#!/bin/bash

docker_image_build () {

local targets=(dev arm amd deploy private multi)
local verbose; local scripts_dir; local log_dir;
declare OPTION; declare OPTARG; declare OPTIND

SDIR=$(pwd)
BDIR=$(dirname "$(realpath "$BASH_SOURCE")")
export SDIR
export BDIR
pushd $BDIR > /dev/null

source $BDIR/lib/load.sh

case "$1" in
  try)
  shift 1
  popd > /dev/null || return 2
  try_container "$@"
  return $?
  ;;
  image_name)
  shift 1
  image_name "$@"
  return $?
  ;;
  tag)
  shift 1
  image_tag "$@"
  return $?
  ;;
  push)
  shift 1
  image_push "$@"
  return $?
  ;;
  info)
  shift 1
  [[ $1 == "arch" ]] && { shift 1; image_arch "$@"; return $?; }
  [[ $1 == "exists" ]] && { shift 1; image_exists "$@"; return $?; }
  [[ $1 == "id" ]] && { shift 1; image_id "$@"; return $?; }
  image_info "$@"; return $?
  ;;
esac

exit_abnormal() {                         # Function: Exit with error.
  usage
  return ${1:-1}
}

scripts_dir=$SDIR/src
# TODO allow log directory option
log_dir=$SDIR/logs
mkdir -p $log_dir
[[ -z "$PS1" ]] || no_prompt=true
overwrite=true
target=dev

while getopts 'g:e:b:d:t:ncr:u:pxhs:w:akvoi' OPTION; do
  # echo processing: option:$OPTION argument:$OPTARG index:$OPTIND remaining:${@:$OPTIND}
  case "$OPTION" in
  e)
    local efile=$SDIR/$OPTARG 
    if [[ -f $efile ]]; then
      source "$efile" 
      [[ ! $? -eq 0 ]] && echo source of $efile  failed, exiting && return 2
     else
      echo no environment file at $efile, exiting
     return 2
    fi
    echo "----------"
    echo loaded environment filen $efile
    cat $efile
    echo "----------"
  ;;  
  o)
    unset overwrite
  ;;
  v)
    verbose=true
  ;;
  a)
  # automated - script is to be run without prompt (non-interactive)
    no_prompt=true
  ;;
  k)
  # keep the build scripts in the image, by default they are removed
    KEEP=true
  ;;
  w)
  # the work directory to put the build scripts in container (default is /opt/build)
    BUILD_DIR=$OPTARG
    ;;
  b)
  # CUSTOM BASE IMAGE
    BASE_IMAGE=$OPTARG
    ;;
  s)
    # scripts subdirectory from which to bind to scripts/, default is src/
    if isAbsPath $OPTARG; then
      scripts_dir=$OPTARG
     elif [ "$OPTARG" == "_base_" ]; then
       scripts_dir=$BDIR/src
      else
       scripts_dir=$SDIR/$OPTARG
      fi 
    ;;    
  d)
    # LINUX_DISTRO=$OPTARG
    LINUX_DISTRO=$OPTARG
    ;;
  x)
  #  Exclude distro from image name
    exclude_distro=true
    ;;
  t)
    target=$OPTARG
    ;;
  g)
    TAG=$OPTARG
    ;;
  u)
    RUSER=$OPTARG
    ;;
  c)
    try=true
      ;;
  p)
    push=true
      ;;
  n) 
    nocache="--no-cache" 
  ;;
  r)  
    REPO=$OPTARG
  ;;  
  h)  
    exit_abnormal 0
    return 0
  ;;
  *)  
      echo "unknown $0 option -$OPTARG"
      exit_abnormal 4
  ;;
  esac
done

shift $((OPTIND - 1))

if [[ ! -d $scripts_dir ]]; then
  if [[ ! $no_prompt ]]; then
    echo -e "\e[1;31mWARNING: build scripts directory$scripts_dir does not exist.\e[1;37m"
    echo "Do you want to use the base scripts" 
    read  -n 1 -p "directory at $BDIR/src? to continue [y]=>" REPLY
    [[ $REPLY != "y" ]] && echo -e "\n" && return 0
    echo 
  fi
  echo -e "\e[1;31mscripts directory $scripts_dir was not found using base build scripts at $BDIR/src\e[1;37m"  
  scripts_dir=$BDIR/src   
fi

[[ ! "${targets[@]}" =~ $target ]] && echo $target is not a valid target && echo valid targets are: ${targets[@]} && exit 4

