPI_IMAGE_NAME=$(echo ${RPI_ZIP_NAME} | sed 's/zip/img/')

  if [ ! -e "${BUILD_DIR}/${RPI_ZIP_NAME}" ]; then
    echo_stamp "Downloading original Linux distribution" \
    && wget -nv -O ${BUILD_DIR}/${RPI_ZIP_NAME} $2 \
    && echo_stamp "Downloading complete" "SUCCESS" \
    || (echo_stamp "Downloading was failed!" "ERROR"; exit 1)
  else; echo_stamp "Linux distribution already donwloaded"; fi

  echo_stamp "Unzipping Linux distribution image" \
  && unzip -p ${BUILD_DIR}/${RPI_ZIP_NAME} ${RPI_IMAGE_NAME} > $1 \
  && echo_stamp "Unzipping complete" "SUCCESS" \
  || (echo_stamp "Unzipping was failed!" "ERROR"; exit 1)
}

# TODO: The repository can be already downloaded, use the TARGET_REPO also as unix path.
REPO_DIR=$(mktemp -d --suffix=.builder_repo)
git clone ${TARGET_REPO} --single-branch --branch ${TARGET_REF} --depth 1 ${REPO_DIR} \
|| (echo 'Error: Could not clone repo!'; return 1)
[[ -f ${REPO_DIR}${TARGET_CONFIG} ]] && export TARGET_CONFIG=${REPO_DIR}${TARGET_CONFIG} \
|| (echo "Error: TARGET_CONFIG doesn't exist!"; return 1)

CUR_DIR="$(pwd)" && cd ${REPO_DIR}
TARGET_COMMIT=$(git show-ref --hash origin/master | cut -c1-7)
cd ${CUR_DIR} && unset CUR_DIR

export IMAGE_VERSION="${TARGET_REF}_${TARGET_COMMIT}"
export IMAGE_PATH="$(pwd)/image/$(basename -s '.git' ${TARGET_REPO})_${IMAGE_VERSION}.img"

get_image ${IMAGE_PATH} $(jq '.source_image' -r ${TARGET_CONFIG})

REGISTER=':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:'
if [[ $(arch) != 'armv7l' ]]; then
  mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc 2> /dev/null || true
  echo ${REGISTER} > /proc/sys/fs/binfmt_misc/register 2> /dev/null || true
  ./image-chroot.sh ${IMAGE_PATH} copy './qemu-arm-resin' '/usr/bin/qemu-arm-static'
fi

export IMAGE_BUILDER="$(dirname $(readlink -e "$0"))"
export SCRIPTS_DIR="${REPO_DIR}$(jq '.scripts_dir' -r ${TARGET_CONFIG})"

${REPO_DIR}$(jq '.main_script' -r ${TARGET_CONFIG})