/**
 * SAAP Agent Store - Pinia State Management
 * Centralized state management for SAAP agent operations
 */

import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import saapApi, { saapWebSocket } from '@/services/saapApi'

export const useAgentStore = defineStore('agents', () => {
  // ==========================================
  // STATE
  // ==========================================
  
  const agents = ref([])
  const isLoading = ref(false)
  const isConnected = ref(false)
  const error = ref(null)
  const systemInfo = ref(null)
  const lastUpdate = ref(null)

  // Agent-specific loading states
  const agentLoading = ref(new Map())

  // Chat messages storage
  const chatMessages = ref(new Map())

  // ==========================================
  // GETTERS (Computed)
  // ==========================================

  const activeAgents = computed(() => 
    agents.value.filter(agent => agent.status === 'active')
  )

  const inactiveAgents = computed(() =>
    agents.value.filter(agent => agent.status === 'inactive')
  )

  const startingAgents = computed(() =>
    agents.value.filter(agent => agent.status === 'starting')
  )

  const errorAgents = computed(() =>
    agents.value.filter(agent => agent.status === 'error')
  )

  const totalAgents = computed(() => agents.value.length)

  const agentById = computed(() => (id) => 
    agents.value.find(agent => agent.id === id)
  )

  const connectionStatus = computed(() => ({
    isConnected: isConnected.value,
    status: isConnected.value ? 'connected' : 'disconnected',
    className: isConnected.value ? 'status-connected' : 'status-disconnected',
    text: isConnected.value ? 'Connected' : 'Disconnected'
  }))

  // Agent statistics
  const agentStats = computed(() => ({
    total: totalAgents.value,
    active: activeAgents.value.length,
    inactive: inactiveAgents.value.length,
    starting: startingAgents.value.length,
    error: errorAgents.value.length
  }))

  // ==========================================
  // ACTIONS
  // ==========================================

  /**
   * Initialize store and WebSocket connection
   */
  async function initialize() {
    console.log('🚀 Initializing SAAP Agent Store...')
    
    try {
      // Setup WebSocket listeners
      setupWebSocketListeners()
      
      // Connect to WebSocket
      saapWebSocket.connect()
      
      // Load initial data
      await Promise.all([
        loadAgents(),
        loadSystemInfo()
      ])
      
      console.log('✅ SAAP Agent Store initialized successfully')
      
    } catch (err) {
      console.error('❌ Store initialization failed:', err)
      setError('Failed to initialize SAAP Platform')
    }
  }

  /**
   * Setup WebSocket event listeners
   */
  function setupWebSocketListeners() {
    saapWebSocket.on('connected', () => {
      console.log('✅ WebSocket connected')
      isConnected.value = true
      clearError()
    })

    saapWebSocket.on('disconnected', () => {
      console.log('🔌 WebSocket disconnected')
      isConnected.value = false
    })

    saapWebSocket.on('error', (error) => {
      console.error('❌ WebSocket error:', error)
      isConnected.value = false
      setError('WebSocket connection failed')
    })

    saapWebSocket.on('message', (data) => {
      handleWebSocketMessage(data)
    })
  }

  /**
   * Handle incoming WebSocket messages
   */
  function handleWebSocketMessage(data) {
    console.log('📨 Processing WebSocket message:', data)
    
    // Handle different message types
    if (typeof data === 'string') {
      // Handle echo messages or simple strings
      console.log('Echo received:', data)
    } else if (data && data.type) {
      // Handle structured messages
      switch (data.type) {
        case 'agent_update':
          updateAgentFromWebSocket(data.agent)
          break
        case 'agent_status':
          updateAgentStatus(data.agent_id, data.status)
          break
        case 'chat_message':
          addChatMessage(data.agent_id, data.message, data.response)
          break
        default:
          console.log('Unknown message type:', data.type)
      }
    }
  }

  /**
   * Load all agents from API
   */
  async function loadAgents() {
    setLoading(true)
    try {
      const response = await saapApi.getAgents()
      agents.value = Array.isArray(response) ? response : []
      lastUpdate.value = new Date().toISOString()
      console.log(`📋 Loaded ${agents.value.length} agents`)
      clearError()
    } catch (err) {
      console.error('❌ Failed to load agents:', err)
      setError('Failed to load agents')
      agents.value = []
    } finally {
      setLoading(false)
    }
  }

  /**
   * Load system information
   */
  async function loadSystemInfo() {
    try {
      const info = await saapApi.getSystemInfo()
      systemInfo.value = info
      console.log('📊 System info loaded:', info)
    } catch (err) {
      console.error('❌ Failed to load system info:', err)
      setError('Failed to load system information')
    }
  }

  /**
   * Start an agent
   */
  async function startAgent(agentId) {
    setAgentLoading(agentId, true)
    try {
      const response = await saapApi.startAgent(agentId)
      console.log(`▶️ Agent ${agentId} started:`, response)
      
      // Update local state
      updateAgentStatus(agentId, 'starting')
      
