'use client'

import React, { useState, useEffect } from 'react'
import { useRouter, useSearchParams } from 'next/navigation'
import Sidebar from '../../../components/ui/Sidebar'
import useNavigationStore from '../../store/navigationStore'
import DetectorList from '../../../components/alerts/DetectorList'
import AlertsList from '../../../components/alerts/AlertsList'
import ExportMenu from '../../../components/ui/ExportMenu'
import { useSession } from 'next-auth/react'

const AlertsPage: React.FC = () => {
  const router = useRouter()
  const searchParams = useSearchParams()
  const { currentObject, setCurrentObject, selectedDetector } = useNavigationStore()
  const [selectedDetectors, setSelectedDetectors] = useState<number[]>([])
  const { data: session } = useSession()

  type AlertItem = {
    id: number
    type: string
    message: string
    timestamp: string
    acknowledged: boolean
    priority: string
    detector_id?: string
    detector_name?: string
    location?: string
  }
  const [alerts, setAlerts] = useState<AlertItem[]>([])

  const urlObjectId = searchParams.get('objectId')
  const urlObjectTitle = searchParams.get('objectTitle')
  const objectId = currentObject.id || urlObjectId
  const objectTitle = currentObject.title || urlObjectTitle
  
  useEffect(() => {
    if (urlObjectId && urlObjectTitle && (!currentObject.id || currentObject.id !== urlObjectId)) {
      setCurrentObject(urlObjectId, urlObjectTitle)
    }
  }, [urlObjectId, urlObjectTitle, currentObject.id, setCurrentObject])

  // Auto-select detector when it comes from navigation store
  useEffect(() => {
    if (selectedDetector && !selectedDetectors.includes(selectedDetector.detector_id)) {
      setSelectedDetectors(prev => [...prev, selectedDetector.detector_id])
    }
  }, [selectedDetector, selectedDetectors])

  useEffect(() => {
    const loadAlerts = async () => {
      try {
        const params = new URLSearchParams()
        if (currentObject.id) params.set('objectId', currentObject.id)
        const res = await fetch(`/api/get-alerts?${params.toString()}`, { cache: 'no-store' })
        if (!res.ok) return
        const payload = await res.json()
        console.log('[AlertsPage] GET /api/get-alerts', {
          url: `/api/get-alerts?${params.toString()}`,
          status: res.status,
          payload,
        })
        const data = Array.isArray(payload?.data) ? payload.data : (payload?.data?.alerts || [])
        console.log('[AlertsPage] parsed alerts:', data)
        console.log('[AlertsPage] Sample alert structure:', data[0])
        console.log('[AlertsPage] Alerts with detector_id:', data.filter((alert: any) => alert.detector_id).length)
         
        console.log('[AlertsPage] using transformed alerts:', data)
        setAlerts(data)
      } catch (e) {
        console.error('Failed to load alerts:', e)
      }
    }
    loadAlerts()

  }, [currentObject.id])

  const handleBackClick = () => {
    router.push('/dashboard')
  }

  const handleDetectorSelect = (detectorId: number, selected: boolean) => {
    if (selected) {
      setSelectedDetectors(prev => [...prev, detectorId])
    } else {
      setSelectedDetectors(prev => prev.filter(id => id !== detectorId))
    }
  }

  const handleExport = async (format: 'csv' | 'pdf', hours: number) => {
    try {
      const res = await fetch(`/api/get-reports`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          ...(session?.accessToken ? { Authorization: `Bearer ${session.accessToken}` } : {}),
        },
        body: JSON.stringify({ format: format, hours }),
        credentials: 'include',
      })
      if (!res.ok) {
        const errText = await res.text()
        throw new Error(`Export failed: ${res.status} ${errText}`)
      }
      const blob = await res.blob()
      const contentDisposition = res.headers.get('Content-Disposition') || res.headers.get('content-disposition')
      const filenameMatch = contentDisposition?.match(/filename="(.+)"/)
      const timestamp = new Date().toISOString().replace(/[:.]/g, '-').replace(/T/g, '_')
      const filename = filenameMatch ? filenameMatch[1] : `alerts_report_${timestamp}.${format}`
      const url = window.URL.createObjectURL(blob)
      const link = document.createElement('a')
      link.href = url
      link.download = filename
      document.body.appendChild(link)
      link.click()
      document.body.removeChild(link)
      window.URL.revokeObjectURL(url)
    } catch (error) {
      console.error('Error:', error)
    }
  }

  const handleAcknowledgeToggle = async (alertId: number) => {
    try {
      const res = await fetch(`/api/update-alert/${alertId}`, { method: 'PATCH' })
      const payload = await res.json().catch(() => null)
      console.log('[AlertsPage] PATCH /api/update-alert', { id: alertId, status: res.status, payload })
      if (!res.ok) {
        throw new Error(typeof payload?.error === 'string' ? payload.error : `Update failed (${res.status})`)
      }
      // Обновить алерты
      const params = new URLSearchParams()
      if (currentObject.id) params.set('objectId', currentObject.id)
      const listRes = await fetch(`/api/get-alerts?${params.toString()}`, { cache: 'no-store' })
      const listPayload = await listRes.json().catch(() => null)
      const data = Array.isArray(listPayload?.data) ? listPayload.data : (listPayload?.data?.alerts || [])
      setAlerts(data as AlertItem[])
    } catch (e) {
      console.error('Failed to update alert:', e)
    }
  }

  return (
    <div className="flex h-screen bg-[#0e111a]"> 
      <Sidebar 
        activeItem={8} // История тревог 
      />
      
      <div className="flex-1 flex flex-col">
        <header className="bg-[#161824] border-b border-gray-700 px-6 py-4">
          <div className="flex items-center gap-4">
            <button 
              onClick={handleBackClick}
              className="text-gray-400 hover:text-white transition-colors"
              aria-label="Назад к дашборду"
            >
              <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
              </svg>
            </button>
            <nav className="flex items-center gap-2 text-sm">
              <span className="text-gray-400">Дашборд</span>
              <span className="text-gray-600">/</span>
              <span className="text-white">{objectTitle || 'Объект'}</span>
              <span className="text-gray-600">/</span>
              <span className="text-white">Уведомления</span>
            </nav>
          </div>
        </header>
        
        <div className="flex-1 p-6 overflow-auto">
          <div className="mb-6">
            <div className="flex items-center justify-between mb-6">
              <h1 className="text-white text-2xl font-semibold">Уведомления и тревоги</h1>
              
              <div className="flex items-center gap-4">
                {selectedDetectors.length > 0 && (
                  <span className="text-gray-300 text-sm">
                    Выбрано: <span className="text-white font-medium">{selectedDetectors.length}</span>
                  </span>
                )}
                
                <ExportMenu onExport={handleExport} />
              </div>
            </div>
            
            <DetectorList 
              objectId={objectId || undefined} 
              selectedDetectors={selectedDetectors}
              onDetectorSelect={handleDetectorSelect}
              initialSearchTerm={selectedDetector?.detector_id.toString() || ''}
            />
            {/* История тревог */}
            <div className="mt-8">
              <AlertsList 
                alerts={alerts}
                onAcknowledgeToggle={handleAcknowledgeToggle}
                initialSearchTerm={selectedDetector?.detector_id.toString() || ''}
              />
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}

export default AlertsPage