import { formatSumMoney } from './format'

export interface SummaryColumn {
  property?: string
  type?: string
}

export interface PageSummaryParams {
  columns: SummaryColumn[]
  data: Record<string, unknown>[]
}

export interface BuildPageSummaryOptions {
  /** 放置合计标签的列 prop，默认 applyCode；默认不展示标签文案 */
  labelProp?: string
  /** 自定义标签文案；默认返回空字符串 */
  labelFormatter?: (count: number) => string
  /** 列 prop -> 合计值（已格式化字符串） */
  sumByProp?: Record<string, (data: Record<string, unknown>[]) => string>
}

/** 对数值字段求和并格式化为合计金额 */
export function sumField(
  data: Record<string, unknown>[],
  field: string,
  optional = false
): string {
  const total = data.reduce((sum, row) => {
    const value = row[field]
    if (optional && (value == null || value === '')) return sum
    return sum + Number(value || 0)
  }, 0)
  return formatSumMoney(total)
}

/** 按业务类型（备用金 / 报销单）分列求和，用于合并列表合计行 */
export function sumFieldByBizType(
  data: Record<string, unknown>[],
  field: string,
  bizTypeField = 'bizType'
): string {
  let advanceTotal = 0
  let reimburseTotal = 0
  for (const row of data) {
    const amount = Number(row[field] || 0)
    const bizType = row[bizTypeField]
    if (bizType === '备用金') advanceTotal += amount
    else if (bizType === '报销单') reimburseTotal += amount
  }
  return `备用金总额 ${formatSumMoney(advanceTotal)} / 报销单总额 ${formatSumMoney(reimburseTotal)}`
}

/**
 * 生成 Element Plus 表格合计行方法；按当前可见 columns 动态对齐，兼容列显隐。
 */
export function buildPageSummaryMethod(options: BuildPageSummaryOptions = {}) {
  const {
    labelProp = 'applyCode',
    labelFormatter = () => '',
    sumByProp = {}
  } = options

  return ({ columns, data }: PageSummaryParams) => {
    const label = labelFormatter(data.length)
    return columns.map((col) => {
      const prop = col.property
      if (prop === labelProp) return label
      if (prop && sumByProp[prop]) return sumByProp[prop](data)
      return ''
    })
  }
}