#!/usr/bin/env bash

APIkeyFile=".nagiosapikey"
[ ! -r "$APIkeyFile" ] && APIkeyFile="${HOME}/.nagiosapikey"
[ ! -r "$APIkeyFile" ] && APIkeyFile=""

APIKEY=""
XI_URL=""
curl="curl -k -s"

# myDir (for "Directives") are now too big for individual variables.  We'll read them into an associative array instead
declare -A myDir

# We need a separate thing for myOptions and it's easier to have a couple of them be straight variables
declare -A myOptions
myOptions[API]="objects"
myOptions[APIep]="servicestatus"
verbose="0"
tmpJSON=""
tmpQuick=""
tmpQuicker=""

# Different API commands return different JSON datasets.  So let's make a lookup table that figures out where to start the data extracts
declare -A APIinfo
APIinfo["objects/host"]=".host[]"
APIinfo["objects/hoststatus"]=".hoststatus[]"
APIinfo["objects/servicestatus"]=".servicestatus[]"
APIinfo["system/user"]=".users[]"

do_debug() {
  [ "$verbose" -ge "$1" ] && echo "$2" >&2
}

get_myAPI() {
  case "$1" in
    o*) myOptions[API]="objects";;
    *)  myOptions[API]="";;
  esac
}

get_myAPIep() {
  case "$1" in
    h|host) myOptions[APIep]="host";;
    hs|hoststatus) myOptions[APIep]="hoststatus";;
    s|service) myOptions[APIep]="service";;
    ss|servicestatus) myOptions[APIep]="servicestatus";;
    u|user) myOptions[APIep]="user";;
    *) myOptions[APIep]="";;
  esac
}

print_help() {
  cat << HELP_EOF
    --api	< o*bjects | c*onfig | s*ystem >
    -t|--object	< hoststatus | servicestatus | logentries | statehistory | uo | ...
    --url	XI_URL=<value>

    --ace	active_checks_enabled=<0,1>
    -c|--command	check_command=<value>
    -f|--fields	JQ-valid list of fields to show=<value>
    --file	load JSON from=<value>
    --help	This text
    -h|--host	host_name=<value>
    -j|--jq	additional valid JQ=<value>
    --key	APIKEY=<value>
    --keyfile	APIkeyFile=<value>
    --output	output text=<value>
    -Q|--quick	Sets -f to .host_name,.service_description,.current_state,.state_type,.problem_has_been_acknowledged (assumes servicestatus)
    -q		Same as --quick but add -o c
    -qq		Same as --quick but add -o c but also print the first line of the CSV output (fields)
    --save	save JSON to=<value>
    -s|--service	service_description=<value>
    --users	Lists XI users
    --usersa	Lists XI users (advanced)
    --status	Quick select for showing similar things that you would see on main servicestatus page in the GUI
    --bstatus	Same as --status but only show things that are not in an OK state
    --hstatus	Quick select for showing similar things that you would see on a main hoststatus page in the GUI
    --bhstatus	Same as --hstatus but only show things that are not in an OK state
    --state	0, 1, or 2 (or other, I suppose)
    --stype	0, 1 (SOFT or HARD)
    -v|--verbose	verbose=\$((\$verbose + 1))
HELP_EOF
  exit
}

