package main

import (
	"bytes"
	_ "embed"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
	"text/template"
	"time"

	"github.com/bmaupin/go-epub"
	"github.com/chromedp/chromedp"
)

const (
	MAX_TRUN_PAGE = 1000
)

var (
	//go:embed tpl/load_list_items.js
	loadListItemsJS string
	//go:embed tpl/load_content.js
	loadContentJS string

	currentResult = make(ResultItems, 0)
)

// renderJavascriptCoder
func renderJavascriptCoder(tpl string, sc *SpiderConfig) string {
	t, err := template.New("").Parse(tpl)
	if err != nil {
		log.Println("创建JS代码模板失败", err.Error())
		return ""
	}
	buf := new(bytes.Buffer)
	err = t.Execute(buf, sc)
	if err != nil {
		log.Println("执行JS代码模板失败", err.Error())
		return ""
	}
	return buf.String()
}

// RunSpider
func RunSpider(url string, listDealy int64, contentDelay int64, headless bool, showImage bool, proxyServe string, exit chan bool) {
	sc := MergeSpiderConfig(currentSpiderConfig, &SpiderConfig{Url: url})
	_, baseCancel, _, _, ctx, cancel := NewBrowser(headless, showImage, proxyServe)
	log.Println("1浏览器打开")
	app.pushMessage("debug_event", "1 浏览器打开")
	defer func() {
		cancel()
		baseCancel()
		log.Println("0浏览器已经销毁")
		app.pushMessage("debug_event", "0 浏览器已经销毁")
		close(exit)
	}()
	currentResult = make(ResultItems, 0, 0)
	chromedp.Run(ctx, chromedp.Tasks{
		chromedp.Navigate(sc.Url),
		chromedp.WaitReady("document.body", chromedp.ByJSPath),
		chromedp.Sleep(time.Duration(listDealy) * time.Millisecond),
	})
	app.pushMessage("debug_event", "2 页面已经打开")
	log.Println("2页面打开")
	listResult := make(ResultItems, 0)
	//TODO 2. 执行JS代码，获取列表页信息
	runJs := renderJavascriptCoder(loadListItemsJS, sc)
	err := chromedp.Run(ctx, chromedp.Tasks{
		chromedp.Evaluate(runJs, &listResult),
	})
	if err != nil {
		log.Println("执行JS代码失败", err.Error())
		app.pushMessage("debug_event", "2 执行JS代码失败")
		return
	}
	app.pushMessage("debug_event", "3 获取列表完成")
	log.Println("3获取列表完成")

	//TODO 3. 打开详情页 ,最多打开10条
	runJs = renderJavascriptCoder(loadContentJS, sc)
	for _, v := range listResult {
		select {
		case <-exit:
			return
		default:
			app.pushMessage("debug_event", fmt.Sprintf("4. %d- 待 下载详情页 %s ", v.No, v.Title))
			var result string = ""
			err = chromedp.Run(ctx, chromedp.Tasks{
				chromedp.Navigate(v.Href),
				chromedp.WaitReady(`document.body`, chromedp.ByJSPath),
				chromedp.Sleep(time.Duration(contentDelay) * time.Millisecond),
				chromedp.Evaluate(runJs, v),
			})
			if err != nil {
				log.Println("执行JS代码失败", err.Error())
			}
			//关闭当前TAB页
			chromedp.Run(ctx, chromedp.Tasks{
				chromedp.Evaluate(`var ret="";window.close();ret`, &result),
			})
			app.pushMessage("debug_event", fmt.Sprintf("4. %d- 下载详情页 %s 完成", v.No, v.Title))
			currentResult = append(currentResult, v)
		}
	}
	app.pushMessage("debug_event", "5 采集测试完成")
	log.Println("5采集测试完成")
}

