import { produce } from 'immer'
import _ from 'lodash'

export default function appBatchToApiBatch (params: ISubmitBatchParams): IOrderBatchRequestData {
  const {
    orderBatch,
    deliveryType,
    payment,
    shipping,
    takeawayInfo = {},
    ignoreUnavailable = false,
    needTableware,
    lastSubOrder,
    promoCode,
    riceCoin,
    from,
  } = params
  const data: IOrderBatchRequestData = {
    batchID: orderBatch.id,
    items: toBatchRequestItems(orderBatch.items),
    remark: orderBatch.remark,
    ignoreUnavailable: ignoreUnavailable,
    takeout: orderBatch.takeout,
    deliveryType: deliveryType,
    payment: payment,
    shipping: shipping,
    needTableware: needTableware ?? deliveryType !== 'table',
    takeawayInfo: takeawayInfo,
    promoCode: promoCode,
    riceCoin: riceCoin,
    from,
  }

  if (deliveryType === 'storeDelivery') {
    data.takeawayInfo = takeawayInfo
  }

  if (lastSubOrder != null) {
    data.lastSubOrder = lastSubOrder
  }

  return data
}

function toBatchRequestItems (batchItems: IAppBatchItem[]): IOrderBatchRequestItem[] {
  const formatedItems: IOrderBatchRequestItem[] = []

  // 全部 batch 共用 index，所以要重新編排 setMenuIndex
  // 原本的 setMenuIndex 會加上這個 setIndex
  let setIndex = 0
  batchItems.forEach(batchItem => {
    const isSet = batchItem.setItems != null && batchItem.setItems.length > 0
    const mainBatchItem: IOrderBatchRequestItem = {
      menuID: batchItem.menuId, // 套餐的餐點自己的 id
      setID: batchItem.setId != null ? batchItem.setId : undefined, // 套餐的餐點原本的 id
      setMenuID: batchItem.setMenuId != null ? batchItem.setMenuId : null, // 套餐的餐點原本的 id
      setMenuIndex: null,
      setName: isSet ? batchItem.name : undefined,
      name: batchItem.name,
      desc: batchItem.desc != null ? batchItem.desc : '',
      price: batchItem.price,
      discount: batchItem.discount,
      modifiers: batchItem.modifiers,
      divisor: batchItem.divisor,
      options: batchItem.options.map(option => {
        return {
          optionID: option.optionItemId,
          name: option.name,
          price: option.price,
          quantity: option.quantity,
        }
      }),
      tags: batchItem.tags,
      remarks: batchItem.remarks,
      isSet: false,
    }

    if (isSet) {
      // 套餐
      // 重新設定 setMenuIndex (setItem is read only, so use produce)
      const setItems = produce(batchItem.setItems, (setItems) => {
        setItems.forEach(setItem => {
          if (setItem.setMenuIndex === null) {
            // 未分組的 setMenuItemIndex 設為 0
            setItem.setMenuIndex = 0 + setIndex
          } else {
            setItem.setMenuIndex += setIndex
          }
        })
      })

      const setGroups: { [setMenuIndex: number]: IAppBatchItem[] } = _.groupBy(setItems, 'setMenuIndex')

      // 加入 setItems with same setMenuIndex
      _.forEach(setGroups, (setGroupItems, setMenuIndex) => {
        // 加入相同 setMenuIndex 的 main item
        formatedItems.push({
          ...mainBatchItem,
          setMenuIndex: Number(setMenuIndex),
          isSet: true,
        })

        setGroupItems.forEach(setItem => {
          const setBatchItem: IOrderBatchRequestItem = {
            menuID: setItem.menuId, // 套餐的餐點自己的 id
            setMenuID: setItem.setMenuId as string, // 套餐的餐點原本的 id
            setMenuIndex: Number(setMenuIndex),
            setName: mainBatchItem.setName,
            name: setItem.name,
            desc: setItem.desc != null ? setItem.desc : '',
            price: setItem.price,
            discount: setItem.discount,
            modifiers: setItem.modifiers,
            options: setItem.options.map(option => {
              return {
                optionID: option.optionItemId,
                name: option.name,
                price: option.price,
                quantity: option.quantity,
              }
            }),
            tags: setItem.tags,
            remarks: setItem.remarks,
            isSet: false,
          }
          Array(setItem.quantity).fill(0).forEach(() => {
            // 有幾個 quantity 就要 push 幾次
            formatedItems.push(setBatchItem)
          })
        })
      })
      // 有幾個 quantity 就會用掉幾個 setIndex
      setIndex += batchItem.quantity
    } else {
      // 單點，有幾個 quantity 就 push 幾次
      Array(batchItem.quantity).fill(0).forEach(() => {
        formatedItems.push(mainBatchItem)
      })
    }
  })

  return formatedItems
}