import { computed, inject, provide, reactive, ref, type InjectionKey } from 'vue'
import { useRouter } from 'vue-router'
import { companies, orders as initialOrders } from '@/data/mockData'
import { generateOrderNumber } from '@/utils/format'
import type { Order, SettlementMethod } from '@/types'

import { useToast } from '@/composables/useToast'

export function useOrdersPage() {
  const router = useRouter()
  const toast = useToast()

  const orderList = ref<Order[]>([...initialOrders])
  const activeTab = ref('all')
  const selectedOrderId = ref<string>('')
  const searchQuery = ref('')
  const showAddModal = ref(false)
  const showDetailPanel = ref(false)
  const showDetailModal = ref(false)
  const formError = ref('')

  const emptyForm = () => ({
    customerName: '',
    companyId: companies[0]?.id ?? '',
    settlementMethod: 'check' as SettlementMethod,
    meterage: 1000,
    customerPhone: '',
  })

  const form = reactive(emptyForm())

  const isFormValid = computed(
    () => form.customerName.trim().length > 0 && form.companyId.length > 0,
  )

  const filteredOrders = computed(() => {
    let list = orderList.value
    if (activeTab.value !== 'all') {
      list = list.filter((o) => o.status === activeTab.value)
    }
    if (searchQuery.value.trim()) {
      const q = searchQuery.value.trim()
      list = list.filter(
        (o) => o.orderNumber.includes(q) || o.customerName.includes(q),
      )
    }
    return list
  })

  const selectedOrder = computed(() =>
    orderList.value.find((o) => o.id === selectedOrderId.value) ?? null,
  )

  function selectOrder(order: Order, openDetail = false) {
    selectedOrderId.value = order.id
    if (openDetail) {
      showDetailPanel.value = true
    }
  }

  function openOrderDetail(order: Order) {
    selectedOrderId.value = order.id
    showDetailModal.value = true
  }

  function closeDetailPanel() {
    showDetailPanel.value = false
  }

  function closeDetailModal() {
    showDetailModal.value = false
  }

  function settlementLabel(method: string) {
    return method === 'check' ? 'چکی' : 'نقدی'
  }

  function goPricing(order: Order) {
    router.push(`/orders/${order.id}/pricing`)
  }

  function goChecks(order: Order) {
    router.push(`/orders/${order.id}/checks`)
  }

  function openAddModal() {
    Object.assign(form, emptyForm())
    formError.value = ''
    showAddModal.value = true
  }

  function closeAddModal() {
    showAddModal.value = false
    formError.value = ''
  }

  function submitAddOrder() {
    if (!isFormValid.value) {
      formError.value = 'نام مشتری و شرکت الزامی هستند.'
      return
    }

    const company = companies.find((c) => c.id === form.companyId)
    const newOrder: Order = {
      id: `ord-${crypto.randomUUID().slice(0, 8)}`,
      orderNumber: generateOrderNumber(),
      customerName: form.customerName.trim(),
      companyName: company?.name ?? '—',
      companyId: form.companyId,
      settlementMethod: form.settlementMethod,
      totalAmount: null,
      meterage: form.meterage,
      status: 'pending_review',
      createdAt: new Date().toISOString(),
      customerPhone: form.customerPhone.trim() || undefined,
      items: [],
    }

    orderList.value.unshift(newOrder)
    selectedOrderId.value = newOrder.id
    toast.success('سفارش جدید ثبت شد.')
    closeAddModal()
  }

  return {
    companies,
    orderList,
    activeTab,
    selectedOrderId,
    searchQuery,
    showAddModal,
    showDetailPanel,
    showDetailModal,
    formError,
    form,
    isFormValid,
    filteredOrders,
    selectedOrder,
    selectOrder,
    openOrderDetail,
    closeDetailPanel,
    closeDetailModal,
    settlementLabel,
    goPricing,
    goChecks,
    openAddModal,
    closeAddModal,
    submitAddOrder,
  }
}

export type OrdersPageContext = ReturnType<typeof useOrdersPage>

export const ORDERS_PAGE_KEY: InjectionKey<OrdersPageContext> = Symbol('orders-page')

export function provideOrdersPage() {
  const ctx = useOrdersPage()
  provide(ORDERS_PAGE_KEY, ctx)
  return ctx
}

export function useOrdersPageContext() {
  const ctx = inject(ORDERS_PAGE_KEY)
  if (!ctx) throw new Error('Orders page context is missing')
  return ctx
}