#!/usr/bin/env nux-runner

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

nux.use nux.dsl
nux.use nuxfs

GIT_BIN=$(which git)

nux.fs.dsl() {
  .block dir
  .keyword link
  .keyword git
  .keyword origin
  .keyword name
  .keyword template

  sdir() {
    dir "$@"
    enddir
  }

  .preprocess() {
    abs_path=$NUXFS_DEF_DIR/$path;
    rel_path=$(realpath -m -s "$abs_path" --relative-base="$WORKDIR");
  }

  .check() {
    nux.check.file.exists "$abs_path"
  }

  .check.failed() {
    nux.dsl.error "$rel_path" does not exists.
  }
}

task.check() {
  link.entered() {
    nux.log debug  "Testing '$rel_path' as link"
		if test ! -h "$abs_path"; then
			nuxfs.error "$rel_path" "is not symlink."
			return
		fi
		local REAL_LINK=$(readlink "$abs_path")
		local TARGET="$3";
		if test ! "$REAL_LINK" = "$TARGET"; then
			MAT_REAL=$(realpath "$REAL_LINK")
			local cdir=$(dirname "$abs_path")
			MAT_TARGET=$(realpath "$cdir/$TARGET")
			if test "$MAT_REAL" = "$MAT_TARGET"; then
				nuxfs.warning "$rel_path" "is using different definition for target '$3'"
			else
				nuxfs.error "$rel_path" "links to $REAL_LINK instead of $TARGET"
				return
			fi
		fi
		if test ! -e "$1"; then
			nuxfs.warning "$rel_path" "target '$NC_White$2$NC_No' does not exists."
		fi
  }
  git.entered() {
		nux.log debug "Testing '$rel_path' as git repository"
		if test ! -e "$1/.git"; then
			nuxfs.error "$rel_path" "is not git repository"
			return
		fi
		local remotes=$(grep "$3" "$rel_path/.git/config" | wc -l)
		if [ $remotes -eq 0 ]; then
			nuxfs.error "$rel_path" "Does not refer git remote '$3'"
			return;
		fi
	}
  process "$@";
}

##  apply - Creates missing files as described in nuxfs definition.
task.apply() {
    dir.check.recover() {
      nuxfs.info "$rel_path" "Created directory";
      mkdir -p "$abs_path"
    }
    link.check.recover() {
      nuxfs.info "$rel_path" "Creating link to '$3'";
      ln -s "$3" "$abs_path"
    }
    git.check.recover() {
      $GIT_BIN clone "$3" "$abs_path"
    }
  process "$@";
}

nux.dsl.load nux.fs.dsl

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

	nux.log debug Target: $TARGET

	NUXFS_DEF=$(nuxfs.closest $SUFFIX "$TARGET");
#
	if [ "$NUXFS_DEF" = "" ]; then
		nuxfs.error $(pwd) "No nuxfs configuration found."
		exit 1;
	fi
	NUXFS_DEF_DIR=$(dirname $NUXFS_DEF);
	TARGET_RELATIVE=$(realpath -ms "$TARGET" --relative-to "$NUXFS_DEF_DIR")
	TARGET_ABSOLUTE=$(realpath -ms "$TARGET")
  if [ "$TARGET_RELATIVE" != . ]; then
     if [[ $$TARGET_RELATIVE != ./* ]]; then
      TARGET_RELATIVE="./$TARGET_RELATIVE"
    fi
    nux.dsl.only.subtree "$TARGET_RELATIVE"
  fi

  nux.log debug nuxfs definition: $NC_White$NUXFS_DEF$NC_No
  nux.log debug $NC_White"target directory:$Nc_No"
  nux.log debug "   relative to def:" $NC_White$TARGET_RELATIVE$NC_No
  nux.log debug "   absoulte path:  " $NC_White$TARGET_ABSOLUTE$NC_No

  if test -e "$NUXFS_DEF"; then
  #    #NUXFS_TARGET_FOUND=0;
    source "$NUXFS_DEF";

  #    #if [ $NUXFS_TARGET_FOUND = 0 ]; then
  #    #  nuxfs.warning "$3" "Does not have definition in $DEF";
  #   fi
  else
    nuxfs.error "$NUXFS_DEF"  Definition file does not exists.
  fi
}

##  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.dsl.capture.dir {
  local CDIR=$1;
	local LEVEL=$2;
	nux.log debug "Inspecting directory $CDIR";

	if [ -e "$RELATIVE/$SUFFIX" ]; then
		return;
	fi;

	pushd "$CDIR" > /dev/null;
	for file in ./* ; do
		nuxfs.dsl.capture.file "$file" ".";
	done;
	popd > /dev/null;
}

function nuxfs.dsl.capture.file {
	local file=$1;
	local pdir=$2;
	local RELATIVE=$(realpath -ms "$file" --relative-to "$pdir");
	local ADDARGS="";
	local TYPE="";
	nux.log debug "Inspecting $file , Relative path is $RELATIVE";
	if [ -h "$RELATIVE" ]; then
		TYPE="link";
		ADDARGS="\"$(readlink "$RELATIVE")\""
	elif [ -d "$RELATIVE" -a -d "$RELATIVE/.git" ]; then
		TYPE=git;
		pushd "$RELATIVE" > /dev/null;
		ADDARGS="\"$($GIT_BIN remote get-url origin)\""
		popd  > /dev/null;
	elif [ -d "$RELATIVE" ]; then
		TYPE="dir";
	fi;

	if [ "$TYPE" ]; then
		echo  -e "${LEVEL}$TYPE \"$RELATIVE\" $ADDARGS";
	fi;

	if [ "$TYPE" = "dir" -a "$LEVEL" != "      " ]; then
		nuxfs.dsl.capture.dir "$RELATIVE" "${LEVEL}  "
		echo "${LEVEL}enddir";
	fi;
}

## capture - Captures current directory to nuxfs syntax
function task.capture {
	if [ $# -eq 0 ]; then
		nuxfs.dsl.capture.dir .

	else
		for file in "$@" ; do
			nuxfs.dsl.capture.file "$file" .;
		done;
	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")

}