#!/bin/bash

# echo loading module library

# source with set -a and set +a  to have these bootstrap functions available in the environment 
module_confirm() {

local FILE
local DIR
local NAME
DIR=$1
NAME=$2

# TODO use file instead for valid extensions
# will look for valid module extensions and also look for duplicate modules with a directory which is not allowed
FILE="$($(which find) -L ${DIR} -type f -name "${NAME}.mod" -o -name "${NAME}".lib -o -name "${NAME}".func -o -name "${NAME}".sh -o -name "${NAME}".env)"
# echo files found $FILE
COUNT=0
if [ "$FILE" ]; then
  COUNT=$(echo $FILE | xargs -n 1 | wc -l)
fi
if [ $COUNT -gt 1 ]; then
  >&2 echo two or more modules of same name found, aborting
  >&2 echo $FILE | xargs -n 1
  return 1
fi
[[ $COUNT == 1 ]] && echo $FILE
}

# Returns path to module if succesful
module_find() {

[ ! $1 ] && >&2 echo "no module specified" && return 1

local MDIRS
local MDIR
local DIRS
local MODULE=$1

# MODULE_DIRS is array set in the environment and is an array of additional directories to 
# search for modules.  This makes is easy to include a custom module libraries outside
# the shell system.  These take precedence over any modules found in shell directories below.
# Precedence is first in list to last. 

# BASH_SHELL_DIRS holds shell directories to search for modules.  If will be searched
# in revsere order, user or network repos over host over base

DIRS=( ${BASH_SHELL_DIRS:-$BASH_SHELL_BASE} ${BASH_SHELL_NETWORKS_LOADED} )
[ -d BASH_SHELL_USER_DIR ] && DIRS=("${DIRS[@]}" "BASH_SHELL_USER_DIR")
[ -d $BASH_SHELL_DEV ] && DIRS=("${DIRS[@]}" "$BASH_SHELL_DEV")
# echo "before: ${DIRS[@]}";
DIRS=("${DIRS[@]/%/\/modules}")
DIRS=("${MODULE_DIRS[@]}" "${DIRS[@]}")
# echo "after: ${DIRS[@]}"

cnt=${#DIRS[@]}
for ((i=1;i<=cnt;i++)); do
    # find modules in reverse order so more specific ones override
    DIR="${DIRS[cnt-i]}"
    if [[ -d $DIR ]]; then 
    # echo $DIR $MODULE
    RES=$(module_confirm "$DIR" "$MODULE")
     [ $? -eq 0 ] && echo $RES && return 0
    fi 
  done
  >&2 echo no module found anywhere
  return 1
  
}

module_load() {
local module;local mpath  
[ ! $1 ] && >&2 echo "no module specified" && return 1
local FILE
for module in "$@"
do
# is there way to not reload modules??
#  if [[ $(eval "echo \"\$MODULE_$module_LOADED\"") ]]; then
#    echo $module already loaded
#  else
  eval "_${module}_ () { echo "$fname test"; }"
  mpath=$(module_find $module)
  [ $? -ne 0 ] && >&2 echo extreme warning: no module $1 found, so was not loaded
  source $mpath "$@"
#   eval "MODULE_$module_LOADED=true"
#  fi  
done
}

# put here so it's globally available
# runs a script but loads the current interactive shell environment, not recommended unless there is a need
# mostly for testing.  Better to source some part of the shell as needed using shell-process-directory module
shell_run () {
bash -ci ". ${1}"
}