import { ref, computed, reactive, nextTick } from 'vue'
import type {
  WebSocketMessage,
  ConnectionState,
  WebSocketConfig,
  MessageHistory,
  ConnectionStats,
  MonitoringData,
  ClientInfo,
  OnlineUser,
  ActivityLog
} from '../types/websocket'

export const useWebSocket = () => {
  // Check if we're in browser environment
  const isBrowser = process.client

  const ws = ref<WebSocket | null>(null)
  const isConnected = ref(false)
  const isConnecting = ref(false)
  const connectionStatus = ref<'disconnected' | 'connecting' | 'connected' | 'error'>('disconnected')

  const connectionState = reactive<ConnectionState>({
    isConnected: false,
    isConnecting: false,
    connectionStatus: 'disconnected',
    clientId: null,
    staticId: null,
    currentRoom: null,
    userId: 'anonymous',
    ipAddress: null,
    connectionStartTime: null,
    lastPingTime: null,
    connectionLatency: 0,
    connectionHealth: 'poor',
    reconnectAttempts: 0,
    messagesReceived: 0,
    messagesSent: 0,
    uptime: '00:00:00'
  })

  const config = reactive<WebSocketConfig>({
    wsUrl: 'ws://localhost:8080/api/v1/ws',
    userId: 'anonymous',
    room: 'default',
    staticId: '',
    useIPBasedId: false,
    autoReconnect: true,
    heartbeatEnabled: true,
    maxReconnectAttempts: 10,
    reconnectDelay: 1000,
    maxReconnectDelay: 30000,
    heartbeatInterval: 30000,
    heartbeatTimeout: 5000,
    maxMissedHeartbeats: 3,
    maxMessages: 1000,
    messageWarningThreshold: 800,
    actionThrottle: 100
  })

  const messages = ref<MessageHistory[]>([])
  const stats = ref<ConnectionStats | null>(null)
  const monitoringData = ref<MonitoringData | null>(null)
  const onlineUsers = ref<OnlineUser[]>([])
  const activityLog = ref<ActivityLog[]>([])

  let reconnectTimeout: number | null = null
  let heartbeatInterval: number | null = null
  let heartbeatTimeout: number | null = null
  let missedHeartbeats = 0
  let lastHeartbeatTime = 0
  let messageCount = 0

  // Only run WebSocket logic in browser
  if (isBrowser) {
    // WebSocket connection logic here
  }

  const addMessage = (type: string, data: any, messageId?: string) => {
    if (!isBrowser) return

    const message: MessageHistory = {
      timestamp: new Date(),
      type,
      data,
      messageId,
      size: JSON.stringify(data).length
    }

    messages.value.unshift(message)
    messageCount++

    // Keep only the last maxMessages
    if (messages.value.length > config.maxMessages) {
      messages.value = messages.value.slice(0, config.maxMessages)
    }

    // Update connection state
    connectionState.messagesReceived++
  }

  const connectionHealthColor = computed(() => {
    switch (connectionState.connectionHealth) {
      case 'excellent': return '#4CAF50'
      case 'good': return '#2196F3'
      case 'warning': return '#FFC107'
      case 'poor': return '#F44336'
      default: return '#9E9E9E'
    }
  })

  const connectionHealthText = computed(() => {
    switch (connectionState.connectionHealth) {
      case 'excellent': return 'Excellent'
      case 'good': return 'Good'
      case 'warning': return 'Warning'
      case 'poor': return 'Poor'
      default: return 'Unknown'
    }
  })

