'use client'

import { useQuery, gql } from '@apollo/client'
import { Search, Phone, Building, Calendar, ChevronLeft, ChevronRight, Loader2 } from 'lucide-react'
import React, { useState, useEffect, useMemo, useCallback } from 'react'

import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar'
import { Badge } from '@/components/ui/badge'
import { Button } from '@/components/ui/button'
import { Card, CardContent } from '@/components/ui/card'
import { Input } from '@/components/ui/input'

// GraphQL запрос для получения пользователей
const ALL_USERS = gql`
  query AllUsers($search: String, $limit: Int, $offset: Int) {
    allUsers(search: $search, limit: $limit, offset: $offset) {
      users {
        id
        phone
        managerName
        avatar
        createdAt
        updatedAt
        organization {
          id
          inn
          name
          fullName
          type
          status
          createdAt
        }
      }
      total
      hasMore
    }
  }
`

interface User {
  id: string
  phone: string
  managerName?: string
  avatar?: string
  createdAt: string
  updatedAt: string
  organization?: {
    id: string
    inn: string
    name?: string
    fullName?: string
    type: string
    status?: string
    createdAt: string
  }
}

const UsersSection = React.memo(() => {
  const [search, setSearch] = useState('')
  const [currentPage, setCurrentPage] = useState(1)
  const [searchQuery, setSearchQuery] = useState('')
  const limit = 20

  const { data, loading, error, refetch } = useQuery(ALL_USERS, {
    variables: {
      search: searchQuery || undefined,
      limit,
      offset: (currentPage - 1) * limit,
    },
    fetchPolicy: 'cache-and-network',
  })

  // Обновляем запрос при изменении поиска с дебаунсом
  useEffect(() => {
    const timer = setTimeout(() => {
      setSearchQuery(search)
      setCurrentPage(1) // Сбрасываем на первую страницу при поиске
    }, 500)

    return () => clearTimeout(timer)
  }, [search])

  const users = useMemo(() => data?.allUsers?.users || [], [data?.allUsers?.users])
  const total = useMemo(() => data?.allUsers?.total || 0, [data?.allUsers?.total])
  const _hasMore = useMemo(() => data?.allUsers?.hasMore || false, [data?.allUsers?.hasMore])
  const totalPages = useMemo(() => Math.ceil(total / limit), [total, limit])

  const getOrganizationTypeBadge = useCallback((type: string) => {
    const typeMap = {
      FULFILLMENT: { label: 'Фулфилмент', variant: 'default' as const },
      SELLER: { label: 'Селлер', variant: 'secondary' as const },
      LOGIST: { label: 'Логистика', variant: 'outline' as const },
      WHOLESALE: { label: 'Поставщик', variant: 'destructive' as const },
    }
    return typeMap[type as keyof typeof typeMap] || { label: type, variant: 'outline' as const }
  }, [])

  const formatDate = useCallback((dateString: string) => {
    try {
      const date = new Date(dateString)
      if (isNaN(date.getTime())) {
        return 'Неизвестно'
      }
      return date.toLocaleDateString('ru-RU', {
        day: '2-digit',
        month: '2-digit',
        year: 'numeric',
        hour: '2-digit',
        minute: '2-digit',
      })
    } catch {
      return 'Неизвестно'
    }
  }, [])

  const getInitials = useCallback((name?: string, phone?: string) => {
    if (name) {
      return name
        .split(' ')
        .map((n) => n[0])
        .join('')
        .toUpperCase()
        .slice(0, 2)
    }
    if (phone) {
      return phone.slice(-2)
    }
    return 'У'
  }, [])

  const handlePrevPage = useCallback(() => {
    if (currentPage > 1) {
      setCurrentPage(currentPage - 1)
    }
  }, [currentPage])

  const handleNextPage = useCallback(() => {
    if (currentPage < totalPages) {
      setCurrentPage(currentPage + 1)
    }
  }, [currentPage, totalPages])

  const handleSearchChange = useCallback((value: string) => {
    setSearch(value)
  }, [])

  if (error) {
    return (
      <div className="p-8">
        <div className="glass-card p-6 text-center">
          <p className="text-red-400">Ошибка загрузки пользователей: {error.message}</p>
          <Button onClick={() => refetch()} className="mt-4 glass-button">
            Попробовать снова
          </Button>
        </div>
      </div>
    )
  }

  return (
    <div className="p-8">
      <div className="mb-8">
        <h1 className="text-3xl font-bold text-white mb-2">Пользователи</h1>
        <p className="text-white/70">Управление пользователями системы</p>
      </div>

