import { computed, ref } from 'vue'
import { showToast, useDidShow } from '@tarojs/taro'
import { createOrder } from '@/services'
import { pinia, useAppStore, useCartStore, useCustomerStore, useFulfillmentStore } from '@/stores'
import { FulfillmentScenes } from '@/shared'
import { openRoute } from '@/utils/router'
import { createEstimateActions, emptyEstimate } from './checkout-page/estimate-actions'
import { buildCheckoutPayload } from './checkout-page/payload'
import {
  resolveSceneHint,
  resolveSceneLabel,
  resolveSceneSuffix
} from './checkout-page/scene-helpers'

interface InputLikeEvent {
  detail?: {
    value?: string
  }
}

export function useCheckoutPage () {
  const appStore = useAppStore(pinia)
  const cartStore = useCartStore(pinia)
  const customerStore = useCustomerStore(pinia)
  const fulfillmentStore = useFulfillmentStore(pinia)
  const isEstimating = ref(false)
  const submitting = ref(false)
  const estimate = ref(emptyEstimate)
  const draftName = ref(customerStore.name)
  const draftPhone = ref(customerStore.phone)
  const remark = ref('')

  const itemCount = computed(() => cartStore.itemCount)
  const lineList = computed(() => cartStore.lineList)
  const sceneLabel = computed(() => resolveSceneLabel(appStore.scene))
  const sceneSuffix = computed(() => resolveSceneSuffix(appStore.scene))
  const sceneHint = computed(() => resolveSceneHint(appStore.scene))

  const { handleEstimate } = createEstimateActions({
    appStore,
    cartStore,
    estimate,
    isEstimating
  })

  function handleNameInput (event: InputLikeEvent) {
    draftName.value = event.detail?.value || ''
  }

  function handlePhoneInput (event: InputLikeEvent) {
    draftPhone.value = event.detail?.value || ''
  }

  function handleRemarkInput (event: InputLikeEvent) {
    remark.value = event.detail?.value || ''
  }

  async function submitOrder () {
    if (!cartStore.itemCount) {
      await showToast({ title: '请先加购商品', icon: 'none' })
      return
    }

    if (!draftName.value.trim() || !draftPhone.value.trim()) {
      await showToast({ title: '请完善顾客信息', icon: 'none' })
      return
    }

    if (appStore.scene === FulfillmentScenes.Delivery && !fulfillmentStore.addressText) {
      await showToast({ title: '请先填写配送地址', icon: 'none' })
      void openRoute('/pages/address/index')
      return
    }

    if (appStore.scene === FulfillmentScenes.DineIn && !fulfillmentStore.tableNo) {
      await showToast({ title: '请先填写桌号', icon: 'none' })
      void openRoute('/pages/dinein/confirm/index')
      return
    }

    customerStore.updateProfile({
      name: draftName.value,
      phone: draftPhone.value
    })

    submitting.value = true

    try {
      await handleEstimate()
      const order = await createOrder({
        ...buildCheckoutPayload(appStore, cartStore),
        remark: remark.value || (appStore.scene === FulfillmentScenes.Delivery
          ? fulfillmentStore.addressText
          : undefined),
        tableNo: appStore.scene === FulfillmentScenes.DineIn
          ? fulfillmentStore.tableNo
          : undefined
      })

      cartStore.clear()
      void openRoute(`/pages/trade/success/index?orderId=${order.orderId}&orderNo=${order.orderNo}`)
    } catch (error: unknown) {
      await showToast({
        title: error instanceof Error ? error.message : '下单失败',
        icon: 'none'
      })
    } finally {
      submitting.value = false
    }
  }

  function goSceneContext () {
    if (appStore.scene === FulfillmentScenes.Delivery) {
      void openRoute('/pages/address/index')
      return
    }

    if (appStore.scene === FulfillmentScenes.DineIn) {
      void openRoute('/pages/dinein/confirm/index')
      return
    }

    void showToast({ title: '自提场景无需额外填写', icon: 'none' })
  }

  function goMenu () {
    void openRoute('/pages/menu/index')
  }

  useDidShow(() => {
    draftName.value = customerStore.name
    draftPhone.value = customerStore.phone
    void appStore.initBootstrap()
    void appStore.initStores()
    void handleEstimate()
  })

  return {
    appStore,
    draftName,
    draftPhone,
    estimate,
    fulfillmentStore,
    goMenu,
    goSceneContext,
    handleEstimate,
    handleNameInput,
    handlePhoneInput,
    handleRemarkInput,
    itemCount,
    lineList,
    remark,
    sceneHint,
    sceneLabel,
    sceneSuffix,
    submitOrder,
    submitting
  }
}