import { test } from 'node:test'
import assert from 'node:assert/strict'
import { createTaskPollingBaseline } from '../src/shared/task-polling-baseline.ts'

interface FakeDetail {
  id: number
  name: string
  status: string
}

function detail(id: number): FakeDetail {
  return { id, name: `task-${id}`, status: id % 2 === 0 ? 'SUCCESS' : 'RUNNING' }
}

const byId = (d: FakeDetail) => d.id
const enc = (v: unknown) => new TextEncoder().encode(JSON.stringify(v)).byteLength

test('test_task_081_polling_frontend_normal_default_path', () => {
  const baseline = createTaskPollingBaseline()
  baseline.recordRequest()
  baseline.recordRequest()
  baseline.recordRequest()
  const inserted = baseline.recordResponseItems([detail(1), detail(2)], byId)
  assert.equal(inserted, 2)
  const stats = baseline.stats()
  assert.equal(stats.requestCount, 3)
  assert.equal(stats.entryCount, 2)
  assert.equal(stats.droppedCount, 0)
  assert.ok(stats.cachedBytes > 0)
  assert.ok(stats.cachedBytes <= 1024 * 1024)
  assert.equal(stats.totalResponseBytes, enc([detail(1), detail(2)]))
  assert.equal(stats.largestResponseBytes, stats.totalResponseBytes)
  assert.deepEqual(stats.entryKeys, [1, 2])
})

test('test_task_081_polling_frontend_normal_multiple_items', () => {
  const baseline = createTaskPollingBaseline()
  const items = Array.from({ length: 10 }, (_, i) => detail(i + 1))
  const inserted = baseline.recordResponseItems(items, byId)
  assert.equal(inserted, 10)
  const stats = baseline.stats()
  assert.equal(stats.entryCount, 10)
  assert.deepEqual(stats.entryKeys, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
  // 覆盖更新不改变首次到达顺序
  baseline.recordResponseItems([detail(5)], byId)
  const after = baseline.stats()
  assert.equal(after.entryCount, 10)
  assert.deepEqual(after.entryKeys, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
  assert.equal(after.totalResponseBytes, enc(items) + enc([detail(5)]))
  assert.equal(after.largestResponseBytes, enc(items))
})

test('test_task_081_polling_frontend_normal_repeated_operation_is_idempotent', () => {
  const baseline = createTaskPollingBaseline()
  const items = [detail(1), detail(2), detail(3)]
  baseline.recordResponseItems(items, byId)
  baseline.recordResponseItems(items, byId)
  const stats = baseline.stats()
  assert.equal(stats.entryCount, 3)
  assert.equal(stats.droppedCount, 0)
  const single = createTaskPollingBaseline()
  single.recordResponseItems(items, byId)
  assert.equal(stats.cachedBytes, single.stats().cachedBytes)
  assert.equal(stats.totalResponseBytes, single.stats().totalResponseBytes * 2)
})

test('test_task_081_polling_frontend_boundary_empty_input', () => {
  const baseline = createTaskPollingBaseline()
  assert.equal(baseline.recordResponseItems([], byId), 0)
  assert.equal(baseline.recordResponseItems([], byId), 0)
  const stats = baseline.stats()
  assert.equal(stats.requestCount, 0)
  assert.equal(stats.totalResponseBytes, 0)
  assert.equal(stats.largestResponseBytes, 0)
  assert.equal(stats.entryCount, 0)
  assert.equal(stats.cachedBytes, 0)
  assert.equal(stats.droppedCount, 0)
  assert.deepEqual(stats.entryKeys, [])
})

test('test_task_081_polling_frontend_boundary_single_item', () => {
  const baseline = createTaskPollingBaseline()
  const inserted = baseline.recordResponseItems([detail(7)], byId)
  assert.equal(inserted, 1)
  const stats = baseline.stats()
  assert.equal(stats.entryCount, 1)
  assert.deepEqual(stats.entryKeys, [7])
  assert.equal(stats.cachedBytes, enc(detail(7)) + 64)
  assert.equal(stats.totalResponseBytes, enc([detail(7)]))
})

test('test_task_081_polling_frontend_boundary_limit_and_overflow', () => {
  // 条目数超限：驱逐最旧，缓存有界
  const byEntries = createTaskPollingBaseline({ maxEntries: 3, maxCacheBytes: 1_000_000 })
  byEntries.recordResponseItems([detail(1), detail(2), detail(3), detail(4), detail(5)], byId)
  const s1 = byEntries.stats()
  assert.equal(s1.entryCount, 3)
  assert.deepEqual(s1.entryKeys, [3, 4, 5])
  assert.equal(s1.droppedCount, 2)
  // 单条超过字节上限：直接拒绝
  const small = createTaskPollingBaseline({ maxCacheBytes: 200 })
  const big = { id: 9, name: 'x'.repeat(1000), status: 'RUNNING' }
  const inserted = small.recordResponseItems([big], byId)
  assert.equal(inserted, 0)
  const s2 = small.stats()
  assert.equal(s2.entryCount, 0)
  assert.equal(s2.droppedCount, 1)
  assert.ok(s2.cachedBytes <= 200)
  // 批量累积超限：逐条驱逐最旧直到有界
  const tiny = createTaskPollingBaseline({ maxCacheBytes: 300 })
  tiny.recordResponseItems([detail(1), detail(2), detail(3)], byId)
  const s3 = tiny.stats()
  assert.equal(s3.entryCount, 2)
  assert.deepEqual(s3.entryKeys, [2, 3])
  assert.equal(s3.droppedCount, 1)
  assert.ok(s3.cachedBytes <= 300)
})

test('test_task_081_polling_frontend_invalid_input_rejected', () => {
  const baseline = createTaskPollingBaseline()
  assert.throws(() => baseline.recordResponseItems(null as never, byId), /items 必须是数组/)
  assert.throws(() => baseline.recordResponseItems([detail(1)], null as never), /extractKey 必须是函数/)
  assert.throws(() => createTaskPollingBaseline({ maxEntries: 0 }), /上限配置必须为正数/)
  assert.throws(() => createTaskPollingBaseline({ maxCacheBytes: -1 }), /上限配置必须为正数/)
  // 非法 key 跳过而不是抛错（与轮询层行为一致）
  const inserted = baseline.recordResponseItems(
    [{ id: 0, name: 'x', status: 'y' }, detail(2)],
    byId,
  )
  assert.equal(inserted, 1)
})

test('test_task_081_polling_frontend_dependency_failure_releases_resources', () => {
  const baseline = createTaskPollingBaseline()
  baseline.recordRequest()
  assert.throws(
    () =>
      baseline.recordResponseItems([detail(1)], () => {
        throw new Error('boom')
      }),
    /boom/,
  )
  const after = baseline.stats()
  assert.equal(after.entryCount, 0)
  assert.equal(after.totalResponseBytes, 0)
  assert.equal(after.requestCount, 1)
  assert.equal(after.droppedCount, 0)
  baseline.reset()
  assert.deepEqual(baseline.stats(), {
    requestCount: 0,
    totalResponseBytes: 0,
    largestResponseBytes: 0,
    entryCount: 0,
    cachedBytes: 0,
    droppedCount: 0,
    entryKeys: [],
  })
  // 错误可恢复：修复后同一实例继续工作
  baseline.recordResponseItems([detail(1)], byId)
  assert.equal(baseline.stats().entryCount, 1)
})