import type { Ref } from 'vue'

import type { PharmacyItem } from '@/services/modules/task/entitySelector/type'
import { getListDrugTableApi } from '@/services/modules/task/taskFrom/index'

import type {
  DynamicFormFieldValue,
  DynamicFormState,
  FieldValue,
  TaskFieldConfigViewItem,
  TaskFieldOption,
} from './useTaskForm'

export interface SingleSelectChangeEvent {
  previousValue: FieldValue
  value: string
  label: string
  selectedItem: TaskFieldOption
}

interface UseTaskSelectHandlersOptions {
  taskTypeId: Ref<string>
  form: Ref<DynamicFormState>
  taskFieldConfigList: Ref<TaskFieldConfigViewItem[]>
}

/**
 * 动态表单选择器业务处理。
 *
 * 统一处理：
 * 1. 单选打开前逻辑
 * 2. 单选值变化逻辑
 * 3. 多选打开前逻辑
 * 4. 字段查找
 * 5. 表单值读取和修改
 * 6. 字段 options 修改
 */
export const useTaskSelectHandlers = ({
  taskTypeId,
  form,
  taskFieldConfigList,
}: UseTaskSelectHandlersOptions) => {
  /**
   * 根据 alias 查找字段配置。
   */
  const findFieldByAlias = (alias: string): TaskFieldConfigViewItem | undefined => {
    return taskFieldConfigList.value.find((item) => item.alias === alias)
  }

  /**
   * 根据字段配置获取对应表单值。
   */
  const getFieldFormValue = (field: TaskFieldConfigViewItem): DynamicFormFieldValue | undefined => {
    return form.value.value[field.id]
  }

  /**
   * 根据 alias 获取对应表单值。
   */
  const getFieldFormValueByAlias = (alias: string): DynamicFormFieldValue | undefined => {
    const field = findFieldByAlias(alias)

    if (!field) {
      return undefined
    }

    return getFieldFormValue(field)
  }

  /**
   * 根据 alias 获取字段实际 value。
   */
  const getFieldValueByAlias = (alias: string): FieldValue => {
    return getFieldFormValueByAlias(alias)?.value
  }

  /**
   * 更新指定字段的表单值。
   */
  const setFieldFormValue = (
    field: TaskFieldConfigViewItem,
    fieldValue: Partial<DynamicFormFieldValue>
  ) => {
    const currentValue = getFieldFormValue(field)

    if (!currentValue) {
      return
    }

    if (fieldValue.label !== undefined) {
      currentValue.label = fieldValue.label
    }

    if (fieldValue.value !== undefined) {
      currentValue.value = fieldValue.value
    }
  }

  /**
   * 根据 alias 更新字段表单值。
   */
  const setFieldFormValueByAlias = (alias: string, fieldValue: Partial<DynamicFormFieldValue>) => {
    const field = findFieldByAlias(alias)

    if (!field) {
      return
    }

    setFieldFormValue(field, fieldValue)
  }

  /**
   * 清空字段值。
   */
  const clearFieldValue = (field: TaskFieldConfigViewItem) => {
    const currentValue = getFieldFormValue(field)

    if (!currentValue) {
      return
    }

    currentValue.label = ''
    currentValue.value = ''
  }

  /**
   * 根据 alias 清空字段值。
   */
  const clearFieldValueByAlias = (alias: string) => {
    const field = findFieldByAlias(alias)

    if (!field) {
      return
    }

    clearFieldValue(field)
  }

  /**
   * 更新字段选项。
   *
   * 没有选项时统一设置为 null。
   */
  const setFieldOptions = (field: TaskFieldConfigViewItem, options: TaskFieldOption[]) => {
    field.options = options.length ? options : null
  }

  /**
   * 根据 alias 更新字段选项。
   */
  const setFieldOptionsByAlias = (alias: string, options: TaskFieldOption[]) => {
    const field = findFieldByAlias(alias)

    if (!field) {
      return
    }

    setFieldOptions(field, options)
  }

  /**
   * 单选打开前处理。
   *
   * 特殊接口请求和业务校验写在这里。
   */
  const handleSingleSelectBeforeOpen = async (field: TaskFieldConfigViewItem): Promise<boolean> => {
    console.log('field', field)

