#!/bin/bash

################################################################################
# STATE_MACHINE.SH
# ----------------
# This script saves the last message for a certain key and compares the next
# message for the same key to not have any repeating notifications.
#
# Author: Robin Meier - robin@meier.si
################################################################################

set -o allexport
source /root/scripts/config/state_machine
set +o allexport

mkdir -p $STORAGE_PATH # Make sure STORAGE_PATH exists

# Get input from standard input or via first parameter
if [[ $# -eq 0 ]]; then
  echo "[ERROR] Not enough arguments!"
  exit 1
elif [[ $# -eq 1 ]]; then
  MESSAGE=$(timeout 32 cat)
  KEY=$1
elif [[ $# -eq 2 ]]; then
  KEY=$1
  MESSAGE=$2
else
  echo "[ERROR] Too many arguments!"
  exit 1
fi

# Check if KEY is empty
if [[ -z "${KEY}" ]]; then
  echo "[ERROR] KEY argument is missing!"
  exit 1
fi

KEY_FILE="${STORAGE_PATH}/${KEY}.txt"

if [[ -f $KEY_FILE && -z "${MESSAGE}" ]]; then
  # Previous message present and empty message now
  OLD_MESSAGE=$(cat $KEY_FILE)
  echo "✅ Resolved"
  echo "$OLD_MESSAGE"
  rm $KEY_FILE
  exit 0
elif [[ -f $KEY_FILE ]]; then
  # Message and previous message present
  OLD_MESSAGE=$(cat $KEY_FILE)
  # Compare contents
  if [[ "$OLD_MESSAGE" == "$MESSAGE" ]]; then
    # Check last notification
    if [ "$(( $(date +"%s") - $(stat -c "%Y" "$KEY_FILE") ))" -gt "$RENOTIFY_AGE_SEC" ]; then
      touch $KEY_FILE
      echo "‼️Renotify"
    else
      exit 0
    fi
  else
    echo "$MESSAGE" > $KEY_FILE
    echo "⁉️Changed"
  fi
else
  if [[ -z "${MESSAGE}" ]]; then
    # No message present
    exit 0
  fi

  # New message present, create KEY_FILE, continue to relaying
  echo "$MESSAGE" > $KEY_FILE
  echo "❗New"
fi

# Relay message if made it until here (Quotes are important here, so lines dont get .join(' ')-ed)
echo "$MESSAGE"

exit 0