import { randomBytes } from 'node:crypto'
import {
  Cwmp_1_0,
  Download,
  FactoryReset,
  type FaultCodeType,
  FaultDetail,
  FaultStruct,
  Fault,
  GetParameterAttributes,
  GetParameterNames,
  GetParameterValues,
  InformResponse,
  ParameterValueList,
  Reboot,
  ScheduleInform,
  SetParameterAttributes,
  SetParameterAttributesList,
  SetParameterAttributesStruct,
  AccessList,
  SetParameterValues,
  TransferCompleteResponse,
  Upload,
} from '../cwmp-1-0.js'
import {
  CwmpID,
  NAMESPACES,
  SoapEnvelope,
  type SoapEnvelopeAttribute,
  SoapEnvelopeHeader,
} from '../soap_envelope.js'
import type {
  DownloadTaskPayload,
  UploadTaskPayload,
  SetParameterValuesTaskPayload,
  SetParameterAttributesTaskPayload,
} from '../tr069_types.js'

function generateCwmpID(): string {
  return randomBytes(4).toString('hex')
}

function makeEnvelope(cwmpId?: string): SoapEnvelope {
  const enve = new SoapEnvelope()
  enve.$ = NAMESPACES['1.0'] as SoapEnvelopeAttribute
  enve.Header = new SoapEnvelopeHeader()
  enve.Header.ID = new CwmpID({
    $: { MustUnderstand: '1' },
    _: cwmpId || generateCwmpID(),
  })
  enve.Body = new Cwmp_1_0()
  return enve
}

export class CWMPMessageBuilder {
  static informResponse(cwmpId?: string): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.InformResponse = new InformResponse({ MaxEnvelopes: 1 })
    return enve.getXml()
  }

  static getParameterNames(
    cwmpId: string | undefined,
    parameterPath: string,
    nextLevel: boolean = true
  ): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.GetParameterNames = new GetParameterNames({
      ParameterPath: parameterPath,
      NextLevel: nextLevel,
    })
    return enve.getXml()
  }

  static getParameterValues(cwmpId: string | undefined, parameterNames: string[]): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.GetParameterValues = new GetParameterValues({ ParameterNames: parameterNames })
    return enve.getXml()
  }

  static setParameterValues(
    cwmpId: string | undefined,
    parameters: Array<{ name: string; value: string; type: string }>
  ): string {
    const pvStructs = parameters.map((p) => ({
      Name: p.name,
      Value: { _: p.value, $: { Type: p.type } },
    }))
    const pvList = new ParameterValueList({
      $: { ArrayType: `cwmp:ParameterValueStruct[${pvStructs.length}]` },
      ParameterValueStruct: pvStructs,
    })
    const enve = makeEnvelope(cwmpId)
    enve.Body.SetParameterValues = new SetParameterValues({
      ParameterValueList: pvList,
      ParameterKey: 'papaye-v2',
    })
    return enve.getXml()
  }

  static setParameterValuesFromPayload(
    cwmpId: string | undefined,
    payload: SetParameterValuesTaskPayload
  ): string {
    const params = (payload.parameterValueList || []).map((p) => ({
      name: p.Name,
      value: String(p.Value?._ ?? ''),
      type: p.Value?.$?.Type || 'xsd:string',
    }))
    return CWMPMessageBuilder.setParameterValues(cwmpId, params)
  }

  static download(cwmpId: string | undefined, params: DownloadTaskPayload): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.Download = new Download({
      CommandKey: params.commandKey || '',
      FileType: params.fileType || '1 Firmware Upgrade Image',
      URL: params.url,
      Username: params.username || '',
      Password: params.password || '',
      FileSize: params.fileSize || 0,
      TargetFileName: params.targetFileName || '',
      DelaySeconds: params.delaySeconds || 0,
      SuccessURL: params.successUrl || '',
      FailureURL: params.failureUrl || '',
    })
    return enve.getXml()
  }

  static upload(cwmpId: string | undefined, params: UploadTaskPayload): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.Upload = new Upload({
      CommandKey: params.commandKey || '',
      FileType: params.fileType || '3 Vendor Configuration File',
      URL: params.url,
      Username: params.username || '',
      Password: params.password || '',
      DelaySeconds: params.delaySeconds || 0,
    })
    return enve.getXml()
  }

  static reboot(cwmpId?: string, commandKey?: string): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.Reboot = new Reboot({ CommandKey: commandKey || '' })
    return enve.getXml()
  }

  static factoryReset(cwmpId?: string): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.FactoryReset = new FactoryReset({})
    return enve.getXml()
  }

  static scheduleInform(
    cwmpId: string | undefined,
    delaySeconds: number,
    commandKey?: string
  ): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.ScheduleInform = new ScheduleInform({
      DelaySeconds: delaySeconds,
      CommandKey: commandKey || '',
    })
    return enve.getXml()
  }

  static getParameterAttributes(cwmpId: string | undefined, parameterNames: string[]): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.GetParameterAttributes = new GetParameterAttributes({
      ParameterNames: parameterNames,
    })
    return enve.getXml()
  }

  static setParameterAttributes(
    cwmpId: string | undefined,
    attributes: SetParameterAttributesTaskPayload[]
  ): string {
    const structs = attributes.map(
      (a) =>
        new SetParameterAttributesStruct({
          Name: a.name,
          NotificationChange: a.notificationChange,
          Notification: a.notification,
          AccessListChange: a.accessListChange,
          AccessList: new AccessList({ string: a.accessList }),
        })
    )
    const list = new SetParameterAttributesList({ SetParameterAttributesStruct: structs })
    const enve = makeEnvelope(cwmpId)
    enve.Body.SetParameterAttributes = new SetParameterAttributes({ ParameterList: list })
    return enve.getXml()
  }

  static transferCompleteResponse(cwmpId?: string): string {
    const enve = makeEnvelope(cwmpId)
    enve.Body.TransferCompleteResponse = new TransferCompleteResponse({})
    return enve.getXml()
  }

  static soapFault(faultCode: FaultCodeType, reason: string): string {
    const fault = new Fault()
    fault.Faultcode = 'Server'
    fault.Faultstring = reason
    fault.Detail = new FaultDetail({
      Fault: new FaultStruct({ FaultCode: faultCode, FaultString: reason }),
    })
    return fault.getXml()
  }

  static emptyResponse(): string {
    return ''
  }
}