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

CHANGELOG=/etc/changelog


# 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<${#HOOKS_CONTENT_MENU[@]}; i++)) ; do
				echo "$i)	${HOOKS_CONTENT_MENU[$i]}"
			done
			echo "x)	No more details."
			read -e -n 1 -p "Your choice? :" REPLY
			if [[ "x" == ${REPLY,,} ]]; then 
				break
			elif [[ -z "${HOOKS_CONTENT[$REPLY]}" ]] ; then 
			  echo "Unknown Key." 
			else 
			  ${HOOKS_CONTENT[$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
  echo $TMP
}

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"

}

# Exec

# Build the hook content menu
HOOKS_CONTENT+=("hookContentComment")
declare -a HOOKS_CONTENT_MENU
[[ -n "hooks-content/*" ]] && source hooks-content/*
for (( i = 0; i < ${#HOOKS_CONTENT[@]} ; i++ )); do 
  TXT=$( ${HOOKS_CONTENT[$i]} )
  HOOKS_CONTENT_MENU+=("$( ${HOOKS_CONTENT[$i]} )")
done

# Build the hook content menu
HOOKS_OUTPUT+=("hookOutputFile")
declare -a HOOKS_OUTPUT_MENU
[[ -n "hooks-output/*" ]] && source hooks-output/*
for (( i = 0; i < ${#HOOKS_OUTPUT[@]} ; i++ )); do 
  TXT=$( ${HOOKS_OUTPUT[$i]} )
  HOOKS_OUTPUT_MENU+=("$( ${HOOKS_OUTPUT[$i]} )")
done




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"

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

rm "$ENTRY_FILE"