/**
 * 表头批量/筛选护栏 + 订单列表默认时间窗（前后端应对齐）
 */
import dayjs, { type Dayjs } from 'dayjs'

/** 批量单号 / IN 值上限 */
export const MAX_HEADER_BATCH_VALUES = 500

/** 单个筛选值最大字符数 */
export const MAX_HEADER_FILTER_VALUE_LEN = 128

/** filters[] 最大条数（前端组装时裁剪） */
export const MAX_HEADER_FILTERS = 20

/** 订单列表默认仅查近 N 天（无精确单号时） */
export const ORDER_LIST_DEFAULT_DAYS = 90

/** 导出最大行数（与后端一致） */
export const ORDER_EXPORT_MAX_ROWS = 10000

export function clampBatchValues(values: string[], max = MAX_HEADER_BATCH_VALUES): {
  values: string[]
  truncated: boolean
  originalCount: number
} {
  const unique = Array.from(
    new Set(
      values
        .map((v) => String(v || '').trim().slice(0, MAX_HEADER_FILTER_VALUE_LEN))
        .filter(Boolean),
    ),
  )
  if (unique.length <= max) {
    return { values: unique, truncated: false, originalCount: unique.length }
  }
  return {
    values: unique.slice(0, max),
    truncated: true,
    originalCount: unique.length,
  }
}

export function normalizeBatchInputText(text: string, max = MAX_HEADER_BATCH_VALUES): {
  value: string
  truncated: boolean
  originalCount: number
  keptCount: number
} {
  const lines = String(text || '')
    .split(/[\n\r]+/)
    .flatMap((line) => line.split(/[,，\t;；]/))
    .map((v) => v.trim())
    .filter(Boolean)
  const { values, truncated, originalCount } = clampBatchValues(lines, max)
  return {
    value: values.join(','),
    truncated,
    originalCount,
    keptCount: values.length,
  }
}

export function buildDefaultCreateTimeRange(
  days = ORDER_LIST_DEFAULT_DAYS,
): [Dayjs, Dayjs] {
  const end = dayjs().endOf('day')
  const start = dayjs()
    .subtract(Math.max(days, 1) - 1, 'day')
    .startOf('day')
  return [start, end]
}

export function formatCreateTimeRangeParam(
  range: (Date | string | Dayjs)[] | undefined | null,
): { createTimeStart: string; createTimeEnd: string } | null {
  if (!range || range.length < 2 || !range[0] || !range[1]) return null
  return {
    createTimeStart: dayjs(range[0]).startOf('day').format('YYYY-MM-DD HH:mm:ss'),
    createTimeEnd: dayjs(range[1]).endOf('day').format('YYYY-MM-DD HH:mm:ss'),
  }
}

/** 是否与「默认近 N 天」窗口一致（允许差 1 分钟内） */
export function isDefaultCreateTimeRange(
  range: (Date | string | Dayjs)[] | undefined | null,
  days = ORDER_LIST_DEFAULT_DAYS,
): boolean {
  if (!range || range.length < 2 || !range[0] || !range[1]) return false
  const [defStart, defEnd] = buildDefaultCreateTimeRange(days)
  const start = dayjs(range[0])
  const end = dayjs(range[1])
  return (
    Math.abs(start.startOf('day').diff(defStart, 'minute')) < 2 &&
    Math.abs(end.endOf('day').diff(defEnd, 'minute')) < 2
  )
}