'use server'

import { createClient } from '@/lib/supabase/server'
import { createAdminClient } from '@/lib/supabase/admin'
import type { Order, EndCustomer, EndCustomerWithOrders, OrderWithRegisterName, FlattenedDevice, EndCustomerWithDevices, OrderItem } from '@/lib/types'

/**
 * Holt alle Bestellanfragen.
 * RLS filtert automatisch auf die eigene Firma (bzw. lässt Admins alle sehen).
 */
export async function getCompanyOrders(): Promise<Order[]> {
  const supabase = await createClient()

  const { data, error } = await supabase
    .from('orders')
    .select('*')
    .order('created_at', { ascending: false })

  if (error) throw error
  return data as Order[]
}

/**
 * Holt alle Endkunden.
 * RLS filtert automatisch auf die eigene Firma (bzw. lässt Admins alle sehen).
 */
export async function getCompanyEndCustomers(): Promise<EndCustomer[]> {
  const supabase = await createClient()

  const { data, error } = await supabase
    .from('end_customers')
    .select('*')
    .order('company_name', { ascending: true })

  if (error) throw error
  return data as EndCustomer[]
}

/**
 * Holt alle Endkunden inkl. ihrer Bestellungen/Kassen verschachtelt.
 * Extrahiert den Kassen-Namen aus order_data.items[0].device_name (Fallback "Kasse 1").
 * RLS filtert automatisch über get_auth_company_id().
 */
export async function getPartnerCustomersWithOrders(): Promise<EndCustomerWithOrders[]> {
  const supabase = await createClient()

  const { data, error } = await supabase
    .from('end_customers')
    .select('*, orders(*)')
    .order('company_name', { ascending: true })

  if (error) throw error

  return (data || []).map((customer: any) => {
    const rawOrders = customer.orders || []
    // Sort orders by created_at desc
    const sortedOrders = [...rawOrders].sort(
      (a, b) => new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
    )

    const orders: OrderWithRegisterName[] = sortedOrders.map((order: any) => {
      const items = order.order_data?.items || []
      const deviceName = items[0]?.device_name || 'Kasse 1'
      return {
        ...order,
        register_name: deviceName,
      }
    })

    return {
      ...customer,
      orders,
    }
  })
}

/**
 * Bereinigt Kassen-Präfixe aus Produkt- und Modulnamen.
 * Entfernt Muster wie "Kasse1:", "kass2:", "kasse 1:" etc.
 */
function stripDevicePrefix(name: string): string {
  return name.replace(/^kasse?\s*\d*\s*:\s*/i, '').trim()
}

/**
 * Holt alle Endkunden mit geflatteteten Kassen (eine Kasse = ein FlattenedDevice).
 * Jede Order wird nach device_name in einzelne Kassen aufgespalten.
 * RLS filtert automatisch über get_auth_company_id().
 */
export async function getPartnerCustomersWithDevices(): Promise<EndCustomerWithDevices[]> {
  const supabase = await createClient()

  const { data, error } = await supabase
    .from('end_customers')
    .select('*, orders(*)')
    .order('company_name', { ascending: true })

  if (error) throw error

  return (data || []).map((customer: any) => {
    const rawOrders = customer.orders || []
    const sortedOrders = [...rawOrders].sort(
      (a: any, b: any) => new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
    )

    const devices: FlattenedDevice[] = []

    for (const order of sortedOrders) {
      const allItems: OrderItem[] = order.order_data?.items || []
      const totalOrderPrice: number = order.total_price || 0

      // Gruppiere Items nach device_name
      const deviceGroups: Record<string, OrderItem[]> = {}
      for (const item of allItems) {
        const key = item.device_name || 'Kasse 1'
        if (!deviceGroups[key]) deviceGroups[key] = []
        deviceGroups[key].push(item)
      }

      const deviceKeys = Object.keys(deviceGroups)

      for (const deviceKey of deviceKeys) {
        const devItems = deviceGroups[deviceKey]

        // Bereinige Produkt- und Modulnamen
        const cleanedItems: OrderItem[] = devItems.map(item => ({
          ...item,
          product_name: stripDevicePrefix(item.product_name),
          selected_modules: (item.selected_modules || []).map(mod => ({
            ...mod,
            module_name: stripDevicePrefix(mod.module_name),
          })),
        }))

        // Anteiliger Preis dieser Kasse (gleichmäßige Aufteilung)
        const devicePrice = deviceKeys.length > 1
          ? totalOrderPrice / deviceKeys.length
          : totalOrderPrice

        devices.push({
          orderId: order.id,
          orderNumber: order.order_number,
          orderStatus: order.status,
          pdfUrl: order.pdf_url,
          createdAt: order.created_at,
          deviceId: deviceKey,
          deviceName: deviceKey,
          items: cleanedItems,
          totalPrice: Math.round(devicePrice * 100) / 100,
        })
      }
    }

    const { orders: _orders, ...customerWithoutOrders } = customer
    return {
      ...customerWithoutOrders,
      devices,
    } as EndCustomerWithDevices
  })
}

export interface GetCustomersForWizardParams {
  partnerCompanyId?: string
  page?: number
  pageSize?: number
  search?: string
}

export interface GetCustomersForWizardResult {
  customers: EndCustomer[]
  totalCount: number
  totalPages: number
  page: number
  pageSize: number
  isAdmin: boolean
}

/**
 * Server Action für den Neubestellung-Wizard:
 * Holt Endkunden rollenbasiert mit Partner-Filter (für Admins) und Pagination.
 */
export async function getCustomersForWizard(
  params: GetCustomersForWizardParams = {}
): Promise<GetCustomersForWizardResult> {
  const { partnerCompanyId, page = 1, pageSize = 10, search = '' } = params
  const supabase = await createClient()

  const {
    data: { user },
  } = await supabase.auth.getUser()

  if (!user) {
    throw new Error('Nicht authentifiziert')
  }

  const { data: dbUser } = await supabase
    .from('users')
    .select('role, company_id')
    .eq('id', user.id)
    .single()

  const isAdmin = dbUser?.role === 'admin'

  let client = supabase
  if (isAdmin) {
    try {
      client = createAdminClient() as any
    } catch {
      client = supabase
    }
  }

  let query = client
    .from('end_customers')
    .select('*', { count: 'exact' })
    .eq('is_anonymized', false)

  if (isAdmin) {
    if (partnerCompanyId && partnerCompanyId !== 'all' && partnerCompanyId !== '') {
      query = query.eq('partner_id', partnerCompanyId)
    }
  } else {
    if (dbUser?.company_id) {
      query = query.eq('partner_id', dbUser.company_id)
    }
  }

  if (search && search.trim() !== '') {
    const term = `%${search.trim()}%`
    query = query.or(
      `company_name.ilike.${term},first_name.ilike.${term},last_name.ilike.${term},city.ilike.${term},zip.ilike.${term}`
    )
  }

  query = query.order('company_name', { ascending: true })

  const validPageSize = [10, 20, 50].includes(pageSize) ? pageSize : 10
  const validPage = Math.max(1, page)
  const from = (validPage - 1) * validPageSize
  const to = from + validPageSize - 1

  query = query.range(from, to)

  const { data, error, count } = await query

  if (error) {
    throw error
  }

  const totalCount = count ?? 0
  const totalPages = Math.ceil(totalCount / validPageSize) || 1

  return {
    customers: (data as EndCustomer[]) || [],
    totalCount,
    totalPages,
    page: validPage,
    pageSize: validPageSize,
    isAdmin,
  }
}