LINUX_DISTRO=${LINUX_DISTRO:-alpine}

if [[ $BASE_IMAGE ]]; then
echo determining DISTRO of base image: $BASE_IMAGE
LINUX_DISTRO=$(get_distro -d $BASE_IMAGE)
 [[ ! $LINUX_DISTRO ]] && echo "unable to get base image OS for: $BASE_IMAGE, aborting build" && exit 1
 echo $BASE_IMAGE is built from distro $LINUX_DISTRO
 else 
 BASE_IMAGE=$LINUX_DISTRO
fi

name=$1
RUSER=${2:-$RUSER}

IMAGE_NAME=$([[ $RUSER ]] && echo ${RUSER}/)${name}$([[ ! $exclude_distro ]] && echo -${LINUX_DISTRO})
# TODO writing to existing tag untags existing image so write a new tag to that image then continue

# retag existing image and remove former tag
if [[ $(image_exists $IMAGE_NAME) ]]; then
  if [[ $overwrite ]]; then
    image_delete $IMAGE_NAME 
  else 
    newtag=$(date +'%d%H%M%S')
    echo image exists retaging $(image_name $IMAGE_NAME) with tag :$newtag  
    image_tag $IMAGE_NAME $IMAGE_NAME:$newtag
    image_tag -r $IMAGE_NAME
  fi 
fi  

# BASE_IMAGE=$([[ $BASE_IMAGE == *:* ]] && echo $BASE_IMAGE || echo $BASE_IMAGE:latest)
#$([[ ! $BASE_IMAGE == *:* ]] && echo :latest)

export BASE_IMAGE
export TAG
export IMAGE_NAME
export LINUX_DISTRO
export BUILD_DIR
export KEEP
export SYSADMIN_PW
export BUST_INIT_CACHE

echo "******************************************"
echo "Building with base image: $BASE_IMAGE"
echo "Outputing to image name => $IMAGE_NAME<-arch>:${TAG:-latest}"
echo "Linux Distro: $LINUX_DISTRO"
echo "Using build target: $target"
echo "Build Command: docker buildx --builder ${builder} bake ${nocache} ${target}"
if [[ $verbose ]]; then
  echo -e "\n---------------------------------"
  docker buildx bake --print $target
  echo -e "\n---------------------------------" 
  echo "build scripts at $scripts_dir to be copied to ${BUILD_DIR:-/build} in container ***** "
  ls -la $scripts_dir
  echo -e "\n----- base init script  init.sh ------"
  cat $scripts_dir/init.sh
  echo -e "\n---------------------------------"
fi
echo -e "\n***************************************"

if [[ ! $no_prompt ]]; then
  read  -n 1 -p "do you want to continue [y]=>" REPLY
  [[ $REPLY != "y" ]] && echo -e "\n" && exit 0
fi

builder=default
if [ $target == "deploy" ]; then 
    builder=deploy 
    if ! docker buildx ls | grep -q deploy ; then
        echo multiarch deploy builder does not exist, creating with docker-container driver 
        docker buildx create --name deploy --driver docker-container >/dev/null
        docker buildx ls | grep deploy
    fi
fi

[[ $target == "private" && ! $REPO ]] && echo "must use '-r <private repo>' if building to private repo" && exit 3 

# copy  source directory to temporary .src/ subdirectory
# MUST either be readable by all or group readable by docker group
rm -rf $BDIR/.src
rsync -aAru ${scripts_dir:-src}/ $BDIR/.src
ls -la $BDIR/.src

docker buildx --builder ${builder} bake ${nocache} ${target}  2>&1 | tee "$log_dir/${IMAGE_NAME//\//-}build.log"
[[ $? == 0 ]] && echo succcess building image $IMAGE_NAME || exit_abnormal 1  

rm -rf $BDIR/.src

# if [[ $target == "private" ]]; then 
#     ./push -a -r $REPO $IMAGE_NAME
#     ./push -r $REPO $IMAGE_NAME
#   else 
#     if [[ $push && (! $target == "dev")  ]];then 
#       echo pushing now
#       ./push $([[ $target == "arm" ]] && echo -a) -r $REPO $IMAGE_NAME
#     fi
# fi

popd > /dev/null

if [[ ($try || $target == "dev") ]] && [[ ! $no_prompt ]]; then
 echo trying newly built image in a container
 try_container -m opt $([[ $target == "deploy" ]] && echo -p) $IMAGE_NAME
fi 

#echo reset to calling directory $PWD

}

# if script was executed then call the function
(return 0 2>/dev/null) || docker_image_build $@