import test from 'node:test'
import assert from 'node:assert/strict'
import { readSource } from './helpers.ts'
import {
  countryDistribution,
  duplicateSiteDistribution,
  topShopsByAsin,
} from '../src/pages/tasks/duplicate-distribution.ts'
import type { DuplicateShop } from '../src/pages/tasks/duplicate-model.ts'

function shop(shopName: string, countryCodes: string[], asinCount: number): DuplicateShop {
  return { shopName, groupName: '', countryCodes, asinCount, recordCount: 0 }
}

test('test_task_116_duplicate_distribution_normal_primary_path', () => {
  // 正常主路径：按国家/站点聚合撞款分布(合计 asin 与店铺数)。
  const shops = [shop('A', ['DE', 'UK'], 10), shop('B', ['DE'], 5), shop('C', ['FR'], 3)]
  const dist = countryDistribution(shops)
  const de = dist.find((d) => d.country === 'DE')
  assert.equal(de!.asinCount, 15)
  assert.equal(de!.shopCount, 2)
  assert.equal(dist.length, 3)
})

test('test_task_116_duplicate_distribution_normal_variant_input', () => {
  // 正常变体：site 取单国家码首字段。
  const dist = duplicateSiteDistribution([shop('A', ['DE'], 4)])
  assert.equal(dist.length, 1)
  assert.equal(dist[0].site, 'DE')
  assert.equal(dist[0].asinCount, 4)
})

test('test_task_116_duplicate_distribution_repeated_is_idempotent', () => {
  // 正常重复：聚合稳定、不改输入。
  const shops = [shop('A', ['DE'], 3)]
  assert.deepEqual(countryDistribution(shops), countryDistribution(shops))
  assert.equal(shops[0].asinCount, 3)
})

test('test_task_116_duplicate_distribution_boundary_empty_input', () => {
  // 边界空值：空店铺列表无分布。
  assert.deepEqual(countryDistribution([]), [])
  assert.deepEqual(topShopsByAsin([], 5), [])
})

test('test_task_116_duplicate_distribution_boundary_single_item', () => {
  // 边界单元素：单店单国家。
  const dist = countryDistribution([shop('A', ['UK'], 2)])
  assert.equal(dist.length, 1)
  assert.equal(dist[0].shopCount, 1)
})

test('test_task_116_duplicate_distribution_boundary_limit_or_missing_field', () => {
  // 边界上限/缺字段：无国家的店铺不计入国家分布。
  const dist = countryDistribution([shop('A', [], 7)])
  assert.deepEqual(dist, [])
})

test('test_task_116_duplicate_distribution_invalid_input_rejected', () => {
  // 异常输入：top 负数回空或 0 条。
  assert.deepEqual(topShopsByAsin([shop('A', ['DE'], 9)], 0), [])
})

test('test_task_116_duplicate_distribution_dependency_failure_returns_actionable_message', () => {
  // 依赖失败/可操作：分布计算纯逻辑、无框架/http。
  const mod = readSource('src/pages/tasks/duplicate-distribution.ts')
  assert.equal(/axios|http\.|vue/.test(mod), false, '分布计算保持纯逻辑')
  assert.match(mod, /topShopsByAsin/)
})