import { effectScope, nextTick, ref } from 'vue'
import { afterEach, describe, expect, it, vi } from 'vitest'
import { usePolling } from '@/composables/usePolling'

afterEach(() => vi.useRealTimers())

describe('异步轮询生命周期', () => {
    it('关闭定时刷新后仍支持首次读取、手动刷新及查询目标切换', async () => {
        vi.useFakeTimers()
        const key = ref('first')
        const loader = vi.fn<(id: string) => Promise<string>>(async id => id)
        const scope = effectScope()
        const query = scope.run(() => usePolling(key, loader, false))!
        await Promise.resolve()
        expect(query.data.value).toBe('first')
        await vi.advanceTimersByTimeAsync(30_000)
        expect(loader).toHaveBeenCalledTimes(1)
        await query.refresh()
        expect(loader).toHaveBeenCalledTimes(2)
        key.value = 'second'
        await nextTick()
        await Promise.resolve()
        expect(query.data.value).toBe('second')
        await vi.advanceTimersByTimeAsync(30_000)
        expect(loader).toHaveBeenCalledTimes(3)
        scope.stop()
    })

    it('响应式暂停清除旧定时器，恢复只创建一个轮询链', async () => {
        vi.useFakeTimers()
        const interval = ref<number | false>(1000)
        const loader = vi.fn<() => Promise<string>>(async () => '数据')
        const scope = effectScope()
        scope.run(() => usePolling(ref('p'), loader, interval))
        await Promise.resolve()
        interval.value = false
        await nextTick()
        await vi.advanceTimersByTimeAsync(5000)
        expect(loader).toHaveBeenCalledTimes(1)
        interval.value = 1000
        await nextTick()
        await vi.advanceTimersByTimeAsync(2000)
        expect(loader).toHaveBeenCalledTimes(3)
        scope.stop()
        await vi.advanceTimersByTimeAsync(5000)
        expect(loader).toHaveBeenCalledTimes(3)
    })

    it('切换项目忽略旧响应，卸载时不再排队请求', async () => {
        vi.useFakeTimers()
        const key = ref('first')
        const finish = new Map<string, (value: string) => void>()
        const loader = vi.fn<(id: string) => Promise<string>>(
            (id: string) =>
                new Promise<string>(resolve => {
                    finish.set(id, resolve)
                })
        )
        const scope = effectScope()
        const query = scope.run(() => usePolling(key, loader, 1000))!
        key.value = 'second'
        await nextTick()
        finish.get('second')!('新项目')
        await Promise.resolve()
        finish.get('first')!('旧项目')
        await Promise.resolve()
        expect(query.data.value).toBe('新项目')
        scope.stop()
        await vi.advanceTimersByTimeAsync(10_000)
        expect(loader).toHaveBeenCalledTimes(2)
    })

    it('失败时保留已有数据，并向页面显示错误', async () => {
        const scope = effectScope()
        const loader = vi
            .fn<() => Promise<string>>()
            .mockResolvedValueOnce('上次成功数据')
            .mockRejectedValueOnce(new Error('连接已断开'))
        const query = scope.run(() => usePolling(ref('p'), loader))!
        await Promise.resolve()
        await query.refresh()
        expect(query.data.value).toBe('上次成功数据')
        expect(query.error.value).toBe('连接已断开')
        scope.stop()
    })
})