#!/usr/bin/env nux-runner

### Filesystem Layout manager
###
local STARTDIR=$(pwd)
local TEMPLATE_DIR=$NUX_ENV_DIR/templates
local SUFFIX=".nuxfs"
local TEMPLATE_FILTER="*$SUFFIX"

nux.include nuxfs
nux.include nuxfs.dsl

GIT_BIN=$(which git)
##  check - Verifies that directory matches nuxfs specification
function task.check {
	link.exists() {
		nux.log debug  "Testing '$1' as link"
		if test ! -h "$1"; then
			nuxfs.error "$1" "is not symlink."
			return
		fi
		local REAL_LINK=$(readlink "$1")
		local TARGET="$2";
		if test ! "$REAL_LINK" = "$TARGET"; then
			MAT_REAL=$(realpath "$REAL_LINK")
			local cdir=$(dirname "$1")
			MAT_TARGET=$(realpath "$cdir/$TARGET")
			if test "$MAT_REAL" = "$MAT_TARGET"; then
				nuxfs.warning "$1" "is using different definition for target '$2'"
			else
				nuxfs.error "$1" "links to $REAL_LINK instead of $TARGET"
				return
			fi
		fi
		if test ! -e "$1"; then
			nuxfs.warning "$1" "target '$NC_White$2$NC_No' does not exists."
		fi
	}
	git.exists() {
		nux.log debug "Testing '$1' as git repository"
		if test ! -e "$1/.git"; then
			nuxfs.error "$1" "is not git repository"
			return
		fi
		local remotes=$(grep "$2" "$1/.git/config" | wc -l)
		if [ $remotes -eq 0 ]; then
			nuxfs.error "$1" "Does not refer git remote '$2'"
			return;
		fi
	}
	def.notexists() {
		nuxfs.error "$1" "does not exists".
	}
	nuxfs.initcfg "$@"
	nuxfs.dsl.execute "$NUXFS_DEF" "$NUXFS_DEF_DIR" "$WORKDIR_ABSOLUTE"
}

##  apply - Creates missing files as described in nuxfs definition.
function task.apply {
	directory.notexists() {
		nuxfs.info "$1" "Created directory";
		mkdir -p "$1"

	}

	link.notexists() {
		nuxfs.info "$1" "Creating link to '$2'";
		ln -s "$2" "$1"
	}

	git.notexists() {
		local cur_dir=$(nuxfs.dir.get);
		local rel_path=$(realpath -Lms $1 --relative-to $cur_dir)
		pushd $(nuxfs.dir.get) > /dev/null;
		$GIT_BIN clone "$2" $rel_path
		popd > /dev/null;
	}

	nuxfs.initcfg "$@"
	nuxfs.dsl.execute "$NUXFS_DEF" "$NUXFS_DEF_DIR" "$WORKDIR_ABSOLUTE"
}

##  init - Initializes a directory using template
function task.init {
	if [ $# -eq 0 ]; then
		nux.log debug "No template specified. Creating empty $SUFFIX definition."
		touch .nuxfs
		return;
	fi
	local TEMPLATE=$1
	nux.log debug "User specified template is " $TEMPLATE
	if [ $(echo $TEMPLATE | grep -c "$SUFFIX\$") -eq 0 ]; then
		nux.log debug "Template is common template."
		TEMPLATE=$TEMPLATE_DIR/$TEMPLATE$SUFFIX
		if [ ! -e $TEMPLATE ]; then
			echo -n "Template '$1' does not exists. "
			nuxfs.template.list
			return;
		fi;

	fi;
	nux.log debug "Using '$TEMPLATE' to initialize."
	if [ ! -e $TEMPLATE ]; then
		echo "nuxfs template $1 does not exists."
		return;
	fi;
  local template_relative=$(realpath -Lms $TEMPLATE --relative-to $(pwd))
	nux.log debug "Creating link $SUFFIX:  target is '$template_relative'";
	ln -s "$template_relative" "$SUFFIX"
	nux.log debug "Invoking create task."
	task.create
}

##
##  template - List available templates
#
function task.template {
	nux.log debug $NUX_ENV_DIR

	nuxfs.template.list
}

function task.info {
	nuxfs.initcfg;
	if [ -n "$NUXFS_DEF" ]; then
		MANAGED_RELATIVE=$(realpath $NUXFS_DEF_DIR --relative-to $(pwd));

		if [ "$MANAGED_RELATIVE" = . ]; then
			echo $(pwd) is nuxfs managed directory.
		else
			echo $(pwd) is child of nuxfs managed directory.
			echo Managed directory is $NUXFS_DEF_DIR.
		fi;
  else
		echo "$(pwd) is not managed by nuxfs";

	fi;
}

function nuxfs.template.list {
	echo "Available templates:";
	pushd $TEMPLATE_DIR > /dev/null;
  for i in $TEMPLATE_FILTER; do
		local TEMPLATE_ID=$(basename $i $SUFFIX)
		echo -n "  $TEMPLATE_ID - " ;
		grep -m1 "^name " $i | sed -e "s/name *//"
		echo
	done;
	popd > /dev/null;
}


function nuxfs.initcfg {

	WORKDIR=$1;
	if [ -n "$WORKDIR" ]; then
		WORKDIR=$WORKDIR
  else
		WORKDIR=$(pwd);
	fi;

	nux.log debug Target: $WORKDIR

	NUXFS_DEF=$(nuxfs.closest $SUFFIX "$WORKDIR");

	if [ "$NUXFS_DEF" = "" ]; then
		nuxfs.error $(pwd) "No nuxfs configuration found."
		return;
	fi;
	NUXFS_DEF_DIR=$(dirname $NUXFS_DEF);
	WORKDIR_RELATIVE=$(realpath -ms "$WORKDIR" --relative-to "$NUXFS_DEF_DIR")
	WORKDIR_ABSOLUTE=$(realpath -ms "$WORKDIR")

}