    if (field.taskTypeId === '18' && field.alias === 'pharmacyName') {
      uni.navigateTo({
        url: `/pages-common/entity-selector/index?alias=pharmacyName`,
        events: {
          pharmacyNameSelect: (selectedPharmacyItem: PharmacyItem | string) => {
            setPharmacyNameSelectEvent(selectedPharmacyItem)
          },
        },
      })
      return false
    }
    if (taskTypeId.value === '47') {
      /**
       * OTC 推广任务示例。
       */
      const scorePackageValue = getFieldFormValueByAlias('scorePackage')
      console.log('scorePackageValue', scorePackageValue)
      if (field.taskFiledValue === '产品') {
        if (!scorePackageValue?.value) {
          uni.showToast({
            title: '请先选择积分包',
            icon: 'none',
          })
          return false
        } else {
          const arr = await getListDrugTable(String(scorePackageValue.value))
          field.options = arr
          return true
        }
      }

      if (field.alias === 'realTaskTypeId') {
        return true
      }
    }

    return true
  }

  const getListDrugTable = async (packageId: string) => {
    try {
      const res = await getListDrugTableApi(packageId)
      const arr = res.data.map((item: string) => {
        return {
          label: item,
          value: item,
        }
      })
      return arr
    } catch (error) {
      console.error('获取药品列表失败：', error)
      return []
    }
  }

  /**
   * 单选值发生变化。
   *
   * SingleSelect 内部已经保证新值与原值不同时
   * 才会触发此方法。
   */
  const handleSingleSelectChange = (
    field: TaskFieldConfigViewItem,
    event: SingleSelectChangeEvent
  ) => {
    console.log('单选字段：', field)
    console.log('单选变化：', event)

    /**
     * OTC 推广任务的字段联动示例。
     */
    if (taskTypeId.value === '47') {
      if (field.alias === 'scorePackage') {
        clearFieldValueByAlias('realTaskTypeId')
      }
    }
  }

  /**
   * 多选打开前处理。
   */
  const handleMultipleSelectBeforeOpen = async (
    field: TaskFieldConfigViewItem
  ): Promise<boolean> => {
    const currentFormValue = getFieldFormValue(field)

    if (!currentFormValue) {
      console.warn(`未找到字段对应的表单值：${field.id}`)

      return false
    }

    /**
     * 特殊多选接口请求写在这里。
     *
     * 示例：
     *
     * if (
     *   taskTypeId.value === '47' &&
     *   field.alias === 'targetUsers'
     * ) {
     *   const packageValue =
     *     getFieldValueByAlias('scorePackage')
     *
     *   if (!packageValue) {
     *     uni.showToast({
     *       title: '请先选择分数包',
     *       icon: 'none',
     *     })
     *
     *     return false
     *   }
     *
     *   const res = await getTargetUserListApi({
     *     packageId: String(packageValue),
     *   })
     *
     *   setFieldOptions(
     *     field,
     *     res.data.map((item) => ({
     *       label: String(item.name),
     *       value: String(item.id),
     *     }))
     *   )
     * }
     */

    return true
  }

  const setPharmacyNameSelectEvent = (selectedPharmacyItem: PharmacyItem | string) => {
    if (typeof selectedPharmacyItem === 'string') {
      setFieldFormValueByAlias('pharmacyName', {
        label: selectedPharmacyItem,
        value: selectedPharmacyItem,
      })
      return
    }
    setFieldFormValueByAlias('pharmacyName', {
      label: selectedPharmacyItem.pharmacyName,
      value: selectedPharmacyItem.pharmacyName,
    })
    setFieldFormValueByAlias('pharmacyType', {
      label: undefined,
      value: selectedPharmacyItem.pharmacyType,
    })
    setFieldFormValueByAlias('address', {
      label: selectedPharmacyItem.address,
      value: selectedPharmacyItem.address,
    })

    const address = `${selectedPharmacyItem.province}-${selectedPharmacyItem.city}-${selectedPharmacyItem.area}`
    setFieldFormValueByAlias('shengshiqu', {
      label: address,

      value: address,
    })
  }

  return {
    handleSingleSelectBeforeOpen,
    handleSingleSelectChange,
    handleMultipleSelectBeforeOpen,

    /**
     * 以下方法可按需在页面或其他业务逻辑中使用。
     */
    findFieldByAlias,
    getFieldFormValue,
    getFieldFormValueByAlias,
    getFieldValueByAlias,
    setFieldFormValue,
    setFieldFormValueByAlias,
    clearFieldValue,
    clearFieldValueByAlias,
    setFieldOptions,
    setFieldOptionsByAlias,
  }
}