#!/bin/bash
# ======================================================================
#
# Check DOCKERCONTAINER INFOS
#
# requirements:
# - docker
# - sudo permissions on docker command
#
# ----------------------------------------------------------------------
# Cli docs:
# https://docs.docker.com/engine/reference/commandline/docker/
# ----------------------------------------------------------------------
# 2024-01-18  v0.1  <axel.hahn@unibe.ch>      init
# 2024-02-13  v1.0  <axel.hahn@unibe.ch>      update docker ps --format
# ======================================================================


. $(dirname $0)/inc_pluginfunctions
. $(dirname $0)/inc_dockerfunctions.sh

self_APPVERSION=1.0

# ----------------------------------------------------------------------
# FUNCTIONS
# ----------------------------------------------------------------------


# show help
function _usage(){
    local _self=$( basename $0 )
    cat <<EOH
$( ph.showImlHelpHeader )

List existing containers and show container details.
To show details you can enter an id or define a regex

USAGE:
  $_self [OPTIONS]

OPTIONS:
  -h  Show this help and exit.
  -s  Show containers using 'docker ps --all' and exit.
  -i ID
      Show details for container with given id.
  -f REGEX
      Show details for first matching container with given regex in output
      of 'docker ps --all'.

  If the options -i and -f are used then -i ID has priority.

PARAMETERS:
  ID     Hexadcimal value for the container id
  REGEX  String to filter the container list. With it you can set an image 
         name or a container name.

EXAMPLES:
  $_self -s
      Show all containers 

  $_self -i 0356f42ed27d
      Show container details of container with id 0356f42ed27d

  $_self -f myapp
      Show container details of first container that matches "myapp" in the
      output of the container list.

EOH
}


# ----------------------------------------------------------------------
# MAIN
# ----------------------------------------------------------------------

ph.hasParamoption "h" "$@"; bOptHelp=$?

if [ $bOptHelp -eq 0 ]; then
    _usage
    exit 0
fi

if [ -z "$1" ]; then
    ph.setStatus critical
    ph.status "No parameters were given. Use -h to get help."
    ph.exit    
fi

ph.require "docker"
ph.require "jq"

if ph.hasParamoption "s" "$@"; then
    echo "List of all containers (docker ps --all):"
    echo
    docker ps --all
    echo
    exit 0
fi

# --- get data

id=$(ph.getValueWithParam '' i "$@")
regex=$(ph.getValueWithParam '' f "$@")

if [ -z "$id" ]; then
    if [ -n "$regex" ]; then
        id=$( docker ps --all | grep -E "$regex" | head -1 | awk '{ print $1 }' )
    fi
fi
if [ -z "$id" ]; then
    ph.setStatus critical
    ph.status "No Docker id was given / found. Use -s to show all containers."
    ph.exit
fi

_detectDockerenv

# data=$( sudo -n --preserve-env docker ps --all --format "{{ json . }}" --filter "id=$id" 2>/dev/null )
data=$( sudo -n --preserve-env docker ps --all --format '{
    "Names": "{{.Names}}", 
    "State": "{{.State}}", 
    "Status": "{{.Status}}", 
    "Status": "{{.Status}}",
    "RunningFor": "{{.RunningFor}}",
    "Image": "{{.Image}}",
    "CreatedAt": "{{.CreatedAt}}",
    "Size": "{{.Size}}",
    "Mounts": "{{.Mounts}}",
    "Ports": "{{.Ports}}"
}' --filter "id=$id" 2>/dev/null )
   
if [ -z "$data" ] ; then
    ph.setStatus critical
    ph.status "Docker id [$id] does not exist. Use -s to show all containers."
    ph.exit
fi

sState=$(  _getString "$data" ".State" )
sCreated=$(_getString "$data" ".RunningFor" )
sStatus=$( _getString "$data" ".Status" )

# --- generate result

test "$sState" != "running" && ph.setStatus warning
test "$sState" = "exited"   && ph.setStatus critical

# --- output

ph.status "Docker id [$id] $sState .. created $sCreated .. $sStatus"
echo "
NAME $( _getString "$data" ".Names" )

  image  : $( _getString "$data" ".Image" )
  created: $( _getString "$data" ".CreatedAt" ) .. $sCreated
  size   : $( _getString "$data" ".Size" )

  mounts : $( _getString "$data" ".Mounts" )
  ports  : $( _getString "$data" ".Ports" | grep . || echo '(None)')
"

ph.exit

# ----------------------------------------------------------------------