  // Admin functionality
  const serverInfo = ref<any>(null)
  const systemHealth = ref<any>(null)

  const executeAdminCommand = async (command: string, params: any) => {
    if (!isBrowser || !ws.value) throw new Error('Not connected')

    const message = {
      type: 'admin_command',
      command,
      params,
      timestamp: Date.now()
    }

    ws.value.send(JSON.stringify(message))
    return { success: true, message: 'Command sent successfully' }
  }

  const getServerInfo = async () => {
    if (!isBrowser || !ws.value) throw new Error('Not connected')

    const message = {
      type: 'get_server_info',
      timestamp: Date.now()
    }

    ws.value.send(JSON.stringify(message))
  }

  const getSystemHealth = async () => {
    if (!isBrowser || !ws.value) throw new Error('Not connected')

    const message = {
      type: 'get_system_health',
      timestamp: Date.now()
    }

    ws.value.send(JSON.stringify(message))
  }

  // Cleanup on unmount
  const cleanup = () => {
    if (!isBrowser) return

    disconnect()
    if (reconnectTimeout) {
      clearTimeout(reconnectTimeout)
    }
    stopHeartbeat()
  }

  // WebSocket connection methods (only available in browser)
  const connect = () => {
    if (!isBrowser) return
    // WebSocket connection logic
  }

  const disconnect = () => {
    if (!isBrowser) return
    // WebSocket disconnection logic
  }

  const sendMessage = (message: any) => {
    if (!isBrowser || !ws.value) return
    // Send message logic
  }

  const broadcastMessage = (message: string) => {
    if (!isBrowser || !ws.value) return
    // Broadcast message logic
  }

  const sendDirectMessage = (clientId: string, message: string) => {
    if (!isBrowser || !ws.value) return
    // Direct message logic
  }

  const sendRoomMessage = (room: string, message: string) => {
    if (!isBrowser || !ws.value) return
    // Room message logic
  }

  const getOnlineUsers = () => {
    if (!isBrowser || !ws.value) return
    // Get online users logic
  }

  const testConnection = () => {
    if (!isBrowser || !ws.value) return
    // Test connection logic
  }

  const sendHeartbeat = () => {
    if (!isBrowser || !ws.value) return
    // Send heartbeat logic
  }

  const executeDatabaseQuery = async (query: string) => {
    if (!isBrowser || !ws.value) return
    // Database query logic
  }

  const triggerNotification = async (message: string) => {
    if (!isBrowser || !ws.value) return
    // Notification logic
  }

  const getStats = () => {
    if (!isBrowser || !ws.value) return
    // Get stats logic
  }

  const getMonitoringData = () => {
    if (!isBrowser || !ws.value) return
    // Get monitoring data logic
  }

  const clearMessages = () => {
    if (!isBrowser) return
    messages.value = []
    messageCount = 0
  }

  const clearActivityLog = () => {
    if (!isBrowser) return
    activityLog.value = []
  }

  const getMessagesByType = (type: string) => {
    return messages.value.filter(msg => msg.type === type)
  }

  const getRecentMessages = (count: number = 10) => {
    return messages.value.slice(0, count)
  }

  const stopHeartbeat = () => {
    if (!isBrowser) return
    // Stop heartbeat logic
  }

  const isMessageLimitReached = computed(() => {
    return messages.value.length >= config.maxMessages
  })

  const shouldShowMessageWarning = computed(() => {
    return messages.value.length >= config.messageWarningThreshold
  })

  return {
    // State
    ws,
    isConnected,
    isConnecting,
    connectionStatus,
    connectionState,
    config,
    messages,
    stats,
    monitoringData,
    onlineUsers,
    activityLog,

    // Admin state
    serverInfo,
    systemHealth,

    // Methods
    connect,
    disconnect,
    sendMessage,
    broadcastMessage,
    sendDirectMessage,
    sendRoomMessage,
    getServerInfo,
    getOnlineUsers,
    testConnection,
    sendHeartbeat,
    executeDatabaseQuery,
    triggerNotification,
    getStats,
    getMonitoringData,
    executeAdminCommand,
    getSystemHealth,
    clearMessages,
    clearActivityLog,
    getMessagesByType,
    getRecentMessages,
    cleanup,

    // Computed
    isMessageLimitReached,
    shouldShowMessageWarning,
    connectionHealthColor,
    connectionHealthText
  }
}
