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package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/gocolly/colly"
	"github.com/schollz/progressbar/v3"
)

var logger *log.Logger
var consoleLogger *log.Logger

func init() {
	// 初始化日志文件
	logFile, err := os.OpenFile("crawler.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
	if err != nil {
		fmt.Printf("无法创建日志文件: %v\n", err)
		os.Exit(1)
	}
	// 日志仅输出到文件
	logger = log.New(logFile, "", log.Ldate|log.Ltime|log.Lshortfile)
	// 终端日志
	consoleLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
}

func main() {
	// 获取 Cookie
	cookie, err := getCookie("http://res.cxxy.truraly.fun?login=zsxq:1145141919810")
	if err != nil {
		consoleLogger.Printf("获取 Cookie 失败: %v", err)
		os.Exit(1)
	}
	consoleLogger.Println("成功获取 Cookie")

	// 创建 Colly 收集器
	c := colly.NewCollector(
		colly.AllowedDomains("res.cxxy.truraly.fun"),
		colly.Async(true),
	)

	// 设置请求间隔
	c.Limit(&colly.LimitRule{
		DomainGlob:  "*",
		Parallelism: 2,
		Delay:       2 * time.Second,
	})

	// 设置请求头和 Cookie
	c.OnRequest(func(r *colly.Request) {
		r.Headers.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
		r.Headers.Set("Cookie", cookie)
		logger.Printf("正在访问: %s", r.URL.String())
	})

	// 仅记录响应到日志文件
	c.OnResponse(func(r *colly.Response) {
		logger.Printf("响应状态码: %d", r.StatusCode)
		logger.Printf("响应内容: %s", string(r.Body))
	})

	// 检查页面是否加载成功
	c.OnHTML("html", func(e *colly.HTMLElement) {
		logger.Printf("成功解析页面: %s", e.Request.URL.String())
	})

	// 处理文件夹
	c.OnHTML("a[href*='/?get=basic']", func(e *colly.HTMLElement) {
		link := e.Request.AbsoluteURL(e.Attr("href"))
		name, err := url.QueryUnescape(e.Text)
		if err != nil {
			logger.Printf("解码文件夹名称失败: %v", err)
			return
		}
		if name == ".." || strings.Contains(link, "get=logout") {
			logger.Printf("忽略链接: %s %s", name, link)
			return
		}
		logger.Printf("发现文件夹: %s URL: %s", name, link)

		// 创建本地文件夹
		localPath := filepath.Join("downloads", strings.ReplaceAll(strings.Split(link, "?get=basic")[0], "http://res.cxxy.truraly.fun/", ""))
		err = os.MkdirAll(localPath, 0755)
		if err != nil {
			logger.Printf("创建文件夹失败: %v", err)
			return
		}
		// 递归访问文件夹
		visitURL := link
		if !strings.Contains(visitURL, "?get=basic") {
			visitURL = link + "?get=basic"
		}
		err = c.Visit(visitURL)
		if err != nil {
			logger.Printf("访问文件夹失败: %v", err)
		}
	})

	// 处理文件
	c.OnHTML("a[href]", func(e *colly.HTMLElement) {
		link := e.Request.AbsoluteURL(e.Attr("href"))
		name, err := url.QueryUnescape(e.Text)
		if err != nil {
			logger.Printf("解码文件名称失败: %v", err)
			return
		}
		if strings.Contains(link, "get=login") || strings.Contains(link, "get=logout") || strings.Contains(link, "?get=basic") {
			return
		}
		if isFile(link) {
			logger.Printf("发现文件: %s URL: %s", name, link)
			localPath := filepath.Join("downloads", strings.ReplaceAll(e.Request.URL.Path, "/", string(os.PathSeparator)))
			localFilePath := filepath.Join(localPath, name)
			if _, err := os.Stat(localFilePath); !os.IsNotExist(err) {
				consoleLogger.Printf("文件已存在，跳过: %s", localFilePath)
				return
			}
			err = os.MkdirAll(filepath.Dir(localFilePath), 0755)
			if err != nil {
				logger.Printf("创建文件目录失败: %v", err)
				return
			}
			consoleLogger.Printf("开始下载: %s", name)
			err = downloadFile(link, localFilePath, cookie)
			if err != nil {
				consoleLogger.Printf("下载失败: %s, 错误: %v", name, err)
			} else {
				consoleLogger.Printf("文件已保存: %s", localFilePath)
			}
		}
	})