// ExportEpubFile 导出epub文件
func ExportEpubFile(filepath string) {
	output := epub.NewEpub("")
	output.SetTitle(currentSpiderConfig.Site)
	output.SetAuthor("unknow")
	for i, art := range currentResult {
		body := "<h2>" + art.Title + "</h2><p>" + strings.Join(strings.Split(art.Content, "\n"), "</p><p>") + "</p>"
		output.AddSection(body, art.Title, fmt.Sprintf("%06d.xhtml", i+1), "")
	}
	fo, err := os.Create(filepath)
	if err != nil {
		app.pushMessage("debug_event", err.Error())
	}
	output.WriteTo(fo)
	fo.Close()
}

// CountYestodayArts 统计昨日信息发布量
func CountYestodayArts(url string, listDealy int64, trunPageDelay int64,
	headless bool, showImage bool, exit chan bool) (count int) {
	sc := MergeSpiderConfig(currentSpiderConfig, &SpiderConfig{Url: url})
	_, baseCancel, _, _, ctx, cancel := NewBrowser(headless, showImage, "")
	log.Println("1浏览器打开")
	app.pushMessage("debug_event", "1 浏览器打开")
	defer func() {
		cancel()
		baseCancel()
		log.Println("0浏览器已经销毁")
		app.pushMessage("debug_event", "0 浏览器已经销毁")
		app.pushMessage("debug_event", fmt.Sprintf("99 昨日信息发布量:%d ", count))
		close(exit)
	}()

	//时间比较
	now := time.Now()
	yesterday := now.AddDate(0, 0, -1) // 获取昨天的日期
	startOfYesterday := time.Date(yesterday.Year(), yesterday.Month(), yesterday.Day(), 0, 0, 0, 0, now.Location())
	endOfYesterday := startOfYesterday.AddDate(0, 0, 1).Add(-time.Nanosecond)

	//TODO 1.
	chromedp.Run(ctx, chromedp.Tasks{
		chromedp.Navigate(sc.Url),
		chromedp.WaitReady("document.body", chromedp.ByJSPath),
		chromedp.Sleep(time.Duration(listDealy) * time.Millisecond),
	})
	app.pushMessage("debug_event", "2 页面已经打开")
	log.Println("2页面打开")
	//TODO 2. 执行JS代码，获取列表页信息
	runJs := renderJavascriptCoder(loadListItemsJS, sc)
	tmp := map[string]bool{}
	//最多翻页1000页
	for i := 0; i < MAX_TRUN_PAGE; i++ {
		select {
		case <-exit:
			return
		default:
			app.pushMessage("debug_event", "3 执行列表页JS")
			listResult := make(ResultItems, 0)
			err := chromedp.Run(ctx, chromedp.Tasks{
				chromedp.Evaluate(runJs, &listResult),
			})
			if err != nil {
				log.Println("执行JS代码失败", err.Error())
				app.pushMessage("debug_event", "3 执行JS代码失败")
				return
			}
			//TODO 人工智能转换采集到的日期
			callAIState := false
			for j := 0; j < 5; j++ {
				app.pushMessage("debug_event", "3 执行AI提取列表发布时间"+strconv.Itoa(j+1))
				err := UpdateResultDateStr(listResult)
				if err == nil {
					callAIState = true
					break
				}
			}
			if !callAIState {
				app.pushMessage("debug_event", "3 多轮次调用AI均未得到合理结果")
				return
			}
			//TODO 日期统计
			for _, r := range listResult {
				day, err := time.Parse("2006-01-02", r.ListPubTime)
				if err != nil {
					continue
				}
				if _, ok := tmp[r.Href]; ok { //去重
					continue
				}
				if day.After(startOfYesterday) && day.Before(endOfYesterday) {
					count += 1
				} else if day.Before(startOfYesterday) {
					return
				}
			}
			app.pushMessage("debug_event", fmt.Sprintf("4 当前观测昨日信息发布量:%d ", count))
			//TODO 翻页
			//fmt.Println("下一页CSS选择器", currentSpiderConfig.ListNextPageCss)
			chromedp.Run(ctx, chromedp.Tasks{
				chromedp.Click(fmt.Sprintf(`document.querySelector("%s")`, currentSpiderConfig.ListNextPageCss),
					chromedp.ByJSPath),
				chromedp.Sleep(time.Duration(trunPageDelay) * time.Millisecond),
			})
		}
	}
	return
}