package vm

import (
	"container/list"
	"log"
	be "spider_creator/backend"
	"time"

	"github.com/chromedp/chromedp"
)

// VerifySpiderConfig 验证爬虫配置，支持翻页，列表项数据只提取2条
func (vm *VM) VerifySpiderConfig(sc *be.SpiderConfig) (*be.SpiderConfigVerifyResult, error) {
	verifyResult := list.New()
	ret := &be.SpiderConfigVerifyResult{true, true, true, true, true, true, true}
	_, baseCancelFn, _, _, ctx, incCancelFn := be.NewBrowser(false, false, "")    //列表页使用
	_, baseCancelFn2, _, _, ctx2, incCancelFn2 := be.NewBrowser(false, false, "") //详情页使用
	defer func() {
		incCancelFn2()
		baseCancelFn2()
		incCancelFn()
		baseCancelFn()
	}()

	listRunJs, contentRunJs := sc.ListJSCode, sc.ContentJSCode
	//TODO 2. 执行JS代码，获取列表页信息
	if listRunJs == "" {
		listRunJs = renderJavascriptCoder(loadListItemsJS, sc)
	}
	if contentRunJs == "" {
		contentRunJs = renderJavascriptCoder(loadContentJS, sc)
	}
	//TODO 3.打开列表，获取条目清单
	chromedp.Run(ctx, chromedp.Tasks{
		chromedp.Navigate(sc.Href),
		chromedp.WaitReady("document.body", chromedp.ByJSPath),
		//chromedp.Sleep(1000 * time.Millisecond),
		chromedp.Sleep(time.Duration(sc.ListDelayTime) * time.Millisecond),
	})
	no := 1
T:
	for j := 0; j < 2; j++ { //最多检查2页
		listResult := make(be.ResultItems, 0)
		err := chromedp.Run(ctx, chromedp.Tasks{
			chromedp.Evaluate(listRunJs, &listResult),
		})
		if err != nil {
			log.Println("执行JS代码失败", err.Error())
			continue
		}
		//TODO 5.操作详情页
		for contentIndex, r := range listResult {
			if contentIndex > 1 { //每页只采集2条
				break
			}
			//打开详情页
			err = chromedp.Run(ctx2, chromedp.Tasks{
				chromedp.Navigate(r.Href),
				chromedp.WaitReady("document.body", chromedp.ByJSPath),
				//chromedp.Sleep(1000 * time.Millisecond),
				chromedp.Sleep(time.Duration(sc.ContentDelayTime) * time.Millisecond),
			})
			if err != nil {
				continue
			}
			//获取详情页内容
			err = chromedp.Run(ctx2, chromedp.Tasks{
				chromedp.Evaluate(contentRunJs, r),
			})
			if err != nil {
				continue
			}
			if sc.AttachCss != "" {
				downloadAttaches(r, vm.attachesDir)
			}
			r.Site = sc.Site
			r.Channel = sc.Channel
			if r.Title == "" {
				r.Title = r.ListTitle
			}
			if r.PublishTime == "" {
				r.PublishTime = r.ListPubTime
			}
			r.No = no
			no += 1
			//结果放入缓存
			verifyResult.PushBack(r)
		}

		//TODO 6.翻页
		//if err = trunPage(sc, 2000, ctx); err != nil {
		if err = trunPage(sc, sc.ListTurnDelayTime, ctx); err != nil {
			ret.ListTrunPage = false
			break T
		}
	}
	//检查
	for el := verifyResult.Front(); el != nil; el = el.Next() {
		r, _ := el.Value.(*be.ResultItem)
		if ret.Title {
			ret.Title = r.Title != ""
		}
		if ret.PublishUnit {
			ret.PublishUnit = r.PublishUnit != ""
		}
		if ret.PublishTime {
			ret.PublishTime = r.PublishTime != ""
		}
		if ret.Content {
			ret.Content = r.Content != ""
		}
		if ret.Attaches {
			ret.Attaches = len(r.AttachLinks) > 0
		}
	}
	if ret.ListItems {
		ret.ListItems = verifyResult.Len() > 2
	}

	//TODO:每次验证结果存库、内存？
	return ret, nil
}