#!/usr/bin/env bash

set -euo pipefail

readonly ENTRYPOINT_LIBS="/usr/lib/docker-entrypoint"
source "${ENTRYPOINT_LIBS}/debug.sh"
source "${ENTRYPOINT_LIBS}/logging.sh"

: "${JAVA:=/usr/bin/java}"
readonly ZBX_GATEWAY_CONFIG="${ZABBIX_CONF_DIR}/zabbix_java_gateway_logback.xml"
readonly ZABBIX_JAVA_DIR="/usr/sbin/zabbix_java"
readonly JAVA_CLASSPATH="lib/*:bin/*:ext_lib/*"

run_service() {
    info "** Preparing Zabbix Java Gateway"

    : "${ZBX_TIMEOUT:=3}"

    [[ -f "$ZBX_GATEWAY_CONFIG" ]] || error "Missing configuration file: $ZBX_GATEWAY_CONFIG"

    cd "$ZABBIX_JAVA_DIR"

    local -a java_opts=(
        -server
        "-Dlogback.configurationFile=${ZBX_GATEWAY_CONFIG}"
    )

    if [[ -n "${ZBX_JAVA_OPTS:-}" ]]; then
        read -r -a extra_java_opts <<< "${ZBX_JAVA_OPTS}"
        java_opts+=("${extra_java_opts[@]}")
    fi

    local -a zabbix_opts=(
        "-Dsun.rmi.transport.tcp.responseTimeout=${ZBX_TIMEOUT}000"
        "-Dzabbix.listenPort=${ZBX_LISTEN_PORT:-10052}"
        "-Dzabbix.timeout=${ZBX_TIMEOUT}"
    )

    [[ -n "${ZBX_SERVER:-}" ]] && zabbix_opts+=("-Dzabbix.server=${ZBX_SERVER}")
    [[ -n "${ZBX_LISTEN_IP:-}" ]] && zabbix_opts+=("-Dzabbix.listenIP=${ZBX_LISTEN_IP}")
    [[ -n "${ZBX_START_POLLERS:-}" ]] && zabbix_opts+=("-Dzabbix.startPollers=${ZBX_START_POLLERS}")
    [[ -n "${ZBX_PROPERTIES_FILE:-}" ]] && zabbix_opts+=("-Dzabbix.propertiesFile=${ZBX_PROPERTIES_FILE}")

    local -a cmd=(
        "$JAVA"
        "${java_opts[@]}"
        -classpath "$JAVA_CLASSPATH"
        "${zabbix_opts[@]}"
        com.zabbix.gateway.JavaGateway
    )

    exec "${cmd[@]}"
}

if [[ $# -eq 0 || "${1:-}" == -* ]]; then
    run_service
fi

exec "$@"