	// 错误处理
	c.OnError(func(r *colly.Response, err error) {
		logger.Printf("请求失败: %s, 状态码: %d, 错误: %v", r.Request.URL, r.StatusCode, err)
		logger.Printf("响应内容: %s", string(r.Body))
	})

	// 开始爬取
	consoleLogger.Println("开始爬取...")
	err = c.Visit("http://res.cxxy.truraly.fun/%E6%88%90%E8%B4%A4%E6%9C%9F%E6%9C%AB%E5%A4%8D%E4%B9%A0%E8%B5%84%E6%96%99/?get=basic")
	if err != nil {
		consoleLogger.Printf("初始请求失败: %v", err)
	}

	c.Wait()
	consoleLogger.Println("爬取完成")
}

// 获取 Cookie
func getCookie(loginURL string) (string, error) {
	client := &http.Client{
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			return http.ErrUseLastResponse // 阻止自动重定向以获取 Cookie
		},
	}
	req, err := http.NewRequest("GET", loginURL, nil)
	if err != nil {
		return "", fmt.Errorf("创建登录请求失败: %v", err)
	}
	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")

	resp, err := client.Do(req)
	if err != nil {
		return "", fmt.Errorf("登录请求失败: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusFound {
		return "", fmt.Errorf("登录失败，状态码: %d", resp.StatusCode)
	}

	cookies := resp.Header["Set-Cookie"]
	if len(cookies) == 0 {
		return "", fmt.Errorf("未找到 Cookie")
	}

	return strings.Join(cookies, "; "), nil
}

// 判断是否为文件
func isFile(url string) bool {
	extensions := []string{".pdf", ".jpg", ".png", ".zip", ".doc", ".docx", ".xls", ".xlsx", ".ppt", ".pptx", ".txt", ".mp4", ".mp3", ".rar", ".7z"}
	for _, ext := range extensions {
		if strings.HasSuffix(strings.ToLower(url), ext) {
			return true
		}
	}
	return false
}

// 下载文件（带进度条和重试机制）
func downloadFile(url, localPath, cookie string) error {
	const maxRetries = 3
	for attempt := 1; attempt <= maxRetries; attempt++ {
		client := &http.Client{}
		req, err := http.NewRequest("GET", url, nil)
		if err != nil {
			return fmt.Errorf("创建请求失败: %v", err)
		}
		req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
		req.Header.Set("Cookie", cookie)

		resp, err := client.Do(req)
		if err != nil {
			logger.Printf("下载尝试 %d/%d 失败: %v", attempt, maxRetries, err)
			if attempt == maxRetries {
				return fmt.Errorf("发送请求失败: %v", err)
			}
			time.Sleep(time.Second * time.Duration(attempt))
			continue
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			logger.Printf("下载尝试 %d/%d 失败，状态码: %d", attempt, maxRetries, resp.StatusCode)
			if attempt == maxRetries {
				return fmt.Errorf("下载失败，状态码: %d", resp.StatusCode)
			}
			time.Sleep(time.Second * time.Duration(attempt))
			continue
		}

		// 创建文件
		out, err := os.Create(localPath)
		if err != nil {
			return fmt.Errorf("创建文件失败: %v", err)
		}
		defer out.Close()

		// 创建进度条
		bar := progressbar.NewOptions64(
			resp.ContentLength,
			progressbar.OptionSetDescription(filepath.Base(localPath)),
			progressbar.OptionSetWidth(30),
			progressbar.OptionShowBytes(true),
			progressbar.OptionSetTheme(progressbar.Theme{
				Saucer:        "=",
				SaucerHead:    ">",
				SaucerPadding: " ",
				BarStart:      "[",
				BarEnd:        "]",
			}),
		)

		// 使用 io.TeeReader 将读取数据同时写入文件和更新进度条
		_, err = io.Copy(out, io.TeeReader(resp.Body, bar))
		if err != nil {
			logger.Printf("下载尝试 %d/%d 失败: %v", attempt, maxRetries, err)
			if attempt == maxRetries {
				return fmt.Errorf("写入文件失败: %v", err)
			}
			time.Sleep(time.Second * time.Duration(attempt))
			continue
		}
		return nil
	}
	return nil
}