package mget

import (
	"b612.me/stario"
	"b612.me/starlog"
	"fmt"
	"github.com/spf13/cobra"
	"os"
	"os/signal"
	"regexp"
	"strconv"
	"strings"
	"time"
)

var mg Mget

var Cmd = &cobra.Command{
	Use:   "mget",
	Short: "多线程下载工具",
	Long:  `多线程下载工具`,
	Run:   Run,
}

var headers []string
var ua string
var proxy string
var skipVerify bool
var speedcontrol string

func init() {
	Cmd.Flags().StringVarP(&mg.Tareget, "output", "o", "", "输出文件名")
	Cmd.Flags().IntVarP(&mg.BufferSize, "buffer", "b", 8192, "缓冲区大小")
	Cmd.Flags().IntVarP(&mg.Thread, "thread", "t", 8, "线程数")
	Cmd.Flags().IntVarP(&mg.RedoRPO, "safe", "s", 1048576, "安全校验点")
	Cmd.Flags().StringSliceVarP(&headers, "header", "H", []string{}, "自定义请求头，格式： key=value")
	Cmd.Flags().StringVarP(&proxy, "proxy", "p", "", "代理地址")
	Cmd.Flags().StringVarP(&ua, "user-agent", "U", "", "自定义User-Agent")
	Cmd.Flags().BoolVarP(&skipVerify, "skip-verify", "k", false, "跳过SSL验证")
	Cmd.Flags().StringVarP(&speedcontrol, "speed", "S", "", "限速，如1M，意思是1MB/s")
}

func parseSpeedString(speedString string) (uint64, error) {
	// 定义单位及其对应的字节值
	unitMultipliers := map[string]int{
		"b": 1, "": 1,
		"k": 1024, "kb": 1024, "kib": 1024,
		"m": 1024 * 1024, "mb": 1024 * 1024, "mib": 1024 * 1024,
		"g": 1024 * 1024 * 1024, "gb": 1024 * 1024 * 1024, "gib": 1024 * 1024 * 1024,
		"t": 1024 * 1024 * 1024 * 1024, "tb": 1024 * 1024 * 1024 * 1024, "tib": 1024 * 1024 * 1024 * 1024,
	}

	// 正则表达式匹配速度的格式
	re := regexp.MustCompile(`(?i)^\s*([\d.]+)\s*(b|k|m|g|t|kb|mb|gb|tb|kib|mib|gib|tib)?\s*/?\s*s?\s*$`)
	matches := re.FindStringSubmatch(strings.ToLower(speedString))
	if matches == nil {
		return 0, fmt.Errorf("invalid speed string format")
	}

	// 解析数值部分
	value, err := strconv.ParseFloat(matches[1], 64)
	if err != nil {
		return 0, fmt.Errorf("invalid numeric value")
	}

	// 获取单位部分
	unit := matches[2]
	if unit == "" {
		unit = "b"
	}

	// 根据单位计算最终的字节每秒值
	multiplier, ok := unitMultipliers[unit]
	if !ok {
		return 0, fmt.Errorf("invalid unit in speed string")
	}

	return uint64(value * float64(multiplier)), nil
}

func Run(cmd *cobra.Command, args []string) {
	if args == nil || len(args) == 0 {
		starlog.Errorln("缺少URL参数")
		os.Exit(1)
	}
	if speedcontrol != "" {
		speed, err := parseSpeedString(speedcontrol)
		if err != nil {
			starlog.Criticalln("Speed Limit Error:", err)
			os.Exit(1)
		}
		mg.speedlimit = int64(speed)
		fmt.Printf("Max Speed Limit:(user in):\t%v\n", speedcontrol)
		fmt.Printf("Max Speed Limit (bytes/s):\t%v bytes/sec\n", speed)
	}
	for _, v := range headers {
		kv := strings.SplitN(v, "=", 2)
		if len(kv) != 2 {
			continue
		}
		mg.Setting.AddHeader(strings.TrimSpace(kv[0]), strings.TrimSpace(kv[1]))
	}
	if ua != "" {
		mg.Setting.SetUserAgent(ua)
	}
	if proxy != "" {
		mg.Setting.SetProxy(proxy)
	}
	if skipVerify {
		mg.Setting.SetSkipTLSVerify(true)
	}
	mg.OriginUri = args[0]
	sig := make(chan os.Signal)
	signal.Notify(sig, os.Interrupt)
	select {
	case err := <-stario.WaitUntilFinished(mg.Run):
		if err != nil {
			starlog.Errorln(err)
			os.Exit(2)
		}
		time.Sleep(time.Second)
		return
	case <-sig:
		starlog.Infoln("User Interrupted")
		mg.fn()
		time.Sleep(time.Second)
		mg.Redo.Save()
		os.Exit(3)
	}
}