#!/bin/bash

#### Watchdog

#### webcamd - A webcam Service for multiple Cams and Stream Services.
####
#### written by Stephan Wendel aka KwadFan
#### Copyright 2021
#### https://github.com/mainsail-crew/crowsnest
####
#### This File is distributed under GPLv3
####

# Exit upon Errors
set -e

#### Watchdog Functions and Variables
## Do not reuse previous functions!
function clean_watchdog {
    rm -f $PWD/lost-*
}

function webcamd_watchdog {
    # Helper Functions
    function available {
    find ${1} &> /dev/null
    echo $?
    }

    function lost_dev {
        local lostfile
        lostfile="$(echo ${1} | awk -F '/' '{print $NF}')"
        touch /tmp/lost-${lostfile}
    }

    function is_lost {
        local lostdev
        lostdev="$(echo ${1} | awk -F '/' '{print $NF}')"
        find /tmp/lost-${lostdev} &> /dev/null
        echo $?
    }

    function returned_dev {
        local lostdev
        lostdev="$(echo ${1} | awk -F '/' '{print $NF}')"
        rm -f /tmp/lost-${lostdev} &> /dev/null
    }

    # local Vars
    local get_conf_devices conf_cams avail_cams
    # Init empty Arrays
    get_conf_devices=()
    conf_cams=()
    # Grab devices from config file
    get_conf_devices=("$(crudini --existing=file --get "${WEBCAMD_CFG}" | \
    sed '/webcamd/d' | cut -d ' ' -f2)")
    # Construct Array with configured Devices
    for gcd in ${get_conf_devices[*]}; do
        conf_cams+=("$(crudini --get "${WEBCAMD_CFG}" "cam ${gcd}" "device" \
        | awk '{print $1}')")
    done
    # Send Message if Device available or returned.
    for cc in ${conf_cams[*]}; do
    if [ "$(available ${cc})" -ne 0 ] && [ "$(is_lost ${cc})" -ne 0 ]; then
        log_msg "WATCHDOG: Lost Device: "${cc}""
        lost_dev "${cc}"
    elif [ "$(is_lost ${cc})" -eq 0 ] && [ "$(available ${cc})" -eq 0 ]; then
        log_msg "WATCHDOG: Device ${cc} returned."
        returned_dev "${cc}"
    fi
    done
}