import { type Ref, ref } from 'vue'

import { draftTaskContentApi, saveTaskContentApi } from '@/services/modules/task/taskFrom'
import type {
  SaveTaskContentBody,
  SaveTaskContentQuery,
  SaveTaskContentSuccessData,
} from '@/services/modules/task/taskFrom/type'

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

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

type FormAction = 'save' | 'submit'

const PACKAGE_FIELD_ALIASES = new Set(['approvalResult', 'scorePackage'])
const IMAGE_FIELD_TYPE = 'img'
const SUCCESS_TOAST_DURATION = 3000

const ACTION_API_MAP = {
  save: draftTaskContentApi,
  submit: saveTaskContentApi,
} satisfies Record<FormAction, typeof saveTaskContentApi>

const ACTION_FAILURE_TEXT = {
  save: '保存失败',
  submit: '提交失败',
} satisfies Record<FormAction, string>

const isEmptyValue = (value: unknown): boolean => {
  return value === undefined || value === null || String(value).trim() === ''
}

const normalizeSizeLimit = (value: unknown): number | null => {
  if (value === undefined || value === null || value === '') {
    return null
  }

  const size = Number(value)

  if (!Number.isFinite(size) || size <= 0) {
    return null
  }

  return Math.floor(size)
}

const getContentLength = (value: unknown): number => {
  if (value === undefined || value === null) {
    return 0
  }

  return Array.from(String(value).trim()).length
}

const getImageCount = (value: unknown): number => {
  if (typeof value !== 'string') {
    return 0
  }

  return value
    .split(',')
    .map((item) => item.trim())
    .filter(Boolean).length
}

const showMessage = (title: string, duration?: number): void => {
  uni.showToast({
    title,
    icon: 'none',
    ...(duration === undefined ? {} : { duration }),
  })
}

/**
 * 从接口 data 中提取有效图片地址。
 */
const extractImageUrls = (data: unknown): string[] => {
  if (!Array.isArray(data)) {
    return []
  }

  const imageUrls = data
    .filter((item): item is string => typeof item === 'string' && item.trim().length > 0)
    .map((item) => item.trim())

  return [...new Set(imageUrls)]
}

/**
 * 判断是否为提交成功数据。
 */
const isSaveTaskContentSuccessData = (data: unknown): data is SaveTaskContentSuccessData => {
  if (!data || typeof data !== 'object' || Array.isArray(data)) {
    return false
  }

  const record = data as Record<string, unknown>

  return typeof record.score === 'string' && typeof record.type === 'string'
}

export const useTaskFormAction = ({
  taskTypeId,
  form,
  taskFieldConfigList,
}: UseTaskFormActionOptions) => {
  let actionLocked = false

  const duplicateImageVisible = ref(false)
  const duplicateImageList = ref<string[]>([])

  const findPackageField = (): TaskFieldConfigViewItem | undefined => {
    return taskFieldConfigList.value.find((field) => PACKAGE_FIELD_ALIASES.has(field.alias ?? ''))
  }

  const getPackageId = (): string => {
    const packageField = findPackageField()

    if (!packageField) {
      return ''
    }

    return String(form.value.value[packageField.id]?.value ?? '').trim()
  }

  const validateImageField = (field: TaskFieldConfigViewItem, value: unknown): boolean => {
    const imageCount = getImageCount(value)

    const configuredMinSize = normalizeSizeLimit(field.taskFiledMinsize)

    const maxSize = normalizeSizeLimit(field.taskFiledMaxsize)

    const minSize = field.isMustfill === '1' ? (configuredMinSize ?? 1) : configuredMinSize

    if (imageCount === 0 && field.isMustfill !== '1') {
      return true
    }

    if (minSize !== null && imageCount < minSize) {
      showMessage(`${field.taskFiledValue}最少需要${minSize}张`)

      return false
    }

    if (maxSize !== null && imageCount > maxSize) {
      showMessage(`${field.taskFiledValue}最多上传${maxSize}张`)

      return false
    }

    return true
  }

  const validateContentField = (field: TaskFieldConfigViewItem, value: unknown): boolean => {
    if (isEmptyValue(value)) {
      if (field.isMustfill === '1') {
        showMessage(`请完善${field.taskFiledValue}`)
        return false
      }

      return true
    }

    const contentLength = getContentLength(value)

    const minSize = normalizeSizeLimit(field.taskFiledMinsize)

