#!/bin/bash

# export BASH_DEBUG=true
module_load debug
module_load iecho

isFile() {
    if [[ -f $1 ]]
    then
        echo "true"
        return 0
    else
        return 1
    fi
}

                                                                                # env_file_pretty () {
  
# }

# https://www.baeldung.com/linux/envsubst-command
env_subs_file () {
 module_load helpers 
 local input; local fenv; local all
 [[ $1 == "-a" ]] && all=true && shift 1
 input=$1
 fenv=$2
 [[ ! $input ]] && iecho "nothing was passed to merge with environment" && return 1
 [[ -f "$input" ]] && input=$(cat "$input")
 [[ ! $(echo $input | grep -F "$") ]] && iecho "nothing to merge in $1" && return 2
 if [[ ($2 && ! -f $2) ]]; then
  iecho "no enviroment file at $2" && return 3
 else 
  # [[ $all ]] && export_file $fenv && unset fenv
  if [[ $all ]]; then
   fenv="/tmp/$USER/_tenvf" 
   # put quotes around values to avoid issues
   env | sed 's/\(=[[:blank:]]*\)\(.*\)/\1"\2"/' > $fenv 
   cat $2 | sed 's/\(=[[:blank:]]*\)\(.*\)/\1"\2"/' | sed 's/\s*=\s*/=/g'
   return
   cat "$2" | sed 's/\(=[[:blank:]]*\)\(.*\)/\1"\2"/' >> $fenv
  fi  
 fi
 if [[ $fenv ]]; then
    (set -a;source "$fenv" ;set +a; echo -e "$input" | envsubst "$(printf '${%s} ' $(cat "$fenv" | cut -d'=' -f1) )")  
  else
      echo -e "$input" | envsubst "$(printf '${%s} ' $(env | cut -d'=' -f1) )" 
 fi 
 [[ $all ]] && rm -f  $fenv
# [[ $all ]] && unset_file $2
}


#  shift 1
#  input=$1
#  set -a;. $2 ;set +a;
#  echo env file is now $2
#  fi

build_file () {
  # local file
  # echo build file $1 $2
  [[ $1 == "-f" ]] && file=true && shift 1
  [[ -f "$2" ]] || (iecho "output file $2 does not exist";return 1)
  if [[ -f "$1" ]]; then
  # echo $1
    [[ $file ]] && echo -e "\n####### ADDED $1 ########" >> $2
    # remove comment lines,  remove blank last line
    cat "$1" | sed '/^\s*#/d' | sed '/^$/{:a;N;s/\n$//;ta}' >> $2
  else iecho "no such file $1 to append"
  fi
}

function lines_2_str () {
  [[ ! -f "$1" ]] && return 1
  local str=''
  # echo the lines: $lines >&2
  # lines="$(cat "$1")"
  while read line; do
  [[ "$line" =~ ^[[:space:]]*# ]] && continue
    # echo line: "${line}" >&2
    str="$str ${line}"
   # echo str: $str >&2
done < $1
  # for line in $lines ; do
  #    str+='"'$line'" '
  # done
  echo $str
  # set +o noglob
  return 0
}

# find, superceeds find use `command find` to get the super
function _find () {
# USAGE
# all option arguments that contain globs/wildcards must be quoted to avoid expansion
# f sets path and file excludes from a supplied file path
# all lines ending in /  will be treated as directory names to ignore, otherwise files
# p option explictly excludes paths(directories)
# d option sets the directory depth which is current directy by default, 0 is all
# x excitly excludes file globs as a string
# n inclucdes only file globs otherwise it's all except .files
# if no directory is given it will attempt to source the present working directory
# example:
# source_dir -p "archive" -x '"*.off" "*.md"'  -d 0 # $DIR/$SUBDIR
local EXCLUDE_FILE
local PATHS
local NAMES
local ENAMES
local DEPTH=1
local HIDDEN

declare OPTION
declare OPTARG
declare OPTIND
while getopts 't:p:d:e:n:f:h' OPTION; do
case "$OPTION" in
  t)
    TYPE=$OPTARG
    # echo "TYPE $TYPE"
    ;;
  f)
    EXCLUDE_FILE=$OPTARG
    # echo EXCLUDE FILE $EXCLUDE_FILE >&2
    ;;
  p)
    # PATHS=("$OPTARG")
    IFS=',' read -r -a PATHS <<< "$OPTARG"
    # echo EXCLUDING THESE PATHS ${PATHS[*]}
    ;;
  e)
    IFS=',' read -r -a ENAMES <<< "${OPTARG}"
    # echo EXCLUDING THESE FILE NAMES ${ENAMES[*]}
    ;;
  n)
    # NAMES=("$OPTARG")
    IFS=',' read -r -a NAMES <<< "${OPTARG}"
    # NAMES=$OPTARG
    ;;
  d)
    DEPTH=$OPTARG
    # echo "SOURCING TO DEPTH (0=any)" "$DEPTH"
    ;;
  h)
    HIDDEN=true
    # echo "SOURCING TO DEPTH (0=any)" "$DEPTH"
    ;;
  *)
    echo unknown option $OPTION
    ;;
esac
done