# get_opts
while [ -n "$1" ]; do
  case "$1" in
    --help) print_help;;
    --key) APIKEY="$2"; shift 2;;
    --keyfile) APIkeyFile="$2"; shift 2;;
    --url) XI_URL="$2"; shift 2;;
    -v|--verbose) verbose=$(($verbose + 1)); shift 1;;
    --api) get_myAPI "$2"; shift 2;;
    -t|--object) get_myAPIep "$2"; shift 2;;
    --ack) myDir[problem_has_been_acknowledged]="$2"; shift 2;;
    --ace) myDir[active_checks_enabled]="$2"; shift 2;;
    -c|--command) myDir[check_command]="$2"; shift 2;;
    -D) myDir[$2]="$3"; shift 3;;
    -h|--host) myDir[host_name]="$2"; shift 2;;
    --output) myDir[output]="$2"; shift 2;;
    -s|--service) myDir[service_description]="$2"; shift 2;;
    --state) myDir[current_state]="$2"; shift 2;;
    --stype) myDir[state_type]="$2"; shift 2;;
    --ctrace) myOptions[CommandTrace]="true"; shift 1;;
    --delete) myOptions[Delete]="true"; shift 1;;
    --users) myOptions[Users]="0"; shift 1;;
    --usersa) myOptions[Users]="1"; shift 1;;
    --useradd) myOptions[UserAdd]="$2"; shift 2;;
    --userdel) myOptions[UserDel]="$2"; shift 2;;
    -f|--fields) myOptions[Fields]="$2"; shift 2;;
    --file) myOptions[File]="$2"; shift 2;;
    -j|--jq) myOptions[MoreJQ]="$2"; shift 2;;
    -o|--opt) myOptions[Options]+="$2,"; shift 2;;
    --order) myOptions[OrderBy]="$2"; shift 2;;
    -q) myOptions[Quick]="true"; myOptions[Options]+="c,"; shift 1;;
    -qq) myOptions[Quick]="true"; myOptions[Options]+="c,C,"; shift 1;;
    -Q|--quick) myOptions[Quick]="true"; shift 1;;
    --save) myOptions[Save]="$2"; shift 2;;
    --status) myOptions[Status]="true"; shift 1;;
    --hstatus) myOptions[HStatus]="true"; shift 1;;
    --bstatus) myOptions[Status]="true"; myOptions[BStatus]="true"; shift 1;;
    --bhstatus) myOptions[HStatus]="true"; myOptions[BHStatus]="true"; shift 1;;
    --raw) myOptions[Raw]="true"; shift 1;;
    *) shift 1;;
  esac
done

# Fix things that are impossible to call
[ "${myOptions[API]}" = "config" -a "${myOptions[APIep]}" = "servicestatus" ] && myOptions[APIep]="service"
[ "${myOptions[API]}" = "config" -a "${myOptions[APIep]}" = "hoststatus" ] && myOptions[APIep]="host"

# If we're doing status mode, then override a bunch of other options
if [ -n "${myOptions[Status]}" ]; then
  myOptions[API]="objects"
  myOptions[APIep]="servicestatus"
  myOptions[Options]=""
  myOptions[Quick]="true"
  myOptions[Options]+="c,X,"
  # If we did a bstatus, then we only want things that are bad
  if [ -n "${myOptions[BStatus]}" ]; then
    myDir[current_state]="[^0]"
  fi
fi
if [ -n "${myOptions[HStatus]}" ]; then
  myOptions[API]="objects"
  myOptions[APIep]="hoststatus"
  myOptions[Options]=""
  myOptions[Quick]="true"
  myOptions[Options]+="c,X,"
  # If we did a bstatus, then we only want things that are bad
  if [ -n "${myOptions[BHStatus]}" ]; then
    myDir[current_state]="[^0]"
  fi
fi

# If we're listing users, then set things accordingly
if [ -n "${myOptions[Users]}" ]; then
  myOptions[API]="system"
  myOptions[APIep]="user"
fi

# Get our API key
if [ -n "$APIkeyFile" -a -r "$APIkeyFile" ]; then
  do_debug 1 "Looking for url=$url in $APIkeyFile"
  while read url key; do
    if [ -z "$XI_URL" ]; then
      XI_URL="$url"
      APIKEY="$key"
      do_debug 1 "Found url=$url key=$key"
      break
    fi
    do_debug 2 "-> Looking for url=$url XI_URL=$XI_URL"
    if [[ "$url" =~ "$XI_URL" ]]; then
      XI_URL="$url"
      APIKEY="$key"
    fi
  done < "$APIkeyFile"
fi
do_debug 1 "Final URL=$XI_URL and key=$APIKEY"
[ -z "$XI_URL" -o -z "$APIKEY" ] && echo "Empty URL or Key." && exit

do_api() {
  api_start="$1"
  api_command="$2"
  url="${XI_URL}/api/v1/${api_start}/${api_command}?pretty=0&apikey=${APIKEY}"
  [ -n "${myOptions[OrderBy]}" ] && url+="&orderby=${myOptions[OrderBy]}"
  [ "${myOptions[Users]}" == "1" ] && url+="&advanced=1"
  do_debug 2 "start=$1 command=$2"
  $curl -XGET -k "$url"
}

