/** 去重汇总导出等待模型（任务 64）：导出 URL 构建 + 运行等待态提示，纯逻辑。 */
import { validIsoDateOrUndefined } from './asin-filter.ts'
import type { DedupeTotalFilterState } from './dedupe-total-filter.ts'

export const DEDUPE_TOTAL_EXPORT_ENDPOINT = '/api/admin/dedupe-total-data/export'

export type DedupeExportStage = 'idle' | 'running' | 'done' | 'error'

/** 运行中/完成等待提示；idle 无提示。 */
export function exportStageHint(stage: DedupeExportStage): string | undefined {
  switch (stage) {
    case 'running':
      return '正在生成并下载导出文件，请稍候…'
    case 'done':
      return '导出完成'
    case 'error':
      return '导出失败，请重试'
    default:
      return undefined
  }
}

/** 按导出可用筛选(用户名/日期区间/分组/国家)构建查询串；空白/非法条件不下发。 */
export function buildDedupeExportQuery(state: DedupeTotalFilterState): string {
  const params = new URLSearchParams()
  const username = (state.username || '').trim()
  const country = (state.country || '').trim()
  if (username) params.set('username', username)
  if (country) params.set('country', country)
  const startDate = validIsoDateOrUndefined(state.startDate)
  const endDate = validIsoDateOrUndefined(state.endDate)
  if (startDate) params.set('start_date', startDate)
  if (endDate) params.set('end_date', endDate)
  if (typeof state.groupId === 'number' && state.groupId >= 1) params.set('group_id', String(state.groupId))
  return params.toString()
}

/** 导出下载地址：浏览器直接访问该 URL 触发流式下载。 */
export function toExportUrl(state: DedupeTotalFilterState): string {
  const query = buildDedupeExportQuery(state)
  return query ? `${DEDUPE_TOTAL_EXPORT_ENDPOINT}?${query}` : DEDUPE_TOTAL_EXPORT_ENDPOINT
}