function count(value) {
  const number = Number(value)
  return Number.isFinite(number) ? number : NaN
}

function currentMonth() {
  return new Intl.DateTimeFormat('en-CA', {
    timeZone: 'Asia/Shanghai', year: 'numeric', month: '2-digit',
  }).format(new Date()).slice(0, 7)
}

function id(value) { return value == null ? '' : String(value) }

function listOf(value) {
  if (Array.isArray(value)) return value
  if (Array.isArray(value?.records)) return value.records
  return null
}

export async function run(context) {
  const module = 'sailing-calendar'
  const base = '/api/platform/v1/sailings'
  const month = currentMonth()

  const calendarResponse = await context.request('GET', `${base}/calendar?month=${month}`)
  const calendar = context.apiSuccess(module, '查询船期月历', calendarResponse)
  const records = Array.isArray(calendar?.records) ? calendar.records : []
  const summary = calendar?.summary
  const filterOptions = calendar?.filterOptions
  context.assert(module, '月历记录、汇总与筛选选项结构完整', calendarResponse,
    records.every((row) => id(row.id) && id(row.sailingNo)
      && (row.etaAt == null || Number.isFinite(Date.parse(row.etaAt))))
      && summary && Number.isFinite(count(summary.sailingCount))
      && filterOptions && Array.isArray(filterOptions.warehouses) && Array.isArray(filterOptions.channels),
    `month=${month},records=${records.length},sailingCount=${summary?.sailingCount ?? 'missing'}`)
  context.assert(module, '月历容量汇总均为非负有限数', calendarResponse,
    ['actualReceivedCbm', 'catchableForecastCbm', 'riskUnmatchedCbm'].every((field) =>
      Number.isFinite(count(summary?.[field])) && count(summary?.[field]) >= 0),
    JSON.stringify(summary || {}).slice(0, 200))

  const channelsResponse = await context.request('GET', '/api/platform/v1/sailing-channels')
  const channels = context.apiSuccess(module, '查询船期渠道资源', channelsResponse)
  const channelRows = listOf(channels) ?? []
  context.assert(module, '渠道列表字段完整', channelsResponse,
    channelRows.every((row) => id(row.id) && id(row.channelCode) && Number.isFinite(count(row.defaultCutoffDays))),
    `count=${channelRows.length}`)

  const templatesResponse = await context.request('GET', '/api/platform/v1/sailing-templates?page=1&size=200')
  const templates = context.apiSuccess(module, '查询船期模板', templatesResponse)
  const templateRows = listOf(templates) ?? []
  context.assert(module, '模板列表字段完整', templatesResponse,
    templateRows.every((row) => id(row.id) && id(row.channelId) && id(row.warehouseId) && Array.isArray(row.weekdays)),
    `count=${templateRows.length}`)

  const exceptionsResponse = await context.request('GET', '/api/platform/v1/sailing-assignments/exceptions?page=1&size=20')
  const exceptions = context.apiSuccess(module, '查询船期异常分配', exceptionsResponse)
  const exceptionRows = listOf(exceptions) ?? []
  context.assert(module, '异常分配列表字段完整', exceptionsResponse,
    exceptionRows.every((row) => id(row.assignmentId) && Number.isFinite(count(row.volumeCbm))),
    `count=${exceptionRows.length},total=${exceptions?.total ?? 'array'}`)

  if (records[0]) {
    const detailResponse = await context.request('GET', `${base}/${encodeURIComponent(records[0].id)}`)
    const detail = context.apiSuccess(module, '查询当前船期详情', detailResponse)
    context.assert(module, '船期详情包含版本与货量摘要', detailResponse,
      id(detail?.sailing?.id) === id(records[0].id)
        && Number.isFinite(count(detail?.sailing?.version))
        && detail?.sailing?.volumeSummary != null
        && Array.isArray(detail?.histories),
      `id=${detail?.sailing?.id},version=${detail?.sailing?.version}`)
  } else {
    context.addCoverageGap(module, 'sailing-calendar', '船期详情与变更历史',
      '当前月份没有船期记录；需先由订舱/模板生成本轮船期后重跑', 'not-implemented', { blocking: false })
  }

  const missingResponse = await context.request('GET', `${base}/999999999999999`)
  context.assert(module, '不存在的船期详情被拒绝', missingResponse,
    (missingResponse.http === 200 && ['A0403', 'A0404'].includes(String(missingResponse.body?.code)))
      || missingResponse.http === 404,
    `HTTP=${missingResponse.http},code=${missingResponse.body?.code ?? 'missing'}`)
}