import { test } from 'node:test'
import assert from 'node:assert/strict'
import { useTaskProgressLoop } from '../src/shared/composables/useTaskProgressLoop.ts'

function setupWindow() {
  const storage = new Map<string, string>()
  ;(globalThis as Record<string, unknown>).window = {
    localStorage: {
      getItem: (k: string) => storage.get(k) ?? null,
      setItem: (k: string, v: string) => { storage.set(k, v) },
      removeItem: (k: string) => { storage.delete(k) },
    },
    setTimeout: (fn: () => void, ms: number) => globalThis.setTimeout(fn, ms),
    clearTimeout: (id: unknown) => globalThis.clearTimeout(id as number),
    setInterval: (fn: () => void, ms: number) => globalThis.setInterval(fn, ms),
    clearInterval: (id: unknown) => globalThis.clearInterval(id as number),
  }
}

let scopeCounter = 0

interface Harness {
  loop: ReturnType<typeof useTaskProgressLoop<{ taskId?: number; status?: string }>>
  terminalCalls: Array<{ taskId: number; status: string }>
  errorCalls: unknown[]
  fetchCalls: () => number
}

async function makeLoop(impl: () => Promise<{ items: unknown[] }>): Promise<Harness> {
  const terminalCalls: Array<{ taskId: number; status: string }> = []
  const errorCalls: unknown[] = []
  let fetchCount = 0
  const loop = useTaskProgressLoop<{ taskId?: number; status?: string }>({
    scope: `net-err-${scopeCounter++}`,
    fetchProgress: async (ids) => {
      fetchCount += 1
      return impl()
    },
    extractTaskId: (d) => d?.taskId,
    extractStatus: (d) => d?.status,
    getIntervalMs: () => 60000,
    onTerminal: (taskId, _detail, status) => { terminalCalls.push({ taskId, status }) },
    onError: (e) => { errorCalls.push(e) },
  })
  loop.reset([1, 2])
  await new Promise<void>((r) => globalThis.setTimeout(r, 0))
  return { loop, terminalCalls, errorCalls, fetchCalls: () => fetchCount }
}

test('test_network_error_no_terminal', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  await h.loop.refreshOnce()
  await h.loop.refreshOnce()
  assert.equal(h.terminalCalls.length, 0, '网络错误不触发 onTerminal')
  h.loop.dispose()
})

test('test_network_error_no_status_change', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  await h.loop.refreshOnce()
  assert.deepEqual(h.loop.taskStatuses.value, {}, '网络错误不修改 taskStatuses')
  h.loop.dispose()
})

test('test_network_error_backoff_scheduled', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  // 首轮自动刷新失败后：不立刻重试（下一轮按 60s 正常间隔调度），
  // 短期内不应有新的 fetch 请求
  const before = h.fetchCalls()
  await new Promise<void>((r) => globalThis.setTimeout(r, 50))
  assert.equal(h.fetchCalls(), before, '失败后进入退避，不立即自动重试')
  h.loop.dispose()
})

test('test_network_error_on_error_called', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  assert.equal(h.errorCalls.length, 1, 'onError 被调用')
  assert.match((h.errorCalls[0] as Error).message, /network down/)
  h.loop.dispose()
})

test('test_network_recovery', async () => {
  setupWindow()
  let fail = true
  const h = await makeLoop(async () => {
    if (fail) throw new Error('network down')
    return { items: [{ taskId: 1, status: 'RUNNING' }] }
  })
  await h.loop.refreshOnce()
  fail = false
  await h.loop.refreshOnce()
  assert.equal(h.loop.taskStatuses.value[1], 'RUNNING', '恢复后继续轮询并落地状态')
  h.loop.dispose()
})

test('test_network_error_repeated', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  for (let i = 0; i < 5; i++) {
    await h.loop.refreshOnce()
  }
  assert.equal(h.errorCalls.length, 6, '多次失败仍退避上报')
  assert.equal(h.terminalCalls.length, 0)
  h.loop.dispose()
})

test('test_network_error_keeps_task', async () => {
  setupWindow()
  const h = await makeLoop(async () => { throw new Error('network down') })
  await h.loop.refreshOnce()
  assert.deepEqual(h.loop.taskIds.value, [1, 2], '任务不丢失')
  h.loop.dispose()
})

test('test_network_error_then_success', async () => {
  setupWindow()
  let fail = true
  const h = await makeLoop(async () => {
    if (fail) throw new Error('network down')
    return { items: [{ taskId: 1, status: 'SUCCESS' }] }
  })
  await h.loop.refreshOnce()
  assert.equal(h.terminalCalls.length, 0, '网络错误阶段无终态回调')
  fail = false
  await h.loop.refreshOnce()
  assert.equal(h.terminalCalls.length, 1, '恢复后成功响应正常触发终态')
  assert.equal(h.terminalCalls[0].taskId, 1)
  assert.equal(h.terminalCalls[0].status, 'SUCCESS')
  h.loop.dispose()
})