import type { HttpContext } from '@adonisjs/core/http'
import type { NextFn } from '@adonisjs/core/types/http'
// @ts-ignore - xml-formatter types conflict with ESM interop
import formatXml from 'xml-formatter'
import { Tr069TraceService } from '#services/tr069_trace_service'
import { ExchangeStoreService } from '#services/exchange_store_service'
import logger from '@adonisjs/core/services/logger'

/**
 * CWMP Logger Middleware
 *
 * Buffers SOAP request/response. After next():
 * - Always logs a brief summary (INFO) to the app logger.
 * - For traced devices:
 *   1. Persists raw XML to ExchangeStoreService (new structured MongoDB storage)
 *   2. Writes pretty-printed XML to file-based logs (legacy, kept for Phase 1 dual-write safety)
 *
 * The ExchangeStoreService calls are fire-and-forget: they never block CWMP processing.
 */
export default class CwmpLoggerMiddleware {
  private prettyXml(xml: string): string {
    try {
      return (formatXml as any)(xml, {
        indentation: '  ',
        collapseContent: true,
        lineSeparator: '\n',
      })
    } catch {
      return xml
    }
  }

  async handle(ctx: HttpContext, next: NextFn) {
    const { request, response } = ctx
    const rawBody = request.raw() || ''

    const socket = request.request?.socket
    const remoteIp = request.ip()
    const remotePort = socket?.remotePort || 0
    const localAddress = socket?.localAddress || 'unknown'
    const localPort = socket?.localPort || 0
    const sessionId = `${remoteIp}:${remotePort}->${localAddress}:${localPort}`

    let capturedResponseXml: string | null = null
    let isEmptyResponse = false
    const originalSend = response.send.bind(response)
    response.send = (body: any) => {
      if (typeof body === 'string' && body.includes('soap-env:Envelope')) {
        capturedResponseXml = body
      } else if (!body || (typeof body === 'string' && body.trim() === '')) {
        isEmptyResponse = true
      }
      return originalSend(body)
    }

    await next()

    const deviceId = ctx.cwmpDeviceId
    const traceService = Tr069TraceService.getInstance()
    const isTraced = deviceId ? traceService.isTraced(deviceId) : false

    if (isTraced && deviceId) {
      // New system: persist raw XML to MongoDB (fire-and-forget, never blocks CWMP)
      // Ordering is guaranteed by the per-device queue in ExchangeStoreService
      const exchangeStore = ExchangeStoreService.getInstance()

      // Persist CPE→ACS (including empty POST)
      exchangeStore.persistExchange({
        deviceId,
        direction: 'CPE→ACS',
        sessionId,
        rawXml: rawBody || '',
      }).catch(() => {})

      // Persist ACS→CPE response (will queue after the CPE→ACS above)
      if (capturedResponseXml) {
        exchangeStore.persistExchange({
          deviceId,
          direction: 'ACS→CPE',
          sessionId,
          rawXml: capturedResponseXml,
        }).catch(() => {})
      } else if (isEmptyResponse) {
        exchangeStore.persistExchange({
          deviceId,
          direction: 'ACS→CPE',
          sessionId,
          rawXml: '',
        }).catch(() => {})
      }

      // Old system: file-based writes (kept for Phase 1 dual-write rollback safety)
      if (rawBody && rawBody.trim() !== '') {
        traceService.writeExchange(deviceId, 'CPE→ACS', sessionId, this.prettyXml(rawBody))
      }
      if (capturedResponseXml) {
        traceService.writeExchange(
          deviceId,
          'ACS→CPE',
          sessionId,
          this.prettyXml(capturedResponseXml)
        )
      }
    } else if (rawBody && rawBody.trim() !== '') {
      // Brief app-level log only (no SOAP body)
      logger.debug({ sessionId, deviceId: deviceId ?? 'unknown' }, 'TR-069 exchange (not traced)')
    }

    // Always log full XML at debug level regardless of trace status
    if (rawBody && rawBody.trim() !== '') {
      logger.debug(
        { sessionId, deviceId: deviceId ?? 'unknown', direction: 'CPE→ACS', xml: this.prettyXml(rawBody) },
        'CWMP XML request'
      )
    }
    if (capturedResponseXml) {
      logger.debug(
        { sessionId, deviceId: deviceId ?? 'unknown', direction: 'ACS→CPE', xml: this.prettyXml(capturedResponseXml) },
        'CWMP XML response'
      )
    } else if (isEmptyResponse) {
      logger.debug(
        { sessionId, deviceId: deviceId ?? 'unknown', direction: 'ACS→CPE' },
        'CWMP empty response (204)'
      )
    }
  }
}