import type { Request, Response } from 'express'
import { errorResponse, successResponse } from '../utils/response'
import {
  assignUnassignedTaskItem,
  closeInventoryTask,
  createInventoryTask,
  deleteInventoryTask,
  getInventoryTaskDetail,
  getTaskUnassignedItems,
  listInventoryTasks,
  previewInventoryTask,
  submitAdminInventoryScan
} from '../services/inventoryService'
import { normalizeInventoryScopeInput } from '../utils/inventoryScope'

const toOptionalNumber = (value: unknown) => {
  if (value === undefined || value === null || value === '') return null
  const numericValue = Number(value)
  return Number.isNaN(numericValue) ? null : numericValue
}

export const previewInventoryTaskController = async (req: Request, res: Response) => {
  try {
    const normalizedScope = normalizeInventoryScopeInput({
      department_id: toOptionalNumber(req.body?.department_id),
      department_ids: req.body?.department_ids,
      asset_type_id: toOptionalNumber(req.body?.asset_type_id),
      asset_type_ids: req.body?.asset_type_ids,
      storage_location_id: toOptionalNumber(req.body?.storage_location_id),
      storage_location_ids: req.body?.storage_location_ids,
      person_id: toOptionalNumber(req.body?.person_id),
      person_ids: req.body?.person_ids
    })
    const result = await previewInventoryTask(normalizedScope)
    successResponse(res, result, '预览成功')
  } catch (error: any) {
    errorResponse(res, error.message || '预览盘点任务失败', 422)
  }
}

export const createInventoryTaskController = async (req: Request, res: Response) => {
  try {
    const currentUserId = Number(res.locals.user?.id)
    if (!Number.isInteger(currentUserId) || currentUserId <= 0) {
      return errorResponse(res, '未获取到当前登录用户', 401)
    }

    const normalizedScope = normalizeInventoryScopeInput({
      department_id: toOptionalNumber(req.body?.department_id),
      department_ids: req.body?.department_ids,
      asset_type_id: toOptionalNumber(req.body?.asset_type_id),
      asset_type_ids: req.body?.asset_type_ids,
      storage_location_id: toOptionalNumber(req.body?.storage_location_id),
      storage_location_ids: req.body?.storage_location_ids,
      person_id: toOptionalNumber(req.body?.person_id),
      person_ids: req.body?.person_ids
    })

    const result = await createInventoryTask(
      {
        title: req.body?.title,
        description: req.body?.description,
        deadline_at: req.body?.deadline_at,
        department_ids: normalizedScope.departmentIds,
        asset_type_ids: normalizedScope.assetTypeIds,
        storage_location_ids: normalizedScope.storageLocationIds,
        person_ids: normalizedScope.personIds
      },
      currentUserId
    )

    successResponse(res, result, '创建成功')
  } catch (error: any) {
    errorResponse(res, error.message || '创建盘点任务失败', 422)
  }
}

export const getInventoryTaskListController = async (req: Request, res: Response) => {
  try {
    const page = Math.max(1, Number(req.query.page) || 1)
    const pageSize = Math.min(50, Math.max(1, Number(req.query.pageSize) || 10))
    const result = await listInventoryTasks(page, pageSize)
    successResponse(res, result, '获取成功')
  } catch (error: any) {
    errorResponse(res, error.message || '获取盘点任务列表失败', 500)
  }
}

export const getInventoryTaskDetailController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    if (!Number.isInteger(taskId) || taskId <= 0) {
      return errorResponse(res, '盘点任务不存在', 404)
    }

    const result = await getInventoryTaskDetail(taskId)
    successResponse(res, result, '获取成功')
  } catch (error: any) {
    const message = error.message || '获取盘点任务详情失败'
    errorResponse(res, message, message.includes('不存在') ? 404 : 500)
  }
}

export const closeInventoryTaskController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    const currentUserId = Number(res.locals.user?.id)
    if (!Number.isInteger(taskId) || taskId <= 0) {
      return errorResponse(res, '盘点任务不存在', 404)
    }
    if (!Number.isInteger(currentUserId) || currentUserId <= 0) {
      return errorResponse(res, '未获取到当前登录用户', 401)
    }

    await closeInventoryTask(taskId, currentUserId)
    successResponse(res, null, '任务已关闭')
  } catch (error: any) {
    const message = error.message || '关闭盘点任务失败'
    errorResponse(res, message, message.includes('不存在') ? 404 : 500)
  }
}

export const deleteInventoryTaskController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    if (!Number.isInteger(taskId) || taskId <= 0) {
      return errorResponse(res, '盘点任务不存在', 404)
    }

    await deleteInventoryTask(taskId)
    successResponse(res, null, '任务已删除')
  } catch (error: any) {
    const message = error.message || '删除盘点任务失败'
    if (message.includes('不存在')) {
      return errorResponse(res, message, 404)
    }
    errorResponse(res, message, 422)
  }
}

export const getInventoryTaskUnassignedController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    if (!Number.isInteger(taskId) || taskId <= 0) {
      return errorResponse(res, '盘点任务不存在', 404)
    }

    const list = await getTaskUnassignedItems(taskId)
    successResponse(res, list, '获取成功')
  } catch (error: any) {
    errorResponse(res, error.message || '获取无人归属资产失败', 500)
  }
}

export const assignInventoryTaskUnassignedController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    const itemId = Number(req.params.itemId)
    const personId = Number(req.body?.person_id)

    if (!Number.isInteger(taskId) || taskId <= 0 || !Number.isInteger(itemId) || itemId <= 0) {
      return errorResponse(res, '待处理资产不存在', 404)
    }

    if (!Number.isInteger(personId) || personId <= 0) {
      return errorResponse(res, '目标人员不能为空', 422)
    }

    await assignUnassignedTaskItem(taskId, itemId, personId)
    successResponse(res, null, '分配成功')
  } catch (error: any) {
    const message = error.message || '分配无人归属资产失败'
    errorResponse(res, message, message.includes('不存在') ? 404 : 422)
  }
}

export const submitAdminInventoryScanController = async (req: Request, res: Response) => {
  try {
    const taskId = Number(req.params.id)
    const currentUserId = Number(res.locals.user?.id)
    const equipmentCode = String(req.body?.equipment_code || '').trim()

    if (!Number.isInteger(taskId) || taskId <= 0) {
      return errorResponse(res, '盘点任务不存在', 404)
    }

    if (!Number.isInteger(currentUserId) || currentUserId <= 0) {
      return errorResponse(res, '未获取到当前登录用户', 401)
    }

    if (!equipmentCode) {
      return errorResponse(res, '资产编码不能为空', 422)
    }

    const item = await submitAdminInventoryScan(taskId, equipmentCode, currentUserId)
    successResponse(res, item, '管理人员代扫成功')
  } catch (error: any) {
    const message = error.message || '管理人员扫码盘点失败'
    errorResponse(
      res,
      message,
      message.includes('不存在') ? 404 : message.includes('关闭') ? 403 : 422
    )
  }
}