#!/usr/bin/env bash

WORK_DIR=${WORK_DIR:?"WORK_DIR is not set!!"}
INCOME_DIR=${INCOME_DIR:="${WORK_DIR}/income"}
CODENAME=(bookworm)

set -o functrace
set -o nounset
set -o errtrace
set -o errexit

function msg {
    local mesg="$1"; shift
    printf "====> ${mesg}\n" "$@"
}

function term_handle {
    if [[ -n "$inotify_pid" ]]
    then
        GO_ON=0
        msg "sending TERM to inotifywait..."
        kill -s TERM "$inotify_pid" 2>/dev/null || true
    fi
}
function term_delay  {
    GO_ON=0
    msg "building repo, will terminate later"
}
trap 'term_handle' TERM SIGINT INT


function build_repo {
    trap 'term_delay' TERM SIGINT INT

    for deb in "${INCOME_DIR}/"*
    do
        if [[ "$deb" = *"/*" ]]
        then
            msg "no file in $INCOME_DIR, skip this build"
            break
        fi

        msg "start adding $deb"
        for codename in "${CODENAME[@]}"
        do
            msg "adding $deb into $codename"
            reprepro includedeb "$codename" "$deb"
        done
        msg "finished adding $deb"

        msg "removing $deb from income dir $INCOME_DIR"
        rm $deb
    done

    trap 'term_handle' TERM SIGINT INT
}

cd "$WORK_DIR"

GO_ON=1             # flag of if continue the loop
PROGRAM_NAME="$0"
while [[ "$GO_ON" = "1" ]]
do
    build_repo

    msg "start watching $INCOME_DIR"
    inotifywait --quiet -e move -e modify -e create "$INCOME_DIR" &
    inotify_pid="$!"

    # when inotifywait was killed, its return code is no-zero,
    # so when wait return inotifywait's return code, script will exit due to errexit
    wait || true
done

msg "$PROGRAM_NAME shutdown"