    const maxSize = normalizeSizeLimit(field.taskFiledMaxsize)

    if (minSize !== null && contentLength < minSize) {
      showMessage(`${field.taskFiledValue}最少输入${minSize}个字符`)

      return false
    }

    if (maxSize !== null && contentLength > maxSize) {
      showMessage(`${field.taskFiledValue}最多输入${maxSize}个字符`)

      return false
    }

    return true
  }

  const validateField = (field: TaskFieldConfigViewItem): boolean => {
    const value = form.value.value[field.id]?.value

    if (field.taskFiledType === IMAGE_FIELD_TYPE) {
      return validateImageField(field, value)
    }

    return validateContentField(field, value)
  }

  const validateSubmitForm = (): boolean => {
    for (const field of taskFieldConfigList.value) {
      if (!validateField(field)) {
        return false
      }
    }

    return true
  }

  const buildActionQuery = (action: FormAction): SaveTaskContentQuery | null => {
    const normalizedTaskTypeId = taskTypeId.value.trim()

    if (!normalizedTaskTypeId) {
      showMessage('缺少 taskTypeId')
      return null
    }

    const packageId = getPackageId()

    if (action === 'submit' && !packageId) {
      const packageField = findPackageField()

      showMessage(
        packageField ? `请完善${packageField.taskFiledValue}` : '表单配置中未找到关联积分包字段'
      )

      return null
    }

    return {
      taskTypeId: normalizedTaskTypeId,
      packageId,
    }
  }

  const buildSubmitPayload = (): SaveTaskContentBody => {
    const payload: SaveTaskContentBody = {}

    for (const field of taskFieldConfigList.value) {
      const fieldValue = form.value.value[field.id]

      payload[field.taskFiledValue] = {
        seq: field.seq ?? 0,

        ...(field.isMustfill === '1'
          ? {
              required: true,
            }
          : {}),

        items: [
          {
            label: String(fieldValue?.label ?? ''),
            type: field.taskFiledType,
            value: String(fieldValue?.value ?? ''),
          },
        ],
      }
    }

    return payload
  }

  const clearDuplicateImages = (): void => {
    duplicateImageList.value = []
  }

  const showDuplicateImages = (images: string[]): void => {
    duplicateImageList.value = images
    duplicateImageVisible.value = true
  }

  const handleActionSuccess = (action: FormAction, data: unknown): void => {
    if (action === 'save') {
      showMessage('保存成功', SUCCESS_TOAST_DURATION)
    } else {
      if (!isSaveTaskContentSuccessData(data)) {
        showMessage('提交结果数据异常')
        return
      }

      showMessage(`提交成功,若审核通过可获得${data.score}积分`, SUCCESS_TOAST_DURATION)
    }

    setTimeout(() => {
      uni.navigateBack()
    }, SUCCESS_TOAST_DURATION)
  }

  const executeAction = async (action: FormAction): Promise<void> => {
    if (actionLocked) {
      return
    }

    actionLocked = true

    try {
      if (action === 'submit' && !validateSubmitForm()) {
        return
      }

      const query = buildActionQuery(action)

      if (!query) {
        return
      }

      const payload = buildSubmitPayload()
      const requestApi = ACTION_API_MAP[action]

      const response = await requestApi(query, payload)

      /**
       * 提交时：
       * code === 1 且 data 为非空图片数组，
       * 视为图片重复，不能进入成功逻辑。
       */
      if (action === 'submit' && response.code === 1) {
        const duplicateImages = extractImageUrls(response.data)

        if (duplicateImages.length > 0) {
          showDuplicateImages(duplicateImages)
          return
        }
      }

      /**
       * 所有非 0 状态码均不能视为成功。
       */
      if (response.code !== 0) {
        showMessage(response.msg || ACTION_FAILURE_TEXT[action])

        return
      }

      handleActionSuccess(action, response.data)
    } catch (error: unknown) {
      console.error(`[useTaskFormAction] ${action} 失败`, error)

      showMessage(ACTION_FAILURE_TEXT[action])
    } finally {
      actionLocked = false
    }
  }

  const handleSave = (): Promise<void> => {
    return executeAction('save')
  }

  const handleSubmit = (): Promise<void> => {
    return executeAction('submit')
  }

  return {
    duplicateImageVisible,
    duplicateImageList,
    clearDuplicateImages,
    handleSave,
    handleSubmit,
  }
}