#!/bin/bash

basename=$(basename $0)

monitoring_status="/dev/shm/${basename}${USER:+.$USER}.status"

monitoring_disabled="/dev/shm/${basename}${USER:+.$USER}.disabled"

monitoring_turns="/dev/shm/${basename}${USER:+.$USER}.turns"

touch $monitoring_status $monitoring_disabled $monitoring_turns

now=$(date +%s)

function _err () {

    test $# -eq 2 || return

    err[${#err[@]}]="$1"

    err[${#err[@]}]="$2%0a"

}

function _load () {

    local conf=

    local l=

    local d=

    local l_ok=

    local count_loaded=

    local msg=

    local directories=(

        "$HOME/.config/$basename"

        "${0}.d"

        "/usr/local/share/${basename}"

    )

    for conf in $*; do

        count_loaded=0

        if grep -q "^@$conf$" $monitoring_disabled; then

            disabled[${#disabled[@]}]=$conf

        else

            for dir in ${directories[@]}; do

                test -r "$dir/$conf" && source "$dir/$conf" $dir && let count_loaded++

            done

            test $count_loaded -gt 0 && loaded[${#loaded[@]}]=$conf

        fi

    done

    if test ${#loaded[@]} -ne $#; then

        for conf in $*; do

            l_ok=0

            for l in ${loaded[@]}; do

                test $conf == $l && l_ok=1 && break

            done

            if test $l_ok -eq 0; then

                for d in ${disabled[@]}; do

                    test $conf == $d && msg+="$conf (disabled)%0a" && l_ok=1 && break

                done

            fi

            test $l_ok -eq 0 && msg+="$conf%0a"

        done

        _err "_load" "config not loaded:%0a${msg/%%0a}"

    fi

}

function _turn () {

    test -n "$1" && [[ $1 =~ [0-9]+ ]] || return 1

    echo ${FUNCNAME[1]} >> $monitoring_turns

    test $(( $(grep -c ${FUNCNAME[1]} $monitoring_turns) % $1 )) -eq 0 && sed -i "/^${FUNCNAME[1]}$/d" $monitoring_turns

}

function _do_tests () {

    local t=

    for t in $(declare -f | sed -rn '/^[[:alpha:]]/s/^([[:alnum:]_]+)\s*\(\)\s*$/\1/p'); do

        local msg=

        if grep -q "^${t}$" $monitoring_disabled; then

            echo supervision by $t disabled

        else

            msg=$( $t | sed 's/$/%0a/g' )

            if test -n "$msg"; then

                echo "problem: ${t}"

                err[${#err[@]}]=$t

                err[${#err[@]}]="${msg}"

            else

                if ! grep --quiet --word-regexp $t $monitoring_turns; then

                    sed -ri "/^$t=.+$/d" $monitoring_status

                fi

            fi

        fi

    done

}

function _do_manage_errors () {

    source $monitoring_status

    local msg=

    local t=

    local errors=

    local notification=0

    if test ${#err[@]} -gt 0; then

        errors="Supervision $HOSTNAME (${loaded[@]}):%0a"

        for ((i=0; i<${#err[@]}; i++)); do

            t=${err[i]}

            msg=${err[++i]}

            errors="${errors}"'*'" [${t}] ${msg}"

            if test -n "${!t}"; then

                if test ${!t} -lt $(( $now - 86400 )); then

                    sed -ri "s/^(${t}=).+$/\1$now/" $monitoring_status

                    let notification++

                fi

            else

                echo "${t}=$now" >> $monitoring_status

                let notification++

            fi

        done

        errors=$(tr -d '\n' <<< $errors)

        if test "$SHLVL" -eq 1; then

            if test $notification -gt 0; then

                $(dirname "$0")/smsapi "$errors"

            fi

        else

            echo -e ${errors//\%0a/\\n}

        fi

    fi

}

_load ${*:-common-tests $HOSTNAME}

_do_tests

_do_manage_errors