import { test } from 'node:test'
import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import { createRequire } from 'node:module'
import { transform } from 'esbuild'

const require = createRequire(import.meta.url)
const source = await readFile(new URL('../src/utils/teaching-schedule.ts', import.meta.url), 'utf8')
const { code } = await transform(source, { loader: 'ts', format: 'cjs' })
const module = { exports: {} }
new Function('require', 'module', 'exports', code)(require, module, module.exports)
const { getTeachingScheduleLessons } = module.exports

function slot(id, statuses) {
  return {
    slotId: id, date: '2026-10-29', startTime: '18:00', endTime: '19:00', bookedCount: statuses.length, capacity: 5,
    students: statuses.map((status, index) => ({ bookingId: `${id}-${index}`, userId: `u-${index}`, nickname: '测试', phone: null, status })),
  }
}

test('只计待确认、已确认、已完成；取消和未出席的独立时段不计课', () => {
  const result = getTeachingScheduleLessons([
    slot('pending', ['PENDING_CONFIRMATION']), slot('confirmed', ['CONFIRMED']), slot('completed', ['COMPLETED']),
    slot('cancelled', ['CANCELLED']), slot('no-show', ['NO_SHOW']), slot('empty', []),
  ])
  assert.deepEqual(result.map(item => item.slotId), ['pending', 'confirmed', 'completed'])
  assert.equal(result.reduce((sum, item) => sum + item.students.length, 0), 3)
})

test('混合状态团课仍计一节课，人数只计有效预约，且保留完成状态', () => {
  const source = [slot('group', ['CANCELLED', 'CONFIRMED', 'COMPLETED', 'NO_SHOW'])]
  const snapshot = structuredClone(source)
  const result = getTeachingScheduleLessons(source)
  assert.equal(result.length, 1)
  assert.equal(result[0].students.length, 2)
  assert.deepEqual(result[0].students.map(student => student.status), ['CONFIRMED', 'COMPLETED'])
  assert.deepEqual(source, snapshot)
})

test('全部取消或无预约时，课程数和人数均为零', () => {
  assert.deepEqual(getTeachingScheduleLessons([slot('cancelled', ['CANCELLED', 'CANCELLED'])]), [])
  assert.deepEqual(getTeachingScheduleLessons([]), [])
})