#!/usr/bin/env bash
[[ " tar-from tar:from tar-in tar:in tar-build tar-build-locked help tar:help " == *" $1 "* ]] || exit $DOKKU_NOT_IMPLEMENTED_EXIT
set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"

case "$1" in
  tar-from|tar:from)
    verify_app_name "$2"
    APP=$2
    URL=$3
    shift 3
    curl -# --insecure -L "$URL" | dokku tar-in $APP "$@"
    ;;

  tar-in|tar:in)
    APP="$2"
    verify_app_name "$2"
    tee "$DOKKU_ROOT/$APP/src.tar" | wc -c
    plugn trigger receive-app $APP
    ;;

  tar-build)
    verify_app_name "$2"
    APP="$2"; APP_BUILD_LOCK="$DOKKU_ROOT/$APP/.build.lock"
    APP_BUILD_LOCK_MSG="$APP is currently being deployed or locked. Waiting..."
    [[ $(flock -n "$APP_BUILD_LOCK" true &>/dev/null ; echo $?) -ne 0 ]] && echo "$APP_BUILD_LOCK_MSG"

    shift 1
    flock -o "$APP_BUILD_LOCK" dokku tar-build-locked "$@"
    ;;

  tar-build-locked)
    APP="$2"
    verify_app_name "$2"
    shift 2

    # clean up after ourselves
    TMP_WORK_DIR=$(mktemp -d)
    trap 'rm -rf "$TMP_WORK_DIR" > /dev/null' RETURN

    # extract tar file
    chmod 755 $TMP_WORK_DIR
    pushd $TMP_WORK_DIR > /dev/null

    # Detect a common prefix that all files in the tar have, and strip off each directory found in it
    COMMON_PREFIX=$(tar -tf "$DOKKU_ROOT/$APP/src.tar" | sed -e 'N;s/^\(.*\).*\n\1.*$/\1\n\1/;D')
    BOGUS_PARTS=$(echo "$COMMON_PREFIX " | awk 'BEGIN{FS="/"} {print NF-1}')

    dokku_log_info1_quiet "Striping $BOGUS_PARTS worth of directories from tarball"

    tar -x -C "$TMP_WORK_DIR" -f "$DOKKU_ROOT/$APP/src.tar" --strip-components=$BOGUS_PARTS
    chmod -R u+r "$TMP_WORK_DIR"

    if [[ -f Dockerfile ]] && [[ "$([[ -f .env ]] && grep -q BUILDPACK_URL .env; echo $?)" != "0" ]] && [[ ! -f ".buildpacks" ]]; then
      dokku receive "$APP" "dockerfile" "$TMP_WORK_DIR" | sed -u "s/^/"$'\e[1G'"/"
    else
      dokku receive "$APP" "herokuish" "$TMP_WORK_DIR" | sed -u "s/^/"$'\e[1G'"/"
    fi
    ;;

  help | tar:help)
    cat && cat<<EOF
    tar:in <app>, Reads an tarball containing the app from stdin
    tar:from <app> <url>, Loads an app tarball from url.
EOF
    ;;

  *)
    exit $DOKKU_NOT_IMPLEMENTED_EXIT
    ;;

esac