export RUN_ENGINE_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# load default conf
if [ -e "$RUN_ENGINE_PATH/conf.dist" ]; then
    source "$RUN_ENGINE_PATH/conf.sh.dist"
fi

function finish {
    if [ ! -z "$SCREEN_NAME" ]; then
        screen -X -S "$SCREEN_NAME" quit
    fi
}

# disabled for now, but could be useful if we want 
# shutdown the process if restarter crashes for some reason
# trap finish EXIT

function configureFiles() {
    TRACE_BEGIN_STRING="SIGSEGV"
    TRACE_FILE="$LOGS_PATH/"$LOG_PREFIX_NAME"_trace.log"
    ERR_FILE="$LOGS_PATH/"$LOG_PREFIX_NAME"_error.log"
    SYSLOG="$LOGS_PATH/"$LOG_PREFIX_NAME"_system.log"
    SYSERR="$LOGS_PATH/"$LOG_PREFIX_NAME"_system.err"
    LINKS_FILE="$LOGS_PATH/"$LOG_PREFIX_NAME"_crash_links.link"
}

function checkStatus() {
    local ret=1
    # wipe do : destroy old screens + ls
    #screen -wipe
    #if screen -ls $1 | grep -q "No Sockets found"
    #then
    #    return 0
    #fi

    local gdbres=$(pgrep -f "gdb -x $GDB --batch $SERVERBIN")
    if [[ $GDB_ENABLED -eq 1 && ! -z $gdbres ]]; then
        return 1
    fi

    #
    # This is a specific check for Azeroth Core in case of screen failure
    # It is possible since same binary file cannot be launched with same configuration file
    # This is an extra check
    #
    local binres=$(pgrep -f "$SERVERBIN -c $CONFIG")
    if [ ! -z $binres ]; then
        return 1
    fi

    return 0
}

function run() {
    echo $1
    if [ ! -z $1 ]; then
        local OPTIONS="-A -m -d -S"
        if [ ! -z "$SCREEN_OPTIONS" ]; then
            OPTIONS=$SCREEN_OPTIONS
        fi

        echo "> Starting with screen ( screen $OPTIONS )"

        screen $OPTIONS $1 "$RUN_ENGINE_PATH/starter" $2 $3 "$4" "$5" "$6" $7 "$BINPATH/crashes"
    else
        $RUN_ENGINE_PATH/starter $2 $3 "$4" "$5" "$6" $7 "$BINPATH/crashes"
    fi
}

function starter() {
    cd $BINPATH

    mkdir -p "$LOGS_PATH"
    mkdir -p "$BINPATH"/crashes

    configureFiles

    run "$SCREEN_NAME" "$SERVERBIN" "$GDB" "$CONFIG" "$SYSLOG" "$SYSERR" "$GDB_ENABLED"
}


function restarter() {
    cd $BINPATH

    mkdir -p "$LOGS_PATH"
    mkdir -p "$BINPATH"/crashes

    configureFiles

    if [ ! -f $TRACE_FILE ]; then
        touch $TRACE_FILE
    fi

    while :
    do
        if checkStatus $SCREEN_NAME; then
            DATE=$(date)
            echo "Restarting $SCREEN_NAME Core blizz($DATE)"
            if [ $GDB_ENABLED -eq 1 ]; then
                    echo "GDB enabled"
                    grep -B 10 -A 1800 "$TRACE_BEGIN_STRING" "$SYSLOG" >> "$TRACE_FILE"
                    cat "$SYSERR" > "$ERR_FILE"
                    run "$SCREEN_NAME" "$SERVERBIN" "$GDB" "$CONFIG" "$SYSLOG" "$SYSERR" 1
            fi

            if [ $GDB_ENABLED -eq 0 ]; then
                    echo "GDB disabled"
                    run "$SCREEN_NAME" "$SERVERBIN" null "$CONFIG" null null 0
            fi
        fi

        sleep 10
    done
}