#!/bin/bash
#Manages an /etc/changelog

# %CONFIG% This comment is used to build custom scripts 

CHANGELOG=/etc/changelog

[[ -w /etc/changelog ]] || {
    echo -e "\nYou cannot write to $CHANGELOG... This doesn't look serious!\n"
    read -e -i y -n 1 -p "Run as sudo [Yn]? : " 
    [[ "Y" == ${REPLY^} ]] && sudo -E $0
    exit 0
}



# functions 

msg(){ echo -e "$@"; }
panic(){ msg "${@} Exiting."; exit 1;}
ENTRY_FILE=$(mktemp)
change(){
  TMP="$1"
  while true ; do
    echo -e "\nType the nature of the change.\nExample: > mysql: do not start on boot\n"
    read -e -p "> " SUB
    echo -e "* $SUB" >> $TMP
    echo -e "\nTime for some details."
    
    for (( ; ; )); do 
		  echo "Select number or x to quit"
			for (( i=0; i<${#PLUGIN_CONTENT_MENU[@]}; i++)) ; do
				echo "$i)	${PLUGIN_CONTENT_MENU[$i]}"
			done
			echo "x)	No more details."
			read -e -n 1 -p "Your choice? :" REPLY
			if [[ "x" == ${REPLY,,} ]]; then 
				break
			elif [[ -z "${PLUGIN_CONTENT[$REPLY]}" ]] ; then 
			  echo "Unknown Key." 
			else 
			  ${PLUGIN_CONTENT[$REPLY]} $TMP
		  fi	
    done 
    read -e -i "n" -p "Another section? [yN]:" END
    [[ "${END^^}" == "N" ]] && break
  done
  echo -e "\nHere is the content you are about to add.\n\n$(cat $TMP)\n"
  read -e -p "OK? [Yn]: " -i y RETURN
  [[ "N" == ${RETURN^^} ]] && return 1
}

hookContentComment(){
  [[ -z "$1" ]] && echo "Enter a simple comment. Ex: systemctl disable nginx" && return
  TMP="$1"
  read -e -p "Your comment: " CONTENT
  echo "$CONTENT" >> $TMP
}

hookOutputFile(){
  [[ -z "$1" ]] && echo "Writing a local changelog entry to $CHANGELOG" && return
  local t=$(mktemp)
  TMP="$1"
  cat << HEREDOC >$t


$(date "+%Y-%m-%d %H:%M") $CHANGELOG_USERNAME

$( echo -e "$@"|sed 's/^/    /' )
HEREDOC

  [[ -f $CHANGELOG ]] && cat /etc/changelog >> $t 
  cat "$t" > $CHANGELOG
  rm -f "$t"

}


# Build the hook content menu
PLUGIN_CONTENT+=("hookContentComment")
declare -a PLUGIN_CONTENT_MENU

# Build the hook content menu
PLUGIN_OUTPUT+=("hookOutputFile")
declare -a PLUGIN_OUTPUT_MENU

# %PLUGIN% This comment is used to build custom scripts 
[[ -d "plugins-enabled" ]] && [[ -n "plugins-enabled/*" ]] && source plugins-enabled/*

for (( i = 0; i < ${#PLUGIN_OUTPUT[@]} ; i++ )); do 
  TXT=$( ${PLUGIN_OUTPUT[$i]} )
  PLUGIN_OUTPUT_MENU+=("$( ${PLUGIN_OUTPUT[$i]} )")
done
for (( i = 0; i < ${#PLUGIN_CONTENT[@]} ; i++ )); do 
  TXT=$( ${PLUGIN_CONTENT[$i]} )
  PLUGIN_CONTENT_MENU+=("$( ${PLUGIN_CONTENT[$i]} )")
done


# Exec

echo -e "\nWelcome to Serious Changelogs Inc. Do you have something for me?\n"
# set environment variables
[[ -z "$CHANGELOG_USERNAME" ]] && read -e -p "Your name?  " NAME&& read -e -p "Your email? " EMAIL && CHANGELOG_USERNAME="${NAME^}  <$EMAIL>" && echo "export CHANGELOG_USERNAME=\"$CHANGELOG_USERNAME\""
[[ "  <>" == "$CHANGELOG_USERNAME" ]] && panic "srs.ly?"

# check changelog exists
[[ ! -f $CHANGELOG ]] && template "* Changelog: Added $CHANGELOG file\nIt was not serious. Fixed!\n\n"

# parse command 
change "$ENTRY_FILE"

[[ $? -eq 0 ]] && exit 

for (( i=0; i<${#PLUGIN_OUTPUT_MENU[@]}; i++)) ; do
	echo "${PLUGIN_OUTPUT_MENU[$i]}"
	${PLUGIN_OUTPUT[$i]} $ENTRY_FILE
done

rm "$ENTRY_FILE"