import Schema from 'async-validator';
import type { MqttSettingsType } from 'types';

import { IP_OR_HOSTNAME_VALIDATOR } from './shared';

// Constants for validation ranges
const PORT_MIN = 0;
const PORT_MAX = 65535;
const KEEP_ALIVE_MIN = 1;
const KEEP_ALIVE_MAX = 86400;
const HEARTBEAT_MIN = 10;
const HEARTBEAT_MAX = 86400;

// Reusable validator rules
const REQUIRED_HOST_VALIDATOR = [
  { required: true, message: 'Host is required' },
  IP_OR_HOSTNAME_VALIDATOR
];

const REQUIRED_BASE_VALIDATOR = [{ required: true, message: 'Base is required' }];

const PORT_VALIDATOR = [
  { required: true, message: 'Port is required' },
  {
    type: 'number' as const,
    min: PORT_MIN,
    max: PORT_MAX,
    message: `Port must be between ${PORT_MIN} and ${PORT_MAX}`
  }
];

const createNumberValidator = (fieldName: string, min: number, max: number) => [
  { required: true, message: `${fieldName} is required` },
  {
    type: 'number' as const,
    min,
    max,
    message: `${fieldName} must be between ${min} and ${max}`
  }
];

export const createMqttSettingsValidator = (mqttSettings: MqttSettingsType) =>
  new Schema({
    ...(mqttSettings.enabled && {
      host: REQUIRED_HOST_VALIDATOR,
      base: REQUIRED_BASE_VALIDATOR,
      port: PORT_VALIDATOR,
      keep_alive: createNumberValidator(
        'Keep alive',
        KEEP_ALIVE_MIN,
        KEEP_ALIVE_MAX
      ),
      publish_time_heartbeat: createNumberValidator(
        'Heartbeat',
        HEARTBEAT_MIN,
        HEARTBEAT_MAX
      )
    })
  });