#!/bin/bash
XL_PRODUCT="Simple Note System"
XL_VER="v2a"

# Environment
readonly SNS_STORE="$HOME/.local/sns"
readonly SNS_KEYFILE="$SNS_STORE/.pubkey"
readonly SNS_DEPS=("gpg" "tree" "git")
readonly IFS=$'\n\t'
set -euo pipefail

# Function Definitions
# sns_initStore      Initializes the SNS Store                             ( -i)
# sns_printHelp      Prints help page                                      ( -h)
# sns_list           Lists all notes in `tree` format                      (  *)
# sns_create         Creates note; calls sns_edit()                        ( -c)
# sns_edit           Decrypts note to /tmp, calls editor, re-encrypts note ( -e)
# sns_print          Prints note to stdout                                 ( -p)
# sns_rm             Deletes note from store                               ( -d)
# sns_gitPassthrough Passes through all instructions to git                (git)
# sns_checkDeps      Checks the system for required dependencies
# sns_checkStore     Checks if $SNS_STORE exists
# sns_sanityCheck    Wrapper for sns_checkDeps and sns_checkStore

function sns_initStore {
  mkdir -p "$SNS_STORE"
  echo $* | awk '{print $1}' > "$SNS_KEYFILE"
}
function sns_printHelp(){
  printf "%s" "Import helpfile from sns v2"
}
function sns_list(){
  cd "$SNS_STORE" || exit
  tree -C --noreport "$(echo $* | awk '{print $1}')"
}
function sns_create(){
  gpg -r "$SNS_PUBKEY" -o "echo $* | awk '{print $1}'" < /dev/null
  sns_edit "echo $* | awk '{print $1}'"
}
function sns_print(){
  gpg -d "echo $* | awk '{print $1}'"
}
function sns_rm(){
  rm -f "echo $* | awk '{print $1}'"
}
function sns_gitPassthrough(){
  cd "$SNS_STORE" || exit;
  git "$@";
}
function sns_checkDeps(){
  local SNS_RETURN="true";
  for DEP in "${SNS_DEPS[@]}"; do
    if test  ! -e "$(which gpg 2>/dev/null)"; then
      echo "Dependency missing: $DEP";
      SNS_RETURN="false";
    fi
  done
  "$SNS_RETURN";
}
function sns_checkStore(){
  if [ -d "$SNS_STORE" ]; then true; else false; fi
}
function sns_sanityCheck {
  if ! sns_checkDeps; then
    exit 10
  fi
  if ! sns_checkStore; then
    if [ "$(echo "$SNS_ACTION" | awk '{print $1;}')" != "sns_initStore" ]; then
      printf "%s\n" "Please run \`sns -i\` to initialize sns."
      exit 20
    fi
  fi
}
function sns_argParse(){
  declare -ga SNS_ACTION=()
  while getopts ":i:hc:e:p:d:" OPT; do
    case "$OPT" in
      i)
        SNS_ACTION=("sns_initStore" "$OPTARG");;
      h)
        SNS_ACTION=("sns_printHelp");;
      c)
        SNS_ACTION=("sns_create $OPTARG");;
      e)
        SNS_ACTION=("sns_edit $OPTARG");;
      p)
        SNS_ACTION=("sns_print $OPTARG");;
      d)
        SNS_ACTION=("sns_rm $OPTARG");;
    esac
  done
  if [ "${#SNS_ACTION[@]}" -eq 0 ]; then
    if [ "$(echo "$@" | awk '{print $1}')" == "git" ]; then
      SNS_ACTION=($@)
    else
      if [ -d "$SNS_STORE/$*" ]; then
        SNS_ACTION=("sns_list" "./$*")
      fi
    fi
  fi
}

# Entry Point
printf "%s\n%s\n" "$XL_PRODUCT" "$XL_VER"
sns_argParse "$@"
sns_sanityCheck
"${SNS_ACTION[@]}"