package uploader

import (
	"bufio"
	"context"
	"dypid-client/api"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"github.com/spf13/viper"
	"golang.org/x/sync/errgroup"
)

var httpClient = &http.Client{
	Transport: &http.Transport{
		MaxIdleConns:        200,
		MaxIdleConnsPerHost: 100,
		IdleConnTimeout:     30 * time.Second,
	},
	Timeout: 30 * time.Second,
}

type Task struct {
	FilePath  string
	FileLines int
}

func StartLooking(lookingPath string) {
	//检测./
	fmt.Println("程序启动成功，正在检测txt文件")
	for {
		files, err := getTxtFiles("./")
		if err != nil {
			fmt.Println(err)
			continue
		}
		if files != nil {
			start := time.Now()

			fileLines := make(map[string]int)
			fmt.Println("正在统计", len(files), "个文件行数")
			for _, filePath := range files {
				file, err := os.Open(filePath)
				if err != nil {
					fmt.Println("打开文件失败：", err)
				}
				// 使用 bufio.Scanner 逐行读取
				scanner := bufio.NewScanner(file)
				lineCount := 0
				for scanner.Scan() {
					lineCount++
				}
				file.Close()
				if lineCount == 0 {
					continue
				}
				fileLines[filepath.Base(filePath)] = lineCount
				fmt.Println(filepath.Base(filePath), "文件行数：", lineCount)

			}

			var tasks []Task
			for k, v := range fileLines {
				tasks = append(tasks, Task{FilePath: k, FileLines: v})
			}

			// 使用errgroup控制并发
			g, ctx := errgroup.WithContext(context.Background())
			g.SetLimit(50) // 设置最大并发数为50
			// 执行所有任务
			for _, task := range tasks {
				task := task // 创建局部变量
				g.Go(func() error {
					select {
					case <-ctx.Done():
						return ctx.Err()
					default:
						fmt.Println("正在上传文件:", filepath.Base(task.FilePath))
						processFile(task.FilePath, task.FileLines)
						err := os.Truncate(task.FilePath, 0)
						if err != nil {
							fmt.Println("清空文件失败：", err)
						}
						return nil
					}
				})
			}

			// 等待所有任务完成
			if err := g.Wait(); err != nil {
				fmt.Printf("任务执行出错: %v\n", err)
			} else {
				fmt.Println("所有任务执行完成！")
			}

			fmt.Printf("上传完成，耗时：%s\n", time.Since(start))
		}
		time.Sleep(time.Minute)
	}
}

// 获取目录中的所有txt文件
func getTxtFiles(dir string) (txtFiles []string, err error) {
	err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// 只处理普通文件，跳过目录
		if !info.Mode().IsRegular() {
			return nil
		}

		// 检查文件扩展名是否为.txt
		if strings.ToLower(filepath.Ext(path)) == ".txt" {
			txtFiles = append(txtFiles, path)
		}

		return nil
	})

	return txtFiles, err
}

func processFile(filePath string, fileLines int) {
	var wg sync.WaitGroup
	// 打开文件
	file, err := os.Open(filePath)
	if err != nil {
		fmt.Printf("无法打开文件 %s: %v\n", filePath, err)
		return
	}
	defer file.Close()

	// 创建行通道
	lines := make(chan string, 100)

	// 创建10个worker处理文件上传
	for i := 0; i < viper.GetInt("thread-count"); i++ {
		wg.Add(1)
		go func(workerID int) {
			defer wg.Done()
			processLines(lines, workerID, filePath)
		}(i)
	}

	// 读取文件并发送到通道
	scanner := bufio.NewScanner(file)
	lineCount := 0
	for scanner.Scan() {
		lines <- scanner.Text()
		lineCount++
		if lineCount%10000 == 0 {
			fmt.Printf("文件【%s】处理进度：%.2f%%\n", filePath, float64(lineCount)/float64(fileLines)*100)
		}
	}

	close(lines)
	wg.Wait()

	if err := scanner.Err(); err != nil {
		fmt.Printf("读取文件 %s 错误: %v\n", filePath, err)
		return
	}

	fmt.Printf("文件【%s】处理完成，共处理 %d 行数据\n", filePath, lineCount)
}

func processLines(lines <-chan string, workerID int, filePath string) {
	for line := range lines {
		// 跳过空行
		if strings.TrimSpace(line) == "" {
			continue
		}
		// 上传数据
		if err := api.UploadDataToServer(httpClient, line); err != nil {
			fmt.Printf("Worker %d (文件 %s): 上传失败: %v\n", workerID, filePath, err)
		}
	}
}