shift $(( OPTIND - 1 ))

local DIR
DIR="$*"
if [ ! "$DIR" ]; then
  if [ -v PS1 ]; then
  echo no directory provided to search
  echo searching present working directory $(pwd)
  read -p "Do you want to continue? " -n 1 -r
  [[ $REPLY =~ ^[Yy]$ ]] && DIR=$(pwd) || return 1
  else
    return 1
  fi
fi

[ ! -d "$DIR" ] && echo " directory $DIR does not exist, aborting" && return 1

# echo dir $DIR

local FIND
FIND="command find $DIR"
FIND+=$([ ! $DEPTH == 0 ] && echo " -maxdepth $DEPTH ")
# FIND+=" -type $([ $TYPE ] && echo "$TYPE" || echo "f")"
TYPE=${TYPE:-f}
FIND+=" -type $TYPE "
# include HIDDEN files and directories IS FALSE BY DEFULT
[[ ! $HIDDEN ]] && FIND+="! -path \"*/.*/*\" ! -name \".*\" "

local name
local path

if [[ -f $EXCLUDE_FILE ]]; then
  local ignores=$(lines_2_str "$EXCLUDE_FILE")
  # echo ignores: $ignores >&2
  for exclude in $ignores ; do
    # echo exclude: ${exclude} >&2
    [[ "$exclude" == */ ]] && PATHS+=("${exclude::-1}") || ENAMES+=("$exclude")
  done
fi

# echo paths ${PATHS[@]} >&2
# echo exclude names ${ENAMES[@]} >&2

set -o noglob

if [[ ${PATHS[0]} ]]; then
  for path in ${PATHS[@]}; do
     # echo excluding $path
     FIND+=$(echo ' ! -path "*/'$path'/*"')
  done
fi

if [[ ${ENAMES[0]} ]]; then
  for name in ${ENAMES[@]}; do
     debug excluding name "$name"
     FIND+=$(echo ' ! -name '$name'')
  done
fi

debug "INCLUDING ONLY THESE FILE NAMES ${NAMES[*]}"
if [[ ${NAMES[0]} ]]; then
  for name in "${NAMES[@]}"; do
      debug only finding $name
     FIND+=$(echo " -name '${name}'")
  done
fi

# if [[ $NAMES ]]; then
#   debug names for find command $NAMES
#   for name in $NAMES; do
#       debug "xxonly finding '$name'"
#      FIND+=$(set -o noglob;echo " -name '${name}'")
#   done
# fi


# echo
# echo find dir: $DIR >&2
debug "find command: $FIND"
set +o noglob
local FILES
FILES=$(eval $FIND | sort)
[[ $FILES ]] && echo $FILES
return 0
}

source_dir () {
  # echo passed: $*
  debug function: source_dir
  local FILES
  FILES=$(_find "$@") # find function
  # echo $FILES >&2
  [[ $? -ne 0 ]] && return 1
    for f in $FILES; do
    # echo sourcing: $f >&2
    source "$f"
  done

}

prepend_file () {
# ---------------------------------------------------------------------------------------------------------------------- 
# usage prepend_file <somefile> <anotherfile>
# ---------------------------------------------------------------------------------------------------------------------- 
# Prepend the contents of <somefile> [$1], to <anotherfile> [$2], leaving the result in <anotherfile> [$2].
# insert a newline at the end of <somefile> [$1] if necessary
# ---------------------------------------------------------------------------------------------------------------------- 

# check # echo $1 $2
[[ -f $1 ]] || return 1
[[ -f $2 ]] || return 2 
# init
tmp_fn=$( mktemp -t TEMP_FILE_prepend.XXXXXXXX )
chmod 600 "$tmp_fn"
\cp $1 $tmp_fn
sed -i '$a\' $tmp_fn
cat $2 >> $tmp_fn
\mv "$tmp_fn" "$2"
# cleanup
rm -f "$tmp_fn"
return 0

# [End]
}