# Grab a copy of the JSON data so we don't have to keep making calls over and over
# If we used an existing file, then just use that
if [ -z "${myOptions[File]}" ]; then
  tmpJSON=`mktemp`
  do_debug 1 "tmp file is $tmpJSON"
  do_debug 2 "  myAPI is ${myOptions[API]} and myAPIep is ${myOptions[APIep]}"
  do_api "${myOptions[API]}" "${myOptions[APIep]}" > $tmpJSON
else
  do_debug 1 "myFile=${myOptions[File]}"
  tmpJSON="${myOptions[File]}"
  do_debug 1 "tmpJSON=$tmpJSON"
fi

# if mySave is not empty, then we're just saving it into the file called ${myOptions[Save]}
if [ -n "${myOptions[Save]}" ]; then
  mv $tmpJSON ${myOptions[Save]}
  do_debug 1 "JSON data saved to ${myOptions[Save]}"
  exit
fi

# Helper functions for creating our jqString
# First, we need to know if our tests should be case-sensitive or not
jq_check_case() {
  thing="$*"
  do_debug 1 "### JQ_CHECK_CASE looking for thing=$thing"
  if [ -n "$thing" ]; then
    do_debug 2 "### in JQ_CHECK_CASE cmdOptions=${myOptions[Options]}"
    val="| test(\"$thing\""
    [[ "${myOptions[Options]}" =~ "i," ]] && val+="; \"i\""
    echo "$val)"
  else
    echo ""
  fi
}
  
# Create the jQuery search string
jq_get_fields() {
  [[ "${myOptions[Options]}" =~ "c," ]] && jqString+="| [${myOptions[Fields]}] | @csv" || jqString+="| ${myOptions[Fields]}"
}

# Otherwise, let's parse the JSON data here
# Parse our string
do_debug 1 "APIinfo=${APIinfo[${myOptions[API]}/${myOptions[APIep]}]}"
jqString=${APIinfo[${myOptions[API]}/${myOptions[APIep]}]}
do_debug 2 "  Before: jqString=$jqString"
for thing in "${!myDir[@]}"; do
  [ -n "${myDir[$thing]}" ] && jqString+="| select(.$thing $(jq_check_case ${myDir[$thing]}))"
  do_debug 2 "    During: jqString=$jqString"
done
do_debug 2 "  After: jqString=$jqString"

# endpoint specific things
case "${myOptions[API]}/${myOptions[APIep]}" in
  objects/hoststatus) tmpQuick=".host_name,.address,.current_state,.state_type,.last_check,.current_check_attempt,.normal_check_interval,.retry_check_interval,.max_check_attempts,.check_command";
	tmpQuicker="Host,Address,State,Type,Last Check,Attempt,Normal,Retry,Max,Command";;
  objects/servicestatus) tmpQuick=".service_description,.host_name,.current_state,.state_type,.last_check,.current_check_attempt,.normal_check_interval,.retry_check_interval,.max_check_attempts,.output";
	tmpQuicker="Service,Host,State,Type,Last Check,Attempt,Normal,Retry,Max,Output";;
esac

do_debug 1 "myOptions[Options]=${myOptions[Options]}"
if [ -n "${myOptions[Quick]}" -a -n "${myOptions[Fields]}" ]; then
  myOptions[Fields]="$tmpQuick,${myOptions[Fields]}"
elif [ -n "${myOptions[Quick]}" ]; then
  myOptions[Fields]="$tmpQuick"
fi
[[ ${myOptions[Options]} =~ "C," ]] && echo "${myOptions[Fields]}"
[[ ${myOptions[Options]} =~ "X," ]] && echo "$tmpQuicker" && printf '%*s\n' "${COLUMNS:-$(tput cols)}" '' | tr ' ' -
do_debug 1 "myOptions[Fields]=${myOptions[Fields]}"
[ -n "${myOptions[Fields]}" ] && jq_get_fields
jqString+="${myOptions[MoreJQ]}"
do_debug 1 "jqString=$jqString"

if [ -n "${myOptions[Raw]}" ]; then
  do_debug 1 "*** RAW specified *** Overriding all other options"
  cat $tmpJSON
else
  cat $tmpJSON | jq -r "$jqString"
fi
[ -z "${myOptions[File]}" ] && rm $tmpJSON

exit