// Created by: Claude
// Date: 2026-01-03
// Purpose: Indicateur de qualité de connexion WebRTC
// Refs: client/CLAUDE.md

import React, { useEffect, useState } from 'react'
import styles from './ConnectionIndicator.module.css'

export interface ConnectionIndicatorProps {
  peerConnection?: RTCPeerConnection
  peerId: string
  username: string
}

type ConnectionQuality = 'excellent' | 'good' | 'poor' | 'disconnected'

const ConnectionIndicator: React.FC<ConnectionIndicatorProps> = ({
  peerConnection,
  peerId,
  username,
}) => {
  const [quality, setQuality] = useState<ConnectionQuality>('disconnected')
  const [stats, setStats] = useState<{
    rtt?: number // Round-trip time en ms
    packetsLost?: number
    jitter?: number // En ms
  }>({})

  useEffect(() => {
    if (!peerConnection) {
      setQuality('disconnected')
      return
    }

    // Surveiller l'état de connexion
    const handleConnectionStateChange = () => {
      const state = peerConnection.connectionState
      console.log(`[${username}] Connection state:`, state)

      if (state === 'connected') {
        setQuality('good')
      } else if (state === 'connecting') {
        setQuality('poor')
      } else if (state === 'disconnected' || state === 'failed' || state === 'closed') {
        setQuality('disconnected')
      }
    }

    peerConnection.addEventListener('connectionstatechange', handleConnectionStateChange)
    handleConnectionStateChange() // État initial

    // Récupérer les stats toutes les 2 secondes
    const statsInterval = setInterval(async () => {
      if (peerConnection.connectionState !== 'connected') {
        return
      }

      try {
        const stats = await peerConnection.getStats()
        let rtt: number | undefined
        let packetsLost = 0
        let jitter: number | undefined

        stats.forEach((report) => {
          if (report.type === 'candidate-pair' && report.state === 'succeeded') {
            rtt = report.currentRoundTripTime ? report.currentRoundTripTime * 1000 : undefined
          }

          if (report.type === 'inbound-rtp' && report.kind === 'video') {
            packetsLost = report.packetsLost || 0
            jitter = report.jitter ? report.jitter * 1000 : undefined
          }
        })

        setStats({ rtt, packetsLost, jitter })

        // Déterminer la qualité selon RTT
        if (rtt !== undefined) {
          if (rtt < 100) {
            setQuality('excellent')
          } else if (rtt < 200) {
            setQuality('good')
          } else {
            setQuality('poor')
          }
        }
      } catch (error) {
        console.error('Error getting WebRTC stats:', error)
      }
    }, 2000)

    return () => {
      peerConnection.removeEventListener('connectionstatechange', handleConnectionStateChange)
      clearInterval(statsInterval)
    }
  }, [peerConnection, username])

  const getQualityIcon = () => {
    switch (quality) {
      case 'excellent':
        return '📶'
      case 'good':
        return '📡'
      case 'poor':
        return '⚠️'
      case 'disconnected':
        return '❌'
    }
  }

  const getQualityLabel = () => {
    switch (quality) {
      case 'excellent':
        return 'Excellente'
      case 'good':
        return 'Bonne'
      case 'poor':
        return 'Faible'
      case 'disconnected':
        return 'Déconnecté'
    }
  }

  return (
    <div className={`${styles.indicator} ${styles[quality]}`} title={getTooltip()}>
      <span className={styles.icon}>{getQualityIcon()}</span>
      <span className={styles.label}>{getQualityLabel()}</span>
    </div>
  )

  function getTooltip(): string {
    if (quality === 'disconnected') {
      return 'Pas de connexion'
    }

    const parts: string[] = []
    if (stats.rtt !== undefined) {
      parts.push(`RTT: ${stats.rtt.toFixed(0)}ms`)
    }
    if (stats.packetsLost !== undefined && stats.packetsLost > 0) {
      parts.push(`Paquets perdus: ${stats.packetsLost}`)
    }
    if (stats.jitter !== undefined) {
      parts.push(`Jitter: ${stats.jitter.toFixed(1)}ms`)
    }

    return parts.length > 0 ? parts.join(' | ') : getQualityLabel()
  }
}

export default ConnectionIndicator