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'

/**
 * CWMP Logger Middleware
 *
 * Middleware dédié à l'observation des messages TR-069 XML.
 * Trace les échanges CPE↔ACS (requêtes entrantes et réponses sortantes)
 * avec le XML pretty-printed directement sur stdout pour lisibilité humaine.
 *
 * Doit être placé avant le cwmp_middleware dans la chaîne.
 */
export default class CwmpLoggerMiddleware {
  private prettyXml(xml: string): string {
    try {
      return (formatXml as any)(xml, { indentation: '  ', collapseContent: true, lineSeparator: '\n' })
    } catch {
      return xml
    }
  }

  private log(direction: string, sessionId: string, xml: string) {
    const timestamp = new Date().toISOString()
    const separator = '─'.repeat(80)
    process.stdout.write(
      `\n${separator}\n` +
      `[TR-069] ${direction} | ${timestamp} | ${sessionId}\n` +
      `${separator}\n` +
      `${xml}\n` +
      `${separator}\n\n`
    )
  }

  async handle({ request, response }: HttpContext, next: NextFn) {
    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}`

    // Log incoming TR-069 message
    if (rawBody && rawBody.trim() !== '') {
      this.log('CPE→ACS', sessionId, this.prettyXml(rawBody))
    }

    // Intercept response to log outgoing XML
    const originalSend = response.send.bind(response)
    response.send = (body: any) => {
      if (typeof body === 'string' && body.includes('soap-env:Envelope')) {
        this.log('ACS→CPE', sessionId, this.prettyXml(body))
      }
      return originalSend(body)
    }

    return next()
  }
}