      {/* Поиск и статистика */}
      <div className="flex flex-col sm:flex-row gap-4 mb-6">
        <div className="flex-1 relative">
          <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-white/50 h-4 w-4" />
          <Input
            type="text"
            placeholder="Поиск по телефону, имени, ИНН организации..."
            value={search}
            onChange={(e) => handleSearchChange(e.target.value)}
            className="pl-10 glass-input text-white placeholder:text-white/50"
          />
        </div>
        <div className="flex items-center space-x-4 text-white/70 text-sm">
          <span>Всего: {total}</span>
          {searchQuery && <span>Найдено: {users.length}</span>}
        </div>
      </div>

      {/* Список пользователей */}
      {loading ? (
        <div className="glass-card p-8 text-center">
          <Loader2 className="h-8 w-8 animate-spin mx-auto mb-4 text-white/70" />
          <p className="text-white/70">Загрузка пользователей...</p>
        </div>
      ) : users.length === 0 ? (
        <div className="glass-card p-8 text-center">
          <p className="text-white/70">{searchQuery ? 'Пользователи не найдены' : 'Пользователи отсутствуют'}</p>
        </div>
      ) : (
        <div className="space-y-4">
          {users.map((user: User) => (
            <Card key={user.id} className="glass-card border-white/10 hover:border-white/20 transition-all">
              <CardContent className="p-6">
                <div className="flex items-start space-x-4">
                  {/* Аватар */}
                  <Avatar className="h-12 w-12 bg-white/20">
                    <AvatarImage src={user.avatar} />
                    <AvatarFallback className="bg-white/20 text-white text-sm font-semibold">
                      {getInitials(user.managerName, user.phone)}
                    </AvatarFallback>
                  </Avatar>

                  {/* Основная информация */}
                  <div className="flex-1 min-w-0">
                    <div className="flex items-start justify-between mb-2">
                      <div>
                        <h3 className="text-white font-medium">{user.managerName || 'Без имени'}</h3>
                        <div className="flex items-center text-white/70 text-sm mt-1">
                          <Phone className="h-3 w-3 mr-1" />
                          {user.phone}
                        </div>
                      </div>
                      <div className="text-right">
                        <div className="flex items-center text-white/70 text-sm">
                          <Calendar className="h-3 w-3 mr-1" />
                          {formatDate(user.createdAt)}
                        </div>
                      </div>
                    </div>

                    {/* Организация */}
                    {user.organization && (
                      <div className="bg-white/5 rounded-lg p-3 mt-3">
                        <div className="flex items-start justify-between">
                          <div className="flex-1 min-w-0">
                            <div className="flex items-center space-x-2 mb-1">
                              <Building className="h-4 w-4 text-white/70" />
                              <span className="text-white font-medium truncate">
                                {user.organization.name || user.organization.fullName || 'Без названия'}
                              </span>
                              <Badge {...getOrganizationTypeBadge(user.organization.type)}>
                                {getOrganizationTypeBadge(user.organization.type).label}
                              </Badge>
                            </div>
                            <p className="text-white/70 text-sm">ИНН: {user.organization.inn}</p>
                            {user.organization.status && (
                              <p className="text-white/60 text-xs">Статус: {user.organization.status}</p>
                            )}
                          </div>
                          <div className="text-right">
                            <p className="text-white/60 text-xs">
                              Зарегистрировано: {formatDate(user.organization.createdAt)}
                            </p>
                          </div>
                        </div>
                      </div>
                    )}
                  </div>
                </div>
              </CardContent>
            </Card>
          ))}
        </div>
      )}

      {/* Пагинация */}
      {totalPages > 1 && (
        <div className="flex items-center justify-between mt-8 pt-6 border-t border-white/10">
          <div className="text-white/70 text-sm">
            Страница {currentPage} из {totalPages}
          </div>
          <div className="flex space-x-2">
            <Button
              onClick={handlePrevPage}
              disabled={currentPage === 1}
              variant="ghost"
              className="glass-button text-white disabled:opacity-50"
            >
              <ChevronLeft className="h-4 w-4 mr-1" />
              Назад
            </Button>
            <Button
              onClick={handleNextPage}
              disabled={currentPage === totalPages}
              variant="ghost"
              className="glass-button text-white disabled:opacity-50"
            >
              Вперед
              <ChevronRight className="h-4 w-4 ml-1" />
            </Button>
          </div>
        </div>
      )}
    </div>
  )
})

UsersSection.displayName = 'UsersSection'

export { UsersSection }