      // Reload agents to get updated state
      setTimeout(() => loadAgents(), 1000)
      
      return response
    } catch (err) {
      console.error(`❌ Failed to start agent ${agentId}:`, err)
      setError(`Failed to start agent: ${agentId}`)
      throw err
    } finally {
      setAgentLoading(agentId, false)
    }
  }

  /**
   * Stop an agent
   */
  async function stopAgent(agentId) {
    setAgentLoading(agentId, true)
    try {
      const response = await saapApi.stopAgent(agentId)
      console.log(`⏹️ Agent ${agentId} stopped:`, response)
      
      // Update local state
      updateAgentStatus(agentId, 'inactive')
      
      return response
    } catch (err) {
      console.error(`❌ Failed to stop agent ${agentId}:`, err)
      setError(`Failed to stop agent: ${agentId}`)
      throw err
    } finally {
      setAgentLoading(agentId, false)
    }
  }

  /**
   * Send message to agent
   */
  async function chatWithAgent(agentId, message) {
    setAgentLoading(agentId, true)
    try {
      const response = await saapApi.chatWithAgent(agentId, message)
      console.log(`💬 Chat with ${agentId}:`, response)
      
      // Store chat message
      addChatMessage(agentId, message, response.response)
      
      return response
    } catch (err) {
      console.error(`❌ Failed to chat with agent ${agentId}:`, err)
      setError(`Failed to communicate with agent: ${agentId}`)
      throw err
    } finally {
      setAgentLoading(agentId, false)
    }
  }

  /**
   * Create agent from template
   */
  async function createAgentFromTemplate(templateName) {
    setLoading(true)
    try {
      const response = await saapApi.createAgentFromTemplate(templateName)
      console.log(`✨ Agent created from template ${templateName}:`, response)
      
      // Reload agents
      await loadAgents()
      
      return response
    } catch (err) {
      console.error(`❌ Failed to create agent from template ${templateName}:`, err)
      setError(`Failed to create agent from template: ${templateName}`)
      throw err
    } finally {
      setLoading(false)
    }
  }

  // ==========================================
  // HELPER FUNCTIONS
  // ==========================================

  /**
   * Update agent status
   */
  function updateAgentStatus(agentId, status) {
    const agent = agents.value.find(a => a.id === agentId)
    if (agent) {
      agent.status = status
      console.log(`🔄 Agent ${agentId} status updated to: ${status}`)
    }
  }

  /**
   * Update agent from WebSocket message
   */
  function updateAgentFromWebSocket(agentData) {
    const index = agents.value.findIndex(a => a.id === agentData.id)
    if (index !== -1) {
      agents.value[index] = { ...agents.value[index], ...agentData }
      console.log(`🔄 Agent ${agentData.id} updated from WebSocket`)
    }
  }

  /**
   * Add chat message to history
   */
  function addChatMessage(agentId, message, response) {
    if (!chatMessages.value.has(agentId)) {
      chatMessages.value.set(agentId, [])
    }
    
    const messages = chatMessages.value.get(agentId)
    messages.push({
      id: Date.now(),
      user_message: message,
      agent_response: response?.content || response,
      timestamp: new Date().toISOString()
    })
    
    // Keep only last 100 messages per agent
    if (messages.length > 100) {
      messages.splice(0, messages.length - 100)
    }
  }

  /**
   * Set loading state
   */
  function setLoading(loading) {
    isLoading.value = loading
  }

  /**
   * Set agent-specific loading state
   */
  function setAgentLoading(agentId, loading) {
    agentLoading.value.set(agentId, loading)
  }

  /**
   * Check if agent is loading
   */
  function isAgentLoading(agentId) {
    return agentLoading.value.get(agentId) || false
  }

  /**
   * Set error state
   */
  function setError(errorMessage) {
    error.value = errorMessage
    console.error('Store Error:', errorMessage)
  }

  /**
   * Clear error state
   */
  function clearError() {
    error.value = null
  }

  /**
   * Get chat messages for agent
   */
  function getChatMessages(agentId) {
    return chatMessages.value.get(agentId) || []
  }

  /**
   * Refresh all data
   */
  async function refresh() {
    await Promise.all([
      loadAgents(),
      loadSystemInfo()
    ])
  }

  /**
   * Cleanup store (disconnect WebSocket)
   */
  function cleanup() {
    console.log('🧹 Cleaning up SAAP Agent Store...')
    saapWebSocket.disconnect()
    isConnected.value = false
  }

  // ==========================================
  // RETURN STORE INTERFACE
  // ==========================================

  return {
    // State
    agents,
    isLoading,
    isConnected,
    error,
    systemInfo,
    lastUpdate,

    // Getters
    activeAgents,
    inactiveAgents,
    startingAgents,
    errorAgents,
    totalAgents,
    agentById,
    connectionStatus,
    agentStats,

    // Actions
    initialize,
    loadAgents,
    loadSystemInfo,
    startAgent,
    stopAgent,
    chatWithAgent,
    createAgentFromTemplate,
    refresh,
    cleanup,

    // Helper functions
    isAgentLoading,
    getChatMessages,
    clearError
  }
})